Question

在GridView中可以手动将列ItemsSource绑定到Enum，并将selectedItemBinding路径设置为DataGrid.ItemsSource的属性，如下所示：

send()

...

<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,
}

我想要做的是类似地将列绑定到ObservableCollection，但它并不是很有用。我尝试使用column1中的staticResource执行此操作，该工作正常但不显示初始设置的值，以及第2列中的本地observableCollection，其显示初始值，但绑定的属性的值不会随着在组合框中选择新项目而改变。 Column3用于显示绑定属性是否更改。

public MainWindow()
    {

        InitializeComponent();
        _orders = new ObservableCollection<ZlecNag>()
        {
            new ZlecNag() {
                Id = 1,
                Direction = Direction.Imp
                }
        }
    DgvZlecNag.ItemsSource = zlecenia;
    }

背后的代码：

<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>

...

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));
    }
}

...

包含column2的objectDataProvider数据的类：

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));
    }
}

请帮忙，我没有想法如何解决这个问题。

Answer 1

您没有在column2中使用Binding，而是编写了SelectedItem="Client"，请考虑在SelectedItem中绑定。

Answer 2

显然，如果没有包含组合框的模板列，也可以完成。它看起来更好，因为单元看起来不像一个组合框，直到它被点击，所以它不会从其他DataGrid单元中脱颖而出。

根据答案https://stackoverflow.com/a/5409984/2458980

<DataGridComboBoxColumn SelectedValueBinding="{Binding Contractor, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" 
                        DisplayMemberPath="Acronym">     
    <DataGridComboBoxColumn.ElementStyle>
         <Style TargetType="{x:Type ComboBox}">
             <Setter Property="ItemsSource" Value="{Binding Path=Contractors, RelativeSource={RelativeSource AncestorType={x:Type Window}}}" />
         </Style>
     </DataGridComboBoxColumn.ElementStyle>
     <DataGridComboBoxColumn.EditingElementStyle>
         <Style TargetType="{x:Type ComboBox}">
             <Setter Property="ItemsSource" Value="{Binding Path=Contractors, RelativeSource={RelativeSource AncestorType={x:Type Window}}}" />
         </Style>
     </DataGridComboBoxColumn.EditingElementStyle>
</DataGridComboBoxColumn>

将DatagridColumn绑定到指向WPF中的ObservableCollection的StaticResource

2 个答案: