日期验证器，无法在C#中选择旧日期和今天的日期 [英] date validator that cannot choose old date and today date in c#

问题描述

当用户在文本框中插入所选日期时，该日期不能是旧日期或今天的日期，我可以使用什么验证规则?

When user insert the selected date in the textbox the date cannot be an old date or today date what is validation rule i can use?

我不确定要使用哪个验证器控件.

i am not sure which validator control to use either.

推荐答案

一种方法是将 CustomValidator 与 ServerValidate 一起使用，如下所示:

One way is using a CustomValidator with a ServerValidate like this:

<asp:CustomValidator runat="server"
    ID="CustDateValidator" 
    ControlToValidate="txtDate"
    onservervalidate="CustDateValidator_ServerValidate" 
    ErrorMessage="enter valid date in the future" />

隐藏代码:

protected void CustDateValidator_ServerValidate(object source, ServerValidateEventArgs args)
{
    DateTime dt;
    args.IsValid = (DateTime.TryParse(args.Value, out dt) 
                    && dt > DateTime.Today);
}

您还可以提供 <如果需要的话，可以使用code> ClientValidationFunction (具体实现由您决定).

You can also provide a ClientValidationFunctionif you want(implementation is up to you).

注意:如果输入控件为空，则不会调用任何验证函数，并且验证成功.

Note: If the input control is empty, no validation functions are called and validation succeeds.

如果您需要确保它不为空，那么您还需要一个 RequiredFieldValidator .

If you need to ensure that it's not empty then you'll need a RequiredFieldValidator too.

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