6.项目架构搭建之Core搭建

添加对用到的类库的引用，这里用到的包括：.NET自带的两个类库System.Configuration 、 System.Web ，和两个第三方类库 log4net（日志框架）和 Newtonsoft.Json (Json.Net)

ConfigurationHelper 【配置文件帮助类】

  1     /// <summary>
  2 
  3        /// 网站根路径
  4 
  5        /// </summary>
  6 
  7        private static string siteroot = System.Web.Hosting.HostingEnvironment.MapPath("~/");
  8 
  9  
 10 
 11        /// <summary>
 12 
 13        /// 获取配置文件中AppSetting节点的相对路径对应的绝对路径
 14 
 15        /// </summary>
 16 
 17        /// <param name="key">相对路径设置的键值</param>
 18 
 19        /// <returns>绝对路径</returns>
 20 
 21        public static string AppSettingMapPath(string key)
 22 
 23        {
 24 
 25            if (String.IsNullOrEmpty(siteroot))
 26 
 27            {
 28 
 29                siteroot = System.Web.Hosting.HostingEnvironment.MapPath("~/");
 30 
 31            }
 32 
 33            //拼接路径
 34 
 35            string path = siteroot + System.Configuration.ConfigurationManager.AppSettings[key].ToString();
 36 
 37            return path;
 38 
 39        }
 40 
 41  
 42 
 43        /// <summary>
 44 
 45        /// 将虚拟路径转换为物理路径
 46 
 47        /// </summary>
 48 
 49        /// <param name="virtualPath">虚拟路径</param>
 50 
 51        /// <returns>虚拟路径对应的物理路径</returns>
 52 
 53        public static string MapPath(string virtualPath)
 54 
 55        {
 56 
 57            if (String.IsNullOrEmpty(siteroot))
 58 
 59            {
 60 
 61                siteroot = System.Web.Hosting.HostingEnvironment.MapPath("~/");
 62 
 63            }
 64 
 65            //拼接路径
 66 
 67            string path = siteroot + virtualPath;
 68 
 69            return path;
 70 
 71        }
 72 
 73  
 74 
 75        /// <summary>
 76 
 77        /// 获取配置文件中AppSetting节点的值
 78 
 79        /// </summary>
 80 
 81        /// <param name="key">设置的键值</param>
 82 
 83        /// <returns>键值对应的值</returns>
 84 
 85        public static string AppSetting(string key) => System.Configuration.ConfigurationManager.AppSettings[key].ToString();
 86 
 87  
 88 
 89        /// <summary>
 90 
 91        /// 获取配置文件中ConnectionStrings节点的值
 92 
 93        /// </summary>
 94 
 95        /// <param name="key">键值</param>
 96 
 97        /// <returns>键值对应的连接字符串值</returns>
 98 
 99        public static string ConnectionString(string key) => System.Configuration.ConfigurationManager.ConnectionStrings[key].ConnectionString;
100 
101  
102 
103        public static bool UpdateAppSettings(string key, string value)
104 
105        {
106 
107            string filename = System.Web.Hosting.HostingEnvironment.MapPath("~/web.config");
108 
109            XmlDocument xmldoc = new XmlDocument();
110 
111            try
112 
113            {
114 
115                xmldoc.Load(filename);
116 
117            }
118 
119            catch (Exception)
120 
121            {
122 
123                return false;
124 
125            }
126 
127            XmlNodeList DocdNodeNameArr = xmldoc.DocumentElement.ChildNodes;//文档节点名称数组
128 
129            foreach (XmlElement element in DocdNodeNameArr)
130 
131            {
132 
133                if (element.Name == "appSettings")//找到名称为 appSettings 的节点
134 
135                {
136 
137                    XmlNodeList KeyNameArr = element.ChildNodes;//子节点名称数组
138 
139                    if (KeyNameArr.Count > 0)
140 
141                    {
142 
143                        foreach (XmlElement xmlElement in KeyNameArr)
144 
145                        {
146 
147                            //找到键值，修改为想要修改的值
148 
149                            if (xmlElement.Attributes["key"].InnerXml.Equals(key))
150 
151                            {
152 
153                                xmlElement.Attributes["value"].Value = value;
154 
155                                ConfigurationManager.RefreshSection("appSettings");
156 
157                                return true;
158 
159                            }
160 
161                        }
162 
163                        //没有相应的节点
164 
165                        return false;
166 
167                    }
168 
169                    else
170 
171                    {
172 
173                        //不存在 AppSettings 节点
174 
175                        return false;
176 
177                    }
178 
179                }
180 
181            }
182 
183            return false;
184 
185        }
186 
187

