string InRoles = "1;2;3;4";//得到角色
                StringBuilder sb = new StringBuilder();
                foreach (var item in InRoles.Split(';'))
                {
                    switch (item)
                    {
                        case "1":
                            sb.Append("管理员;");
                            break;
                        case "2":
                            sb.Append("普通用户;");
                            break;
                    }
                }
                string _result = sb.ToString().TrimEnd(';');//管理员;普通用户

------解决方案--------------------

C# code


public string GetRole(string InRoles)
    {
        string roles = "";
        foreach (string role in InRoles.Split(';'))
        {
            switch (role)
            {
                case "1":
                    roles += "管理员角色;";
                    break;
                case "2":
                    roles += "普通用户;";
                    break;
                case "3":
                    roles += "录入人员;";
                    break;
                case "4":
                    roles += "编辑人员;";
                    break;
                case "5":
                    roles += "审核人员;";
                    break;
                case "6":
                    roles += "签发人员;";
                    break;

            }
        }
        return  roles.subString(0,roles.length-1);
    }