UI線程同步

WINFORM開發中常用的UI線程同步相關代碼

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;
using System.Threading.Tasks;
using System.Threading;

namespace ThreadTestApp
{

/// <summary>
/// 線程同步測試
/// </summary>
    public partial class Form1 : Form
    {
public Form1()
        {
            InitializeComponent();
        }

private void btnInvoke_Click(object sender, EventArgs e)
        {
//1.直接調用
            OperateUI(DoSomeThing("直接調用"));

//2.同步器調用
            var v2 = new Task<string>(() => DoSomeThing("同步器調用"));
            v2.Start();
            v2.ContinueWith((o) => { OperateUI(o.Result); }, CancellationToken.None,
                    TaskContinuationOptions.OnlyOnRanToCompletion, TaskScheduler.FromCurrentSynchronizationContext());

//3.非同步異常捕捉
            var v3 = new Task<string>(() => DoSomeThing("ThrowEx"));
            v3.Start();
            v3.ContinueWith((o) => { OperateUI(v3.Exception.InnerExceptions[0].Message); }, CancellationToken.None,
                    TaskContinuationOptions.OnlyOnFaulted, TaskScheduler.FromCurrentSynchronizationContext());

//4.經典UI調用
            ThreadPool.QueueUserWorkItem((o) => { Classic(DoSomeThing("經典UI調用")); });

        }

private void Classic(string v)
        {
if (this.InvokeRequired) //需要找到一個調用控制項
            {
                Action<string> a = new Action<string>(OperateUI);
this.Invoke(a, new object[] { v });
            }
else
            {
                OperateUI(v);
            }
        }

private void OperateUI(string v)
        {

            tabDisplay.TabPages.Add(v);

            lblDisplay.Text = v;

            MessageBox.Show(v);

this.Text = v;
        }



private string DoSomeThing(string v)
        {
if (v == "ThrowEx")
throw new Exception("自訂異常");

else
return "[" + v + "]";
        }

    }
}