因为你可以从这里开始验证部分：http://codeblitz.wordpress.com/2009/05/08/wpf-validation-made-easy-with-idataerrorinfo/
后你理解文章，你可以修改你的类是这样的： 例如，让我们添加的职位和工作开始日期非空标题验证：
作业类：
public class Job : IDataErrorInfo
{
public string Title { get; set; }
public DateTime? Start { get; set; }
public DateTime? End { get; set; }
public string Error
{
get { throw new NotImplementedException(); }
}
public string this[string columnName]
{
get
{
string result = null;
if (columnName == "Title")
{
if (string.IsNullOrEmpty(Title))
result = "Please enter a Title ";
}
if (columnName == "Start")
{
if (Start == null)
result = "Please enter a Start Date";
else if (Start > End)
{
result = "Start Date must be less than end date";
}
}
return result;
}
}
}
//////////假设我们使用了一种叫做主窗口窗口，供您XAML代码它看起来像 MainWindow.xaml
个
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525"
x:Name="mainWindow">
<Window.Resources>
<ControlTemplate x:Key="errorTemplate">
<DockPanel LastChildFill="true">
<Border Background="Red" DockPanel.Dock="right" Margin="5,0,0,0" Width="20" Height="20" CornerRadius="10"
ToolTip="{Binding ElementName=customAdorner, Path=AdornedElement.(Validation.Errors)[0].ErrorContent}">
<TextBlock Text="!" VerticalAlignment="center" HorizontalAlignment="center" FontWeight="Bold" Foreground="white">
</TextBlock>
</Border>
<AdornedElementPlaceholder Name="customAdorner" VerticalAlignment="Center" >
<Border BorderBrush="red" BorderThickness="1" />
</AdornedElementPlaceholder>
</DockPanel>
</ControlTemplate>
</Window.Resources>
<Grid>
<StackPanel Orientation="Horizontal">
<ListView ItemsSource="{Binding}" Width="200" DisplayMemberPath="Name" IsSynchronizedWithCurrentItem="True" IsEnabled="{Binding ElementName=mainWindow, Path=FormHasNoNoErrors}"/>
<DockPanel Width="200" Margin="10,0">
<TextBox Text="{Binding Name}" DockPanel.Dock="Top" Margin="0,0,0,10"/>
<ListView ItemsSource="{Binding Jobs}" Name="_jobList" DisplayMemberPath="Title" IsSynchronizedWithCurrentItem="True" IsEnabled="{Binding ElementName=mainWindow, Path=FormHasNoNoErrors}" />
</DockPanel>
<StackPanel Width="200" DataContext="{Binding ElementName=_jobList, Path=SelectedItem}">
<TextBox Text="{Binding Title, ValidatesOnDataErrors=true, NotifyOnValidationError=true}" Validation.Error="Validation_OnError" Validation.ErrorTemplate="{StaticResource errorTemplate}"/>
<DatePicker SelectedDate="{Binding Start, ValidatesOnDataErrors=true, NotifyOnValidationError=true}" Validation.Error="Validation_OnError" Validation.ErrorTemplate="{StaticResource errorTemplate}"/>
<DatePicker SelectedDate="{Binding End}"/>
</StackPanel>
</StackPanel>
</Grid>
</Window>
////////MainWindow.xaml.cs
public partial class MainWindow : Window, INotifyPropertyChanged
{
public MainWindow()
{
var jobs1 = new ObservableCollection<Job>()
{
new Job() {Start = DateTime.Now, End = DateTime.Now.AddDays(1), Title = "Physical Enginer"},
new Job() {Start = DateTime.Now, End = DateTime.Now.AddDays(1), Title = "Mechanic"}
};
var jobs2 = new ObservableCollection<Job>()
{
