blocks|key|808491|text|您应该将UI修改从Timer+thread分派到UI+Thread。不允许从其他线程修改UI元素。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|808492|要做到这一点，您需要调用this.BeginInvoke。|808493|How+to+update+the+GUI+from+another+thread+in+C#?|808494|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/661561/how-to-update-the-gui-from-another-thread-in-c^0|9|C|O|9|0|C|G|0|0|1C|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|Z|8|@]|D|@$9|10|A|11|1|12]]|E|$]]|$1|J|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|Q]]]]

You should dispatch UI modifications from your <code>Timer thread</code> to <code>UI Thread</code>. Modifying UI elements from another threads is not allowed.

To do it you need to call <code>this.BeginInvoke</code>.

<a href="https://stackoverflow.com/questions/661561/how-to-update-the-gui-from-another-thread-in-c">How to update the GUI from another thread in C#?</a>

blocks|key|4189385|text|我不确定我理解您的问题，但听起来好像您在从后台线程更新UI时遇到了问题吗？如果是这样，请尝试如下：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4189386|timer.Start()将启动一个与WinForm的UI线程分离的新线程，因此您可能需要调用WinForm的线程来查看更改。|offset|length|style|BOLD|4189387|timer.Elapsed+%2B=+((source,+e)+=>
{
++++var+INDEX+=+Form.ActiveForm.Controls.IndexOfKey("errorBox");
++++Debug.WriteLine(Form.ActiveForm.Controls[INDEX]);
++++//Invoke+the+instance+of+"Form"+to+process+changes+on+the+UI+thread
++++Form.Invoke((MethodInvoker)delegate
++++{
++++++++Form.ActiveForm.Controls[INDEX].Text+=+"";
++++});
++++Debug.WriteLine("2"+%2B+Form.ActiveForm.Controls[INDEX]);
});
timer.Enabled+=+true;
timer.Start();|code-block|syntax|javascript|4189388|--我对调用的思考|4189389|如果WinForm而非数据绑定|4189390|myControl.Invoke((MethodInvoker)+delegate+{/*update+UI+related+values+here*/});|4189391|或|4189392|myForm.Invoke((MethodInvoker)+delegate+{/*update+UI+related+values+here*/});|4189393|如果INotifyPropertyChange和数据绑定，您可能需要通过更新对象的数据库属性来更新UI，或者调用数据库对象来更新自己的属性(排队的WinForm或强制刷新UI的另一个类似的接口)。请注意，将您的代码重构为数据绑定对象到您的UI也可以证明是一个永久的解决方案。|4189394|如果是XAML\WPF，可以使用以下代码片段强制从基本应用程序的dispatcher中更新XPF\XAML+UI，如下所示：|4189395|System.Windows.Application.Current.Dispatcher.Invoke((System.Action)delegate+{/*update+UI+related+values+here*/});|4189396|干杯!|4189397|entityMap^0|0|0|D|0|0|0|6|0|0|0|0|0|2|L|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@$D|18|E|19|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|1A|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|1B|8|@$D|1C|E|1D|F|G]]|9|@]|A|$]]|$1|O|3|P|5|6|7|1E|8|@]|9|@]|A|$]]|$1|Q|3|R|5|J|7|1F|8|@]|9|@]|A|$K|L]]|$1|S|3|T|5|6|7|1G|8|@]|9|@]|A|$]]|$1|U|3|V|5|J|7|1H|8|@]|9|@]|A|$K|L]]|$1|W|3|X|5|6|7|1I|8|@$D|1J|E|1K|F|G]]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1L|8|@]|9|@]|A|$]]|$1|10|3|11|5|J|7|1M|8|@]|9|@]|A|$K|L]]|$1|12|3|13|5|6|7|1N|8|@]|9|@]|A|$]]|$1|14|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]]|15|$]]

I'm not positive I understand your problem, but it sounds like you're having an issue updating the UI from a background thread? If so, try this:

timer.Start() starts a new thread separate from your Winform's UI thread, so you may need to Invoke your WinForm's thread in order to see the changes.

<pre><code>timer.Elapsed += ((source, e) =&gt;
{
 var INDEX = Form.ActiveForm.Controls.IndexOfKey("errorBox");
 Debug.WriteLine(Form.ActiveForm.Controls[INDEX]);
 //Invoke the instance of "Form" to process changes on the UI thread
 Form.Invoke((MethodInvoker)delegate
 {
 Form.ActiveForm.Controls[INDEX].Text = "";
 });
 Debug.WriteLine("2" + Form.ActiveForm.Controls[INDEX]);
});
timer.Enabled = true;
timer.Start();
</code></pre>

<hr>

<h2>My thoughts on Invoking</h2>

If WinForm and NOT Data Bound

<pre><code>myControl.Invoke((MethodInvoker) delegate {/*update UI related values here*/});
</code></pre>

or

<pre><code>myForm.Invoke((MethodInvoker) delegate {/*update UI related values here*/});
</code></pre>

If WinForm and Data Bound, you may need to update the UI by updating the databound property of your object, or invoke the databound object to update its own property (queueing INotifyPropertyChange or another similar Interface which will force refresh the UI). Note that refactoring your code to data-bind objects to your UI could also prove a permanent solution.

If XAML\WPF, you can use the following snippet to force update your XPF\XAML UI from the base application's dispatcher, like this:

<pre><code>System.Windows.Application.Current.Dispatcher.Invoke((System.Action)delegate {/*update UI related values here*/});
</code></pre>

Cheers!

I'm trying to display an error on my form and use timer to remove the error in a second. I have:

<pre><code>const string sendingError = "currently sending a message please wait";
System.Timers.Timer timer = new System.Timers.Timer(1000);
commandValues.errorList[sendingError] = sendingError;
commandValues.updateErrorList();
</code></pre>

this functions as it should by updating a label with the error message

<pre><code>timer.Elapsed += ((source, e) =&gt; 
{
 var INDEX = Form.ActiveForm.Controls.IndexOfKey("errorBox");
 Debug.WriteLine(Form.ActiveForm.Controls[INDEX]);
 Form.ActiveForm.Controls[INDEX].Text = "";
 Debug.WriteLine("2" + Form.ActiveForm.Controls[INDEX]);
});

timer.Enabled = true;
timer.Start();
</code></pre>

the debug line displays

<pre><code>1System.Windows.Forms.Label, Text: currently sending a message please wait
1System.Windows.Forms.Label, Text: currently sending a message please wait
1System.Windows.Forms.Label, Text: currently sending a message please wait
1System.Windows.Forms.Label, Text: currently sending a message please wait
// etcetera
</code></pre>

As you can see, the second debug line is never displaying. Break points agree that it leaves the delegate when I try to change the label.

I'm new to C# so any advice would be appreciated, but specifically I would like to know how to have the main form edited after a timeout and why my attempt is failing.

How to edit the main form in C# from a timer?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我试图在窗体上显示一个错误，并使用计时器在一秒钟内删除错误。我有：const string sendingError = "currently sending a message please wait";System.Timers.Timer timer = new System.Timers.Timer(1000)...

问如何从定时器中编辑C#中的主表单？
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问如何从定时器中编辑C#中的主表单？EN