c# – 如何将PrincipalContext与MVC Web应用程序一起使用

System.DirectoryServices.AccountManagement

我收到一个错误：

Error   1   The type or namespace name 'DirectoryServices' does not exist in the namespace 'System' (are you missing an assembly reference?)

我错过了哪个装配以及如何在项目中添加它？

// set up domain context
        PrincipalContext ctx = new PrincipalContext(ContextType.Domain);

        // find a user
        UserPrincipal user = UserPrincipal.FindByIdentity(ctx,"SomeUserName");

        if (user != null)
        {
            // do something here.... 
            string givenName = user.GivenName;
        }