我有一个使用MVVM模式的WPF应用程序。
在用户控件上，我有两个DataGrid，它们的ItemsSource绑定到两个不同的属性。
其中一个DataGrid正确填充，但另一个不是。
我无法弄清楚绑定有什么问题。我已经尝试显式设置DataGrid的DataContext不起作用，但我不确定为什么我应该这样做，或者在哪里做。
我已经验证了检索数据的工作正常，因为我可以调试并查看数据，而DataGrid包含可点击的行，而且没有文字显示。
AssignItemsToCategoryViewModel.cs
/// <summary>
/// Describes the name that will be used for the menu option
/// Implemented from IPageViewModel
/// </summary>
public string Name
{
get { return "Assign Items To Categories "; }
}
#region Categories
private CategoryModel _currentCategory;
public CategoryModel CurrentCategory
{
get { return _currentCategory; }
set
{
_currentCategory = value;
OnPropertyChanged("CurrentCategory");
}
}
public ObservableCollection<CategoryModel> Categories = new ObservableCollection<CategoryModel>();
public RelayCommand GetCategoriesRelay;
public AssignItemsToCategoryViewModel ()
{
CurrentCategory = new CategoryModel();
CurrentStockItem = new StockItemModel();
}
#region Get Categories Command
/// <summary>
/// The interface command
/// to run the get GetCategories method
/// </summary>
public ICommand GetCategoriesCommand
{
get
{
GetCategoriesRelay = new RelayCommand(p => GetCategories(),
p => CanGetCategories());
return GetCategoriesRelay;
}
}
/// <summary>
/// Checks whether the GetCategories command can be run
/// </summary>
/// <returns>True or False</returns>
private bool CanGetCategories()
{
return true;
}
/// <summary>
/// Method to fetch the categories
/// </summary>
private void GetCategories()
{
Categories = CurrentCategory.GetCategories();
ReceivedCategories = Categories;
if (Categories.Any())
SelectedIndex = 0;
}
#endregion
/// <summary>
/// Gets or sets the DataGrid's selected index
/// Used to set the index to 0 if any categories exist.
/// </summary>
private int _selectedIndex;
public int SelectedIndex
{
get { return _selectedIndex; }
set
{
_selectedIndex = value;
OnPropertyChanged("SelectedIndex");
}
}
/// <summary>
/// Gets or sets the collection of received categories
/// </summary>
public ObservableCollection<CategoryModel> ReceivedCategories
{
get { return Categories; }
set
{
Categories = value;
OnPropertyChanged("ReceivedCategories");
}
}
#endregion
#region Stock Items
private StockItemModel _currentStockItem;
public StockItemModel CurrentStockItem
{
get { return _currentStockItem; }
set
{
_currentStockItem = value;
OnPropertyChanged("CurrentStockItem");
}
}
public ObservableCollection<StockItemModel> StockItems = new ObservableCollection<StockItemModel>();
public RelayCommand GetStockItemsRelay;
public RelayCommand LinkItemRelay;
public RelayCommand UnlinkItemRelay;
#region Get Stock Items Command
/// <summary>
/// The interface command
/// to run the get GetStockItems method
/// </summary>
public ICommand GetStockItemsCommand
{
get
{
GetStockItemsRelay = new RelayCommand(p => GetStockItems(),
p => CanGetStockItems());
return GetStockItemsRelay;
}
}
/// <summary>
/// Checks whether the GetStockItems command can be run
/// </summary>
/// <returns>True or False</returns>
private bool CanGetStockItems()
{
return true;
}
/// <summary>
/// Method to fetch the stock items
/// </summary>
private void GetStockItems()
{
StockItems = CurrentStockItem.GetStockItems();
ReceivedStockItems = StockItems;
if (ReceivedStockItems.Any())
SelectedStockItemIndex = 0;
}
#endregion
/// <summary>
/// Gets or sets the Stock Items DataGrid's selected index
/// Used to set the index to 0 if any stock items exist.
