强大的DataGrid组件[14][Final]_数据验证——Silverlight学习笔记[22]
数据验证是DataGrid应用中的重要一环。正确的数据能保证应用程序的有效。根据微软提供的资料显示，DataGrid是唯一具有自动验证数据能力的数据控件（根据业务对象的属性类型自动做出判断）。然而，这一自动验证所提供的功能仅仅是基本的。在实际应用中，我们往往需要特定格式的数据验证。本文将为大家介绍如何在DataGrid中实施数据验证。
数据验证是DataGrid应用中的重要一环。正确的数据能保证应用程序的有效。根据微软提供的资料显示，DataGrid是唯一具有自动验证数据能力的数据控件（根据业务对象的属性类型自动做出判断）。然而，这一自动验证所提供的功能仅仅是基本的。在实际应用中，我们往往需要特定格式的数据验证。本文将为大家介绍如何在DataGrid中实施数据验证。
具体步骤
1）建立业务对象
2）为对象中各成员属性通过metadata标签进行数据的验证
3）如果需要进行自定义数据验证，则需另行创建自定义验证类。
几个用于数据验证的metadata的说明
1）[Required]：表示所验证数据必须非空。
2）[RegularExpression]：用正则表达式验证数据。
3）[Range]：对于被验证数据的最值范围进行设定。
4）[CustomValidation]：用于自定义验证数据的设置。
实例
详细的说明在代码中给出。
注意：用VS调试时，要在菜单Debug->Exception...，去掉Common Language Runtime Exception前面的勾，不然会报错。
1）业务类Employees.cs文件：
using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
namespace SilverlightClient
{
public class Employees: INotifyPropertyChanged
{
private int _EmployeeID;
private string _EmployeeName;
private int _EmployeeAge;
private string _EmployeeTelephone;
[Required(ErrorMessage="该字段为必填！")]
[CustomValidation(typeof(EmployeeValidation), "IsValidID")]//这里用到了自定义验证，自定义验证类为EmployeeValidation.cs
public int EmployeeID
{
get
{
return _EmployeeID;
}
set
{
if (value != _EmployeeID)
{
_EmployeeID = value;
OnPropertyChanged("EmployeeID");
}
}
}
[Required(ErrorMessage = "该字段为必填！")]
public string EmployeeName
{
get
{
return _EmployeeName;
}
set
{
if (value != _EmployeeName)
{
_EmployeeName = value;
OnPropertyChanged("EmployeeName");
}
}
}
[Required(ErrorMessage = "该字段为必填！")]
[Range(18,60,ErrorMessage = "输入的年龄范围有误(18-60)！\n请重新填写。")]
public int EmployeeAge
{
get
{
return _EmployeeAge;
}
set
{
if (value != _EmployeeAge)
{
_EmployeeAge = value;
OnPropertyChanged("EmployeeAge");
}
}
}
[Required(ErrorMessage = "该字段为必填！")]
[RegularExpression(@"^\(\d\d\d\) \d\d\d\d\d\d\d\d$",ErrorMessage = "输入的电话格式不正确！\n请按(###) ########格式匹配输入。")]
public string EmployeeTelephone
{
get
{
return _EmployeeTelephone;
}
set
{
if (value != _EmployeeTelephone)
{
//用VS调试时，要在菜单Debug->Exception...，去掉Common Language Runtime Exception前面的勾，不然会报错。
Validator.ValidateProperty(value, new ValidationContext(this,null,null) { MemberName = "EmployeeTelephone" });//跳出提示框显示出错原因
_EmployeeTelephone = value;
OnPropertyChanged("EmployeeTelephone");
}
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propName));
}
}
#endregion
}
}
2）自定义验证类EmployeeValidation.cs文件：
using System.ComponentModel.DataAnnotations;
namespace SilverlightClient
{
public class EmployeeValidation
{
public static ValidationResult IsValidID(int employeeid)
{
bool isValid;
if (employeeid > 0)
isValid = true;
else
isValid = false;
if (isValid)
{
return ValidationResult.Success;
}
else
{
return new ValidationResult("输入的工号无效！");
}
}
}
}
3）MainPage.xaml文件
<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data" x:Class="SilverlightClient.MainPage"
d:DesignWidth="320" d:DesignHeight="240">
<Grid x:Name="LayoutRoot" Background="White" Width="320" Height="240">
<data:DataGrid x:Name="dgEmployee" Margin="8" AutoGenerateColumns="False" FontSize="14">
<data:DataGrid.Columns>
<data:DataGridTextColumn Header="工号" Binding="{Binding EmployeeID}"/>
<data:DataGridTextColumn Header="姓名" Binding="{Binding EmployeeName}"/>
<data:DataGridTextColumn Header="年龄" Binding="{Binding EmployeeAge}"/>
<data:DataGridTextColumn Header="电话" Binding="{Binding EmployeeTelephone}"/>
</data:DataGrid.Columns>
</data:DataGrid>
</Grid>
</UserControl>
4）MainPage.xaml.cs文件
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Data;
namespace SilverlightClient
{
public partial class MainPage : UserControl
{
public List<Employees> GetEmployees()
{
List<Employees> returnedValue = new List<Employees>();
returnedValue.Add(new Employees() { EmployeeID = 1, EmployeeName = "张三", EmployeeAge = 23, EmployeeTelephone = "(001) 56891243" });
returnedValue.Add(new Employees() { EmployeeID = 2, EmployeeName = "李四", EmployeeAge = 24, EmployeeTelephone = "(002) 67453210" });
returnedValue.Add(new Employees() { EmployeeID = 3, EmployeeName = "王五", EmployeeAge = 25, EmployeeTelephone = "(010) 46782312" });
returnedValue.Add(new Employees() { EmployeeID = 4, EmployeeName = "赵六", EmployeeAge = 26, EmployeeTelephone = "(011) 78564254" });
returnedValue.Add(new Employees() { EmployeeID = 5, EmployeeName = "钱七", EmployeeAge = 27, EmployeeTelephone = "(020) 87465676" });
returnedValue.Add(new Employees() { EmployeeID = 6, EmployeeName = "孙八", EmployeeAge = 28, EmployeeTelephone = "(030) 97321687" });
return returnedValue;
}
public MainPage()
{
InitializeComponent();
this.Loaded += new RoutedEventHandler(MainPage_Loaded);
}
void MainPage_Loaded(object sender, RoutedEventArgs e)
{
dgEmployee.ItemsSource = GetEmployees();
}
}
}
最终效果图
文章出处：Kinglee’s Blog (http://www.cnblogs.com/Kinglee/)
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