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本文介绍了asp.net CustomValidator 从不触发 OnServerValidate的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有以下 ASP 页面:
<form runat="server" id="AddNewNoteForm" method="post""><fieldset id="NoteContainer"><legend>添加新笔记</legend><asp:ValidationSummary ID="ValidationSummary1" runat="server"/><div class="ctrlHolder"><asp:Label ID="LabelNoteDate" runat="server" Text="Note Date"AssociatedControlID="NoteDateTextBox"></asp:Label><asp:TextBox ID="NoteDateTextBox" runat="server" class="textInput"CausesValidation="True" ></asp:TextBox><asp:自定义验证器ID="CustomValidator1"runat="服务器"ErrorMessage="CustomValidator"ControlToValidate="NoteDateTextBox"OnServerValidate="CustomValidator1_ServerValidate"显示=动态">*</asp:CustomValidator>
<div class="ctrlHolder"><asp:Label ID="LabelNoteText" AssociatedControlID="NoteTextTextBox" runat="server" Text="Note"></asp:Label><asp:TextBox ID="NoteTextTextBox" runat="server" Height="102px"TextMode="MultiLine" class="textInput" ></asp:TextBox><asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"ErrorMessage="Note Text is required" ControlToValidate="NoteTextTextBox">*</asp:RequiredFieldValidator>
<div class="buttonHolder"><asp:Button ID="OkButton" runat="server" Text="添加新注释"CssClass="primaryAction" onclick="OkButton_Click"/><asp:HyperLink ID="HyperLink1" runat="server">取消</asp:HyperLink>
</fieldset></表单></asp:内容>
以及用于 CustomValidator1_ServerValidate() 方法的以下代码:
protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args){if (string.IsNullOrEmpty(args.Value.Trim())){args.IsValid = false;CustomValidator1.ErrorMessage = "需要注意日期！";返回;}日期时间测试日期；if (DateTime.TryParse(args.Value, out testDate)){args.IsValid = true;CustomValidator1.ErrorMessage = "无效日期！";}}
无论我在文本框中输入什么，它似乎都不会失败...
应该说这是ASP.NET 2.0
解决方案
为了使用 customvalidator，您还需要一个 requiredfieldvalidator 用于同一控件.只需为 NoteDateTextBox 放置一个 requiredfieldvalidator ，它就会为您触发 customvalidator 的服务器事件.
I have the following ASP page:
<asp:Content ID="Content2" ContentPlaceHolderID="ShellContent" runat="server">
<form runat="server" id="AddNewNoteForm" method="post"">
<fieldset id="NoteContainer">
<legend>Add New Note</legend>
<asp:ValidationSummary ID="ValidationSummary1" runat="server" />
<div class="ctrlHolder">
<asp:Label ID="LabelNoteDate" runat="server" Text="Note Date"
AssociatedControlID="NoteDateTextBox"></asp:Label>
<asp:TextBox ID="NoteDateTextBox" runat="server" class="textInput"
CausesValidation="True" ></asp:TextBox>
<asp:CustomValidator
ID="CustomValidator1"
runat="server"
ErrorMessage="CustomValidator"
ControlToValidate="NoteDateTextBox"
OnServerValidate="CustomValidator1_ServerValidate"
Display="Dynamic"
>*</asp:CustomValidator>
</div>
<div class="ctrlHolder">
<asp:Label ID="LabelNoteText" AssociatedControlID="NoteTextTextBox" runat="server" Text="Note"></asp:Label>
<asp:TextBox ID="NoteTextTextBox" runat="server" Height="102px"
TextMode="MultiLine" class="textInput" ></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
ErrorMessage="Note Text is Required" ControlToValidate="NoteTextTextBox">*</asp:RequiredFieldValidator>
</div>
<div class="buttonHolder">
<asp:Button ID="OkButton" runat="server" Text="Add New Note"
CssClass="primaryAction" onclick="OkButton_Click"/>
<asp:HyperLink ID="HyperLink1" runat="server">Cancel</asp:HyperLink>
</div>
</fieldset>
</form>
</asp:Content>
and the following code behind for the CustomValidator1_ServerValidate() method:
protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)
{
if (string.IsNullOrEmpty(args.Value.Trim()))
{
args.IsValid = false;
CustomValidator1.ErrorMessage = "Note Date is Required!";
return;
}
DateTime testDate;
if (DateTime.TryParse(args.Value, out testDate))
{
args.IsValid = true;
CustomValidator1.ErrorMessage = "Invalid Date!";
}
}
It never seems to fail validation no matter what I put in the text box...
Should mention this is ASP.NET 2.0
解决方案
In order to use a customvalidator, you also need a requiredfieldvalidator for that same control. Just put a requiredfieldvalidator for NoteDateTextBox and it should fire the customvalidator's server event for you.
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