从UI线程力GUI更新 [英] Force GUI update from UI Thread

问题描述

在的WinForms，我怎么用力，从UI线程立即UI更新？

In WinForms, how do I force an immediate UI update from UI thread?

我在做什么大致是：

label.Text = "Please Wait..."
try 
{
    SomewhatLongRunningOperation(); 
}
catch(Exception e)
{
    label.Text = "Error: " + e.Message;
    return;
}
label.Text = "Success!";

标签文本不被设置为请稍候...在手术前。

Label text does not get set to "Please Wait..." before the operation.

我解决了这个使用另一个线程的操作，但它得到毛茸茸的，我想简化code。

I solved this using another thread for the operation, but it gets hairy and I'd like to simplify the code.

推荐答案

起初，我想知道为什么OP不是已经标志着回应的答案之一，但尝试它自己，以后还是有它不工作，我挖得更深一些，发现还有更多对这个问题，那么我先假定。

At first I wondered why the OP hadn't already marked one of the responses as the answer, but after trying it myself and still have it not work, I dug a little deeper and found there's much more to this issue then I'd first supposed.

有一个更好的理解可以通过类似的问题，读来获得：为什么赢了'T控制更新/刷新中期过程

A better understanding can be gained by reading from a similar question: Why won't control update/refresh mid-process

最后，为了记录在案，我能得到我的标签，通过执行以下更新：

Lastly, for the record, I was able to get my label to update by doing the following:

private void SetStatus(string status) 
{
    lblStatus.Text = status;
    lblStatus.Invalidate();
    lblStatus.Update();
    lblStatus.Refresh();
    Application.DoEvents();
}

虽然从我个人理解，这是远离优雅，正确的方法来这样做。这可能会或可能无法正常工作取决于线程的繁忙程度黑客攻击。

Though from what I understand this is far from an elegant and correct approach to doing it. It's a hack that may or may not work depending upon how busy the thread is.

这篇关于从UI线程力GUI更新的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！