Question

我需要一些WPF绑定语法方面的帮助：

public class ApplicationPresenter
{
    public ObservableCollection<Quotes> PriceList {get;}
}


public class WebSitePricesView
{
    private IApplicationPresenter presenter
    {
        get { return (ApplicationPresenter)DataContext; }
    }   

//  public ObservableCollection<Quotes> PriceList
//  {
//      get {return presenter.PriceList; }
    }
}

这个XAML工作正常：

<UserControl.Resources>       
    <ObjectDataProvider x:Key="ApplicationPresenterDS" ObjectType="{x:Type local:ApplicationPresenter}" />
    <xcdg:DataGridCollectionViewSource x:Key="price_list" Source="{Binding Path=PriceList} />
</UserControl.Resources>                   
<xcdg:DataGridControl ItemsSource="{Binding Source={StaticResource price_list}} />

但是我不希望WebSitePricesView公开PriceList，我想将DataGridCollectionViewSource直接绑定到ApplicationPresenter.PriceList。

此XAML不会将任何值绑定到网格。显然我在为price_list .....定义绑定源时做错了。

<UserControl.Resources>       
    <ObjectDataProvider x:Key="ApplicationPresenterDS" ObjectType="{x:Type local:ApplicationPresenter}" />
        <xcdg:DataGridCollectionViewSource x:Key="price_list" Source="{Binding Source={StaticResource ApplicationPresenterDS}, Path=PriceList />            
</UserControl.Resources>  
<xcdg:DataGridControl ItemsSource="{Binding Source={StaticResource price_list}} />

