[英]c# wpf combobox binding source to one collection and item as property of another collection
我試圖將combobox
的itemssource
綁定到對象( Source1
)集合的屬性,再DataGridTemplateColumn
到DataGrid
的DataGridTemplateColumn
中另一個對象( MyCollection
)的屬性:
視圖:
<Window x:Class="TestWPF.MainWindow"
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"
xmlns:local="clr-namespace:TestWPF"
mc:Ignorable="d"
Title="Test WPF" Height="350" Width="525">
<Window.DataContext>
<local:ViewModel></local:ViewModel>
</Window.DataContext>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Label Content="Testing DATAGRIDTEMPLATECOLUMN with COMBOBOX" FontFamily="Verdana" FontSize="16" Grid.Column="0" Grid.Row="0"/>
<DataGrid Grid.Column="0" Grid.Row="1" ItemsSource="{Binding MyCollection}" CanUserAddRows="True" AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Name}" Header="Name of person"/>
<DataGridTemplateColumn Header="Age of person" >
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Grid>
<ComboBox ItemsSource="{Binding Path=DataContext.Source1,
RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Window}}"
SelectedValue="{Binding Age}" DisplayMemberPath="Number"/>
</Grid>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTextColumn Binding="{Binding Salary}" Header="Persons salary"/>
</DataGrid.Columns>
</DataGrid>
<!-- Just for checking -->
<DataGrid Grid.Column="0" Grid.Row="2" ItemsSource="{Binding MyCollection}" CanUserAddRows="True" AutoGenerateColumns="True"/>
</Grid>
</Window>
ViewModel(模型(包括其余的視圖類)):
using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Windows;
namespace TestWPF
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
ViewModel vm;
public MainWindow()
{
InitializeComponent();
}
}
public class ViewModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(String info)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
}
}
private ObservableCollection<MyClass> _myCollection;
private ObservableCollection<Source1> _source1;
public ObservableCollection<Source1> Source1
{
get { return _source1; }
set { _source1 = value; }
}
public ViewModel()
{
_source1 = new ObservableCollection<TestWPF.Source1>();
_myCollection = new ObservableCollection<MyClass>();
SetupSource();
}
private void SetupSource()
{
_source1.Add(new TestWPF.Source1(2));
_source1.Add(new TestWPF.Source1(3));
_source1.Add(new TestWPF.Source1(5));
_source1.Add(new TestWPF.Source1(8));
}
public ObservableCollection<MyClass> MyCollection
{
get { return _myCollection; }
set { _myCollection = value; NotifyPropertyChanged(nameof(MyCollection)); }
}
}
}
最后是Source1類:
namespace TestWPF
{
public class Source1
{
public int Number { get; set; }
public Source1(int n)
{
Number = n;
}
}
}
和MyClass:
namespace TestWPF
{
public class MyClass
{
public string Name { get; set; }
public int Age { get; set; }
public double Salary { get; set; }
public MyClass()
{
}
public MyClass(string n, int a, double s)
{
Name = n;
Age = a;
Salary = s;
}
}
}
當我運行此程序時,我得到了錯誤和建議,以為Source1創建一個轉換器到System.Int32
。 我認為ComboBox
的SelectedValue="{Binding Age}"
會將MyClass
的年齡連接到DisplayedMemberPath
。 是否可以通過這種方式連接兩個不同類的兩個屬性,還是有必要創建一個轉換器? 我想創建一個read-only
屬性,該屬性將使用Linq從Source1集合中返回Source1.Number
的列表, Source1.Number
其用作combobox
的Itemssource
,但我想知道與使用轉換器相比,這是否是不好的做法?
我認為您的問題是因為您沒有在組合中設置所需的所有屬性。
嘗試
<ComboBox ItemsSource="{Binding Path=DataContext.Source1,
RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Window}}"
SelectedValue="{Binding Age}"
SelectedValuePath="Number"
DisplayMemberPath="Number"/>
Source1可能只有一個屬性,但是組合框不是智能的,因此它試圖將一個int設置為Source1的一個實例,而不是一個int。
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