我一直收到这个错误,不知道如何纠正它
Error 1 Cannot use ‘Callback’ as an argument to a dynamically
dispatched operation because it is a method group. Did you intend to
invoke the method?
//...
if (e.Status == LiveConnectSessionStatus.Connected)
{
client = new LiveConnectClient(e.Session);
LiveOperationResult operationResult = await client.GetAsync("me");
try
{
dynamic meResult = operationResult.Result;
var openId = meResult.id;
var email = meResult.emails.preferred;
//MessageBox.Show(openId);
//MessageBox.Show(email);
userService.SignIn(openId,email,Callback);
}
catch (LiveConnectException exception)
{
MessageBox.Show("Error calling API: " + exception.Message);
}
}
}
private void Callback(ErrorModel error)
{
if (error != null)
{
MessageBox.Show(error.FriendlyErrorMsg,error.Caption,MessageBoxButton.OK);
}
else
{
}
}
public void SignIn(string id,string email,Action<ErrorModel> callBack)
{
}
解决方法
问题是这个调用是动态的：
userService.SignIn(openId,Callback);
它必须是,因为openId和email被推断为动态类型：
var openId = meResult.id; var email = meResult.emails.preferred;
您不能在动态调用中使用这样的方法组转换 – 这只是使用动态的限制之一.
所以,选项：
>提供openId和电子邮件显式类型(如果userService不是动态的)将使调用非动态,方法组转换将起作用.这只是意味着明确指定类型,因为动态可以使用隐式转换：
string openId = meResult.id; string email = meResult.emails.preferred; userService.SignIn(openId,Callback);
>如果要保持SignIn调用动态,请从Callback方法创建特定的委托类型实例：
var openId = meResult.id; var email = meResult.emails.preferred; // Or use whichever delegate type is actually appropriate for SignIn userService.SignIn(openId,new Action<ErrorModel>(Callback));
