【发布时间】：2015-12-10 21:07:55
【问题描述】：
可以在 GridView 中手动将列 ItemsSource 绑定到 Enum，并将 selectedItemBinding 路径设置为 DataGrid.ItemsSource 的属性，如下所示：
<Window.Resources>
<ObjectDataProvider x:Key="DirectionEnum"
MethodName="GetValues"
ObjectType="{x:Type core:Enum}">
<ObjectDataProvider.MethodParameters>
<x:Type Type="local:Direction"/>
</ObjectDataProvider.MethodParameters>
</ObjectDataProvider>
</Window.Resources>
...
<DataGrid x:Name="DgvZlecNag"
AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridComboBoxColumn Header="Column0"
SelectedItemBinding="{Binding Direction}"
ItemsSource="{Binding Source={StaticResource DirectionEnum}}"/>
...
public enum Direction
{
Def = 0,
Imp = 1,
Exp = 2,
}
...
public MainWindow()
{
InitializeComponent();
_orders = new ObservableCollection<ZlecNag>()
{
new ZlecNag() {
Id = 1,
Direction = Direction.Imp
}
}
DgvZlecNag.ItemsSource = zlecenia;
}
我想要做的是将列类似地绑定到 ObservableCollection，但它并不完全有效。 我尝试使用 column1 中的 staticResource 来执行此操作，它有效但不显示初始设置的值， 和column2中的本地observableCollection，它显示了初始值，但绑定属性的值不会随着在组合框中选择新项目而改变。 Column3 只是显示绑定的属性是否发生变化。
<Window x:Class="ZleceniaTransportowe2.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:ZleceniaTransportowe2"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
xmlns:core="clr-namespace:System;assembly=mscorlib"
mc:Ignorable="d"
Title="MainWindow" Height="500" Width="1200"
>
<Window.Resources>
<ObjectDataProvider x:Key="Clients"
MethodName="GetData"
ObjectType="{x:Type local:CollectionData}"
>
<ObjectDataProvider.MethodParameters>
<x:Type Type="local:CollectionData"/>
</ObjectDataProvider.MethodParameters>
</ObjectDataProvider>
<local:IfNullConverter x:Key="IfNullConverter"/>
</Window.Resources>
<DataGrid x:Name="DgvZlecNag"
AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTextColumn Header="Id"
Binding="{Binding Id, Mode=OneWay}"/>
<DataGridComboBoxColumn Header="Column1"
SelectedItemBinding="{Binding Path=Client, Mode=TwoWay}"
ItemsSource="{Binding Source={StaticResource Clients}}"
SelectedValuePath="Akronim" DisplayMemberPath="Akronim"/>
<DataGridTemplateColumn Header="Column2">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox SelectedValue="{Binding Client.Akronim, Mode=TwoWay}"
DisplayMemberPath="Akronim" SelectedValuePath="Akronim" SelectedItem="Client"
ItemsSource= "{Binding Clients, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window }}}"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTextColumn Header="column3"
Binding="{Binding Client.Akronim, Mode=OneWay}"/>
</DataGrid.Columns>
</DataGrid>
</Window>
后面的代码：
namespace ZleceniaTransportowe2
{
public partial class MainWindow: Window
private ObservableCollection<ZlecNag> _orders;
public ObservableCollection<Client> Clients {get;} = new ObservableCollection<Client>()
{
new Client()
{
Akronim = "Seifert",
},
new Client()
{
Akronim = "Cenergo",
}
};
public MainWindow()
{
InitializeComponent();
_orders = new ObservableCollection<ZlecNag>()
{
new ZlecNag() {
Id = 1,
Client = Clients.First(),
},
new ZlecNag() {
Id = 1,
Client = Clients[1],
}
};
DgvZlecNag.ItemsSource = _orders;
}
}
}
...
public class ZlecNag : INotifyPropertyChanged
{
private Direction _direction;
private Client _client;
public Direction Direction
{
get { return _client; }
set
{
_direction= value;
OnPropertyChanged();
}
}
public Client Client
{
get { return _client; }
set
{
_client = value;
OnPropertyChanged();
}
}
public event PropertyChangedEventHandler PropertyChanged;
[NotifyPropertyChangedInvocator]
void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
...
public class Client : INotifyPropertyChanged
{
private int _gidNumer;
private string _akronim;
public int GidNumer
{
get { return _gidNumer; }
set
{
_gidNumer = value;
OnPropertyChanged();
}
}
public string Akronim
{
get { return _akronim; }
set
{
_akronim = value;
OnPropertyChanged();
}
}
public event PropertyChangedEventHandler PropertyChanged;
[NotifyPropertyChangedInvocator]
void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
...
column2 的 objectDataProvider 的数据类：
public class CollectionData
{
public static ObservableCollection<Client> GetData(Type type = null)
{
var clients = new ObservableCollection<Client>()
{
new Client()
{
Akronim = "Seifert",
GidNumer = 4654
},
new Kontrahent()
{
Akronim = "Cenergo",
GidNumer = 4656
}
};
return clients;
}
}
请帮忙，我不知道如何解决这个问题。
【问题讨论】：
-
请制作一个小型可行的应用程序，可以在概念上进行测试，类似于大型应用程序的小模型。
-
好主意@AnjumSKhan，我已经在我的项目中添加了指向 zip 文件的链接。
-
请将该链接作为评论发布。从问题中删除 Dropbox 链接，因为它不遵循 SO 准则。
-
解决方案链接：dropbox.com/s/t1sepx7eofx6hyg/solution.zip?dl=0>
标签： c# wpf xaml data-binding