[英]WPF, TabControl and Binding
在放置在TabControl中的TextBox控件中,我得到了一個奇怪的行為。
當我更改TextBox控件的值並且不更改焦點時,在更改選項卡上,我松開了此TextBox中的更改。
當我更改焦點並更改選項卡時-所有內容均已保存。
請參閱示例gif:
這是我的代碼:
XAML:
<Window x:Class="TabPanelTest.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">
<Grid>
<TabControl Name="tabs" ItemsSource="{Binding}">
<TabControl.ContentTemplate>
<DataTemplate>
<StackPanel Background="{Binding ContainterColor}">
<TextBox Text="{Binding Val1, Mode=TwoWay}" Margin="20 10"/>
<TextBox Text="{Binding Val2, Mode=TwoWay}" Margin="20 10"/>
<TextBox Text="{Binding Val3, Mode=TwoWay}" Margin="20 10"/>
</StackPanel>
</DataTemplate>
</TabControl.ContentTemplate>
</TabControl>
</Grid>
</Window>
后面的代碼:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace TabPanelTest
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
MyClass myObj1 = new MyClass("Tab1");
MyClass myObj2 = new MyClass("Tab2");
myObj1.ContainterColor = new SolidColorBrush(Colors.LightGreen);
myObj2.ContainterColor = new SolidColorBrush(Colors.LightBlue);
myObj1.Val1 = "Tab1 Val1";
myObj1.Val2 = "Tab1 Val2";
myObj1.Val3 = "Tab1 Val3";
myObj2.Val1 = "Tab2 Val1";
myObj2.Val2 = "Tab2 Val2";
myObj2.Val3 = "Tab2 Val3";
InitializeComponent();
tabs.DataContext = new MyClass[] { myObj1, myObj2 };
tabs.SelectedIndex = 0;
}
}
public class MyClass: INotifyPropertyChanged
{
public string Name { get; set; }
Brush _containerColor;
string val1;
string val2;
string val3;
public Brush ContainterColor
{
get
{
return _containerColor;
}
set
{
if(value!=_containerColor)
{
_containerColor = value;
OnPropertyChanged("ContainterColor");
}
}
}
public string Val1
{
get
{
return val1;
}
set
{
if (value != val1)
{
val1 = value;
OnPropertyChanged("Val1");
}
}
}
public string Val2
{
get
{
return val2;
}
set
{
if (value != val2)
{
val2 = value;
OnPropertyChanged("Val2");
}
}
}
public string Val3
{
get
{
return val3;
}
set
{
if (value != val3)
{
val3 = value;
OnPropertyChanged("Val3");
}
}
}
public override string ToString()
{
return Name;
}
public MyClass(string name)
{
Name = name;
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
}
如果沒有更改焦點,我需要怎么做才能保存更改?
非常感謝!
更新:
非常感謝@ mm8和@Fruchtzwerg!
很簡單的事情... :)
嘗試將綁定的UpdateSourceTrigger
設置為PropertyChanged
:
<TextBox Text="{Binding Val1, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Margin="20 10"/>
這將強制在TextBox
失去焦點之前立即設置屬性。 默認值為LostFocus
。
您需要將綁定的UpdateSourceTrigger
設置為PropertyChanged
以便在失去焦點之前更新屬性,例如:
<TextBox Text="{Binding Val, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
默認情況下,焦點丟失后,將更新TextBox
的綁定text屬性。 此時切換選項卡意味着更改丟失。 將UpdateSourceTrigger
設置為PropertyChanged
在更改字符后立即更新屬性。
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