c# - 无法将 ObservableCollection 绑定(bind)到 DataGrid

Question

如果我用 C# 编码编写就可以了比如

DataGrid dg = new DataGrid();
dg.AutoGenerateColumns = true;
dg.ItemsSource = db;

数据库在哪里

public ObservableCollection<Data> db = new ObservableCollection<Data>();

db.Add(new Data { Name = "person1", Description = "sssssss", Price = 15 });
db.Add(new Data { Name = "person2", Description = "okokok", Price = 12 });

它将很好地生成列和数据..但是如果我用 XAML 编写它就不能显示任何东西

<DataGrid ItemsSource="{Binding db}" AutoGenerateColumns="True"/>

我找不到将此集合绑定(bind)到 DataGrid 的方法。请告诉我为什么

这是我所有的xaml

<Window x:Class="testt.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">
<Grid>
    <StackPanel Orientation="Vertical" Name="Panel">
        <TextBlock Name="count"/>
        <DataGrid ItemsSource="{Binding db}" AutoGenerateColumns="True"/>       
    </StackPanel>
</Grid>
</Window>

谢谢

Answer 1

如果您不使用 MVVM，请在您的代码中尝试此操作，

DataGrid dg = new DataGrid();
dg.AutoGenerateColumns = true;
dg.ItemsSource = db;
this.DataContext = this; //or put this line in constructor.

数据库在哪里

public ObservableCollection<Data> db = new ObservableCollection<Data>();

db.Add(new Data { Name = "person1", Description = "sssssss", Price = 15 });
db.Add(new Data { Name = "person2", Description = "okokok", Price = 12 });

在 Xaml 中，

<Window x:Class="testt.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">
<Grid>
    <StackPanel Orientation="Vertical" Name="Panel">
        <TextBlock Name="count"/>
        <DataGrid ItemsSource="{Binding db}" AutoGenerateColumns="True"/>       
    </StackPanel>
</Grid>
</Window>