How Can I Safely Update GUI Elements from Non-UI Threads?

GUI elements in multi -threaded environment security updates

In multi -threaded applications, the update of the user interface (GUI) element must be performed in the creation of their threads. Try to directly modify them from other threads that may cause abnormal and unpredictable behaviors. To solve this problem, there are several ways to update the GUI from the non -UI thread safely.

Use the commission to call

One of the simplest direct methods is to use commissioned calls. This involves the "🎜> Invoke method that sends the specified GUI update method to the GUI element. The commission will then perform update operations on the correct thread.

Example:

Assuming that there is a label on one window, you need to update it with the current status of the task being processed in another thread.

In this example,

Invoke

The method is used to execute the entrustment to set the label text on the UI thread. This method allows safely to update the GUI from the non -UI thread.

<code class="language-c#">// 在工作线程上运行
string newText = "abc";
form.Label.Invoke((MethodInvoker)delegate {
    // 在UI线程上运行
    form.Label.Text = newText;
});
// 返回工作线程</code>

Note:

It should be noted that

Invoke

will block the execution until the operation is completed. This means that if the update operation requires a lot of time, using Invoke may cause synchronization problems. Therefore, it should be selectively used to quickly update or use it with asynchronous technology.

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