如何要求字段验证不在asp.net 4.0中选择dropdownlist的值 [英] how to require field validation not select value of dropdownlist in asp.net 4.0

问题描述

如何要求字段验证未在asp.net 4.0中选择dropdownlist的值?

how to require field validation not select value of dropdownlist in asp.net 4.0?

推荐答案

根据我的理解，您想验证值是否为在下拉列表中选择.在这种情况下，您可以使用 RequiredFieldValidator [ ^ ].如果您只是搜索，有很多示例.以下是我发现有用的一些内容.

http://forums.asp.net/t/1296491.aspx/1 [ ^ ]
http://stackoverflow.com/questions/5310609/dropdownlist- validate-in-asp-net-using-required-field-validator [ http://asp-net-example.blogspot.com/2008/10/dropdownlist-example-how-to-validate.html [

From what I understand, you want to validate if a value has been selected on the Dropdownlist. In that case, you can use a RequiredFieldValidator[^]. There are plenty of examples if you just search. Here are just few of those I found useful.

http://forums.asp.net/t/1296491.aspx/1[^]
http://stackoverflow.com/questions/5310609/dropdownlist-validation-in-asp-net-using-required-field-validator[^]
http://asp-net-example.blogspot.com/2008/10/dropdownlist-example-how-to-validate.html[^]

这可能对您有帮助
http://www.dreamincode.net/forums/topic/153597-requiredfieldvalidator-wont -validate-dropdownlist/ [ ^ ]

http://www.java2s.com/Tutorial/ASP.NET/0160__Validation/ValidatingDropDownListswithRequiredFieldValidatorControl.htm [ ^ ]

This may help you
http://www.dreamincode.net/forums/topic/153597-requiredfieldvalidator-wont-validate-dropdownlist/[^]

http://www.java2s.com/Tutorial/ASP.NET/0160__Validation/ValidatingDropDownListswiththeRequiredFieldValidatorControl.htm[^]

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