C# Combobox和DisplayMemberBinding值

我已经在网上搜索过了，但我找不到一个可靠的答案来回答我的问题。这可能是因为我不是100%熟悉XAML，但

我希望能够通过代码设置一个组合框数据源。我已经做到了。但是，此comboboxs selected值会更新以匹配listview中选择的值，并且在编辑ComboxBox时，listview中的值也会更新。我以为这只能通过装订来完成。我不想硬编码一些“变通”。因为我已经找到了解决办法

XAML代码：

<ListView Name="ActionListView" ItemsSource="{Binding Actions, UpdateSourceTrigger=PropertyChanged}" SelectedItem="{Binding Path=FirstListViewSelectedItem, Mode=TwoWay}">
    <ListView.View>                
        <GridView>
            <GridViewColumn Header="Command" DisplayMemberBinding="{Binding Command}" />
        </GridView>
    </ListView.View>
</ListView>

<ComboBox IsEditable="True" Name="CommandCB" ItemsSource="{Binding Commands}" SelectedValue="{Binding Path=Command, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>

C代码：

public partial class DetailsView : UserControl, INotifyPropertyChanged {

public event PropertyChangedEventHandler PropertyChanged;

private ObservableCollection<ActionObject> myActions;
public ObservableCollection<ActionObject> Actions
{
    get { return myActions; }
    set
    {
        if (myActions != value)
        {
            myActions = value;
            OnPropertyChanged("Actions");
        }
    }
}

private List<string> myCommands;
public List<string> Commands
{
    get { return myCommands; }
    set
    {
        if (myCommands != value)
        {
            myCommands = value;
            OnPropertyChanged("Commands");
        }
    }
}

private string myCommand;
public string Command
{
    get { return myCommand; }
    set
    {
        if (value != myCommand)
        {
            myCommand = value;
            OnPropertyChanged("Command");
        }
    }
}

protected void OnPropertyChanged(string name)
{
    PropertyChangedEventHandler handler = PropertyChanged;
    if (handler != null)
    {
        handler(this, new PropertyChangedEventArgs(name));
    }
}

public DetailsView()
{
    myCommands = GetCommandObjects().Select(x => x.Name).ToList();
    myActions = new ObservableCollection<ActionObject>();

    InitializeComponent();
    DataContext = this;
}

private List<CommandObject> GetCommandObjects()
{
    using (StreamReader r = new StreamReader("commands.json"))
    {
        return JsonConvert.DeserializeObject<List<CommandObject>>(r.ReadToEnd());
    }
}

private void MenuItem_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    if (ActionListView.SelectedIndex != -1)
    {
        if (ActionListView.SelectedItem == null)
            return;

        ActionObject _action = myActions.ElementAt(ActionListView.SelectedIndex);
        Command = _action.Command;
    }
}
}


public class ActionObject
{
    public string Command   { get; set; }
    public string Target    { get; set; }
    public string Value     { get; set; }
    public string Comment   { get; set; }
}

将列表命令替换为ObservableCollection命令

此外，您不应该一次又一次地分配集合。从中删除和/或添加项目

所以你的代码变成了这样

private ObservableCollection<ActionObject> myActions;
public ObservableCollection<ActionObject> Actions
{
    get 
    {
         if (myActions == null) 
             myActions = new ObservableCollection<ActionObject>();
         return myActions; 
    }
}

private ObservableCollection<string> myCommands;
public ObservableCollection<string> Commands
{
    get 
    {
        if (myCommands == null) 
            myCommands = new ObservableCollection<string>();
        return myCommands; 
    }
}

将列表命令替换为ObservableCollection命令

此外，您不应该一次又一次地分配集合。从中删除和/或添加项目

所以你的代码变成了这样

private ObservableCollection<ActionObject> myActions;
public ObservableCollection<ActionObject> Actions
{
    get 
    {
         if (myActions == null) 
             myActions = new ObservableCollection<ActionObject>();
         return myActions; 
    }
}

private ObservableCollection<string> myCommands;
public ObservableCollection<string> Commands
{
    get 
    {
        if (myCommands == null) 
            myCommands = new ObservableCollection<string>();
        return myCommands; 
    }
}

找到了解决办法

以前的：

ItemsSource="{Binding Commands}" SelectedValue="{Binding Path=Command, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"

答复:

ItemsSource="{Binding Commands}" SelectedValue="{Binding ElementName=ActionListView, Path=SelectedItem.Command, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"

我必须设置元素名和路径以匹配Listview。

找到了解决方案

以前的：

ItemsSource="{Binding Commands}" SelectedValue="{Binding Path=Command, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"

答复:

ItemsSource="{Binding Commands}" SelectedValue="{Binding ElementName=ActionListView, Path=SelectedItem.Command, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"

---

我必须设置元素名和路径以匹配Listview。

据我所知，我需要它是一个列表。除非有办法改变。我有一个来自JSON脚本的对象列表。json无法将列表转换为ObservableCollection。myCommand=GetCommandObjects.Selectx=>x.Name.ToList；您始终可以在myList命令中执行foreachvar项。Additem，请尝试添加属性而不是其备份字段。我已将代码更改为：'MyCommand=new ObservableCollectionGetCommandObjects.Selectx=>x.Name.ToList；'但是我不明白这是如何回答我的问题的？如果我们直接命中属性，“备份字段”有什么意义？您的VS是否支持此公共ObservableCollection命令{get；}=new ObservableCollection；如果是，那么像这样更改集合属性。据我所知，我需要它是一个列表。除非有办法改变。我有一个来自JSON脚本的对象列表。json无法将列表转换为ObservableCollection。myCommand=GetCommandObjects.Selectx=>x.Name.ToList；您始终可以在myList命令中执行foreachvar项。Additem，请尝试添加属性而不是其备份字段。我已将代码更改为：'MyCommand=new ObservableCollectionGetCommandObjects.Selectx=>x.Name.ToList；'但是我不明白这是如何回答我的问题的？如果我们直接命中属性，“备份字段”有什么意义？您的VS是否支持此公共ObservableCollection命令{get；}=new ObservableCollection；如果是，则像这样更改集合属性。