c# - IsUserInRole 调用 GetRolesForUser？

Question

当我实现 RoleProvider 类并调用 Roles.IsUserInRole(string username, string roleName) 时，代码执行首先转到方法“GetRolesForUser(string username)”。为什么是这样？当我只是在寻找该用户是否属于一个角色的单一值时，我不想迭代所有角色。这是 .NET 的角色提供程序类的限制，还是我可以做些什么来更多地控制代码的执行？

调用代码如下

if (Roles.IsUserInRole(CurrentUser.UserName, "Teacher")) {

这是 IsUserInRole 的实现

public override bool IsUserInRole(string username, string roleName) { return true; }

但是代码 GetRolesForUser 总是首先实现:

public override string[] GetRolesForUser(string username) {
        string[] roles = GetAllRoles();
        List<string> userRoles = new List<string>();
        foreach (string role in roles) {
            if (IsUserInRole(username, role)) {
                userRoles.Add(role);
            }
        }
        return userRoles.ToArray();
    }

Answer 1

The RoleProvider.IsUserInRole(username, password) is used for checking roles for a given user which is not the current loggon user(for current logon user, it also use the Principal.IsInRole instead). And for RolePrincipal, it always use the GetRolesForUser to cache the roles and do the role checking among the cached role list. (source)

可以使用 Roles.Provider.IsUserInRole 而不是 Roles.IsUserInRole