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
{
private string firstName; private string lastName; private DateTime dateOfBirth; private string email; private int rewardPoints; [StringLengthValidator(1, 50, Ruleset = "RuleSetA", MessageTemplate="First Name must be between 1 and 50 characters long")] public string FirstName
{
get { return firstName; } set { firstName = value; }
} [StringLengthValidator(1, 50, Ruleset = "RuleSetA", MessageTemplate = "Last Name must be between 1 and 50 characters long")] public string LastName { get { return lastName; } set { lastName = value; } } [RelativeDateTimeValidator(-120, DateTimeUnit.Year, -18, DateTimeUnit.Year, Ruleset = "RuleSetA", MessageTemplate="Must be 18 years old")] public DateTime DateOfBirth { get { return dateOfBirth; } set { dateOfBirth = value; } } [RegexValidator(@"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*", Ruleset = "RuleSetA")] public string Email { get { return email; } set { email = value; } } [Int32RangeValidator(0, 1000000, Ruleset = "RuleSetA", MessageTemplate = "Rewards points cannot exceed 1,000,000")] public int RewardPoints { get { return rewardPoints; } set { rewardPoints = value; } }
}2．添加PropertyProxyValidator控件。在工具箱中添加新项，选择Microsoft.Practices.EnterpriseLibrary.Validation.Integration.AspNet，默认的安装路径为C:\Program Files\Microsoft Enterprise Library 3.0 - January 2007 CTP\Bin，添加完成后可以在工具箱中看到PropertyProxyValidator控件。
3．编写ASPX页面，如下图所示：
代码如下：
<div> <h3> Validation Application Block: ASP.NET Integration QuickStart</h3> <table> <tr> <td style=" 100px"> First Name:</td> <td style=" 508px"> <asp:TextBox ID="firstNameTextBox" runat="server" Width="235px"></asp:TextBox> <br /> </td> </tr> <tr> <td style=" 100px; height: 21px"> Last Name:</td> <td style=" 508px; height: 21px"> <asp:TextBox ID="lastNameTextBox" runat="server" Width="235px"></asp:TextBox><br /> </td> </tr> <tr> <td style=" 100px"> Date Of Birth:</td> <td style=" 508px"> <asp:TextBox ID="dateOfBirthTextBox" runat="server"></asp:TextBox><br /> </td> </tr> <tr> <td style=" 100px"> E-mail:</td> <td style=" 508px"> <asp:TextBox ID="emailTextBox" runat="server" Width="235px"></asp:TextBox><br /> </td> </tr> <tr> <td style=" 100px; height: 25px;"> Rewards Points:</td> <td style=" 508px; height: 25px;"> <asp:TextBox ID="rewardsPointsTextBox" runat="server"></asp:TextBox><br /> </td> </tr> <tr> <td style=" 100px"> </td> <td style=" 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=" 100px"> First Name:</td> <td style=" 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=" 100px; height: 21px"> Last Name:</td> <td style=" 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=" 100px"> Date Of Birth:</td> <td style=" 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=" 100px"> E-mail:</td> <td style=" 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=" 100px; height: 25px;"> Rewards Points:</td> <td style=" 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=" 100px"> </td> <td style=" 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){ string value = e.ValueToConvert as string; try { e.ConvertedValue = Int32.Parse(value); } catch { e.ConversionErrorMessage = "Rewards points is not a valid integer"; e.ConvertedValue = null; }}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。