PathHelper 【路径帮助类】

通过 System.Web.Hosting.HostingEnvironment.MapPath() 方法将虚拟路径转换为物理路径

1 /// <summary>
2 /// 将虚拟路径转换为物理路径
3 /// </summary>
4 /// <param name="virtualPath">虚拟路径</param>
5 /// <returns>虚拟路径对应的物理路径</returns>
6 public static string MapPath(string virtualPath) => System.Web.Hosting.HostingEnvironment.MapPath("~/") + virtualPath;

LogHelper 【日志帮助类】

根据log4net中的ILog接口中的方法进行封装，在构造函数中设置logger，在程序启动时需要进行log4net的初始化，只初始化一次就可以了所以需要设置为static 静态方法

/// <summary>
   /// 日志助手
   /// </summary>
   public class LogHelper
   {
       private readonly ILog logger = null;
 

       public LogHelper(Type t)
       {
           logger = LogManager.GetLogger(t);
       }
 

       public LogHelper(string name)
       {
           logger = LogManager.GetLogger(name);
       }
 

       public static void LogInit()
       {
           log4net.Config.XmlConfigurator.Configure();
       }
 

       public void Debug(string msg)
       {
           logger.Debug(msg);
       }
 

       public void Debug(string msg, Exception ex)
       {
           logger.Debug(msg, ex);
       }
 

       public void Error(string msg)
       {
           logger.Error(msg);
       }
 

       public void Error(string msg, Exception ex)
       {
           logger.Error(msg, ex);
       }
 

       public void Warn(string msg)
       {
           logger.Warn(msg);
       }
 

       public void Warn(string msg, Exception ex)
       {
           logger.Warn(msg, ex);
       }
 

       public void Debug(Exception ex)
       {
           logger.Debug(ex.Message, ex);
       }
 

       public void Error(Exception ex)
       {
           logger.Error(ex.Message, ex);
       }
   }

WebHelper 【Web帮助类】

包括Web编码解码：html编码解码、url编码解码，Cookies管理，获取客户端信息（IP，浏览器类型、操作系统等信息）

 1 #region 编码
 2 
 3         /// <summary>
 4         /// HTML解码
 5         /// </summary>
 6         /// <returns></returns>
 7         public static string HtmlDecode(string s)
 8         {
 9             return HttpUtility.HtmlDecode(s);
10         }
11 
12         /// <summary>
13         /// HTML编码
14         /// </summary>
15         /// <returns></returns>
16         public static string HtmlEncode(string s)
17         {
18             return HttpUtility.HtmlEncode(s);
19         }
20 
21         /// <summary>
22         /// URL解码
23         /// </summary>
24         /// <returns></returns>
25         public static string UrlDecode(string s)
26         {
27             return HttpUtility.UrlDecode(s);
28         }
29 
30         /// <summary>
31         /// URL编码
32         /// </summary>
33         /// <returns></returns>
34         public static string UrlEncode(string s)
35         {
36             return HttpUtility.UrlEncode(s);
37         }
38 
39         #endregion 编码

