我怎样才能绑定自定义属性从视图视图模型上code后面？ [英] How can I bind custom properties from View to ViewModel on code behind?
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问题描述
我做了一个页面的MainPage 和用户控件寻呼机。两者都有自己的视图模型。在寻呼机，有三个依赖属性行，列 ，来源。我想从寻呼机的观寻呼机的视图模型通过这些属性。我想这对查看的code后面。但它不工作...的设置在 PagerViewModel 物业从来没有在调试调用。请帮我...
下面是详细的机制：
MainPageViewModel
↓与绑定值传递
的MainPage
↓与设定值THT性质从 MainPagerViewModel
寻呼机（code后面）
↓绑定属性PagerViewModel＆LT; ---这部分是问题！
PagerViewModel
↓与绑定值传递
寻呼机（XAML）
和这里是源
[MainPageViewModel.cs]
System.Collections中使用;
使用System.Collections.Generic;
使用System.Collections.ObjectModel;
使用System.Linq的;
使用System.Windows;
使用System.Windows.Controls的;
使用System.Windows.Data;
使用System.Windows.Media;
使用Client.Model;命名空间Client.ViewModel
{
公共类MainPageViewModel：ViewModelBase
{
...
公众的ObservableCollection＆LT; IPagableEntry＆GT; PagerTableCategoriesItems {{返回TableCategoryRepository.Instance.TableCategories; }} 公众诠释PagerTableCategoriesRows {{返回1; }} 公众诠释PagerTableCategoriesColumns {{返回3; }}
...
}
}
[MainPage.xaml中]
＆LT;页的xmlns =http://schemas.microsoft.com/winfx/2006/xaml/$p$psentation
的xmlns：X =http://schemas.microsoft.com/winfx/2006/xaml
的xmlns：鉴于=CLR的命名空间：Client.View
的xmlns：视图模型=CLR的命名空间：Client.ViewModel
的xmlns：resStr =CLR的命名空间：Client.CommonResources.String
X：类=Client.View.MainPage
风格={StaticResource的共同}＆GT;
＆LT; Page.DataContext＆GT;
＆LT;视图模型：MainPageViewModel /＆GT;
＆LT; /Page.DataContext>
... ＆LT;查看：传呼机X：NAME =pagerTableCategories
来源={绑定路径= PagerTableCategoriesItems}
行={绑定路径= PagerTableCategoriesRows}
列={绑定路径= PagerTableCategoriesColumns}＆GT;
＆LT; /视图：寻呼机GT;
...
＆LT; /页＆GT;
[Pager.xaml.cs]
使用系统;
System.Collections中使用;
使用System.Collections.Generic;
使用System.Collections.ObjectModel;
使用System.ComponentModel;
使用System.Linq的;
使用System.Runtime.CompilerServices;
使用System.Text;
使用System.Threading.Tasks;
使用System.Windows;
使用System.Windows.Controls的;
使用System.Windows.Controls.Primitives;
使用System.Windows.Data;
使用System.Windows.Input;
使用Client.Model;
使用Client.ViewModel;命名空间Client.View
{
公共部分类寻呼机
{ 公共静态只读的DependencyProperty在SourceProperty = DependencyProperty.Register（源，typeof运算（的ObservableCollection＆LT; IPagableEntry＆GT;）的typeof（寻呼机），新PropertyMetadata（NULL，OnSourceChanged））;
公共静态只读的DependencyProperty RowsProperty = DependencyProperty.Register（行的typeof（INT）的typeof（寻呼机），新PropertyMetadata（1，OnRowsChanged））;
公共静态只读的DependencyProperty ColumnsProperty = DependencyProperty.Register（列的typeof（INT）的typeof（寻呼机），新PropertyMetadata（1，OnColumnsChanged））;
公共静态只读的DependencyProperty SelectedEntryProperty = DependencyProperty.Register（SelectedEntry的typeof（对象）的typeof（寻呼机），新PropertyMetadata（NULL，OnSelectedEntryChanged））; 公众诠释行
