WPF中XAML ListView绑定ObservableCollection报错：DataContext找不到成员

核心问题 #

你在XAML里直接给ListView添加了<ListViewItem>，这会导致两个关键问题：

1. 手动添加的ListViewItem会覆盖ItemsSource自动生成的项，集合里的User对象无法被正常渲染
2. 该ListViewItem的DataContext继承自ListView的上下文（即MainWindow），所以{Binding EntireName}会去MainWindow中查找该属性，自然找不到，触发报错

修复步骤 #

1. 修正XAML的ListView结构 #

移除手动添加的<ListViewItem>，改用ItemTemplate定义每个捐赠者项的布局，确保每个项的DataContext对应集合中的User对象：

<Window x:Class="DonorWallFrontend.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:DonorWallFrontend"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"
        DataContext="{Binding RelativeSource={RelativeSource Self}}">

    <ListView HorizontalContentAlignment="Stretch" x:Name="donorList" ItemsSource="{Binding Donors}">
        <!-- 定义每个项的模板 -->
        <ListView.ItemTemplate>
            <DataTemplate>
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="105" />
                        <RowDefinition Height="80" />
                        <RowDefinition Height="80" />
                        <RowDefinition Height="80" />
                        <RowDefinition Height="80" />
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="1*"/>
                        <ColumnDefinition Width="1*"/>
                        <ColumnDefinition Width="1*"/>
                        <ColumnDefinition Width="1*"/>
                    </Grid.ColumnDefinitions>
                    
                    <Rectangle Grid.Row="1" Grid.Column="0" Fill="Purple" />
                    <Image Grid.Row="1" Grid.Column="0" VerticalAlignment="Center" HorizontalAlignment="Center" 
                           Source="C:\Workspace\silver_nameplate.png" Width="180" Height="65" />
                    <!-- 此时DataContext为User对象，绑定EntireName正常 -->
                    <TextBlock x:Name="NameBlock" Text="{Binding EntireName}" Grid.Row="1" Grid.Column="0" 
                               HorizontalAlignment="Center" VerticalAlignment="Top" FontSize="15" Margin="0,21,0,0"/>
                    <!-- 如需显示捐赠等级，添加以下TextBlock -->
                    <TextBlock Text="{Binding DonorLevel}" Grid.Row="1" Grid.Column="1" 
                               HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="15"/>
                </Grid>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>
    
</Window>

2. 简化代码后置的DataContext设置 #

删除代码中的donorList.DataContext = Donors;行，因为Window已将自身设为DataContext，ListView的ItemsSource="{Binding Donors}"会自动绑定到MainWindow的Donors属性。

3. 可选：给User类添加属性变更通知（推荐） #

如果后续需要修改User对象的属性并同步更新UI，User类需实现INotifyPropertyChanged接口：

using System.ComponentModel;

namespace DonorWallFrontend
{   
    public class User : INotifyPropertyChanged
    {
        private string _entireName;
        public string EntireName 
        { 
            get => _entireName; 
            set 
            {
                _entireName = value;
                OnPropertyChanged(nameof(EntireName));
            }
        }

        private string _donorLevel;
        public string DonorLevel 
        { 
            get => _donorLevel; 
            set 
            {
                _donorLevel = value;
                OnPropertyChanged(nameof(DonorLevel));
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
        protected virtual void OnPropertyChanged(string propertyName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    // MainWindow类保持不变（移除donorList.DataContext那行即可）
}

验证逻辑 #

修改后，ListView会自动遍历Donors集合中的每个User对象，每个DataTemplate的DataContext对应单个User实例，此时{Binding EntireName}能正确找到User类的属性，报错将被解决。

内容的提问来源于stack exchange，提问作者progroque