第一次成功绑定的调试输出是：

Step into: Stepping over method without symbols 'Fenix.App.App'
System.Windows.Data Warning: 52 : Created BindingExpression (hash=35059110) for Binding (hash=15586314)
System.Windows.Data Warning: 54 :   Path: 'PriceList'
System.Windows.Data Warning: 56 : BindingExpression (hash=35059110): Default mode resolved to OneWay
System.Windows.Data Warning: 57 : BindingExpression (hash=35059110): Default update trigger resolved to PropertyChanged
System.Windows.Data Warning: 58 : BindingExpression (hash=35059110): Attach to Xceed.Wpf.DataGrid.DataGridCollectionViewSource.Source (hash=28137373)
System.Windows.Data Warning: 60 : BindingExpression (hash=35059110): Use Framework mentor <null>
System.Windows.Data Warning: 63 : BindingExpression (hash=35059110): Resolving source 
System.Windows.Data Warning: 65 : BindingExpression (hash=35059110): Framework mentor not found
System.Windows.Data Warning: 61 : BindingExpression (hash=35059110): Resolve source deferred
System.Windows.Data Warning: 91 : BindingExpression (hash=35059110): Got InheritanceContextChanged event from DataGridCollectionViewSource (hash=28137373)
System.Windows.Data Warning: 63 : BindingExpression (hash=35059110): Resolving source 
System.Windows.Data Warning: 66 : BindingExpression (hash=35059110): Found data context element: WebSitePricesXc (hash=11090012) (OK)
System.Windows.Data Warning: 67 : BindingExpression (hash=35059110): DataContext is null
System.Windows.Data Warning: 52 : Created BindingExpression (hash=53154844) for Binding (hash=52037308)
System.Windows.Data Warning: 54 :   Path: ''
System.Windows.Data Warning: 56 : BindingExpression (hash=53154844): Default mode resolved to OneWay
System.Windows.Data Warning: 57 : BindingExpression (hash=53154844): Default update trigger resolved to PropertyChanged
System.Windows.Data Warning: 58 : BindingExpression (hash=53154844): Attach to Xceed.Wpf.DataGrid.DataGridControl.ItemsSource (hash=16991442)
System.Windows.Data Warning: 63 : BindingExpression (hash=53154844): Resolving source 
System.Windows.Data Warning: 66 : BindingExpression (hash=53154844): Found data context element: <null> (OK)
System.Windows.Data Warning: 72 : BindingExpression (hash=53154844): Use View from DataGridCollectionViewSource (hash=28137373)
System.Windows.Data Warning: 74 : BindingExpression (hash=53154844): Activate with root item <null>
System.Windows.Data Warning: 100 : BindingExpression (hash=53154844): Replace item at level 0 with <null>, using accessor {DependencyProperty.UnsetValue}
System.Windows.Data Warning: 97 : BindingExpression (hash=53154844): GetValue at level 0 from <null> using <null>: <null>
System.Windows.Data Warning: 76 : BindingExpression (hash=53154844): TransferValue - got raw value <null>
System.Windows.Data Warning: 85 : BindingExpression (hash=53154844): TransferValue - using final value <null>
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
System.Windows.Data Warning: 63 : BindingExpression (hash=35059110): Resolving source 
System.Windows.Data Warning: 66 : BindingExpression (hash=35059110): Found data context element: WebSitePricesXc (hash=11090012) (OK)
System.Windows.Data Warning: 74 : BindingExpression (hash=35059110): Activate with root item ApplicationPresenter (hash=22260412)
System.Windows.Data Warning: 104 : BindingExpression (hash=35059110):   At level 0 - for ApplicationPresenter.PriceList found accessor RuntimePropertyInfo(PriceList)
System.Windows.Data Warning: 100 : BindingExpression (hash=35059110): Replace item at level 0 with ApplicationPresenter (hash=22260412), using accessor RuntimePropertyInfo(PriceList)
System.Windows.Data Warning: 97 : BindingExpression (hash=35059110): GetValue at level 0 from ApplicationPresenter (hash=22260412) using RuntimePropertyInfo(PriceList): ObservableCollection`1 (hash=40261689 Count=0)
System.Windows.Data Warning: 76 : BindingExpression (hash=35059110): TransferValue - got raw value ObservableCollection`1 (hash=40261689 Count=0)
System.Windows.Data Warning: 85 : BindingExpression (hash=35059110): TransferValue - using final value ObservableCollection`1 (hash=40261689 Count=0)
System.Windows.Data Warning: 92 : BindingExpression (hash=53154844): Got PropertyChanged event from DataGridCollectionViewSource (hash=28137373) for View
System.Windows.Data Warning: 75 : BindingExpression (hash=53154844): Deactivate
System.Windows.Data Warning: 99 : BindingExpression (hash=53154844): Replace item at level 0 with {NullDataItem}
System.Windows.Data Warning: 72 : BindingExpression (hash=53154844): Use View from DataGridCollectionViewSource (hash=28137373)
System.Windows.Data Warning: 74 : BindingExpression (hash=53154844): Activate with root item DataGridCollectionView (hash=22444475 Count=0)
System.Windows.Data Warning: 100 : BindingExpression (hash=53154844): Replace item at level 0 with DataGridCollectionView (hash=22444475 Count=0), using accessor {DependencyProperty.UnsetValue}
System.Windows.Data Warning: 97 : BindingExpression (hash=53154844): GetValue at level 0 from DataGridCollectionView (hash=22444475 Count=0) using <null>: DataGridCollectionView (hash=22444475 Count=0)
System.Windows.Data Warning: 76 : BindingExpression (hash=53154844): TransferValue - got raw value DataGridCollectionView (hash=22444475 Count=0)
System.Windows.Data Warning: 85 : BindingExpression (hash=53154844): TransferValue - using final value DataGridCollectionView (hash=22444475 Count=0)
System.Windows.Data Warning: 91 : BindingExpression (hash=35059110): Got PropertyChanged event from ApplicationPresenter (hash=22260412)
System.Windows.Data Warning: 97 : BindingExpression (hash=35059110): GetValue at level 0 from ApplicationPresenter (hash=22260412) using RuntimePropertyInfo(PriceList): ObservableCollection`1 (hash=6408547 Count=27)
System.Windows.Data Warning: 76 : BindingExpression (hash=35059110): TransferValue - got raw value ObservableCollection`1 (hash=6408547 Count=27)
System.Windows.Data Warning: 85 : BindingExpression (hash=35059110): TransferValue - using final value ObservableCollection`1 (hash=6408547 Count=27)
System.Windows.Data Warning: 92 : BindingExpression (hash=53154844): Got PropertyChanged event from DataGridCollectionViewSource (hash=28137373) for View
System.Windows.Data Warning: 75 : BindingExpression (hash=53154844): Deactivate
System.Windows.Data Warning: 99 : BindingExpression (hash=53154844): Replace item at level 0 with {NullDataItem}
System.Windows.Data Warning: 72 : BindingExpression (hash=53154844): Use View from DataGridCollectionViewSource (hash=28137373)
System.Windows.Data Warning: 74 : BindingExpression (hash=53154844): Activate with root item DataGridCollectionView (hash=61423861 Count=27)
System.Windows.Data Warning: 100 : BindingExpression (hash=53154844): Replace item at level 0 with DataGridCollectionView (hash=61423861 Count=27), using accessor {DependencyProperty.UnsetValue}
System.Windows.Data Warning: 97 : BindingExpression (hash=53154844): GetValue at level 0 from DataGridCollectionView (hash=61423861 Count=27) using <null>: DataGridCollectionView (hash=61423861 Count=27)
System.Windows.Data Warning: 76 : BindingExpression (hash=53154844): TransferValue - got raw value DataGridCollectionView (hash=61423861 Count=27)
System.Windows.Data Warning: 85 : BindingExpression (hash=53154844): TransferValue - using final value DataGridCollectionView (hash=61423861 Count=27)

