Question

我试图用一个例子来说明我的问题。

我的组合框有一个对象列表作为itemssource。在我的例子中，它是一个人员列表。在组合框中，我想显示该人的名字和姓氏。但我想在人物对象的“所有者”属性中保存此人的姓氏。

我的猜测是我将SelectedValue绑定到我的属性，将SelectedValuePath绑定到组合框架中属性的名称。

我已经使用Google搜索并尝试查看其他版本，但没有任何效果。

如果我使用SelectedItem而不是SelectedValue使用相同的绑定，至少在该属性中写入“tostring”函数的值。遗憾的是，该解决方案不适合我的其余程序，因为我不想覆盖“ToString”。

Xaml：

<Window x:Class="MultiColumnCombobox.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"
x:Name="window">

<Grid>
    <ComboBox Height="23"
              Margin="72,12,86,0"
              Name="ComboBox1"
              VerticalAlignment="Top"                  
              SelectedValue="{Binding CurrentHouse.Owner, ElementName=window, Mode=TwoWay}"
              SelectedValuePath="LastName"
              ItemsSource="{Binding PersonList, ElementName=window, Mode=Default}">
        <ComboBox.ItemTemplate>
            <DataTemplate>
                <WrapPanel Orientation="Horizontal">
                    <TextBlock Text="{Binding Path=FirstName}"
                               Padding="10,0,0,0" />
                    <TextBlock Text="{Binding Path=LastName}"
                               Padding="10,0,0,0" />
                </WrapPanel>
            </DataTemplate>
        </ComboBox.ItemTemplate>
    </ComboBox>
    <Button Height="23"
            Click="PrintButton_Click"
            HorizontalAlignment="Left"
            Margin="12,0,0,9"
            Name="PrintButton"
            VerticalAlignment="Bottom"
            Width="75">Print</Button>

</Grid>

C＃

using System.Collections.Generic;
using System.Windows;
using System;

namespace MultiColumnCombobox
{  
public partial class Window1 : Window
{
    private List<Person> _PersonList = new List<Person>();        
    public List<Person> PersonList
    {
        get { return _PersonList; }
        set { _PersonList = value; }
    }

    private House _CurrentHouse = new House { Owner = "Green", Number = "11" };
    public House CurrentHouse
    {
        get { return _CurrentHouse; }

    }

    public Window1()
    {                        
        InitializeComponent();
        PersonList.Add(new Person {FirstName = "Peter", LastName = "Smith"});
        PersonList.Add(new Person {FirstName = "John", LastName = "Meyer"});
        PersonList.Add(new Person {FirstName = "Fritz", LastName = "Green"});            
    }

    private void PrintButton_Click(object sender, RoutedEventArgs e)
    {            
        MessageBox.Show(CurrentHouse.Owner + ":" + CurrentHouse.Number);
    }       
}

public class House
{ 
    public string Owner  { get; set; }
    public string Number  { get; set; }
}

public class Person 
{ 
    public string FirstName  { get; set; }
    public string LastName  { get; set; }
}
}

也许有人有想法，

基督教

Answer 1

如果我理解你的问题，你想在ComboBox中取当前所选Person的姓氏，并将其值设置为CurrentHouse.Owner属性。如果是这样，请查看以下内容并查看是否有意义。具体来说，请查看ComboBox的SelectedValue和SelectedValuePath属性的设置。

代码背后

public partial class MultiColumnCombobox : Window
{
    public List<Person> PersonList { get; set; }

    public House CurrentHouse { get; set; }

    public MultiColumnCombobox()
    {
        InitializeComponent();

        PersonList = new List<Person>
                         {
                             new Person
                                 {
                                     FirstName = "Peter",
                                     LastName = "Smith"
                                 },
                             new Person
                                 {
                                     FirstName = "John",
                                     LastName = "Meyer"
                                 },
                             new Person
                                 {
                                     FirstName = "Fritz",
                                     LastName = "Green"
                                 }
                         };

        CurrentHouse = new House
                           {
                               Owner = "Green",
                               Number = "11"
                           };

        this.DataContext = this;

        ShowCurrentHouseInfo();
    }

    private void OnComboBoxChanged( object sender, SelectionChangedEventArgs e )
    {
        ShowCurrentHouseInfo();
    }

    private void ShowCurrentHouseInfo()
    {
        MyTextBlock.Text = string.Format(
            "CurrentHouse.Owner: {0} : CurrentHouse.Number: {1}",
            CurrentHouse.Owner, CurrentHouse.Number);
    }
}

public class House
{
    public string Owner { get; set; }
    public string Number { get; set; }
}

public class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

<强> XAML

<StackPanel>
    <ComboBox
        Margin="10"
        Name="ComboBox1"
        VerticalAlignment="Top"        
        SelectedValue="{Binding CurrentHouse.Owner}"
        SelectedValuePath="LastName"
        SelectionChanged="OnComboBoxChanged"
        ItemsSource="{Binding PersonList}">
        <ComboBox.ItemTemplate>
            <DataTemplate>
                <WrapPanel Orientation="Horizontal">
                    <TextBlock Text="{Binding Path=FirstName}"
                           Padding="10,0,0,0" />
                    <TextBlock Text="{Binding Path=LastName}"
                           Padding="10,0,0,0" />
                </WrapPanel>
            </DataTemplate>
        </ComboBox.ItemTemplate>
    </ComboBox>

    <TextBlock x:Name="MyTextBlock" Margin="10" />

</StackPanel>

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