实例
StudentInfo
public class StudentInfo
{
public StudentInfo()
{
}
public StudentInfo(string nickName)
{
_nickName = nickName;
}
public StudentInfo(int age)
{
Age = age;
}
private string _nickName = "张三";
private bool _isfriend = true;
public bool IsFriend
{
get { return _isfriend; }
set { _isfriend = value; }
}
public int Age { get; set; }
public string NickName
{
get
{
if (_isfriend)
{
return _nickName;
}
else
{
return "任我行";
}
}
set { _nickName = value; }
}
/*
* ToString,GetHashCode,GetType(),Equeal
*/
public void Run()
{
Console.WriteLine($"{_nickName}我正在跑步...");
}
}
Console.WriteLine("************获取所有属性************");
//获取类型
Type t = typeof(StudentInfo);
var props = t.GetProperties();
foreach (var propertyInfo in props)
{
Console.WriteLine(propertyInfo.Name);
}
效果:
Console.WriteLine("
************获取所有方法************
");
/*
* 1.获取类型
* 2.GetMethods()
* 3.不包含构造方法
*/
var t = typeof(StudentInfo);
var methods = t.GetMethods();
foreach (var methodInfo in methods)
{
Console.WriteLine(methodInfo.Name);
}
Console.WriteLine(methods.Length);
Console.WriteLine("
************获取类型名称************
");
var t = typeof(StudentInfo);
Console.WriteLine(t.Name);
Console.WriteLine(t.FullName);//包含命名空间
Console.WriteLine("
************获取字段************
");
var t = typeof(StudentInfo);
var fields = t.GetFields(BindingFlags.NonPublic | BindingFlags.Instance);
foreach (var fieldInfo in fields)
{
Console.WriteLine(fieldInfo.Name);
}
Console.WriteLine("
************调用构造函数************
");
var t = typeof(StudentInfo);
Type[] types = new Type[1];
types[0] = typeof(string);//表示要获取参数类型为String的构造函数
var cons = t.GetConstructor(types);
//调用构造函数,并给构造传递参数值
var student = cons.Invoke(new object[] { "任我行" }) as StudentInfo;
Console.WriteLine(student.NickName);
Console.WriteLine("
************调用方法************
");
/*
* 1.获取类型
* 2.创建对象
* 3.调用方法
*/
var t = typeof(StudentInfo);
object obj = Activator.CreateInstance(t, 999);
var methodInfo = t.GetMethod("Run"); //获取需要调用的方法名称
methodInfo.Invoke(obj, null);//调用Run方法,指定方法在哪个对象下被调用,null参数表示此方法是无参方法
Singleton
public class Singleton
{
private string _nickName;
public Singleton(string nickName)
{
_nickName = nickName;
}
public string NickName => _nickName;
private void Run()
{
Console.WriteLine($"我是{_nickName},这是私有跑步方法");
}
}
Console.WriteLine("
************调用私有方法************
");
//黑科技
var t = typeof(Singleton);
var obj = Activator.CreateInstance(t, "天道无情");
var methodInfo = t.GetMethod("Run", BindingFlags.NonPublic | BindingFlags.Instance); //获取需要调用的方法名称
methodInfo.Invoke(obj, null);//调用私有方法
Console.WriteLine("
************加载程序集************
");
Assembly assembly = Assembly.Load("反射");
Type t = assembly.GetType("反射.StudentInfo");
var obj = Activator.CreateInstance(t, "天道无情");
var methodInfo = t.GetMethod("Run");
methodInfo.Invoke(obj, null);//调用
Console.WriteLine("
************反射给属性赋值************
");
var t = typeof(StudentInfo);
object obj = Activator.CreateInstance(t, 999);//创建对象
var p = t.GetProperty("NickName");
p.SetValue(obj, "范涛涛");//设置指定对象obj属性值
var val = p.GetValue(obj);//获取指定对象obj属性值
Console.WriteLine(val);
配置文件中添加
<connectionStrings>
<add name="Default" connectionString="server=127.0.0.1;database=WeekCodeFirst;uid=test1608;pwd=123456" providerName="System.Data.SqlClient"/>
</connectionStrings>
public class DbHelper<T>
{
private static readonly string _connString = ConfigurationManager.ConnectionStrings["Default"].ConnectionString;
//新增
public int Insert(T model)
{
int result = 0;
var t = typeof(T);
using (SqlConnection conn = new SqlConnection(_connString))
{
conn.Open();
string strSql = "insert into 表名(字段1,字段2,字段3) values(@字段1,@字段2,@字段3)";
StringBuilder sql = new StringBuilder();//用于字符串拼接的类
sql.Append($"Insert into {t.Name}(");
var props = t.GetProperties().ToList();
props.RemoveAt(0);//移除了主键
var names = props.Select(p => p.Name).ToList();
sql.Append(string.Join(",", names));//将类型的所有属性用","号隔开,如:属性1,属性2....
sql.Append($") values(@{string.Join(",@", names)})");
result= conn.Execute(sql.ToString(),model);
}
return result;
}
}
CourseInfo
public class CourseInfo
{
public int Id { get; set; }
public string CourseName { get; set; }
public int TeacherId { get; set; }
}
Console.WriteLine("
************反射抽象添加数据************
");
DbHelper<CourseInfo> helper = new DbHelper<CourseInfo>();
CourseInfo info = new CourseInfo()
{
Id = 899,
CourseName = "C#高级开发",
TeacherId = 22
};
helper.Insert(info);