{
{返回（INT）的GetValue（RowsProperty）; }
集合{的SetValue（RowsProperty，值）; }
} 公众诠释列
{
{返回（INT）的GetValue（ColumnsProperty）; }
集合{的SetValue（ColumnsProperty，值）; }
} 公共对象SelectedEntry
{
{返回的GetValue（SelectedEntryProperty）; }
集合{的SetValue（SelectedEntryProperty，值）; } } 公众的ObservableCollection＆LT; IPagableEntry＆GT;资源
{
{返回（的ObservableCollection＆LT; IPagableEntry＆GT;）的GetValue（在SourceProperty）; }
集合{的SetValue（在SourceProperty，值）; }
} 公共寻呼机（）
{
的InitializeComponent（）; //我要绑定的三个自定义属性（行，列，资料）以PagerViewModel的行，列，集合
结合bindingRows =新的绑定（行）;
bindingRows.Mode = BindingMode.TwoWay;
bindingRows.Source = gridPager.DataContext;
gridPager.SetBinding（RowsProperty，bindingRows）; 结合bindingColumns =新的绑定（列）;
bindingColumns.Mode = BindingMode.TwoWay;
bindingColumns.Source = gridPager.DataContext;
gridPager.SetBinding（ColumnsProperty，bindingColumns）; 绑定的BindingSource =新的绑定（集合）;
bindingSource.Mode = BindingMode.TwoWay;
bindingSource.Source = gridPager.DataContext;
gridPager.SetBinding（在SourceProperty，BindingSource的）;
} 私人无效ListBoxEntriesOnSelectionChanged（对象发件人，SelectionChangedEventArgs E）
{
SelectedEntry =（发件人为列表框）.SelectedItem;
} 私有静态无效OnSelectedEntryChanged（DependencyObject的寻呼机，DependencyPropertyChangedEventArgs E）
{
（寻呼机寻呼机）.SelectedEntry = e.NewValue;
} 私有静态无效OnSourceChanged（DependencyObject的寻呼机，DependencyPropertyChangedEventArgs E）
{
（寻呼机寻呼机）.Source =（的ObservableCollection＆LT; IPagableEntry＆GT;）e.NewValue;
} 私有静态无效OnRowsChanged（DependencyObject的寻呼机，DependencyPropertyChangedEventArgs E）
{
（寻呼机寻呼机）.Rows =（INT）e.NewValue;
} 私有静态无效OnColumnsChanged（DependencyObject的寻呼机，DependencyPropertyChangedEventArgs E）
{
（寻呼机寻呼机）.Columns =（INT）e.NewValue;
} }
}
[Pager.xaml]
＆LT;用户控件的xmlns =http://schemas.microsoft.com/winfx/2006/xaml/$p$psentation
的xmlns：X =http://schemas.microsoft.com/winfx/2006/xaml
的xmlns：鉴于=CLR的命名空间：Client.View
的xmlns：视图模型=CLR的命名空间：Client.ViewModel
的xmlns：resStr =CLR的命名空间：Client.CommonResources.String
X：类=Client.View.Pager＆GT;
＆LT;电网X：NAME =gridPager＆GT;
＆LT; Grid.DataContext＆GT;
＆LT;视图模型：PagerViewModel /＆GT;
＆LT; /Grid.DataContext> ... ＆LT; ListBox的X：名称=listBoxEntries
的ItemsSource ={绑定路径=集合}
了borderThickness =0
余量=0
风格={StaticResource的共同}
HorizontalContentAlignment =弹力
VerticalContentAlignment =弹力
的ItemTemplate ={StaticResource的templateTableCategory}
的SelectedItem ={绑定路径= SelectedEntry，模式=双向}
的SelectionChanged =ListBoxEntriesOnSelectionChanged＆GT;
＆LT; ListBox.ItemsPanel＆GT;
＆LT; ItemsPanelTemplate＆GT;
＆LT; UniformGrid行={绑定路径=行}
列={绑定路径=列}
IsItemsHost =真/＆GT;
＆LT; / ItemsPanelTemplate＆GT;
＆LT; /ListBox.ItemsPanel>
＆LT; /列表框＆GT; ... ＆LT; /网格和GT;
＆LT; /用户控件＆GT;
