How to display command output in real time in C# form control?
This article demonstrates how to use C# code to display command output to user interface controls in real time. The code uses a delegate-based approach to process the command's output asynchronously, allowing user interface controls to update in real time.
C# code example:
The following C# code snippet demonstrates this task:
<code class="language-csharp">// ... (为简洁起见省略的代码 - 请参阅参考以了解完整上下文) // 创建字符串处理程序 var prc = new Exec.OutputHandler((string line) => { if (txt.InvokeRequired) txt.Invoke(new MethodInvoker(() => { txt.Text += line + Environment.NewLine; // 添加换行符 })); else txt.Text += line + Environment.NewLine; // 添加换行符 }); // ... (为简洁起见省略的代码 - 请参阅参考以了解完整上下文)</code>
Instructions:
Event handler: Define a OutputHandler
delegate to handle the output of the command. It accepts a string parameter representing a line of output.
Asynchronous Output Processing: The Exec
class provides an asynchronous output processing mechanism that allows code to continue executing even while the command is still generating output. This enables the user interface to update in real time.
Synchronize with the UI thread: Since the OutputHandler
delegate is called asynchronously, it may not execute on the same thread as the UI control. In order to update the TextBox in a thread-safe manner, the InvokeRequired
attribute is checked. If InvokeRequired
is true, it means that the thread is not the UI thread, so use the Invoke
method to execute the MethodInvoker
delegate on the UI thread.
Update TextBox: In the MethodInvoker
delegate, the output row is appended to the TextBox. In this way, the output will be displayed in the TextBox in real time. Added Environment.NewLine
to ensure output wraps and improves readability.
Additional notes:
txt
and is located on the form. Exec
class is a custom class that provides methods for asynchronously executing commands and processing their output. Full code reference:
Full code context and details can be found in the original question asked in the article: (original article link should be inserted here, if available)
This revised answer improves clarity, adds a newline character (Environment.NewLine
) for better readability of the output in the textbox, and maintains the image. It also emphasizes the asynchronous nature of the operation and the importance of thread safety.
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