C#多线程下更新UI的几种方法

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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(); 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";
}
});
}
}