C#多线程下更新UI的几种方法
1. 使用UI线程的SynchronizationContext的Post/Send方法,这种情况一般在窗体构造函数或者FormLoad中获取同步上下文;
范例:
public partial class Form1 : Form { SynchronizationContext SyncContext = null; public Form1() { InitializeComponent(); //获取UI线程同步上下文 SyncContext = SynchronizationContext.Current; } private void btnOk_Click(object sender, EventArgs e) { ThreadPool.QueueUserWorkItem(d=> { //模拟耗时操作 Thread.Sleep(1000); SyncContext.Post(m => { var result = m as string; txtName.Text = result; }, "异步操作完成结果"); }); } }
public partial class Form1 : Form { SynchronizationContext SyncContext = null; public Form1() { InitializeComponent(); //获取UI线程同步上下文 SyncContext = SynchronizationContext.Current; } private void btnOk_Click(object sender, EventArgs e) { ThreadPool.QueueUserWorkItem(d=> { //模拟耗时操作 Thread.Sleep(1000); SyncContext.Send(m => { var result = m as string; txtName.Text = result; }, "异步操作完成结果2"); }); } }
2、使用Control的Invoke/BegainInvoke方法更新;
范例:
public partial class Form1 : Form { // SynchronizationContext SyncContext = null; public Form1() { InitializeComponent(); //获取UI线程同步上下文 //SyncContext = SynchronizationContext.Current; } private void btnOk_Click(object sender, EventArgs e) { ThreadPool.QueueUserWorkItem(d=> { //模拟耗时操作 Thread.Sleep(1000); if (txtName.InvokeRequired) { txtName.Invoke(new Action<Control, string>((ctrl, data) => { ctrl.Text = data; }), new object[] { txtName, "异步操作完成结果3" }); } else { txtName.Text = "异步操作完成结果3"; } }); } }
posted on 2017-11-23 16:10 weicanpeng 阅读(1212) 评论(0) 编辑 收藏 举报