  1 #region Cookie
  2 
  3         /// <summary>
  4         /// 删除指定名称的Cookie
  5         /// </summary>
  6         /// <param name="name">Cookie名称</param>
  7         public static void DeleteCookie(string name)
  8         {
  9             HttpCookie cookie = new HttpCookie(name);
 10             cookie.Expires = DateTime.Now.AddYears(-1);
 11             HttpContext.Current.Response.AppendCookie(cookie);
 12         }
 13 
 14         /// <summary>
 15         /// 获得指定名称的Cookie值
 16         /// </summary>
 17         /// <param name="name">Cookie名称</param>
 18         /// <returns></returns>
 19         public static string GetCookie(string name)
 20         {
 21             HttpCookie cookie = HttpContext.Current.Request.Cookies[name];
 22             if (cookie != null)
 23                 return cookie.Value;
 24 
 25             return string.Empty;
 26         }
 27 
 28         /// <summary>
 29         /// 获得指定名称的Cookie中特定键的值
 30         /// </summary>
 31         /// <param name="name">Cookie名称</param>
 32         /// <param name="key">键</param>
 33         /// <returns></returns>
 34         public static string GetCookie(string name, string key)
 35         {
 36             HttpCookie cookie = HttpContext.Current.Request.Cookies[name];
 37             if (cookie != null && cookie.HasKeys)
 38             {
 39                 string v = cookie[key];
 40                 if (v != null)
 41                     return v;
 42             }
 43 
 44             return string.Empty;
 45         }
 46 
 47         /// <summary>
 48         /// 设置指定名称的Cookie的值
 49         /// </summary>
 50         /// <param name="name">Cookie名称</param>
 51         /// <param name="value">值</param>
 52         public static void SetCookie(string name, string value)
 53         {
 54             HttpCookie cookie = HttpContext.Current.Request.Cookies[name];
 55             if (cookie != null)
 56                 cookie.Value = value;
 57             else
 58                 cookie = new HttpCookie(name, value);
 59 
 60             HttpContext.Current.Response.AppendCookie(cookie);
 61         }
 62 
 63         /// <summary>
 64         /// 设置指定名称的Cookie的值
 65         /// </summary>
 66         /// <param name="name">Cookie名称</param>
 67         /// <param name="value">值</param>
 68         /// <param name="expires">过期时间</param>
 69         public static void SetCookie(string name, string value, double expires)
 70         {
 71             HttpCookie cookie = HttpContext.Current.Request.Cookies[name];
 72             if (cookie == null)
 73                 cookie = new HttpCookie(name);
 74 
 75             cookie.Value = value;
 76             cookie.Expires = DateTime.Now.AddMinutes(expires);
 77             HttpContext.Current.Response.AppendCookie(cookie);
 78         }
 79 
 80         /// <summary>
 81         /// 设置指定名称的Cookie特定键的值
 82         /// </summary>
 83         /// <param name="name">Cookie名称</param>
 84         /// <param name="key">键</param>
 85         /// <param name="value">值</param>
 86         public static void SetCookie(string name, string key, string value)
 87         {
 88             HttpCookie cookie = HttpContext.Current.Request.Cookies[name];
 89             if (cookie == null)
 90                 cookie = new HttpCookie(name);
 91 
 92             cookie[key] = value;
 93             HttpContext.Current.Response.AppendCookie(cookie);
 94         }
 95 
 96         /// <summary>
 97         /// 设置指定名称的Cookie特定键的值
 98         /// </summary>
 99         /// <param name="name">Cookie名称</param>
100         /// <param name="key">键</param>
101         /// <param name="value">值</param>
102         /// <param name="expires">过期时间</param>
103         public static void SetCookie(string name, string key, string value, double expires)
104         {
105             HttpCookie cookie = HttpContext.Current.Request.Cookies[name];
106             if (cookie == null)
107                 cookie = new HttpCookie(name);
108 
109             cookie[key] = value;
110             cookie.Expires = DateTime.Now.AddMinutes(expires);
111             HttpContext.Current.Response.AppendCookie(cookie);
112         }
113 
114         #endregion Cookie