[PagerViewModel.cs]
System.Collections中使用;
使用System.Collections.Generic;
使用System.Collections.ObjectModel;
使用System.Linq的;
使用System.Windows.Data;
使用System.Windows.Media;
使用Client.Model;命名空间Client.ViewModel
{
公共类PagerViewModel：ViewModelBase
{ ... 的ListCollectionView _listCollectionView;
的ObservableCollection＆LT; IPagableEntry＆GT; _采集;
诠释_rows;
INT _columns; 公众诠释行
{
{返回_rows; }
组
{
_rows =价值;
OnPropertyChanged（）;
}
} 公众诠释列
{
{返回_columns; }
组
{
_columns =价值;
OnPropertyChanged（）;
}
} 公众的ListCollectionView的ListCollectionView
{
{返回_listCollectionView; }
组
{
_listCollectionView =价值;
OnPropertyChanged（）;
}
} 公众的ObservableCollection＆LT; IPagableEntry＆GT;采集
{
得到
{
返回_collection;
} 组
{
_collection =价值;
OnPropertyChanged（）;
}
} ... }
}
解决方案
据我能理解这个问题是二的ViewModels之间创建一个同步机制。我和彼得的理论完全agry，但我建议你在下次同步解决方案。为了解决这个问题，我想建议你使用一个模型水平同步化。只要把你所需的详细信息到一个光模型类，并注入这个小模型成所需的ViewModels。下面是该方案：
![](\"http://i.stack.imgur.com/Am4To.png\")
问候，
I made a Page MainPage and a UserControl Pager. Both have their ViewModel. In Pager, there are three dependency properties Rows, Columns, Source. I want to pass these properties from Pager's View to Pager's ViewModel. I tried this on View's code behind. But it doesn't work...the set property in PagerViewModel never be called on debugging. Please, help me...
Here is detail mechanism:
MainPageViewModel
↓Pass the values with binding
MainPage
↓Set tht properties with values from MainPagerViewModel
Pager(code behind)
↓Bind the properties to PagerViewModel <--- This part is PROBLEM!!!
PagerViewModel
↓Pass the values with binding
Pager(XAML)
and here is source
[MainPageViewModel.cs]
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Media;
using Client.Model;
namespace Client.ViewModel
{
public class MainPageViewModel : ViewModelBase
{
...
public ObservableCollection<IPagableEntry> PagerTableCategoriesItems { get { return TableCategoryRepository.Instance.TableCategories; } }
public int PagerTableCategoriesRows { get { return 1; } }
public int PagerTableCategoriesColumns { get { return 3; } }
...
}
}
[MainPage.xaml]
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:view="clr-namespace:Client.View"
xmlns:viewModel="clr-namespace:Client.ViewModel"
xmlns:resStr="clr-namespace:Client.CommonResources.String"
x:Class="Client.View.MainPage"
Style="{StaticResource common}">
<Page.DataContext>
<viewModel:MainPageViewModel />
</Page.DataContext>
...
<view:Pager x:Name="pagerTableCategories"
Source="{Binding Path=PagerTableCategoriesItems}"
Rows="{Binding Path=PagerTableCategoriesRows}"
Columns="{Binding Path=PagerTableCategoriesColumns}">
</view:Pager>
...
