WPF列表框绑定问题 [英] WPF List Box Binding Issue

问题描述

大家好，

我正在尝试为WPF MVVM开发示例应用程序。 我无法绑定列表框中的数据。 请按以下方式找到代码段

I am trying to develop sample application for WPF MVVM.  I am unable to bind the data in list box.  Please find the code snippet as follows

XAML

<Window x:Class="Employee.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:Employee"
        xmlns:ViewModel="clr-namespace:Employee.ViewModel;assembly=Employee.ViewModel"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <ListBox x:Name="listBox" 
                 HorizontalAlignment="Left" Height="152" Margin="149,34,0,0" VerticalAlignment="Top" Width="281"
                 ItemsSource="{Binding Employees}">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal">
                        <!--<TextBlock Padding="5,0,5,0" Text="{Binding Id}" />-->
                        <TextBlock Text="{Binding Name}" />
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </Grid>
</Window>

XAML.cs

namespace Employee
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            dynamic viewModel = new EmployeeViewModel();
            DataContext = viewModel;
        }
    }
}

View-Model

View-Model

namespace Employee.ViewModel
{
    public class EmployeeViewModel //: INotifyPropertyChanged
    {
        private EmployeeRepository _Repository;

        public IEnumerable<EmployeeModel> Employees; *** TRYING TO BIND EMPLOYEE INFORMATION IN LIST BUT NOT WORKING :( ***

        //public event PropertyChangedEventHandler PropertyChanged;

        public EmployeeViewModel()
        {
            _Repository = new EmployeeRepository();
            GetEmployees();
        }

        public void GetEmployees()
        {
            Employees = _Repository.GetEmployees();
        }

    }
}

模型

EmployeeModel contains Id and Name property and trying to bind Name property in List Box.

请帮我修复此问题;为什么它没有在列表框中显示数据。

Please help me to fix this issue; why it is not displaying the data in List Box.

谢谢

Selvakumar R

Selvakumar R

推荐答案

我看到的第一件事是 员工是一个字段而不是一个属性。

The first thing I see is that Employees is a field not a property.

最好将Employees作为ObservableCollection以便更改到了山坳在UI中可以看到。

It is also better to have Employees as an ObservableCollection so that changes to the collection would be seen in the UI.

这篇关于WPF列表框绑定问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！