C# 如何使用异步来提高 WinForms 的性能？
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How can I use async to increase WinForms performance?
提问by Serak Shiferaw
i was doing some processor heavy task and every time i start executing that command my winform freezes than i cant even move it around until the task is completed. i used the same procedure from microsoft but nothing seem to be changed.
我正在执行一些处理器繁重的任务，每次我开始执行该命令时，我的 winform 都会冻结，直到任务完成之前我什至无法移动它。我使用了微软的相同程序，但似乎没有任何改变。
my working environment is visual studio 2012 with .net 4.5
我的工作环境是带有 .net 4.5 的 Visual Studio 2012
private async void button2_Click(object sender, EventArgs e)
{
Task<string> task = OCRengine();
rtTextArea.Text = await task;
}
private async Task<string> OCRengine()
{
using (TesseractEngine tess = new TesseractEngine(
"tessdata", "dic", EngineMode.TesseractOnly))
{
Page p = tess.Process(Pix.LoadFromFile(files[0]));
return p.GetText();
}
}
采纳答案by Jon Skeet
Yes, you're still doing all the work on the UI thread. Using asyncisn't going to automatically offload the work onto different threads. You could do this though:
是的，您仍然在 UI 线程上完成所有工作。使用async不会自动将工作卸载到不同的线程上。你可以这样做：
private async void button2_Click(object sender, EventArgs e)
{
string file = files[0];
Task<string> task = Task.Run(() => ProcessFile(file));
rtTextArea.Text = await task;
}
private string ProcessFile(string file)
{
using (TesseractEngine tess = new TesseractEngine("tessdata", "dic",
EngineMode.TesseractOnly))
{
Page p = tess.Process(Pix.LoadFromFile(file));
return p.GetText();
}
}
The use of Task.Runwill mean that ProcessFile(the heavy piece of work) is executed on a different thread.
使用Task.Runwill 意味着ProcessFile（繁重的工作）在不同的线程上执行。
回答by David Smithers
You can also do this by starting your task in new thread. Just use Thread.Start or Thread. ParameterizedThreadStart
您也可以通过在新线程中开始您的任务来做到这一点。只需使用 Thread.Start 或 Thread。参数化线程开始
See these for your reference:
请参阅以下内容以供参考：
http://msdn.microsoft.com/en-us/library/system.threading.parameterizedthreadstart.aspx
http://msdn.microsoft.com/en-us/library/system.threading.parameterizedthreadstart.aspx
