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Winform软件，不要在线程里操作UI

2024-08-20 16:49:47   221人阅读

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 typepublic 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
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
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; });

 

Winform软件，不要在线程里操作UI


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