第二个绑定的调试输出是：

Step into: Stepping over method without symbols 'Fenix.App.App'
System.Windows.Data Warning: 52 : Created BindingExpression (hash=35059110) for Binding (hash=15586314)
System.Windows.Data Warning: 54 :   Path: 'PriceList'
System.Windows.Data Warning: 56 : BindingExpression (hash=35059110): Default mode resolved to OneWay
System.Windows.Data Warning: 57 : BindingExpression (hash=35059110): Default update trigger resolved to PropertyChanged
System.Windows.Data Warning: 58 : BindingExpression (hash=35059110): Attach to Xceed.Wpf.DataGrid.DataGridCollectionViewSource.Source (hash=28137373)
System.Windows.Data Warning: 63 : BindingExpression (hash=35059110): Resolving source 
System.Windows.Data Warning: 66 : BindingExpression (hash=35059110): Found data context element: <null> (OK)
System.Windows.Data Warning: 73 : BindingExpression (hash=35059110): Use Data from ObjectDataProvider (hash=61302538)
System.Windows.Data Warning: 74 : BindingExpression (hash=35059110): Activate with root item ApplicationPresenter (hash=20390146)
System.Windows.Data Warning: 104 : BindingExpression (hash=35059110):   At level 0 - for ApplicationPresenter.PriceList found accessor RuntimePropertyInfo(PriceList)
System.Windows.Data Warning: 100 : BindingExpression (hash=35059110): Replace item at level 0 with ApplicationPresenter (hash=20390146), using accessor RuntimePropertyInfo(PriceList)
System.Windows.Data Warning: 97 : BindingExpression (hash=35059110): GetValue at level 0 from ApplicationPresenter (hash=20390146) using RuntimePropertyInfo(PriceList): ObservableCollection`1 (hash=12781633 Count=0)
System.Windows.Data Warning: 76 : BindingExpression (hash=35059110): TransferValue - got raw value ObservableCollection`1 (hash=12781633 Count=0)
System.Windows.Data Warning: 85 : BindingExpression (hash=35059110): TransferValue - using final value ObservableCollection`1 (hash=12781633 Count=0)
System.Windows.Data Warning: 52 : Created BindingExpression (hash=12661120) for Binding (hash=31408037)
System.Windows.Data Warning: 54 :   Path: ''
System.Windows.Data Warning: 56 : BindingExpression (hash=12661120): Default mode resolved to OneWay
System.Windows.Data Warning: 57 : BindingExpression (hash=12661120): Default update trigger resolved to PropertyChanged
System.Windows.Data Warning: 58 : BindingExpression (hash=12661120): Attach to Xceed.Wpf.DataGrid.DataGridControl.ItemsSource (hash=16991442)
System.Windows.Data Warning: 63 : BindingExpression (hash=12661120): Resolving source 
System.Windows.Data Warning: 66 : BindingExpression (hash=12661120): Found data context element: <null> (OK)
System.Windows.Data Warning: 72 : BindingExpression (hash=12661120): Use View from DataGridCollectionViewSource (hash=28137373)
System.Windows.Data Warning: 74 : BindingExpression (hash=12661120): Activate with root item DataGridCollectionView (hash=49343907 Count=0)
System.Windows.Data Warning: 100 : BindingExpression (hash=12661120): Replace item at level 0 with DataGridCollectionView (hash=49343907 Count=0), using accessor {DependencyProperty.UnsetValue}
System.Windows.Data Warning: 97 : BindingExpression (hash=12661120): GetValue at level 0 from DataGridCollectionView (hash=49343907 Count=0) using <null>: Data``GridCollectionView (hash=49343907 Count=0)
System.Windows.Data Warning: 76 : BindingExpression (hash=12661120): TransferValue - got raw value DataGridCollectionView (hash=49343907 Count=0)
System.Windows.Data Warning: 85 : BindingExpression (hash=12661120): TransferValue - using final value DataGridCollectionView (hash=49343907 Count=0)
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll

