WPF Gridview複選框列標題MVVM

Question

我仍然圍繞着這整個MVVM模式，但我認爲我有一個很好的把握，直到我試圖爲我的Gridview創建一個複選框列。我需要用戶能夠選擇列出的所有項目（通過標題複選框）或選擇單獨列出的項目。我將我的複選框的IsChecked屬性綁定到我的viewmodel上的兩個布爾字段。單元格模板上的複選框按預期工作，並觸發屬性更改的事件。標題什麼都不做。我在這裏錯過了什麼。再次，這對我來說仍然是新的，所以要溫柔。此外，如果有什麼我應該做的，或更好的方式來實現這一目標......所有的耳朵。

由於

XAML

<UserControl x:Class="CheckBoxDemo.GridDemo" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
     mc:Ignorable="d" 
     d:DesignHeight="300" d:DesignWidth="300"> 
<Grid> 
    <ListView ItemsSource="{Binding PersonList}"> 
     <ListView.View> 
      <GridView> 
       <GridViewColumn Width="50"> 
        <GridViewColumn.HeaderTemplate> 
         <DataTemplate> 
          <CheckBox IsChecked="{Binding IsMainSelected}"/> 
         </DataTemplate> 
        </GridViewColumn.HeaderTemplate> 
        <GridViewColumn.CellTemplate> 
         <DataTemplate> 
          <CheckBox IsChecked="{Binding IsSelected}"/> 
         </DataTemplate> 
        </GridViewColumn.CellTemplate> 
       </GridViewColumn> 
       <GridViewColumn Header="Name" DisplayMemberBinding="{Binding Name}" Width="100"></GridViewColumn> 
      </GridView> 
     </ListView.View> 


    </ListView> 
</Grid> 

視圖模型

class GridDemoViewModel:INotifyPropertyChanged 
{ 
    public List<Person> PersonList { get; private set; } 
    // Fields... 
    private bool _isMainSelected; 

    public bool IsMainSelected 
    { 
     get { return _isMainSelected; } 
     set 
     { 
      _isMainSelected = value; 
      NotifyPropertyChanged("IsMainSelected"); 

     } 
    } 

    public GridDemoViewModel() 
    { 
     PersonList = new List<Person>(); 
     PersonList.Add(new Person { Name = "John"}); 
     PersonList.Add(new Person { Name = "Tom" }); 
     PersonList.Add(new Person { Name = "Tina" }); 
     PersonList.Add(new Person { Name = "Mary" }); 
     PersonList.Add(new Person { Name = "Mia"}); 
     PersonList.Add(new Person { Name = "Crystal" }); 


    } 
    public event PropertyChangedEventHandler PropertyChanged; 
    private void NotifyPropertyChanged(String info) 
    { 
     if (PropertyChanged != null) 
     { 
      PropertyChanged(this, new PropertyChangedEventArgs(info)); 
     } 
    } 
} 

人類

public class Person:INotifyPropertyChanged 
{ 
    public string Name { get; set; } 
    // Fields... 
    private bool _isSelected; 

    public bool IsSelected 
    { 
     get { return _isSelected; } 
     set 
     { 
      if (_isSelected == value) 
       return; 
      _isSelected = value; 
      NotifyPropertyChanged("IsSelected"); 
     } 
    } 

    public event PropertyChangedEventHandler PropertyChanged; 
    private void NotifyPropertyChanged(String info) 
    { 
     if (PropertyChanged != null) 
     { 
      PropertyChanged(this, new PropertyChangedEventArgs(info)); 
     } 
    } 
} 

Answer 1

問題是GridViewColumn不是Visual Tree的一部分。這意味着它不會繼承父級ListView的DataContext。你必須找到一些其他的方法來引用ViewModel。 Check out Josh Smith's DataContextSpy，讓您可以輕鬆地引入「人爲繼承」的DataContext的鏈接

<UserControl.Resources> 
    <spy:DataContextSpy x:Key="Spy" /> 
</UserControl.Resources> 

<DataTemplate> 
    <CheckBox IsChecked="{Binding Source={StaticResource Spy} Path=DataContext.IsMainSelected}"/> 
</DataTemplate>