</Page>
[Pager.xaml.cs]
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Input;
using Client.Model;
using Client.ViewModel;
namespace Client.View
{
public partial class Pager
{
public static readonly DependencyProperty SourceProperty = DependencyProperty.Register("Source", typeof(ObservableCollection<IPagableEntry>), typeof(Pager), new PropertyMetadata(null, OnSourceChanged));
public static readonly DependencyProperty RowsProperty = DependencyProperty.Register("Rows", typeof(int), typeof(Pager), new PropertyMetadata(1, OnRowsChanged));
public static readonly DependencyProperty ColumnsProperty = DependencyProperty.Register("Columns", typeof(int), typeof(Pager), new PropertyMetadata(1, OnColumnsChanged));
public static readonly DependencyProperty SelectedEntryProperty = DependencyProperty.Register("SelectedEntry", typeof(object), typeof(Pager), new PropertyMetadata(null, OnSelectedEntryChanged));
public int Rows
{
get { return (int)GetValue(RowsProperty); }
set { SetValue(RowsProperty, value); }
}
public int Columns
{
get { return (int)GetValue(ColumnsProperty); }
set { SetValue(ColumnsProperty, value); }
}
public object SelectedEntry
{
get { return GetValue(SelectedEntryProperty); }
set { SetValue(SelectedEntryProperty, value); }
}
public ObservableCollection<IPagableEntry> Source
{
get { return (ObservableCollection<IPagableEntry>)GetValue(SourceProperty); }
set { SetValue(SourceProperty, value); }
}
public Pager()
{
InitializeComponent();
// I want to bind the three custom properties(Rows, Columns, Source) to PagerViewModel's Rows, Columns, Collection
Binding bindingRows = new Binding("Rows");
bindingRows.Mode = BindingMode.TwoWay;
bindingRows.Source = gridPager.DataContext;
gridPager.SetBinding(RowsProperty, bindingRows);
Binding bindingColumns = new Binding("Columns");
bindingColumns.Mode = BindingMode.TwoWay;
bindingColumns.Source = gridPager.DataContext;
gridPager.SetBinding(ColumnsProperty, bindingColumns);
Binding bindingSource = new Binding("Collection");
bindingSource.Mode = BindingMode.TwoWay;
bindingSource.Source = gridPager.DataContext;
gridPager.SetBinding(SourceProperty, bindingSource);
}
private void ListBoxEntriesOnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
SelectedEntry = (sender as ListBox).SelectedItem;
}
private static void OnSelectedEntryChanged(DependencyObject pager, DependencyPropertyChangedEventArgs e)
{
(pager as Pager).SelectedEntry = e.NewValue;
}
private static void OnSourceChanged(DependencyObject pager, DependencyPropertyChangedEventArgs e)
{
(pager as Pager).Source = (ObservableCollection<IPagableEntry>)e.NewValue;
}
private static void OnRowsChanged(DependencyObject pager, DependencyPropertyChangedEventArgs e)
{
(pager as Pager).Rows = (int)e.NewValue;
}
private static void OnColumnsChanged(DependencyObject pager, DependencyPropertyChangedEventArgs e)
{
(pager as Pager).Columns = (int)e.NewValue;
}
}
}
[Pager.xaml]
<UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:view="clr-namespace:Client.View"
xmlns:viewModel="clr-namespace:Client.ViewModel"
xmlns:resStr="clr-namespace:Client.CommonResources.String"
x:Class="Client.View.Pager">
<Grid x:Name="gridPager">
<Grid.DataContext>
<viewModel:PagerViewModel />
</Grid.DataContext>
...
<ListBox x:Name="listBoxEntries"
ItemsSource="{Binding Path=Collection}"
BorderThickness="0"
Margin="0"
Style="{StaticResource common}"
HorizontalContentAlignment="Stretch"
VerticalContentAlignment="Stretch"
ItemTemplate="{StaticResource templateTableCategory}"
SelectedItem="{Binding Path=SelectedEntry, Mode=TwoWay}"
SelectionChanged="ListBoxEntriesOnSelectionChanged">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<UniformGrid Rows="{Binding Path=Rows}"
Columns="{Binding Path=Columns}"
IsItemsHost="True"/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
...
</Grid>
</UserControl>
[PagerViewModel.cs]
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Windows.Data;
using System.Windows.Media;
using Client.Model;
namespace Client.ViewModel
{
public class PagerViewModel : ViewModelBase
{
...
ListCollectionView _listCollectionView;
ObservableCollection<IPagableEntry> _collection;
int _rows;
int _columns;
public int Rows
{
get { return _rows; }
set
{
_rows = value;
OnPropertyChanged();
}
}
public int Columns
{
get { return _columns; }
set
{
_columns = value;
OnPropertyChanged();
}
}
public ListCollectionView ListCollectionView
{
get { return _listCollectionView; }
set
{
_listCollectionView = value;
OnPropertyChanged();
}
}
public ObservableCollection<IPagableEntry> Collection
{
get
{
return _collection;
}
set
{
_collection = value;
OnPropertyChanged();
}
}
...
}
}
解决方案
As I can understand the problem is the creating a synchronization mechanism between two viewmodels. I'm completely agry with Peter's theory, but I suggest you the next synchronization solution. To solve this problem I'd like to advice you to use a model level syncronization. Just put your required details into a light model class and inject this small model into desired viewmodels. Here is the scheme:
regards,
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