您将了解如何实施。



为用户分配角色（C＃）| Microsoft Docs [ ^ ]

You'll get an idea how to implement.

Assigning Roles to Users (C#) | Microsoft Docs[^]

您好，

尝试这样的方式

Hello,
Try something like this way

DataTable dtuserrole=new DataTable();
dtuserrole.Columns.Add("Name");
dtuserrole.Columns.Add("Role");

dtuserrole.Rows.Add("A","Admin");
dtuserrole.Rows.Add("B","Admin");
dtuserrole.Rows.Add("C","User");
dtuserrole.Rows.Add("D","User");
dtuserrole.Rows.Add("E","Stuff");
dtuserrole.Rows.Add("F","User");
dtuserrole.Rows.Add("G","Superuser");
dtuserrole.Rows.Add("H","User");
dtuserrole.AcceptChanges();

var results = (from p in dtuserrole.AsEnumerable()
               group p by new {Role=p.Field<string>("Role")}into g
      select new { Role = g.Key, Count = g.Count()});

和输出将是

and the output will be

		foreach(var dr in results)
				Console.WriteLine("Role: "+dr.Role + "; Count: "+dr.Count);

Role: { Role = Admin }; Count: 2
Role: { Role = User }; Count: 4
Role: { Role = Stuff }; Count: 1
Role: { Role = Superuser }; Count: 1

谢谢

Thanks