  1         //浏览器列表
  2         private static string[] _browserlist = new string[] { "ie", "chrome", "mozilla", "netscape", "firefox", "opera", "konqueror" };
  3 
  4 #region 客户端信息
  5 
  6         /// <summary>
  7         /// 是否是get请求
  8         /// </summary>
  9         /// <returns></returns>
 10         public static bool IsGet()
 11         {
 12             return HttpContext.Current.Request.HttpMethod == "GET";
 13         }
 14 
 15         /// <summary>
 16         /// 是否是post请求
 17         /// </summary>
 18         /// <returns></returns>
 19         public static bool IsPost()
 20         {
 21             return HttpContext.Current.Request.HttpMethod == "POST";
 22         }
 23 
 24         /// <summary>
 25         /// 是否是Ajax请求
 26         /// </summary>
 27         /// <returns></returns>
 28         public static bool IsAjax()
 29         {
 30             return HttpContext.Current.Request.Headers["X-Requested-With"] == "XMLHttpRequest";
 31         }
 32 
 33         /// <summary>
 34         /// 获得查询字符串中的值
 35         /// </summary>
 36         /// <param name="key">键</param>
 37         /// <param name="defaultValue">默认值</param>
 38         /// <returns></returns>
 39         public static string GetQueryString(string key, string defaultValue)
 40         {
 41             string value = HttpContext.Current.Request.QueryString[key];
 42             if (!string.IsNullOrWhiteSpace(value))
 43                 return value;
 44             else
 45                 return defaultValue;
 46         }
 47 
 48         /// <summary>
 49         /// 获得查询字符串中的值
 50         /// </summary>
 51         /// <param name="key">键</param>
 52         /// <returns></returns>
 53         public static string GetQueryString(string key)
 54         {
 55             return GetQueryString(key, "");
 56         }
 57 
 58         /// <summary>
 59         /// 获得查询字符串中的值
 60         /// </summary>
 61         /// <param name="key">键</param>
 62         /// <param name="defaultValue">默认值</param>
 63         /// <returns></returns>
 64         public static int GetQueryInt(string key, int defaultValue)
 65         {
 66             return ConverterHelper.StringToInt(HttpContext.Current.Request.QueryString[key], defaultValue);
 67         }
 68 
 69         /// <summary>
 70         /// 获得查询字符串中的值
 71         /// </summary>
 72         /// <param name="key">键</param>
 73         /// <returns></returns>
 74         public static int GetQueryInt(string key)
 75         {
 76             return GetQueryInt(key, 0);
 77         }
 78 
 79         /// <summary>
 80         /// 获得表单中的值
 81         /// </summary>
 82         /// <param name="key">键</param>
 83         /// <param name="defaultValue">默认值</param>
 84         /// <returns></returns>
 85         public static string GetFormString(string key, string defaultValue)
 86         {
 87             string value = HttpContext.Current.Request.Form[key];
 88             if (!string.IsNullOrWhiteSpace(value))
 89                 return value;
 90             else
 91                 return defaultValue;
 92         }
 93 
 94         /// <summary>
 95         /// 获得表单中的值
 96         /// </summary>
 97         /// <param name="key">键</param>
 98         /// <returns></returns>
 99         public static string GetFormString(string key)
100         {
101             return GetFormString(key, "");
102         }
103 
104         /// <summary>
105         /// 获得表单中的值
106         /// </summary>
107         /// <param name="key">键</param>
108         /// <param name="defaultValue">默认值</param>
109         /// <returns></returns>
110         public static int GetFormInt(string key, int defaultValue)
111         {
112             return ConverterHelper.StringToInt(HttpContext.Current.Request.Form[key], defaultValue);
113         }
114 
115         /// <summary>
116         /// 获得表单中的值
117         /// </summary>
118         /// <param name="key">键</param>
119         /// <returns></returns>
120         public static int GetFormInt(string key)
121         {
122             return GetFormInt(key, 0);
123         }
124 
125         /// <summary>
126         /// 获得请求中的值
127         /// </summary>
128         /// <param name="key">键</param>
129         /// <param name="defaultValue">默认值</param>
130         /// <returns></returns>
131         public static string GetRequestString(string key, string defaultValue)
