webclient 下载,该如何处理

webclient 下载

C# code

Uri url = new Uri("http://localhost:2215/2.rar");WebClient client = new WebClient();client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);    client.OpenReadAsync(url);void client_OpenReadCompleted(object obj, OpenReadCompletedEventArgs e)        {            if (e.Error == null)            {                Stream stream = e.Result;                byte[] by = new byte[stream.Length + 1];                stream.Read(by, 0, by.Length);                FileStream fs = new FileStream("C:\\aa.rar", FileMode.CreateNew,FileAccess.Write);                fs.Write(by, 0, by.Length);                fs.Flush();                fs.Close();                            }        }

试图访问该方法时失败: 
System.IO.FileStream..ctor(System.String, System.IO.FileMode, System.IO.FileAccess)

不知道怎么解决 本人刚学SL 什么都不清楚 


[解决办法]
C:\\aa.rar,
不能操作本地文件系统，
[解决办法]
void client_OpenReadCompleted(object obj, OpenReadCompletedEventArgs e)
{
if (e.Error == null)
{
Stream stream = e.Result;
byte[] by = new byte[stream.Length + 1];
stream.Read(by, 0, by.Length);
FileStream fs = new FileStream("C:\\aa.rar", FileMode.CreateNew,FileAccess.Write);
fs.Write(by, 0, by.Length);
fs.Flush();
fs.Close();

}
}




Silverlight 2&3，作为客户端没有权限访问本地磁盘，你可以使用WCF或者Webservice，传递参数到服务器端进行存取处理。

Silverlight 4中允许客户端对本地文件访问。

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