.NET常用方法收藏

1、过滤文本中的HTML标签

 1 /// <summary>  
 2     /// 清除文本中Html的标签  
 3     /// </summary>  
 4     /// <param name="Content"></param>  
 5     /// <returns></returns>  
 6     public static string ClearHtml(string Content)
 7     {
 8         Content = ReplaceHtml("&#[^>]*;", "", Content);
 9         Content = ReplaceHtml("</?marquee[^>]*>", "", Content);
10         Content = ReplaceHtml("</?object[^>]*>", "", Content);
11         Content = ReplaceHtml("</?param[^>]*>", "", Content);
12         Content = ReplaceHtml("</?embed[^>]*>", "", Content);
13         Content = ReplaceHtml("</?table[^>]*>", "", Content);
14         Content = ReplaceHtml(" ", "", Content);
15         Content = ReplaceHtml("</?tr[^>]*>", "", Content);
16         Content = ReplaceHtml("</?th[^>]*>", "", Content);
17         Content = ReplaceHtml("</?p[^>]*>", "", Content);
18         Content = ReplaceHtml("</?a[^>]*>", "", Content);
19         Content = ReplaceHtml("</?img[^>]*>", "", Content);
20         Content = ReplaceHtml("</?tbody[^>]*>", "", Content);
21         Content = ReplaceHtml("</?li[^>]*>", "", Content);
22         Content = ReplaceHtml("</?span[^>]*>", "", Content);
23         Content = ReplaceHtml("</?div[^>]*>", "", Content);
24         Content = ReplaceHtml("</?th[^>]*>", "", Content);
25         Content = ReplaceHtml("</?td[^>]*>", "", Content);
26         Content = ReplaceHtml("</?script[^>]*>", "", Content);
27         Content = ReplaceHtml("(javascript|jscript|vbscript|vbs):", "", Content);
28         Content = ReplaceHtml("on(mouse|exit|error|click|key)", "", Content);
29         Content = ReplaceHtml("<\?xml[^>]*>", "", Content);
30         Content = ReplaceHtml("<\/?[a-z]+:[^>]*>", "", Content);
31         Content = ReplaceHtml("</?font[^>]*>", "", Content);
32         Content = ReplaceHtml("</?b[^>]*>", "", Content);
33         Content = ReplaceHtml("</?u[^>]*>", "", Content);
34         Content = ReplaceHtml("</?i[^>]*>", "", Content);
35         Content = ReplaceHtml("</?strong[^>]*>", "", Content);
36 
37         Content = Regex.Replace(Content.Trim(), "\s+", " ");
38         string clearHtml = Content;
39         return clearHtml;
40     }
41 
42     /// <summary>  
43     /// 清除文本中的Html标签  
44     /// </summary>  
45     /// <param name="patrn">要替换的标签正则表达式</param>  
46     /// <param name="strRep">替换为的内容</param>  
47     /// <param name="content">要替换的内容</param>  
48     /// <returns></returns>  
49     private static string ReplaceHtml(string patrn, string strRep, string content)
50     {
51         if (string.IsNullOrEmpty(content))
52         {
53             content = "";
54         }
55         Regex rgEx = new Regex(patrn, RegexOptions.IgnoreCase);
56         string strTxt = rgEx.Replace(content, strRep);
57         return strTxt;
58     }
HTML标记过滤

2、页面文字长度按像素截取

 1  public static string Cutstring(object obj, int pixelLength)
 2         {
 3      string value = obj == null ? "" : obj.ToString();
 4             if (pixelLength > 0)
 5             {
 6                 int maxLength = Convert.ToInt32(Math.Floor(pixelLength / 100.0 * 8));
 7                 int keepLength = maxLength == 0 ? maxLength : maxLength - 1;
 8                 if (value.Length > maxLength)
 9                 {
10                     string endString = "...";
11                     value = value.Substring(0, keepLength) + endString;
12                 }
13             }
14             return value;
15 }
字符串截取

3、FileUpload上传文件

//使用方法
  string StudentPhoto = "";
   bool UploadResult = false;
 if (FileUp.HasFile)
                {
                    StudentPhoto = UploadFile(FileUp, "UpLoad/System/StudentPhoto", new string[] { ".gif", ".png",".jpg" }, 2, out UploadResult);
                    if (!UploadResult)
                    {
//上传不成功操作
  string UpMsg = "$('#IsRefresh').val('TwoNotice');art.dialog({title:'提示',icon:'warning',content:'" + StudentPhoto + "'});";
                        Page.ClientScript.RegisterStartupScript(ClientScript.GetType(), "upmsg", UpMsg, true);
            }
else
{
//上传成功后操作
}
 