132         {
133             if (HttpContext.Current.Request.Form[key] != null)
134                 return GetFormString(key, defaultValue);
135             else
136                 return GetQueryString(key, defaultValue);
137         }
138 
139         /// <summary>
140         /// 获得请求中的值
141         /// </summary>
142         /// <param name="key">键</param>
143         /// <returns></returns>
144         public static string GetRequestString(string key)
145         {
146             if (HttpContext.Current.Request.Form[key] != null)
147                 return GetFormString(key);
148             else
149                 return GetQueryString(key);
150         }
151 
152         /// <summary>
153         /// 获得请求中的值
154         /// </summary>
155         /// <param name="key">键</param>
156         /// <param name="defaultValue">默认值</param>
157         /// <returns></returns>
158         public static int GetRequestInt(string key, int defaultValue)
159         {
160             if (HttpContext.Current.Request.Form[key] != null)
161                 return GetFormInt(key, defaultValue);
162             else
163                 return GetQueryInt(key, defaultValue);
164         }
165 
166         /// <summary>
167         /// 获得请求中的值
168         /// </summary>
169         /// <param name="key">键</param>
170         /// <returns></returns>
171         public static int GetRequestInt(string key)
172         {
173             if (HttpContext.Current.Request.Form[key] != null)
174                 return GetFormInt(key);
175             else
176                 return GetQueryInt(key);
177         }
178 
179         /// <summary>
180         /// 获得上次请求的url
181         /// </summary>
182         /// <returns></returns>
183         public static string GetUrlReferrer()
184         {
185             Uri uri = HttpContext.Current.Request.UrlReferrer;
186             if (uri == null)
187             {
188                 return string.Empty;
189             }
190             return uri.ToString();
191         }
192 
193         /// <summary>
194         /// 获得请求的主机部分
195         /// </summary>
196         /// <returns></returns>
197         public static string GetHost()
198         {
199             return HttpContext.Current.Request.Url.Host;
200         }
201 
202         /// <summary>
203         /// 获得请求的url
204         /// </summary>
205         /// <returns></returns>
206         public static string GetUrl()
207         {
208             return HttpContext.Current.Request.Url.ToString();
209         }
210 
211         /// <summary>
212         /// 获得请求的原始url
213         /// </summary>
214         /// <returns></returns>
215         public static string GetRawUrl()
216         {
217             return HttpContext.Current.Request.RawUrl;
218         }
219 
220         /// <summary>
221         /// 获得请求的ip
222         /// </summary>
223         /// <returns></returns>
224         public static string GetIP()
225         {
226             string ip = string.Empty;
227             if (HttpContext.Current.Request.ServerVariables["HTTP_VIA"] != null)
228                 ip = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
229             else
230                 ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
231 
232             if (string.IsNullOrEmpty(ip) || !ValidateHelper.IsIP(ip))
233                 ip = "127.0.0.1";
234             return ip;
235         }
236 
237         /// <summary>
238         /// 获得请求的浏览器类型
239         /// </summary>
240         /// <returns></returns>
241         public static string GetBrowserType()
242         {
243             string type = HttpContext.Current.Request.Browser.Type;
244             if (string.IsNullOrEmpty(type) || type == "unknown")
245                 return "未知";
246 
247             return type.ToLower();
248         }
249 
250         /// <summary>
251         /// 获得请求的浏览器名称
252         /// </summary>
253         /// <returns></returns>
254         public static string GetBrowserName()
255         {
256             string name = HttpContext.Current.Request.Browser.Browser;
257             if (string.IsNullOrEmpty(name) || name == "unknown")
258                 return "未知";
259 
260             return name.ToLower();
261         }
262 
263         /// <summary>
264         /// 获得请求的浏览器版本
265         /// </summary>
266         /// <returns></returns>
