[英]C# WPF Make DataGrid TemplateColumn ComboBox editable based on it's ItemsSource
如何根据列中的项目是否具有在生成列时将ItemsSource
属性设置为null
方式来使ComboBox 可编辑 ?
只需在选定的索引更改事件或主窗口加载时选中组合框itemsource,然后为该选定的项目设置组合框IsEditable="true"
。
You can add style to ComboBox
with DataTrigger
where you will check if ItemsSource
is null. 您可以使用
DataTrigger
将样式添加到ComboBox
,在其中检查ItemsSource
是否为null。
Here is very simple example: 这是一个非常简单的示例:
<Window x:Class="Q52063400.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"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid>
<DataGrid ItemsSource="{Binding}" AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTextColumn Header="Name" Binding="{Binding Name}" />
<DataGridTextColumn Header="Surname" Binding="{Binding Surname}" />
<DataGridTemplateColumn Header="City">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox ItemsSource="{Binding Cities}"
SelectedItem="{Binding SelectedCity, Mode=TwoWay}">
<ComboBox.Style>
<Style TargetType="ComboBox">
<Setter Property="IsEditable" Value="False"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Cities}" Value="{x:Null}">
<Setter Property="IsEditable" Value="True"/>
</DataTrigger>
</Style.Triggers>
</Style>
</ComboBox.Style>
</ComboBox>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
</Grid>
</Window>
Code-behind: 后台代码:
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DataContext = GetItems();
}
public List<Person> GetItems ()
{
return new List<Person>()
{
new Person {Name = "John", Surname = "Rocky", Cities = new List<string> { "New York City", "Washington D.C.", "Chicago" } },
new Person {Name = "John", Surname = "Rocky"},
new Person {Name = "John", Surname = "Rocky", Cities = new List<string> { "Baltimore", "San Francisco", "Boston" } }
};
}
}
public class Person
{
public string Name { get; set; }
public string Surname { get; set; }
public IEnumerable<string> Cities { get; set; }
public string SelectedCity { get; set; }
}
Example with different editor based on ItemsSource: 基于ItemsSource使用不同编辑器的示例:
...
<DataGridTemplateColumn Header="City">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Grid>
<TextBox Text="{Binding SelectedCity, Mode=TwoWay}">
<TextBox.Style>
<Style TargetType="TextBox">
<Setter Property="Visibility" Value="Collapsed"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Cities}" Value="{x:Null}">
<Setter Property="Visibility" Value="Visible"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBox.Style>
</TextBox>
<ComboBox ItemsSource="{Binding Cities}"
SelectedItem="{Binding SelectedCity, Mode=TwoWay}">
<ComboBox.Style>
<Style TargetType="ComboBox">
<Setter Property="Visibility" Value="Visible"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Cities}" Value="{x:Null}">
<Setter Property="Visibility" Value="Collapsed"/>
</DataTrigger>
</Style.Triggers>
</Style>
</ComboBox.Style>
</ComboBox>
</Grid>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
...
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