 /// <summary>
    /// 指定上传控件到指定路径
    /// </summary>
    /// <param name="Upload1">上传控件</param>
    /// <param name="UpPath">上传路径,对于站点路径,如:UpLoad/System</param>
    /// <param name="FileType">文件后缀{ ".gif", ".png", ".bmp", ".jpg" }</param>
    /// <param name="FileSize">上传文件大小单位MB</param>
    /// <param name="UploadMessage">是否上传成功</param>
    /// <returns>上传成功返回路径，失败返回原因</returns>
    protected string UploadFile(FileUpload Upload1, string UpPath, string[] FileType, double FileSize, out bool UploadMessage)
    {
        UploadMessage = false;
        string UpFile = "";
        string FileMessage = "";
        string strName = Upload1.PostedFile.FileName;
        double filesize = Convert.ToDouble(Upload1.PostedFile.ContentLength) / 1024 / 1024;
        string Extensions = "";
        if (strName != "")
        {
            string fileExtension = System.IO.Path.GetExtension(Upload1.FileName).ToLower();
            string newName = Guid.NewGuid().ToString();
            string juedui = Server.MapPath("~/" + UpPath + "/");
            string newFileName = juedui + newName + fileExtension;
            if (Upload1.HasFile)
            {
                //验证文件格式
                string[] allowedExtensions = FileType;
                bool FileEx = false;
                for (int j = 0; j < allowedExtensions.Length; j++)
                {
                    Extensions += allowedExtensions[j] + ";";
                    if (fileExtension == allowedExtensions[j])
                    {
                        FileEx = true;
                    }
                }
                if (!FileEx)
                {
                    FileMessage += "文件上传失败，错误原因:按指定格式上传(" + Extensions + ");";
                }
                //验证文件大小
                if (filesize > FileSize)
                {
                    FileMessage += string.Format("请按照指定文件大小上传，文件限定{0}MB,当前文件[{1}]共{2}MB", FileSize, strName, String.Format("{0:F}", filesize));
                }

                if (FileMessage == "")
                {
                    try
                    {
                        if (!Directory.Exists(juedui))
                        {
                            Directory.CreateDirectory(juedui);
                        }
                        Upload1.PostedFile.SaveAs(newFileName);
                        UpFile = "../" + UpPath + "/" + newName + fileExtension;
                        UploadMessage = true;
                    }
                    catch (Exception EX)
                    {
                        UploadMessage = false;
                        FileMessage += EX.Message;
                    }
                }
                else
                {
                    UploadMessage = false;
                }
            }
        }
        else
        {
            FileMessage += "照片文件选择已过期，请重新选择；";
        }
        if (UploadMessage)
            return UpFile;
        else
            return FileMessage;
    }
FileUpload上传文件

4、异步上传服务端文件保存

 HttpPostedFile file = Request.Files["Filedata"];//上传文件对象
                string uploadPath = Server.MapPath("~/UpLoad/QueAttach/");
                if (file != null)
                {
                    if (!Directory.Exists(uploadPath))
                    {
                        Directory.CreateDirectory(uploadPath);
                    }
                    string ExtName = Path.GetExtension(file.FileName);
                    string FileName= file.FileName .Replace(ExtName,"");
                    string fileName = "【" + FileName + "】" + DateTime.Now.ToString("yyyyMMddHHmmss") + ExtName;
                    file.SaveAs(uploadPath + fileName);
                    //下面这句代码缺少的话，上传成功后上传队列的显示不会自动消失
                    Response.Write(FileName);
                }
                else
                {
                    Response.Write("0");
                }
View Code

5、POST数据提交

 /// <summary>
        /// POST提交数据接收字符json
        /// </summary>
        /// <param name="url">远程服务器路径</param>
        /// <param name="postData">提交数据</param>
        /// <returns>接收数据</returns>
        protected static string PostData(string url, byte[] postData)
        {
            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url);
            myRequest.Method = "POST";
            myRequest.ContentType = "application/x-www-form-urlencoded";
            myRequest.ContentLength = postData.Length;

            Stream newStream = myRequest.GetRequestStream();
            // Send the data. 
            newStream.Write(postData, 0, postData.Length);
            newStream.Close();

            // Get response 
            HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
            StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
            return reader.ReadToEnd();
        }

//调用方法
   /// <summary>
        /// 获取直播录制信息
        /// </summary>
        /// <param name="webcastId">直播ID</param>
        /// <returns>录制视频</returns>
        public RecordInfo Get_Live_Transcribe(string webcastId)
        {
            RecordInfo jsonOut = null;
            try
            {
                string Url = "http://";
                string LocalData = "loginName=admin%40ruiyoutech.com&password=ruiyoutech&sec=&webcastId=" + webcastId;
                string strJsonInput = PostData(Url, System.Text.Encoding.Default.GetBytes(LocalData));
                JavaScriptSerializer serializer = new JavaScriptSerializer();
                 jsonOut = serializer.Deserialize<RecordInfo>(strJsonInput);
            }
            catch(Exception e)
            {
                
            }
            return jsonOut;
        }
View Code

6、获取url字符串中指定参数值

  var urlRegex = System.Text.RegularExpressions.Regex.Match(visit.rf, @"(?:^|?|&)ssp=(.*)(?:&|$)");
   ssprf = urlRegex.Groups[1].ToString();
View Code
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原文地址：https://www.cnblogs.com/loyung/p/4625974.html