ASP.NET WebForms:短路验证 [英] ASP.NET WebForms: Short-circuit validation

问题描述

我有一个正在验证的网格文本框:

I have a grid text box that I am validating:

<telerik:RadTextBox ID="txtMerchMin" runat="server" Text='<%# Bind("MerchandiseMinimumAmount") %>'></telerik:RadTextBox>
                    <asp:RequiredFieldValidator ID="required" runat="server" ErrorMessage="* required" ControlToValidate="txtMerchMin"></asp:RequiredFieldValidator>
                    <asp:CompareValidator runat="server" ID="isNumbers" Type="Double" Operator="DataTypeCheck" ControlToValidate="txtMerchMin" ErrorMessage="* must be numeric" />
                    <asp:CompareValidator runat="server" ID="IsNonNegative" Type="Double" Operator="GreaterThanEqual" ControlToValidate="txtMerchMin" AmountToCompare="0" ErrorMessage="* should be non-negative"/>
                    <asp:CompareValidator ID="isLessThanMax" ControlToValidate="txtMerchMin" Type="Double" ControlToCompare="txtMerchMax" Operator="LessThan" Text="* should be less than max" runat="server"></asp:CompareValidator>

我希望验证按以下顺序运行并且行为如下:

I would like the validations to run in the following order and behave like so:

1. 如果 required 验证失败，则仅显示 required 的错误消息.
2. 如果 isNumbers 验证失败，则仅显示 isNumber 的错误消息.
3. 如果 isNonNegative 验证失败，则仅显示 isNonNegative 的错误消息.
4. 如果 isLessThanMax 验证失败，显示 isLessThanMax 的错误仅消息.

由于现在写的代码，当txtMerchMin中的值为非数字时，我同时看到isNumbers、isNonNegative和isLessThanMax的错误信息.

As the code is written right now, when the value in txtMerchMin is non-numbers, I see the error message of isNumbers, isNonNegative, and isLessThanMax all at the same time.

有什么方法可以短路"验证以获得我的预期行为?

推荐答案

只需制作一个在服务器端工作的 CustomValidator 并使用 if/else 语句来实现您的行为.例如:

Just make a CustomValidator that works on serverside and using if/else statements achieve your behaviour. For example:

<telerik:RadTextBox ID="txtMerchMin" runat="server" Text='<%# Bind("MerchandiseMinimumAmount") %>'></telerik:RadTextBox>
    <asp:RequiredFieldValidator ID="required" runat="server" ErrorMessage="* required" ControlToValidate="txtMerchMin"></asp:RequiredFieldValidator>
    <asp:CustomValidator runat="server" ID="customValidator" Display="Dynamic" SetFocusOnError="true" ControlToValidate="txtMerchMin"></asp:CustomValidator>

在 init 方法集后面的代码中(您也可以在标记中执行此操作)

In code behind in init method set (you can do this also in markup)

customValidator.ServerValidate += new ServerValidateEventHandler(customValidator_ServerValidate);

然后在函数中实现你的逻辑:

And then in function implement your logic:

protected void customValidator_ServerValidate(object source, ServerValidateEventArgs args)
{
    bool isValid = true;

    double price;
    bool isDouble = Double.TryParse(args.Value, out price);
    if(!isDouble) {
      // not double (numeric)
      isValid = false;
    }
    else if (...)
    else if (...)

    args.IsValid = isValid;
}

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