ASP验证器：仅验证小写字母和大写字母

Question

<asp:Label ID="lblDriving" runat="server" CssClass="lblDriving">Driving (y/n)</asp:Label> 
<asp:TextBox ID="tbDriving" runat="server" CssClass="tbDriving"></asp:TextBox> 
<asp:RequiredFieldValidator ID="rfvDriving" runat="server" CssClass="errorAsterik" ErrorMessage="Please enter y or n in lowercase only" ControlToValidate="tbDriving">*</asp:RequiredFieldValidator> 
<asp:RangeValidator ID="rvDriving" runat="server" CssClass="errorAsterik" ErrorMessage="Please enter n or y in lower case" ControlToValidate="tbDriving" MinimumValue="n" MaximumValue="y">*</asp:RangeValidator> 

如何验证它，以便用户可以使用ASP.NET验证器输入小写字母y/n或大写字母Y/N？

Answer 1

你可以使用的RegularExpressionValidator：

<asp:RegularExpressionValidator ID="rvDriving" runat="server" 
    CssClass="errorAsterik" ErrorMessage="Please enter n or y" 
    ControlToValidate="tbDriving" 
    ValidationExpression="[yYnN]">*</asp:RegularExpressionValidator> 

Answer 2

您将不得不使用CustomValidator，因为CompareValidator与Type=String比较区分大小写。

<asp:CustomValidator id="ValidDriving" 
     ControlToValidate="tbDriving" 
     ErrorMessage="Enter y/Y or n/N" 
     OnServerValidate="ValidateDriving" 
     ClientValidationFunction="ValidateDriving_JS" 
     runat="server"/> 

服务器验证：

protected void ValidateDriving(object source, ServerValidateEventArgs args) 
{ 
    args.IsValid = StringComparer.OrdinalIgnoreCase.Equals("y", args.Value) || 
        StringComparer.OrdinalIgnoreCase.Equals("n", args.Value); 
} 

如果你也想提供一个客户方的验证功能：

function ValidateDriving_JS(sender, args){ 
    var upperVal = args.Value.toUpperCase(); 
    args.IsValid = upperVal == "Y" || upperVal == "N"; 
    return;  
}