你好 云帆，
>>在网上看到了好多用WebClient下载文件，但是有一个问题就是，使用WebClient下载完成的文件存到那里了？？
一般是下载到IsolatedStorage的，比如说下面这个静态方法：
public static void DownloadFileVerySimle(Uri fileAdress, string fileName)
{
WebClient client = new WebClient();
client.DownloadStringCompleted += (s, ev) =>
{
using (IsolatedStorageFile ISF = IsolatedStorageFile.GetUserStoreForApplication())
using (StreamWriter writeToFile = new StreamWriter(ISF.CreateFile(fileName)))
writeToFile.Write(ev.Result);
};
client.DownloadStringAsync(fileAdress);
}
>>怎么将下载完成的文件移动到自己想要的路径？
可以使用 IsolatedStorageFile.MoveFile 方法移送文件：http://msdn.microsoft.com/en-us/library/system.io.isolatedstorage.isolatedstoragefile.movefile(v=vs.110).aspx
>>或者说是下载文件只能使用HttpWebRequset或者是BackgroundTransfer
Windows Phone 8中的方式有: WebClient, WebRequest
或者 Background File Transfers:
http://msdn.microsoft.com/library/windows/apps/hh202955(v=vs.105).aspx
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