c# - 传递参数时出错

Question

我有一个 UserBll 类，它有以下方法

public string GetaspnetUserIdByUserName(string name )
{
    string _lsttUserId = (from aspnet in db.aspnet_Users
                            where aspnet.UserName.Equals(name)
                            select aspnet.UserId
                         ).ToString();
    return _lsttUserId;
}

我创建了一个具有 UserId 和 UserName 字段的 Usertable 实例，我正在使用以下代码

UserBLL bll = new UserBL
UserTable uTable = new UserTable();
uTable.UserId = bll.GetaspnetUserIdByUserName(Membership.GetUser(model.UserName));

在上面的代码中我得到以下错误:

GetaspnetUserIdByUserName has some invalid argument

谁能告诉我我做错了什么

Answer 1

Membership.GetUser不返回字符串，它返回一个 MembershipUser .

你想要:

string username = Membership.GetUser(model.UserName).UserName;

如果您想查看发生了什么:

MembershipUser theUser = Membership.GetUser(model.UserName);
string userName = theUser.UserName;