c# Beginlnvoke 委托

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{

public delegate void deletask(int num1, int num2);
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
deletask task = new deletask(test);
int num30 = int.Parse(this.textBox1.Text);
int num40 = int.Parse(this.textBox2.Text);
task.BeginInvoke(num30, num40, null, null);
}

private void test(int num1, int num2)
{
int sum = 0;
for (int i = num1; i <= num2; i++)
{
sum += num1;
num1++;
}
this.label1.Text = sum.ToString();
}

private void Form1_Load(object sender, EventArgs e)
{
Control.CheckForIllegalCrossThreadCalls = false;
}
}
}

c# 委托线程返回值

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{

public delegate int deletask(int num1, int num2);
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
deletask task = test;
int num3 = int.Parse(this.textBox1.Text);
int num4 = int.Parse(this.textBox2.Text);
//task.BeginInvoke(num3, num4, null, null);
IAsyncResult res = task.BeginInvoke(num3, num4, null, null);
int result = task.EndInvoke(res);
this.label1.Text = result.ToString();
}

private int test(int num1, int num2)
{
int sum = 0;
for (int i = num1; i <= num2; i++)
{
sum += num1;
num1++;
}
return sum;
}

private void Form1_Load(object sender, EventArgs e)
{
Control.CheckForIllegalCrossThreadCalls = false;
}
}
}