c# – 如何使用Dynamic进行回调？

概述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 == LiveC 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 SignInuserService.SignIn(openID,new Action<ErrorModel>(Callback));

总结

以上是内存溢出为你收集整理的c# – 如何使用Dynamic进行回调？全部内容，希望文章能够帮你解决c# – 如何使用Dynamic进行回调？所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。