267         public static string GetBrowserVersion()
268         {
269             string version = HttpContext.Current.Request.Browser.Version;
270             if (string.IsNullOrEmpty(version) || version == "unknown")
271                 return "未知";
272 
273             return version;
274         }
275 
276         /// <summary>
277         /// 获得请求客户端的操作系统类型
278         /// </summary>
279         /// <returns></returns>
280         public static string GetOSType()
281         {
282             string userAgent = HttpContext.Current.Request.UserAgent;
283             if (userAgent == null)
284                 return "未知";
285 
286             string type = null;
287             if (userAgent.Contains("NT 6.1"))
288                 type = "Windows 7";
289             else if (userAgent.Contains("NT 5.1"))
290                 type = "Windows XP";
291             else if (userAgent.Contains("NT 6.2"))
292                 type = "Windows 8";
293             else if (userAgent.Contains("android"))
294                 type = "Android";
295             else if (userAgent.Contains("iphone"))
296                 type = "IPhone";
297             else if (userAgent.Contains("Mac"))
298                 type = "Mac";
299             else if (userAgent.Contains("NT 6.0"))
300                 type = "Windows Vista";
301             else if (userAgent.Contains("NT 5.2"))
302                 type = "Windows 2003";
303             else if (userAgent.Contains("NT 5.0"))
304                 type = "Windows 2000";
305             else if (userAgent.Contains("98"))
306                 type = "Windows 98";
307             else if (userAgent.Contains("95"))
308                 type = "Windows 95";
309             else if (userAgent.Contains("Me"))
310                 type = "Windows Me";
311             else if (userAgent.Contains("NT 4"))
312                 type = "Windows NT4";
313             else if (userAgent.Contains("Unix"))
314                 type = "UNIX";
315             else if (userAgent.Contains("Linux"))
316                 type = "Linux";
317             else if (userAgent.Contains("SunOS"))
318                 type = "SunOS";
319             else
320                 type = "未知";
321 
322             return type;
323         }
324 
325         /// <summary>
326         /// 获得请求客户端的操作系统名称
327         /// </summary>
328         /// <returns></returns>
329         public static string GetOSName()
330         {
331             string name = HttpContext.Current.Request.Browser.Platform;
332             if (string.IsNullOrEmpty(name))
333                 return "未知";
334 
335             return name;
336         }
337 
338         /// <summary>
339         /// 判断是否是浏览器请求
340         /// </summary>
341         /// <returns></returns>
342         public static bool IsBrowser()
343         {
344             string name = GetBrowserName();
345             foreach (string item in _browserlist)
346             {
347                 if (name.Contains(item))
348                     return true;
349             }
350             return false;
351         }
352 
353         /// <summary>
354         /// 是否是移动设备请求
355         /// </summary>
356         /// <returns></returns>
357         public static bool IsMobile()
358         {
359             if (HttpContext.Current.Request.Browser.IsMobileDevice)
360                 return true;
361 
362             bool isTablet = false;
363             if (bool.TryParse(HttpContext.Current.Request.Browser["IsTablet"], out isTablet) && isTablet)
364                 return true;
365 
366             return false;
367         }
368 
369         /// <summary>
370         /// 判断是否是搜索引擎爬虫请求
371         /// </summary>
372         /// <returns></returns>
373         public static bool IsCrawler()
374         {
375             bool result = HttpContext.Current.Request.Browser.Crawler;
376             if (!result)
377             {
378                 string referrer = GetUrlReferrer();
379                 if (referrer.Length > 0)
380                 {
381                     foreach (string item in _searchenginelist)
382                     {
383                         if (referrer.Contains(item))
384                             return true;
385                     }
386                 }
387             }
388             return result;
389         }
390 
391         #endregion 客户端信息

