wpf 组合框未正确显示“显示成员”？
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Combobox not displaying 'Display Member' properly?
提问by djangojazz
Okay I am not understanding why WPF cannot display the 'Display Member' of a combobox item yet can do the 'selected value'. What is weird is I can explicitly create the display member but not get it back. In my example below I simplified the real world example that would be using ADO.NET to populate the itemsource but the concept is the same. I am generating a combobox that generates at runtime from a sql statement. I want to get the value for one thing but the display for something else. Is there some extra binding or customization I am missing or just the wrong member of .NET? I merely want to get 'Display of ...' to get selected back. If it is not possible that seems kind of weird. All I get back when I select is 'Value' so I know something is being lost in the transfer.
好吧，我不明白为什么 WPF 无法显示组合框项目的“显示成员”但可以执行“选定值”。奇怪的是我可以显式创建显示成员但不能取回它。在下面的示例中，我简化了使用 ADO.NET 填充 itemsource 的真实示例，但概念是相同的。我正在生成一个在运行时从 sql 语句生成的组合框。我想获得一件事的价值，但另一件事的显示。是否有一些额外的绑定或自定义我遗漏或只是 .NET 的错误成员？我只想让“...的显示”被选中。如果不可能，那看起来有点奇怪。当我选择“价值”时，我得到的只是“价值”，所以我知道在转移中丢失了一些东西。
Any ideas?
有任何想法吗？
XAML:
XAML：
<Window x:Class="WPFComboBoxTest.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">
<StackPanel>
<ComboBox x:Name="cmb" Width="100" Height="50"/>
<TextBlock Height="100"/>
<Button x:Name="btn" Content="Click" Click="btn_Click" Width="50"/>
</StackPanel>
C# Code Behind:
背后的 C# 代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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;
using System.Data;
namespace WPFComboBoxTest
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
BindComboBox(cmb);
}
public void BindComboBox(ComboBox cbx)
{
DataTable dt = new DataTable();
dt.Columns.Add("Value", typeof(string));
dt.Columns.Add("Id", typeof(int));
dt.Rows.Add("Display of One", 1);
dt.Rows.Add("Display of Two", 2);
dt.Rows.Add("Display of Three", 3);
dt.Rows.Add("Display of Four", 4);
cbx.ItemsSource = dt.DefaultView;
cbx.DisplayMemberPath = dt.Columns["Value"].ToString();
cbx.SelectedValuePath = dt.Columns["Id"].ToString();
}
private void btn_Click(object sender, RoutedEventArgs e)
{
MessageBox.Show("Selected Value works: " + cmb.SelectedValue
+ "\n\nSelect Display does not though?: " + cmb.DisplayMemberPath
);
}
}
}
回答by H.B.
Calling ToStringon a column does not sound like a good idea to begin with, not sure how DataTablesare mapped but i would try
开始时调用ToString列听起来不是一个好主意，不确定如何DataTables映射，但我会尝试
cbx.DisplayMemberPath = "Value";
cbx.SelectedValuePath = "Id";
回答by djangojazz
(facepalm) it was pretty simple. cmb.DisplayMemberPath needs to be cmb.Text. The 'Text' was the property I needed to display the display member shown to the user.
（脸掌）这很简单。cmb.DisplayMemberPath 需要是 cmb.Text。'Text' 是我需要向用户显示显示成员的属性。
回答by Mubarak Shaikh
Change Your btn_Clickevent Data as Following:
更改您的btn_Click事件数据如下：
private void btn_Click(object sender, RoutedEventArgs e)
{
MessageBox.Show("Selected Value works: " + cmb.SelectedValue
+ "\n\nSelect Display does not though?: " + cmb.Text
);
}
I think working fine
我认为工作正常
回答by José Roberto Cuello Alcaraz
Try using:
尝试使用：
cbx.DisplayMemberPath = "[Value]";
cbx.SelectedValuePath = "[Id]";
It works for me!
这个对我有用！
