Enterprise Library 3.0体验（4）：Validation Application Block与ASP.NET的集成

摘要：也许大家都已经习惯了使用ASP.NET中的验证控件进行数据有效性的验证，但是验证控件的验证无法与我们的自定义的实体类结合起来，两者属于不同层面的验证。在Enterprise Library 3.0中有了Validation Application Block，可以轻松的实现页面验证与类验证的结合。

1．编写实体类，本文我使用Enterprise Library 3.0 QuickStarts中的例子，采用Atteribute验证的方式（采用配置文件来实现也是一样的），分别设置验证规则集合、错误信息提示等属性，代码如下：

public class Customer
<div>
<h3>
Validation Application Block: ASP.NET Integration QuickStart</h3>

<table>
<tr>
<td style="width: 100px">
First Name:</td>
<td style="width: 508px">
<asp:TextBox ID="firstNameTextBox" runat="server" Width="235px"></asp:TextBox> 
<br />
</td>
</tr>
<tr>
<td style="width: 100px; height: 21px">
Last Name:</td>
<td style="width: 508px; height: 21px">
<asp:TextBox ID="lastNameTextBox" runat="server" Width="235px"></asp:TextBox><br />
</td>
</tr>
<tr>
<td style="width: 100px">
Date Of Birth:</td>
<td style="width: 508px">
<asp:TextBox ID="dateOfBirthTextBox" runat="server"></asp:TextBox><br />
</td>
</tr>
<tr>
<td style="width: 100px">
E-mail:</td>
<td style="width: 508px">
<asp:TextBox ID="emailTextBox" runat="server" Width="235px"></asp:TextBox><br />
</td>
</tr>
<tr>
<td style="width: 100px; height: 25px;">
Rewards Points:</td>
<td style="width: 508px; height: 25px;">
<asp:TextBox ID="rewardsPointsTextBox" runat="server"></asp:TextBox><br />
</td>
</tr>
<tr>
<td style="width: 100px">
</td>
<td style="width: 508px">
<asp:Button ID="submitButton" runat="server" Text="Submit" OnClick="submitButton_Click" /> 
<asp:Label ID="validationResultsLabel" runat="server"></asp:Label></td>
</tr>
</table>
</div>
4．在页面上需要验证的地方添加PropertyProxyValidator控件，基本的属性设置如下：

<cc1:propertyproxyvalidator id="firstNameValidator" runat="server"

ControlToValidate="ContolToValidate"

PropertyName="PropertyName"

RulesetName="RuleSetName"

SourceTypeName="ValidationAspNetQuickStart.Customer">

</cc1:propertyproxyvalidator>
其中ControlToValidate指定对应的需要验证的控件ID，PropertyName指定在实体类中的属性名，RulesetName指定验证规则的名称，SourceTypeName指定实体类型名，当然了你也可以像验证控件一样通过Display属性来指定验证信息的显示方式：None、Static、Dynamic。PropertyProxyValidator还有一个很重要的事件OnValueConvert，在事件可以通过做类型转换根据是否抛出异常来判断输入是否正确，以及设置验证提示信息等。添加完PropertyProxyValidator后代码如下：

<div>
<h1>
Validation Application Block: ASP.NET Integration QuickStart</h1>

<table>
<tr>
<td style="width: 100px">
First Name:</td>
<td style="width: 508px">
<asp:TextBox ID="firstNameTextBox" runat="server" Width="235px"></asp:TextBox> 
<br />
<cc1:propertyproxyvalidator id="firstNameValidator" runat="server"
ControlToValidate="firstN
ameTextBox"
PropertyName="FirstName"
RulesetName="RuleSetA"
SourceTypeName="ValidationAspNetQuickStart.Customer">
</cc1:propertyproxyvalidator>
</td>
</tr>
<tr>
<td style="width: 100px; height: 21px">
Last Name:</td>
<td style="width: 508px; height: 21px">
<asp:TextBox ID="lastNameTextBox" runat="server" Width="235px"></asp:TextBox><br />
<cc1:PropertyProxyValidator ID="lastNameValidator" runat="server" ControlToValidate="lastNameTextBox"
PropertyName="LastName" RulesetName="RuleSetA" SourceTypeName="ValidationAspNetQuickStart.Customer"></cc1:PropertyProxyValidator></td>
</tr>
<tr>
<td style="width: 100px">
Date Of Birth:</td>
<td style="width: 508px">
<asp:TextBox ID="dateOfBirthTextBox" runat="server"></asp:TextBox><br />
<cc1:PropertyProxyValidator ID="dateOfBirthValidator" runat="server" ControlToValidate="dateOfBirthTextBox"
OnValueConvert="dateOfBirthValidator_ValueConvert" PropertyName="DateOfBirth"
RulesetName="RuleSetA" SourceTypeName="ValidationAspNetQuickStart.Customer"></cc1:PropertyProxyValidator></td>
</tr>
<tr>
<td style="width: 100px">
E-mail:</td>
<td style="width: 508px">
<asp:TextBox ID="emailTextBox" runat="server" Width="235px"></asp:TextBox><br />
<cc1:PropertyProxyValidator ID="emailValidator" runat="server" ControlToValidate="emailTextBox"
PropertyName="Email" RulesetName="RuleSetA" SourceTypeName="ValidationAspNetQuickStart.Customer"></cc1:PropertyProxyValidator></td>
</tr>
<tr>
<td style="width: 100px; height: 25px;">
Rewards Points:</td>
<td style="width: 508px; height: 25px;">
<asp:TextBox ID="rewardsPointsTextBox" runat="server"></asp:TextBox><br />
<cc1:PropertyProxyValidator ID="rewardPointsValidator" runat="server" ControlToValidate="rewardsPointsTextBox"
PropertyName="RewardPoints"
RulesetName="RuleSetA" SourceTypeName="ValidationAspNetQuickStart.Customer" OnValueConvert="rewardsPointsValidator_ValueConvert"></cc1:PropertyProxyValidator></td>
</tr>
<tr>
<td style="width: 100px">
</td>
<td style="width: 508px">
<asp:Button ID="submitButton" runat="server" Text="Submit" OnClick="submitButton_Click" /> 
<asp:Label ID="validationResultsLabel" runat="server"></asp:Label></td>
</tr>
</table>
</div>
5．在这里有两个验证器用到了OnValueConvert事件，对应的CS代码如下：

protected void rewardsPointsValidator_ValueConvert(object sender, Microsoft.Practices.EnterpriseLibrary.Validation.Integration.AspNet.ValueConvertEventArgs e)

protected void dateOfBirthValidator_ValueConvert(object sender, Microsoft.Practices.EnterpriseLibrary.Validation.Integration.AspNet.ValueConvertEventArgs e)
{


string value = e.ValueToConvert as string;


try




{


e.ConvertedValue = DateTime.Parse(value, System.Globalization.CultureInfo.CurrentCulture);


}


catch




{


e.ConversionErrorMessage = "Date Of Birth is not in the correct format.";


e.ConvertedValue = null;


}


}
6．运行后，输入错误的数据如下图所示：



关于Validation Application Block与ASP.NET的集成就简单得介绍到这儿。

注意本文使用的版本是Enterprise Library 3.0 January 2007 CTP版本。