Winform软件，不要在线程里操作UI

对于Winform软件，不要在线程里操作UI，不要相信：StartForm.CheckForIllegalCrossThreadCalls = false;

于是，把所有的代码都改成主线程委托调用的方式

private delegate void SetTextHandle(string id, string value);

private void ThreadSetText(string id, string value)
{
this.Controls.Find(id, true)[0].Text = value;
}
private void SetText(string id, string value)
{
if (this.InvokeRequired)
{
this.Invoke(new SetTextHandle(ThreadSetText), new object[] { id, value });
}
else
{
ThreadSetText(id, value);
}
}

2

// the canonical form (C# consumer)

public delegate void ControlStringConsumer(Control control, string text);  // defines a delegate type

public void SetText(Control control, string text) {
if (control.InvokeRequired) {
control.Invoke(new ControlStringConsumer(SetText), new object[]{control, text});  // invoking itself
} else {
control.Text=text;      // the "functional part", executing only on the main thread
}
}

3

public static class ControlHelpers
{
public static void InvokeIfRequired<T>(this T control, Action<T> action) where T : ISynchronizeInvoke
{
if (control.InvokeRequired)
{
control.Invoke(new Action(() => action(control)), null);
}
else
{
action(control);
}
}
}

Use it like this:

private void UpdateSummary(string text)
{
summary.InvokeIfRequired(s => { s.Text = text });
}

3[/code]

theLabel.Invoke(new Action(() => theLabel.Text = "hello world from worker thread!"));

4

public static void InvokeIfRequired(this Control control, MethodInvoker action)
{
if (control.InvokeRequired) {
control.Invoke(action);
} else {
action();
}
}

调用：

richEditControl1.InvokeIfRequired(() =>
{
// Do anything you want with the control here
richEditControl1.RtfText = value;
RtfHelpers.AddMissingStyles(richEditControl1);
});

更新为:

public static void InvokeIfRequired(this ISynchronizeInvoke obj,
MethodInvoker action)
{
if (obj.InvokeRequired) {
var args = new object[0];
obj.Invoke(action, args);
} else {
action();
}
}

考虑仍出现异常时：

while (!control.Visible)
{
System.Threading.Thread.Sleep(50);
}

5[/code]

public static void InvokeIfRequired(this Control c, Action<Control> action)
{
if(c.InvokeRequired)
{
c.Invoke(new Action(() => action(c)));
}
else
{
action(c);
}
}

变更为：

public static void InvokeIfRequired<T>(this T c, Action<T> action)
where T : Control

调用方法：

object1.InvokeIfRequired(c => { c.Visible = true; });