Windows Phone 7上的Dispatcher.Invoke（）？ [英] Dispatcher.Invoke() on Windows Phone 7?

问题描述

在回调方法中，我尝试获取文本框的文本属性，如下所示：

In a callback method I am attempting to get the text property of a textBox like this:

string postData = tbSendBox.Text;

但是因为它没有在UI线程上执行，所以给了我一个跨线程异常。

But because its not executed on the UI thread it gives me a cross-thread exception.

我想要这样的东西：

Dispatcher.BeginInvoke(() =>
{
    string postData = tbSendBox.Text;
});

但这是异步运行的。同步版本为：

But this runs asynchronously. The synchronous version is:

Dispatcher.Invoke(() =>
{
    string postData = tbSendBox.Text;
});

但是Windows Phone不存在Dispatcher.Invoke（）。有等同的东西吗？有其他方法吗？

But Dispatcher.Invoke() does not exist for the Windows Phone. Is there something equivalent? Is there a different approach?

这里是整个函数：

public void GetRequestStreamCallback(IAsyncResult asynchronousResult)
    {
        HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;

        // End the operation
        Stream postStream = request.EndGetRequestStream(asynchronousResult);

        string postData = tbSendBox.Text;

        // Convert the string into a byte array.
        byte[] byteArray = Encoding.UTF8.GetBytes(postData);

        // Write to the request stream.
        postStream.Write(byteArray, 0, postData.Length);
        postStream.Close();

        // Start the asynchronous operation to get the response
        request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);
    }

推荐答案

否，您可以仅访问异步之一。为什么要同步，因为您位于用户界面的另一个线程上？

No you are right you can access only to the async one. Why do you want sync since you are on a different thread of the UI one?

Deployment.Current.Dispatcher.BeginInvoke(() =>
       {
            string postData = tbSendBox.Text;
        });

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