new Job() {Start = DateTime.Now, End = DateTime.Now.AddDays(1), Title = "Doctor"},
new Job() {Start = DateTime.Now, End = DateTime.Now.AddDays(1), Title = "Programmer"}
};
var personList = new ObservableCollection<Person>()
{
new Person() {Name = "john", Jobs = jobs1},
new Person() {Name="alan", Jobs=jobs2}
};
this.DataContext = personList;
InitializeComponent();
}
private void Validation_OnError(object sender, ValidationErrorEventArgs e)
{
if (e.Action == ValidationErrorEventAction.Added)
NoOfErrorsOnScreen++;
else
NoOfErrorsOnScreen--;
}
public bool FormHasNoNoErrors
{
get { return _formHasNoErrors; }
set
{
if (_formHasNoErrors != value)
{
_formHasNoErrors = value;
PropertyChanged(this, new PropertyChangedEventArgs("FormHasNoErrors"));
}
}
}
public int NoOfErrorsOnScreen
{
get { return _noOfErrorsOnScreen; }
set
{
_noOfErrorsOnScreen = value;
FormHasNoNoErrors = _noOfErrorsOnScreen == 0 ? true : false;
}
}
private int _noOfErrorsOnScreen = 0;
private bool _formHasNoErrors = true;
public event PropertyChangedEventHandler PropertyChanged = delegate {};
}
//////////////////////
我想验证工作 场，使得用户不能选择 另一个工作（或个人）如果标题 为空或 同一个人中的重复，或者如果日期是出 Ø f命令。此外，如果姓名为 为空，则不能更改人员 。
一个简单的解决方案是，如果表单有错误（这是我在上面的代码中做的），禁用列表框，并在没有错误时启用它们。另外你也许应该在工具提示上放一个漂亮的红色边框，解释用户为什么不能再选择。
为验证标题是否在同一个人中重复，可以扩展上面的验证机制以使ValidationService类接收一个Person并查看拥有该作业的人是否也具有另一个具有相同名称的人。
公共类人：IDataErrorInfo的 {
public string this[string columnName]
{
get
{
//look inside person to see if it has two jobs with the same title
string result = ValidationService.GetPersonErrors(this);
return result;
}
...
}
而且，我结合确定我设置 的方式在DataContext像 的最后一个面板上？它的工作原理，但它略微感觉有点 。替代方案是为 CollectionDataSources声明 资源，并且我不能 实际上很容易将该方法排除在外 。
这不是在MVVM精神，如果你正在做什么，将是东西比一个小的测试项目，你应该尝试学习MVVM更多（你可以从这里开始：http://fernandomachadopirizen.wordpress.com/2010/06/10/a-simple-introduction-to-the-model-view-viewmodel-pattern-for-building-silverlight-and-windows-presentation-foundation-applications/）然后
你不会直接绑定到人员列表，而是您将拥有一些您绑定的MainWindowViewModel类。这个MainWindowViewModel类将包含人员列表，您将绑定到该列表。 而对于选择，你会在你的MainWindowViewModel一个CurrentJob特性，那就是当前选择的工作，你会绑定到：
基本上是这样的：
<StackPanel Orientation="Horizontal">
<ListView ItemsSource="{Binding PersonList}" SelectedItem="{Binding CurrentPerson, Mode=TwoWay}" Width="200" DisplayMemberPath="Name" IsSynchronizedWithCurrentItem="True" IsEnabled="{Binding ElementName=mainWindow, Path=FormHasNoNoErrors}"/>
<DockPanel Width="200" Margin="10,0">
<TextBox Text="{Binding Name}" DockPanel.Dock="Top" Margin="0,0,0,10"/>
<ListView ItemsSource="{Binding Jobs}" SelectedItem="{Binding CurrentJob, Mode=TwoWay}", DisplayMemberPath="Title" IsSynchronizedWithCurrentItem="True" />
</DockPanel>
<StackPanel Width="200">
<TextBox Text="{Binding CurrentJob.Title}"/>
.....
</StackPanel>
</StackPanel>
而且你MainWindowViewModel：
public class MainWindowViewModel :
{
...
//Public Properties
public ObservableCollection<Person> PersonList ....
public Job CurrentJob ....
....
}
我已经尝试在我的数据类中实现IDataErrorInfo，并将ValidatesOnDataErrors = True放入我的绑定中。这正确地突出显示错误的字段，但不会阻止导航。 – captncraig 2011-04-08 19:13:43