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//以上委托声明可以改为无返回值Action<T1...T16> T代表参数最多16个
  private void button1_Click(object sender, EventArgs e)
    {
        Action R = () => Run();//声明和指向(隐藏了实例化)
        a.Invoke();
        frm2.show();//如果有窗体显示一定放到最后.不然有异步不显示frm2.Textbox
    }
  public void Run()
    {
        textBox1.Text = "13534";
    }
//有参方式
  private void button1_Click(object sender, EventArgs e)
    {
        Action<string> R =m => Run(textBox1.Text);//声明和指向(隐藏了实例化)
        R.Invoke("");
    }
  public void Run(string msg )
    {
        textBox1.Text = "结果"+msg;
    }

//泛型多播委托
  Action<string> R = x => Avoid("1");
  R += Bvoid;
  R.Invoke("2");
  
  public void Avoid(string s)
    {
        MessageBox.Show("A"+s.ToString());
    }

  public static void Bvoid(string s)
    {
        MessageBox.Show("B" + s);
    }

//Func<out TResult> <返回值>
//Func<in T,out TResult> <参数,返回值>
//Func<in T1,in T2,...,in T16, out TResult> <参数1,参数2...,返回值> 
//无参
  private void button1_Click(object sender, EventArgs e)
    {
        Func<string> R =() => Run();//声明和指向(隐藏了实例化)
        R.Invoke();
    }
  public string Run()
    {
        return textBox1.Text = "结果" ;
    }
    
//有参
private void button1_Click(object sender, EventArgs e)
  {
    Func<int,string> R =v => Run(12);//Func<参数,返回值>
    R.Invoke(0);
  }
  public string Run(int Msg)
  {
      return textBox1.Text = "结果" + Msg.ToString();
  }
  
//多参
private void button1_Click(object sender, EventArgs e)
  {
    //原型:Func<string, bool, DataTable> R = new Func<string, bool, DataTable>(ds);
    Func<string, bool, DataTable> R = (string s, bool b) => ds("Lambad", true);
    dt = R.Invoke(null, true);
    MessageBox.Show(dt.Rows[0][0].ToString());
  }
 
  private static DataTable ds(string a,bool f=true)
  {
      DataTable dt=new DataTable();
      dt.Columns.Add("A");
      DataRow dr = dt.NewRow();
      dr[0] = a;
      dt.Rows.Add(dr);
      return dt;
  }
    
//替代函数
  public Func<string, int> Len = x =>
  {
    return x.Length;
  };
  
//实例应用
//原型  public static Func<string,bool,DataTable> R =(string m,bool b) =>{};
  public static Func<string,bool, System.Data.DataTable> R =(m,b) =>
  {
      System.Data.DataTable dt = new System.Data.DataTable();
      Scom = new SqlCommand(m, Scon);
      Sadp = new SqlDataAdapter();
      Sadp.SelectCommand = Scom;
      Sadp.Fill(dt);
      return dt;
  };
  
//上例原型
  public static System.Data.DataTable Run(string sql, bool flag = true)
  {
      System.Data.DataTable dt = new System.Data.DataTable();
      Scom = new SqlCommand(sql, Scon);
      Sadp = new SqlDataAdapter();
      Sadp.SelectCommand = Scom;
      Sadp.Fill(dt);
      return dt;
  }

//用委托和拉姆达表达式替代函数
     public Func<string, int> Len = x =>
        {return x.Length; };
//简化        
Func<string, object> Lenn = m => MessageBox.Show(m.Length.ToString());

//无参方式
  private delegate void DeleString();//定义委托
  Form2 frm2 = new Form2();
  private void button1_Click(object sender, EventArgs e)
    {
        DeleString a = () => Run();//无参()
        a.Invoke();
        frm2.show();//如果有窗体显示一定放到最后.不然有异步不显示frm2.Textbox
    }
  public void Run()
    {
        textBox1.Text = "13534";
    }
//有参方式
  private delegate void DeleString(string Msg);//定义委托
  private void button1_Click(object sender, EventArgs e)
    {
        DeleString a = x => Run(textBox1.Text);
        a.Invoke("");
    }
  public void Run(string msg )
    {
        textBox1.Text = "结果"+msg;
    }
    

 //多播委托
  private  delegate void DelCr(string s);
  private void button1_Click(object sender, EventArgs e)
    {
      DelCr R = new DelCr(Avoid);
      R += Bvoid;
      R.Invoke("sd");
    }
    
  public void Avoid(string s)
    {
        MessageBox.Show("A"+s.ToString());
    }

  public static void Bvoid(string s)
    {
        MessageBox.Show("B" + s);
    }