Answer 1

不确定您的问题是什么，绑定（除了缺少的结尾引号）似乎没问题。以下代码对我来说很好。

public class Quotes
{
    public string Description { get; set; }
    public decimal Value { get; set; }
}

public class ApplicationPresenter
{
    public ApplicationPresenter()
    {
        PriceList = new ObservableCollection<Quotes>()
        {
            new Quotes(){Description="Quote One", Value=10m},
            new Quotes(){Description="Quote Two", Value=10m},
            new Quotes(){Description="Quote Three", Value=10m},
            new Quotes(){Description="Quote Four", Value=10m},
        };
    }
    public ObservableCollection<Quotes> PriceList { get; private set; }
}

<Window 
    x:Class="ObjectDataProviderPresenterSample.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:xcdg="http://schemas.xceed.com/wpf/xaml/datagrid"
    xmlns:local="clr-namespace:ObjectDataProviderPresenterSample"
    Title="Window1" 
    Height="300" 
    Width="300" 
    >
    <Window.Resources>
        <ObjectDataProvider 
            x:Key="ApplicationPresenterDS" 
            ObjectType="{x:Type local:ApplicationPresenter}" 
            />
        <xcdg:DataGridCollectionViewSource 
            x:Key="price_list" 
            Source="{Binding 
                        Source={StaticResource ApplicationPresenterDS}, 
                        Path=PriceList}" 
            />            
    </Window.Resources>  

    <Grid>
        <xcdg:DataGridControl ItemsSource="{Binding Source={StaticResource price_list}}" />
    </Grid>
</Window>

Answer 2

我不确定，因为从您的代码中不太清楚数据是否转到PriceList，但我看到的是这个集合在第二个xaml中只是空的。

在两种情况下在xaml中创建ObjectDataProvider只是通过默认构造函数创建ApplicationPresenter类型的对象。您的构造函数创建空集合PriceList。（Ian的构造函数创建PriceList并用假数据填充它。这就是他的例子有效的原因。）

因此，您的示例的第二个xaml中的DataGridCollectionViewSource基本上是指具有空PriceList的ApplicationPresenter。

相比之下，第一个xaml指的是WebSitePricesView的PriceList，我相信，在给定的代码片段之外，它在某种程度上被填充了。

如果我的理论是好的，从第一个xaml中删除ObjectDataProvider将不会产生任何结果 - 它将起作用，因为数据直接转到presenter.PriceList。

但是，我不确定。

等效的WPF绑定语法

2 个答案: