public ActionResult Login(string returnUrl, UserRole? role),
public enum UserRole : short
{
/// <summary>
/// Represents a role of a registered user.
/// </summary>
Member = 1,
/// <summary>
/// Represents a role of a member that have been promoted by an admin or moderator.
/// </summary>
TrustedMember = 2,
/// <summary>
/// Forum moderator
/// </summary>
Moderator = 3,
/// <summary>
/// Admin role
/// </summary>
Admin = 10
}
请问“?”是什么意思,能详细说明吗?enum?
public enum UserRole : short
{
/// <summary>
/// Represents a role of a registered user.
/// </summary>
Member = 1,
/// <summary>
/// Represents a role of a member that have been promoted by an admin or moderator.
/// </summary>
TrustedMember = 2,
/// <summary>
/// Forum moderator
/// </summary>
Moderator = 3,
/// <summary>
/// Admin role
/// </summary>
Admin = 10
}
请问“?”是什么意思,能详细说明吗?enum?
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int x=0;
int? y=null;
int z=null;//报错 可空类型