ConverterHelper 【类型转换帮助类】

Json类型数据的转换是通过开源类库Json.Net来实现，利用反射将DataTable对象转换为List对象，字符串转换为其他常用类型

  1  /// <summary>
  2     /// 类型转换助手
  3     /// </summary>
  4     public static class ConverterHelper
  5     {
  6         /// <summary>
  7         /// 利用反射和泛型
  8         /// </summary>
  9         /// <param name="dt">DataTable 对象</param>
 10         /// <returns></returns>
 11         public static List<T> DataTableToList<T>(DataTable dt) where T : class, new()
 12         {
 13             // 定义集合
 14             List<T> ts = new List<T>();
 15 
 16             // 获得此模型的类型
 17             Type type = typeof(T);
 18             //定义一个临时变量
 19             string tempName = string.Empty;
 20             //遍历DataTable中所有的数据行
 21             foreach (DataRow dr in dt.Rows)
 22             {
 23                 T t = new T();
 24                 // 获得此模型的公共属性
 25                 PropertyInfo[] propertys = t.GetType().GetProperties();
 26                 //遍历该对象的所有属性
 27                 foreach (PropertyInfo pi in propertys)
 28                 {
 29                     tempName = pi.Name;//将属性名称赋值给临时变量
 30                                        //检查DataTable是否包含此列（列名==对象的属性名）
 31                     if (dt.Columns.Contains(tempName))
 32                     {
 33                         //取值
 34                         object value = dr[tempName];
 35                         //如果非空，则赋给对象的属性
 36                         if (value != DBNull.Value)
 37                             pi.SetValue(t, value, null);
 38                     }
 39                 }
 40                 //对象添加到泛型集合中
 41                 ts.Add(t);
 42             }
 43 
 44             return ts;
 45         }
 46 
 47         /// <summary>
 48         /// 将object对象转换为Json数据
 49         /// </summary>
 50         /// <param name="obj">object对象</param>
 51         /// <returns>转换后的json字符串</returns>
 52         public static string ObjectToJson(object obj)
 53         {
 54             return JsonConvert.SerializeObject(obj);
 55         }
 56 
 57         /// <summary>
 58         /// 将Json对象转换为T对象
 59         /// </summary>
 60         /// <typeparam name="T">对象的类型</typeparam>
 61         /// <param name="jsonString">json对象字符串</param>
 62         /// <returns>由字符串转换得到的T对象</returns>
 63         public static T JsonToObject<T>(string jsonString)
 64         {
 65             return JsonConvert.DeserializeObject<T>(jsonString);
 66         }
 67 
 68         /// <summary>
 69         /// 从字符串中获取数据
 70         /// </summary>
 71         /// <param name="content">源字符串</param>
 72         /// <returns>字符串中的值</returns>
 73         public static string GetContent(string content)
 74         {
 75             return (String.IsNullOrEmpty(content) ? null : content);
 76         }
 77 
 78         /// <summary>
 79         /// 将int转换为bool类型
 80         /// </summary>
 81         /// <param name="value"></param>
 82         /// <returns></returns>
 83         public static bool ConvertIntToBool(int value)
 84         {
 85             return (value > 0 ? true : false);
 86         }
 87 
 88         #region 转Int
 89 
 90         /// <summary>
 91         /// 将string类型转换成int类型
 92         /// </summary>
 93         /// <param name="s">目标字符串</param>
 94         /// <param name="defaultValue">默认值</param>
 95         /// <returns></returns>
 96         public static int StringToInt(string s, int defaultValue)
 97         {
 98             if (!string.IsNullOrWhiteSpace(s))
 99             {
100                 int result;
101                 if (int.TryParse(s, out result))
102                     return result;
103             }
104 
105             return defaultValue;
106         }
107 
108         /// <summary>
109         /// 将string类型转换成int类型
110         /// </summary>
111         /// <param name="s">目标字符串</param>
112         /// <returns></returns>
113         public static int StringToInt(string s)
114         {
115             return StringToInt(s, 0);
116         }
117 
118         /// <summary>
119         /// 将object类型转换成int类型
120         /// </summary>
121         /// <param name="s">目标对象</param>
122         /// <param name="defaultValue">默认值</param>
123         /// <returns></returns>
124         public static int ObjectToInt(object o, int defaultValue)
125         {
126             if (o != null)
127                 return StringToInt(o.ToString(), defaultValue);
128 
129             return defaultValue;
130         }
131 
132         /// <summary>
133         /// 将object类型转换成int类型
134         /// </summary>
135         /// <param name="s">目标对象</param>
136         /// <returns></returns>
137         public static int ObjectToInt(object o)
138         {
139             return ObjectToInt(o, 0);
140         }
141 
142         #endregion 转Int
143 
144         #region 转Bool
145 
146         /// <summary>
147         /// 将string类型转换成bool类型
148         /// </summary>
149         /// <param name="s">目标字符串</param>
150         /// <param name="defaultValue">默认值</param>
151         /// <returns></returns>
152         public static bool StringToBool(string s, bool defaultValue)
153         {
154             if (s.ToLower().Equals("false"))
155                 return false;
156             else if (s.ToLower().Equals("true"))
157                 return true;
158 
159             return defaultValue;
160         }
161 
162         /// <summary>
