扩展方法和显式转换 [英] Extension method and Explicit casting

问题描述

我正在使用某些程序集中的类（源代码不可用），因此无法更改其代码
我需要为显式强制转换运算符添加扩展方法，有什么方法可以实现？ （我尝试添加为常规扩展方法，但未成功）

I'm using class from some assembly(source code is not available), so it is not possible to change their's code I need to add extension method for explicit cast operator, is there any way to achieve that? (I have tried to add as regular extension method, but without success)

 public static explicit operator MembershipUser(this MembershipUser membership, User user)
    {
        return new MembershipUser("SimplyMembershipProvider", user.UserName, user.UserId, user.Email, null, null, user.IsApproved, user.IsLocked,
            user.CreateDate, user.LastLoginDate, user.LastActivityDate, user.CreateDate, DateTime.MinValue);
    }

我该如何解决？

推荐答案

您不能通过扩展方法重载运算符。

You cannot overload operators via Extension methods.

最好使用扩展方法：

public static MembershipUser ConvertToMembershipUser(this User user)
{
    return new MembershipUser("SimplyMembershipProvider", 
                              user.UserName, 
                              user.UserId, 
                              user.Email, 
                              null, 
                              null, 
                              user.IsApproved, 
                              user.IsLocked,
                              user.CreateDate, 
                              user.LastLoginDate, 
                              user.LastActivityDate,
                              user.CreateDate, 
                              DateTime.MinValue);
}

MembershipUser membershipUser = aUser.ConvertToMembershipUser();

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