文本框中的值如何在 c# mvc 中是字符串或数字

Question

我有用户名和密码文本框，我想检查用户何时输入任何登录名，登录名是字符串还是数字。如果登录名是字符串，则此函数调用其他函数调用。**Login Function** public DataTable mlogin(string username, string password)                {                    string constring = ConfigurationManager.ConnectionStrings["Real"].ConnectionString;                        using (SqlConnection con = new SqlConnection(constring))                        {                            password = Cryptographer.Encrypt(password);                            con.Open();                            using (SqlCommand cmd = new SqlCommand("select MD.MembershipID, MembershipName, address, ISNULL(FD.FileID,'') as FileID,ISNULL(Sec.SectorName, '') as SectorName, ISNULL(I.PlotNo, '') as PlotNo, MD.ClientPic from MemberMaster MM " +                                                                        " inner join MembersDetail MD on MD.MemberShipID = MM.MemberShipID and MD.Srno = 1 " +                                                                        " inner join MasterFileDetail FD on FD.MembershipID = MM.MemberShipID and FD.IsOwner = 1 and FD.IsTransfered = 1 " +                                                                        " inner join MasterFile FM on FM.FileID = FD.FileID and FM.Cancel = 0 " +                                                                        " inner join Sectors Sec on Sec.Phase_ID = FM.PhaseId and Sec.Sector_ID = FM.Sector_ID " +                                                                        " inner join PlotsInventory I on I.Phase_ID = FM.PhaseId and I.Plot_ID = FM.Plot_ID " +                                                                   " where MM.MemberShipID = '" + username + "' and MM.IsApproved = 1 and RTRIM(MM.LoginPwd) = '" + password + "' and MM.IsActive = 1 " +                                                                   " order by FD.FileID", con)                            }                        }      }

Answer 1

如果您需要在 Controller-Action 级别做出此决定，请创建一个属性：

public class SelectorAttribute : ActionMethodSelectorAttribute

    {

        public override bool IsValidForRequest(ControllerContext controllerContext, MethodInfo methodInfo)

        {

            int a;

            return int.TryParse((string)controllerContext.HttpContext.Request.QueryString["username"], out a);

        }

    }

并有两个动作定义为：

[Selector]

public ActionResult Login(int username, string password)

{

    //Code here

}

和

public ActionResult Login(string username, string password)

{

    //Code here

}

希望能帮助到你。干杯..

Answer 2

您可以使用：

bool result = Int32.TryParse(username, out number);

if (result)

{

    //call other function      

}

else{

    //call mLogin

}