Question

我在MasterPage Facebook应用程序的ContentPage中收到错误“对象引用未设置为对象的实例”。

Site.master.cs

public FacebookSession CurrentSession
{
    get { return (new CanvasAuthorizer()).Session; }
}

protected void Page_Load(object sender, EventArgs e)
{
        var auth = new CanvasAuthorizer { Perms = "email,read_stream,publish_stream,offline_access,user_about_me" };
        if (auth.Authorize())
        {
            ShowFacebookContent();
        }
}

private void ShowFacebookContent()
{
    var fb = new FacebookClient(this.CurrentSession.AccessToken);
    dynamic myInfo = fb.Get("me");
    lblName.Text = myInfo.name;
    imgProfile.ImageUrl = "https://graph.facebook.com/" + myInfo.id + "/picture";
    lblBirthday.Text = myInfo.birthday;
    pnlHello.Visible = true;
}

这个主页工作正常＆amp;显示UserName＆amp; ProfilePic。

Default.aspx.cs

SiteMaster myMasterPage;

protected void Page_Load(object sender, EventArgs e)
{
    myMasterPage = this.Page.Master as SiteMaster;
}
public void LinkButton1_Click(object sender, EventArgs e)
{
    var fb = new FacebookClient(this.myMasterPage.CurrentSession.AccessToken);

    dynamic feedparameters = new ExpandoObject();
    feedparameters.message = (message_txt.Text == null ? " " : message_txt.Text);
    feedparameters.user_message_prompt = "userPrompt";

    /*Dictionary<string, object> feedparameters = new Dictionary<string, object>();

    feedparameters.Add("message", "Testing Application");
    feedparameters.Add("user_message_prompt", "Post To Your Wall");
    feedparameters.Add("display", "iframe");*/

    dynamic result = fb.Post("me/feed", feedparameters);
}

即使这个页面加载正常，但当我尝试使用LinkButton发布时出现问题。以下行给出了错误。

var fb =新FacebookClient（this.myMasterPage.CurrentSession.AccessToken）;

On LinkButton Click Object Reference未设置为对象的实例...

我真的很感激一些帮助。

Answer 1

Wel终于找到了问题所在。需要添加隐藏字段。

<input type="hidden" name="signed_request" value="<%: Request.Params["signed_request"]%>"/>

我认为在文档和提供的样本中都没有提及任何内容。

初始化FacebookClient时内容页面出错

1 个答案: