c# - 错误: Unable to perform runtime binding (when location/hometown/any setting is not set in facebook profile)

我遇到错误

无法对空引用执行运行时绑定(bind)

说明:执行当前Web请求期间发生未处理的异常。请查看堆栈跟踪，以获取有关错误及其在代码中起源的更多信息。

异常详细信息:Microsoft.CSharp.RuntimeBinder.RuntimeBinderException:无法对空引用执行运行时绑定(bind)

源错误:

第27行:lblBirthday.Text =(myInfo.birthday == null？string.Empty:DateTime.Parse(myInfo.birthday).ToString(“dd-MMM-yy”)));
第28行:lblHometown.Text =(myInfo.hometown.name == null？string.Empty:myInfo.hometown.name);
第29行:lblLocation.Text =(myInfo.location.name == null？string.Empty:myInfo.location.name);
第30行:pnlHello.Visible = true;
第31行:}

这是我的代码:

var fb = new FacebookWebClient();
    dynamic myInfo = fb.Get("me");
    lblName.Text = myInfo.name;
    imgProfile.ImageUrl = "https://graph.facebook.com/" + myInfo.id + "/picture";
    lblBirthday.Text = (myInfo.birthday == null ? string.Empty : DateTime.Parse(myInfo.birthday).ToString("dd-MMM-yy"));
    lblHometown.Text = (myInfo.hometown.name == null ? string.Empty : myInfo.hometown.name);
    lblLocation.Text = (myInfo.location.name == null ? string.Empty : myInfo.location.name);
    pnlHello.Visible = true;

最佳答案

首先检查myInfo.location是否为空:

lblLocation.Text = myInfo.location == null ? "" : myInfo.location.name ?? "";

(对于类似的成员也是如此。)

诚然，这有点麻烦，但是基本上，您需要考虑可能为空的任何内容，以确保您不尝试取消引用它。

关于c# - 错误: Unable to perform runtime binding (when location/hometown/any setting is not set in facebook profile)，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/5336163/