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试图理解WPF的绑定过程。WPF简单绑定问题
请参阅底部的代码。
在我的“viewmodel”中，查看底部的代码，我有一个可观察的集合，它是用项目填充listview的。那就是包含一个叫做symbol的路径来设置组合框中所选索引的路径。现在我的问题是，我需要从其他列表中填充组合框，然后再添加到列表视图（一些默认值）。 因为我刚刚开始使用WPF，我认为也许你可以在同一个类中使用2个不同的ObservableCollections来实现这一目标，但这并没有奏效。那么我怎么能填充数据模板的默认值之前，他们被绑定/添加到列表视图？
这是我用来填充列表视图，请参阅底部的viewmodelcontacts。
我也尝试添加另一个类，我可以在我的组合框中使用一个新的observablecollection，但我没有得到那个工作。 应该填充的数据来自位于我应用程序资源中的XML文件。
另一个问题，是否可以添加命令图像？或者命令只能从继承自button_base类的控件中获得？我想在元素旁边使用图片，当用户点击该图片时，他们会删除该元素。
- 从下面的答案，是有可能不添加按钮，因为我不想按钮感觉吗（比如悬停和点击时）*
Window.xaml：
<r:RibbonWindow x:Class="Onyxia_KD.Windows.ContactWorkspace"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:r="clr-namespace:Microsoft.Windows.Controls.Ribbon;assembly=RibbonControlsLibrary"
Title="Contact card" ResizeMode="NoResize" Height="600" Width="600"
Background="White">
<r:RibbonWindow.Resources>
<DataTemplate x:Key="cardDetailFieldTemplate">
<TextBox Text="{Binding Path=Field}" MinWidth="150"></TextBox>
</DataTemplate>
<DataTemplate x:Key="cardDetailValueTemplate">
<TextBox Text="{Binding Path=Value}" MinWidth="150"></TextBox>
</DataTemplate>
<DataTemplate x:Key="cardDetailSymbolTemplate">
<!-- Here is the problem. Populating this with some default values for each entry before the selectedIndex is bound from the datasource -->
<ComboBox SelectedIndex="{Binding Path=Symbol}" DataContext="_vmSettings" ItemsSource="{Binding Symbols}" Grid.Column="1" Margin="0,0,10,0" VerticalAlignment="Center" HorizontalAlignment="Center">
<ListViewItem Padding="0,3,0,3" Content="{Binding Path=Value}" />
</ComboBox>
</DataTemplate>
<DataTemplate x:Key="cardDetailCategoryTemplate">
<ComboBox SelectedIndex="{Binding Path=Category}" Grid.Column="1" Margin="0,0,10,0" VerticalAlignment="Center" HorizontalAlignment="Center">
<!--same as the combobox above but categories instead of symbols-->
</ComboBox>
</DataTemplate>
</r:RibbonWindow.Resources>
...
<ListView ItemsSource="{Binding ContactData}" Foreground="Black" SelectionMode="Single" x:Name="cardDetailList" KeyDown="cardDetailList_KeyDown">
<ListView.View>
<GridView>
<GridViewColumn Header="Category" Width="auto" CellTemplate="{StaticResource cardDetailCategoryTemplate}"></GridViewColumn>
<GridViewColumn Header="Field" Width="auto" CellTemplate="{StaticResource cardDetailFieldTemplate}"></GridViewColumn>
<GridViewColumn Header="Symbol" Width="70" CellTemplate="{StaticResource cardDetailSymbolTemplate}"></GridViewColumn>
<GridViewColumn Header="Value" Width="auto" CellTemplate="{StaticResource cardDetailValueTemplate}"></GridViewColumn>
</GridView>
</ListView.View>
</ListView>
后面的代码：
private ViewModelContacts _vm;
public ContactWorkspace()
{
InitializeComponent();
_vm = new ViewModelContacts();
this.DataContext = _vm;
}
private void Run_MouseUp(object sender, MouseButtonEventArgs e)
{
_vm.AddNewDetail();
}
private void Image_MouseUp(object sender, MouseButtonEventArgs e)
{
_vm.AddNewDetail();
}
private void cardDetailList_KeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Delete)
{
if (MessageBox.Show("Are you sure that you want to delete this?", "Warning!", MessageBoxButton.YesNo, MessageBoxImage.Warning) == MessageBoxResult.Yes)
{
_vm.RemoveDetail(cardDetailList.SelectedIndex);
}
}
}
ViewModelContacts：
public ObservableCollection<ContactCardData> ContactData { get; set; }
public ViewModelContacts()
{
ContactData = new ObservableCollection<ContactCardData>();
Populate();
}
private void Populate()
{
ContactData.Add(new ContactCardData("Test", 0, 0, "Value123"));
ContactData.Add(new ContactCardData("Test2", 1, 1, "Value1234"));
ContactData.Add(new ContactCardData("Test3", 2, 2, "Value1235"));
ContactData.Add(new ContactCardData("Test4", 3, 3, "Value12356"));
}
public void UpdateNode()
{
ContactData.ElementAt(0).Value = "Giraff";
}
public void AddNewDetail()
{
ContactData.Add(new ContactCardData());
}
public void RemoveDetail(int position)
{
ContactData.RemoveAt(position);
}
ViewModelContactData：
public class ContactCardData : DependencyObject
{
public int Category
{
get { return (int)GetValue(CategoryProperty); }
set { SetValue(CategoryProperty, value); }
}
// Using a DependencyProperty as the backing store for Category. This enables animation, styling, binding, etc...
public static readonly DependencyProperty CategoryProperty =
DependencyProperty.Register("Category", typeof(int), typeof(ContactCardData), new UIPropertyMetadata(0));
public string Field
{
get { return (string)GetValue(FieldProperty); }
set { SetValue(FieldProperty, value); }
}
// Using a DependencyProperty as the backing store for Field. This enables animation, styling, binding, etc...
public static readonly DependencyProperty FieldProperty =
DependencyProperty.Register("Field", typeof(string), typeof(ContactCardData), new UIPropertyMetadata(""));
public string Value
{
get { return (string)GetValue(ValueProperty); }
set { SetValue(ValueProperty, value); }
}
// Using a DependencyProperty as the backing store for Value. This enables animation, styling, binding, etc...
public static readonly DependencyProperty ValueProperty =
DependencyProperty.Register("Value", typeof(string), typeof(ContactCardData), new UIPropertyMetadata(""));
public int Symbol
{
get { return (int)GetValue(SymbolProperty); }
set { SetValue(SymbolProperty, value); }
}
// Using a DependencyProperty as the backing store for Symbol. This enables animation, styling, binding, etc...
public static readonly DependencyProperty SymbolProperty =
DependencyProperty.Register("Symbol", typeof(int), typeof(ContactCardData), new UIPropertyMetadata(0));
public ContactCardData()
{
}
public ContactCardData(string field, int category, int symbol, string value)
{
this.Symbol = symbol;
this.Category = category;
this.Field = field;
this.Value = value;
}
}
嗨，谢谢你的回应。我似乎没有100％地解释我自己。 我添加了我的XAML的listview和我的代码，我没有设法工作的是符号。我不知道该绑定什么。我想将所有预定义的xml内容添加到外部类，并将其用于所有预定义的数据绑定。但我怎样才能将一个组合框绑定到2个datacontexts在同一时间？一个用于应用当前选定的索引，另一个用于在用默认值显示组合框之前填充组合框。 – Patrick 2010-07-24 08:25:16