Silverlight WebClient 类返回空字符串
我正在尝试在 Silverlight 4 中创建一个基本的“Silverlight 类库”，以使用 Facebook 的 Graph API 返回基本的 Facebook 信息，但我只返回空字符串。 我正在使用以下代码：
string _Response = "";
public string GetFacebookMe(string access_token)
{
WebClient facebookClient = new WebClient();
facebookClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(facebookClientDownloadStringCompleted);
facebookClient.DownloadStringAsync(new Uri("https://graph.facebook.com/me" + "?access_token=" + access_token));
string ret = _Response;
return ret;
}
private void facebookClientDownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
if (e.Error == null)
{
_Response = e.Result;
}
else
{
_Response = e.Error.Message;
}
}
我在调试时尝试对值“Default”进行 init _Response，因此返回了字符串“Default”。我已经搞乱这个有一段时间了，我不确定我哪里出错了。
提前致谢！
I am trying to make a basic 'Silverlight Class Library' in Silverlight 4 to return basic Facebook Information using Facebook's Graph API, but I am only getting empty strings being returned.
I am using the following code:
string _Response = "";
public string GetFacebookMe(string access_token)
{
WebClient facebookClient = new WebClient();
facebookClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(facebookClientDownloadStringCompleted);
facebookClient.DownloadStringAsync(new Uri("https://graph.facebook.com/me" + "?access_token=" + access_token));
string ret = _Response;
return ret;
}
private void facebookClientDownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
if (e.Error == null)
{
_Response = e.Result;
}
else
{
_Response = e.Error.Message;
}
}
I tried while debugging to init _Response to the value "Default", and the string "Default" was consequently being returned. I have been messing with this for a while and I'm not sure where I'm going wrong.
Thanks in advance!
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直接使用WebClient意味着要付出很大的努力。使用 Silverlight 和 .Net Framework 4.0 时，您可以使用 Codeplex 上的 Facebook C# SDK
详细介绍了 SDK 的使用在 Prabir Shrestha 的博客中
It means a lot of effort to use directly WebClient. When using Silverlight and .Net Framework 4.0 you may use Facebook C# SDK at Codeplex
Usage of the SDK is excellently covered in this blog by Prabir Shrestha