/// </summary>
private int _selectedStockItemIndex;
public int SelectedStockItemIndex
{
get { return _selectedStockItemIndex; }
set
{
_selectedStockItemIndex = value;
OnPropertyChanged("SelectedStockItemIndex");
}
}
/// <summary>
/// Gets or sets the CurerntStockItem Id
/// </summary>
public long? StockLinkId
{
get { return CurrentStockItem.StockLink; }
set
{
CurrentStockItem.StockLink = value;
OnPropertyChanged("StockLinkId");
}
}
/// <summary>
/// Gets or sets the CurrentStockItem ItemCode
/// </summary>
public string ItemCode
{
get
{
return CurrentStockItem.ItemCode;
}
set
{
CurrentStockItem.ItemCode = value;
OnPropertyChanged("ItemCode");
}
}
/// <summary>
/// Gets or sets the collection of received categories
/// </summary>
public ObservableCollection<StockItemModel> ReceivedStockItems
{
get { return StockItems; }
set
{
StockItems = value;
OnPropertyChanged("ReceivedStockItems");
}
}
#endregion
}
AssignItemsToCategoryView.xaml
<UserControl x:Class="SalesLinker.View.AssignItemsToCategoryView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="600" Background="White">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Loaded">
<i:InvokeCommandAction Command="{Binding GetCategoriesCommand}" />
<i:InvokeCommandAction Command="{Binding GetStockItemsCommand}" />
</i:EventTrigger>
</i:Interaction.Triggers>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="45"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="250"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Border Grid.Column="0" Grid.Row="0" Grid.RowSpan="2" VerticalAlignment="Stretch"
Style="{StaticResource MainBorderStyle}" >
<HeaderedContentControl x:Name="ItemsList"
Style="{StaticResource MainHCCStyle}"
Header="Items">
<DataGrid x:Name="LstItems" Grid.Column="0" Grid.Row="1" AutoGenerateColumns="false" IsReadOnly="True"
ItemsSource="{Binding Path=ReceivedStockItems, Mode=TwoWay}"
HorizontalScrollBarVisibility="Disabled" GridLinesVisibility="None"
CanUserAddRows="False" CanUserDeleteRows="False" CanUserSortColumns="True" Background="White"
SelectedIndex="{Binding Path=SelectedStockItemIndex}" >
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Path=ItemCode}" IsReadOnly="True" Header="Item Code" Width="300" />
</DataGrid.Columns>
</DataGrid>
</HeaderedContentControl>
</Border>
<DockPanel Grid.Row="1" Grid.Column="1">
<StackPanel VerticalAlignment="Center" >
<StackPanel.Resources>
<Style TargetType="{x:Type Button}">
<Setter Property="Margin" Value="0,10,0,0"/>
</Style>
</StackPanel.Resources>
<Button Command="{Binding LinkItemCommand}" Height="50" Width="50" Background="Transparent" BorderThickness="0" BorderBrush="Transparent"
CommandParameter="{Binding ElementName=TbDescription, Path=Text}">
<Image Source="/Images/RightArrow.png"/>
</Button>
<Button Command="{Binding UnlinkItemCommand}" Height="50" Width="50" Background="Transparent" BorderThickness="0" BorderBrush="Transparent"
CommandParameter="{Binding SelectedItem.CategoryID, ElementName=LstCategories, Mode=OneWay }" >
<Image Source="/Images/LeftArrow.png"/>
</Button>
</StackPanel>
</DockPanel>
<Border Grid.Column="2" Grid.Row="0" Grid.RowSpan="2" VerticalAlignment="Stretch"
Style="{StaticResource MainBorderStyle}" >
<HeaderedContentControl x:Name="CategoryItems"
Style="{StaticResource MainHCCStyle}"
Header="Categories">
<DataGrid x:Name="LstCategories" Grid.Column="0" Grid.Row="1" AutoGenerateColumns="false" IsReadOnly="True"
ItemsSource="{Binding Path=ReceivedCategories, Mode=TwoWay}"
HorizontalScrollBarVisibility="Disabled" GridLinesVisibility="None"
CanUserAddRows="False" CanUserDeleteRows="False" CanUserSortColumns="True" Background="White"
SelectedIndex="{Binding Path=SelectedIndex}">
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Path=Description}" IsReadOnly="True" Header="Description" Width="300" />
</DataGrid.Columns>
</DataGrid>
</HeaderedContentControl>
</Border>
</Grid>
名为LstCategories的DataGrid按预期工作，但LstItems是问题所在。
答案 0 :(得分：1)
所以问题真的很傻。我想如果我展示了我的模型课程，大多数人会立即发现它。
我忘了在我的模型类
上添加getter和setter到我的属性所以我有
public string ItemCode;
而不是：
public string ItemCode {get; set;}