在Silverlight和异步回调保存文件 [英] Saving Files in silverlight and asynchronous call backs

问题描述

在Silverlight中，你必须使用保存文件对话框，保存文件。

In Silverlight you have to save a file using the save file dialog.

您只能从用户事件又名点击一个按钮打开此对话框

You can only open this dialog from a user event aka a button click

我从Web服务调用返回的文件的数据不同步

I’m returning the data of a file from a web service call asynchronously

我如何保存这文件？

如果我问他们的服务电话之前，我不能使用流后的数据回来。

If i ask them before the service call i can’t use the stream after the data comes back.

如果我问他们后，我无法打开保存文件对话框。

If i ask them after i can’t open the save file dialogue.

这是一个有点鸡和蛋的情况的。

It’s a bit of chicken and the egg situation.

感谢。

更新

我希望能够保存用户的电脑，他们spectifiy不是Silverlight的隔离存放。

i want to be able to save the users computer where they spectifiy not the silverlight isolated storage.

推荐答案

从用户事件打开 SaveFileDialog ，然后继续引用这个对话框各地。让您的Web服务调用，那么在处理这个调用，调用<一href="http://msdn.microsoft.com/en-us/library/system.windows.controls.savefiledialog.openfile%28v=VS.95%29.aspx"相对=nofollow> 打开文件（）方法上的 SaveFileDialog 。使用此方法返回的流写入到您的文件。

Open a SaveFileDialog from a user event, then keep a reference to this dialog around. Make your web service call, then in the handler for this call, call the OpenFile() method on the SaveFileDialog. Use the stream returned by this method to write to your file.

private SaveFileDialog _mySaveDialog;

private void Button_Click(object sender, EventArgs e)
{
   _mySaveDialog = new SaveFileDialog();
   // Configure the dialog and show it here...
}

// call this method from the handler for your web service call
private void Save(string toSave) 
{
   Stream fileStream = _mySaveDialog.OpenFile();
   // Write to the file here...
}

如果你想使用同样的技术更详细的例子，请参阅<一href="http://www.silverlightshow.net/items/Using-the-SaveFileDialog-in-Silverlight-3.aspxhttp://www.silverlightshow.net/items/Using-the-SaveFileDialog-in-Silverlight-3.aspx"相对=nofollow>这里。

If you'd like an even more detailed example that uses this same technique, see here.

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