wpf 如何将项目设置为在组合框中选择
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How to set an item as selected in a combobox
提问by msfanboy
It seems nobody has yet found a way to set the comboboxitem as selected with a SelectedItem="Binding Property".
似乎还没有人找到将组合框项设置为 SelectedItem="Binding Property" 的方法。
Is the solution to use a IsSelected Property in the ViewModel object within the combobox itemssource?
是在组合框项目源中的 ViewModel 对象中使用 IsSelected 属性的解决方案吗？
回答by Agies
Our successful approach for binding a combobox is the following...
我们绑定组合框的成功方法如下...
<ComboBox
ItemsSource="{Binding Path=AllItems}"
SelectedItem="{Binding Path=CurrentItem, Mode=TwoWay}" />
<TextBlock Text="{Binding Path=CurrentItem, Mode=TwoWay}" />
class public ItemListViewModel
{
public ObservableCollection<Item> AllItems {get; set;}
private Item _currentItem;
public Item CurrentItem
{
get { return _currentItem; }
set
{
if (_currentItem == value) return;
_currentItem = value;
RaisePropertyChanged("CurrentItem");
}
}
}
回答by Wallstreet Programmer
Not sure why you can't data bind to SelectedItem on a ComboBox without seeing your code. Below shows you how to do it using a CollectionView which has current item management built in which comboboxes supports. CollectionView has a CurrentItem get property you can use to get currently selected.
不知道为什么不能在没有看到代码的情况下将数据绑定到 ComboBox 上的 SelectedItem。下面向您展示了如何使用 CollectionView 来完成它，该 CollectionView 内置了组合框支持的当前项目管理。CollectionView 有一个 CurrentItem 获取属性，您可以使用它来获取当前选定的内容。
XAML:
XAML：
<Window x:Class="CBTest.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
<StackPanel>
<ComboBox
ItemsSource="{Binding Path=Names}"
IsSynchronizedWithCurrentItem="True">
<ComboBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding}" />
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
<TextBlock Text="{Binding Path=Names.CurrentItem}" />
</StackPanel>
</Window>
Code behind:
后面的代码：
using System.Collections.Generic;
using System.Windows;
using System.Windows.Data;
namespace CBTest
{
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
DataContext = new VM();
}
}
public class VM
{
public VM()
{
_namesModel.Add("Bob");
_namesModel.Add("Joe");
_namesModel.Add("Sally");
_namesModel.Add("Lucy");
Names = new CollectionView(_namesModel);
// Set currently selected item to Sally.
Names.MoveCurrentTo("Sally");
}
public CollectionView Names { get; private set; }
private List<string> _namesModel = new List<string>();
}
}
