是的，你仍然在做UI线程上的所有工作的 的。使用异步是不会自动卸载工作到不同的线程。你可以这样做，但：

 专用异步无效button2_Click（对象发件人，EventArgs的发送）
{
    字符串文件=文件[0];
    任务＆LT;串GT;任务= Task.Run（（）=＆GT; ProcessFile（文件））;
    rtTextArea.Text =等待任务;
}私人字符串ProcessFile（字符串文件）
{
    使用（TesseractEngine苔丝=新TesseractEngine（tessdata，DIC
                                                      EngineMode.TesseractOnly））
    {
        网页P = tess.Process（Pix.LoadFromFile（文件））;
        返回p.GetText（）;
    }
}
 

使用 Task.Run 将意味着 ProcessFile （沉重的工作片）是在执行不同的主题。

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.

my working environment is visual studio 2012 with .net 4.5

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();
    }
}

Yes, you're still doing all the work on the UI thread. Using async isn't going to automatically offload the work onto different threads. You could do this though:

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.Run will mean that ProcessFile (the heavy piece of work) is executed on a different thread.