在WPF的MVVM框架中获取下拉选择列表中的选中项

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本演示介绍如何在WPF的MVVM框架中，通过数据绑定的方式获取下拉列表中的选中项。程序运行后的效果如下图所示：

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XAML代码如下所示：

<Window x:Class="Demo02Ex01.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="262" Width="402">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition />
        </Grid.ColumnDefinitions>
        <ComboBox Grid.Row="0" Grid.Column="0" Width="300" Height="30"
                  ItemsSource="{Binding CompanyNames}" DisplayMemberPath="CompanyName"
                  SelectedItem="{Binding CurrentCompany}" />
        <Button Grid.Row="1" Width="100" Height="70" Content="获取选择项"
                Command="{Binding Path=ShowSelectedCompanyCommand}"/>
    </Grid>
</Window>

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        this.DataContext = new MainWindowModel();
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;

namespace Demo02Ex01.ViewModels
{
    public class MainWindowModel
    {
        public MainWindowModel()
        {
            this.CompanyNames = new List<Company>();
            this.CompanyNames.Add(new Company() { CompanyName = "中国核工业集团公司", Address = "" });
            this.CompanyNames.Add(new Company() { CompanyName = "中国航科技集团公司", Address = "" });
            this.CompanyNames.Add(new Company() { CompanyName = "中国电科技集团公司", Address = "" });
            this.CompanyNames.Add(new Company() { CompanyName = "中国长江三峡工程发总公司", Address = "" });
            this.CompanyNames.Add(new Company() { CompanyName = "中国移通信集团公司", Address = "" });
            this.CurrentCompany = this.CompanyNames[1];
            this.ShowSelectedCompanyCommand = new DelegateCommand(this.ShowSelectedCompanyHandler);
        }

        public List<Company> CompanyNames { get; set; }

        public Company CurrentCompany { get; set; }

        public DelegateCommand ShowSelectedCompanyCommand { get; set; }

        private void ShowSelectedCompanyHandler(object sender, DelegateCommandEventArgs e)
        {
            MessageBox.Show(this.CurrentCompany.CompanyName);
        }
    }
}

public class Company
{
    public string CompanyName { get; set; }
    public string Address { get; set; }
}

private void ShowSelectedCompanyHandler(object sender, DelegateCommandEventArgs e)
{
    MessageBox.Show(this.CurrentCompany.CompanyName);
}

在WPF的MVVM框架中获取下拉选择列表中的选中项

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原文地址：http://blog.csdn.net/gjysk/article/details/40407287