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  • C# 线程更新UI

    最方便的用法:

    private void ViewMsg(string msg)
            {

    /*

    control.Invoke(new SetControlTextDelegate((ct, v) => { ct.Text = v; }), new object[] { control, value });
    =>
    control.Invoke(new Action<Control, string>((ct, v) => { ct.Text = v; }), new object[] { control, value });

    */
                this.rtb.Invoke(new Action<RichTextBox, string>((ct, v) => { ct.AppendText(v); ct.Refresh(); }),
                        new object[] { this.rtb, msg });
                this.rtb.Invoke(new Action<string>((v) => { this.rtb.AppendText(v); this.rtb.Refresh(); }),
                        msg);
            }

    Because Invoke/BeginInvoke accepts Delegate (rather than a typed delegate), you need to tell the compiler what type of delegate to create ; MethodInvoker (2.0) or Action (3.5) are common choices (note they have the same signature); like so:

    control.Invoke((MethodInvoker)delegate{this.Text="Hi";});

    If you need to pass in parameters, then "captured variables" are the way:

    string message ="Hi";
    control.Invoke((MethodInvoker)delegate{this.Text= message;});

    (caveat: you need to be a bit cautious if using captures async, but sync is fine - i.e. the above is fine)

    Another option is to write an extension method:

    public static void Invoke(thisControl control,Action action){
        control.Invoke((Delegate)action);}

    then:

    this.Invoke(delegate{this.Text="hi";});// or simce we are using C# 3.0this.Invoke(()=>{this.Text="hi";});

    You can of course do the same with BeginInvoke:

    publicstaticvoidBeginInvoke(thisControl control,Action action){
        control.BeginInvoke((Delegate)action);}

    If you can't use C# 3.0, you could do the same with a regular instance method, presumably in a Form base-class.

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  • 原文地址:https://www.cnblogs.com/zeroone/p/3306504.html
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