163         /// 将string类型转换成bool类型
164         /// </summary>
165         /// <param name="s">目标字符串</param>
166         /// <returns></returns>
167         public static bool ToBool(string s)
168         {
169             return StringToBool(s, false);
170         }
171 
172         /// <summary>
173         /// 将object类型转换成bool类型
174         /// </summary>
175         /// <param name="s">目标对象</param>
176         /// <param name="defaultValue">默认值</param>
177         /// <returns></returns>
178         public static bool ObjectToBool(object o, bool defaultValue)
179         {
180             if (o != null)
181                 return StringToBool(o.ToString(), defaultValue);
182 
183             return defaultValue;
184         }
185 
186         /// <summary>
187         /// 将object类型转换成bool类型
188         /// </summary>
189         /// <param name="s">目标对象</param>
190         /// <returns></returns>
191         public static bool ObjectToBool(object o)
192         {
193             return ObjectToBool(o, false);
194         }
195 
196         #endregion 转Bool
197 
198         #region 转DateTime
199 
200         /// <summary>
201         /// 将string类型转换成datetime类型
202         /// </summary>
203         /// <param name="s">目标字符串</param>
204         /// <param name="defaultValue">默认值</param>
205         /// <returns></returns>
206         public static DateTime StringToDateTime(string s, DateTime defaultValue)
207         {
208             if (!string.IsNullOrWhiteSpace(s))
209             {
210                 DateTime result;
211                 if (DateTime.TryParse(s, out result))
212                     return result;
213             }
214             return defaultValue;
215         }
216 
217         /// <summary>
218         /// 将string类型转换成datetime类型
219         /// </summary>
220         /// <param name="s">目标字符串</param>
221         /// <returns></returns>
222         public static DateTime StringToDateTime(string s)
223         {
224             return StringToDateTime(s, DateTime.Now);
225         }
226 
227         /// <summary>
228         /// 将object类型转换成datetime类型
229         /// </summary>
230         /// <param name="s">目标对象</param>
231         /// <param name="defaultValue">默认值</param>
232         /// <returns></returns>
233         public static DateTime ObjectToDateTime(object o, DateTime defaultValue)
234         {
235             if (o != null)
236                 return StringToDateTime(o.ToString(), defaultValue);
237 
238             return defaultValue;
239         }
240 
241         /// <summary>
242         /// 将object类型转换成datetime类型
243         /// </summary>
244         /// <param name="s">目标对象</param>
245         /// <returns></returns>
246         public static DateTime ObjectToDateTime(object o)
247         {
248             return ObjectToDateTime(o, DateTime.Now);
249         }
250 
251         #endregion 转DateTime
252 
253         #region 转Decimal
254 
255         /// <summary>
256         /// 将string类型转换成decimal类型
257         /// </summary>
258         /// <param name="s">目标字符串</param>
259         /// <param name="defaultValue">默认值</param>
260         /// <returns></returns>
261         public static decimal StringToDecimal(string s, decimal defaultValue)
262         {
263             if (!string.IsNullOrWhiteSpace(s))
264             {
265                 decimal result;
266                 if (decimal.TryParse(s, out result))
267                     return result;
268             }
269 
270             return defaultValue;
271         }
272 
273         /// <summary>
274         /// 将string类型转换成decimal类型
275         /// </summary>
276         /// <param name="s">目标字符串</param>
277         /// <returns></returns>
278         public static decimal StringToDecimal(string s)
279         {
280             return StringToDecimal(s, 0m);
281         }
282 
283         /// <summary>
284         /// 将object类型转换成decimal类型
285         /// </summary>
286         /// <param name="s">目标对象</param>
287         /// <param name="defaultValue">默认值</param>
288         /// <returns></returns>
289         public static decimal ObjectToDecimal(object o, decimal defaultValue)
290         {
291             if (o != null)
292                 return StringToDecimal(o.ToString(), defaultValue);
293 
294             return defaultValue;
295         }
296 
297         /// <summary>
298         /// 将object类型转换成decimal类型
299         /// </summary>
300         /// <param name="s">目标对象</param>
301         /// <returns></returns>
302         public static decimal ObjectToDecimal(object o)
303         {
304             return ObjectToDecimal(o, 0m);
305         }
306 
307         #endregion 转Decimal
308     }

7.项目架构搭建之Models搭建

参考这里了解 EF CodeFirst，首先对EF类库进行引用，由于我的应用的使用的是SQLServer数据库，所以需要对EntityFramework.SqlServer进行引用，如果不引用子在进行数据库相关操作时会出错，错误如下：

The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' registered in the application config file for the ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded

添加类库引用
创建Entity

创建一个类，继承DbContext类，并在他的构造函数中设置连接字符串或者构造函数中传递配置文件中ConnectionStrings的name
创建数据模型models

创建Web应用中用到的Model对应数据库中的表，ViewModel另外设置，这里的models对应数据库的数据表，User示例:
启用数据迁移 EnableMigration
1. 打开 Package Manager Console
2. 执行命令 "Enable-Migrations"，如果这个项目中有两个或两个以上的继承DbContext类的Entity，需要制定Context的名称，不然会提示有多个Context。
3. 执行命令之后会生成一个 Migrations文件夹，文件夹下有一个Configuration文件，打开文件修改构造函数，设置 AutomaticMigrationsEnabled = true;