有什麼不對這些代碼時,Validation.Error是從來沒有發射,而我setthe和NotifyOnValidationError屬性真。因此,該方法 「Grid_Error(對象發件人,ValidationErrorEventArgs E)」 永遠不會執行,但我不知道爲什麼:(WPF有效性規則和Validation.Error不會引發事件
<Window xmlns:my="clr-namespace:WpfDigitalClock;assembly=WpfDigitalClock" x:Class="WpfApplication1.MainWindow"
xmlns:local="clr-namespace:WpfApplication1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<local:Names x:Key="MyNames" />
</Window.Resources>
<Grid Validation.Error="Grid_Error">
<TextBox Height="21" Margin="12,62,0,0" Name="TextBox1" VerticalAlignment="Top" HorizontalAlignment="Left" Width="120">
<TextBox.Text>
<Binding Source="{StaticResource MyNames}" Path="FirstName" NotifyOnValidationError="True">
<Binding.ValidationRules>
<local:StringValidator />
</Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>
<TextBox Height="21" HorizontalAlignment="Right" Margin="0,62,12,0" Name="TextBox2" VerticalAlignment="Top" Width="120" >
<TextBox.Text>
<Binding Source="{StaticResource MyNames}" Path="LastName" NotifyOnValidationError="True">
<Binding.ValidationRules>
<local:StringValidator />
</Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>
<Button HorizontalAlignment="Left" Margin="35,122,0,116" Name="Button1" Width="75" Click="Button1_Click">Back</Button>
<Button HorizontalAlignment="Right" Margin="0,122,34,117" Name="Button2" Width="75" Click="Button2_Click">Forward</Button>
<Button Height="22" Margin="101,0,101,56" Name="Button3" VerticalAlignment="Bottom" Click="Button3_Click">Add</Button>
</Grid>
在Window1.xaml.cs文件
:
public class StringValidator : ValidationRule
{
public override ValidationResult Validate(object value,
System.Globalization.CultureInfo cultureinfo)
{
string aString = value.ToString();
if (aString == "")
return new ValidationResult(false, "String cannot be null");
return new ValidationResult(true, null);
}
}
private void Grid_Error(object sender, ValidationErrorEventArgs e)
{
if(e.Action == ValidationErrorEventAction.Added)
MessageBox.Show(e.Error.ErrorContent.ToString());
}
謝謝您的幫助
編輯:
這裏我的名字類別:
class Names : ObservableCollection<Name>
{
public Names()
{
Name aName = new Name("FirstName " + (this.Count +1).ToString(),
"LastName " + (this.Count + 1).ToString());
this.Add(aName);
}
}
這裏我的名類:
class Name : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private string _firstName;
private string _lastName;
public Name(string fName, string lName)
{
_firstName = fName;
_lastName = lName;
}
public string FirstName
{
get
{
return _firstName;
}
set
{
_firstName = value;
PropertyChanged(this, new PropertyChangedEventArgs("FirstName"));
}
}
public string LastName
{
get
{
return _lastName;
}
set
{
_lastName = value;
PropertyChanged(this, new PropertyChangedEventArgs("LastName"));
}
}
}
文本框是否顯示錯誤(默認情況下爲紅色邊框)? – 2011-05-03 08:47:20
什麼都沒有出現...... :( – Florian 2011-05-03 08:57:06
你怎麼最終修復它? – DasDas 2015-05-18 14:20:45