这是我在 StackOverflow 上的第一篇文章,也是我的第一个问题。我在 WPF 中使用 MVVM 模式(称为 Block)创建了一个 UserControl。此 UserControl 应在另一个 UserControl 中使用,作为 ListBox(称为 Sector)的 DataTemplate。
块控件应作为独立的和作为不同用户控件的 DataTemplate 使用。
如果我在 Block 的 View 中设置 DataContext,独立版本效果很好,但不是 Sector View 的一部分。
如果我没有在 Block 的视图中设置 DataContext,它可以在 Sector 中工作,但不是独立的。
我的问题是,这是将 DataContext 留在 Block 的 View 中并将其设置在我使用 Control 或 ViewModel 的 View 中的唯一方法吗?
这是我的代码:
模块型号:
public class BlockModel : ModelBase
{
#region private Variables
string blockName = "Block";
string blockContent = "00000";
#endregion private Variables
#region Properties
public string BlockName
{
get { return blockName; }
set { blockName = value; NotifyPropertyChange("BlockName "); }
}
public string BlockContent
{
get { return blockContent; }
set { blockContent = value; NotifyPropertyChange("BlockContent"); }
}
#endregion Properties
#region ctor
public BlockModel () { }
#endregion ctor
}
块的视图模型:
public class BlockViewModel : ViewModelBase
{
#region private Variables
string charToFill = "0";
DelegateCommand fillWithChar;
BlockModel dataModel = new BlockModel();
#endregion private Variables
#region Properties
public Models. BlockModel DataModel
{
get { return dataModel; }
set { dataModel = value; }
}
public string BlockContent
{
get { return dataModel. BlockContent; }
set
{
if (dataModel. BlockContent != value)
{
dataModel. BlockContent = value;
NotifyPropertyChange ("BlockContent");
}
}
}
public string BlockName
{
get { return dataModel. BlockName; }
set
{
if (dataModel. BlockName != value)
{
dataModel. BlockName = value;
NotifyPropertyChange("BlockName");
}
}
}
public string CharToFill
{
get { return charToFill; }
set
{
if (charToFill != value)
{
charToFill = value;
NotifyPropertyChange ("CharToFill");
}
}
}
public ICommand FillWithChar
{
get
{
if (fillWithChar == null)
fillWithChar = new DelegateCommand(FillText);
return fillWithChar;
}
}
#endregion Properties
#region ctor
public BlockViewModel()
{
}
#endregion ctor
#region Methods
private void FillText()
{
CodingBlockContent = CodingBlockContent.PadLeft(32, charToFill[0]);
}
#endregion Methods
}
块视图:
<UserControl x:Class="…./Block"
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:local="clr-namespace:…/Controls"
mc:Ignorable="d" d:DesignWidth="460" d:DesignHeight="44">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="124" />
<ColumnDefinition Width="301" />
<ColumnDefinition Width="30"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="30"></RowDefinition>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0" Text="{Binding BlockName}"
HorizontalAlignment="Left" VerticalAlignment="Center" FontSize="14" Margin="2,6"/>
<ComboBox FontFamily="Consolas" Grid.Row="00" Grid.Column="1"
Text="{Binding BlockContent, Mode=TwoWay}"
Tag="{Binding BlockName}" Name="cbxBlock" FontSize="14"
HorizontalAlignment="Left" VerticalAlignment="Center" Width="290" Margin="1,4,0,5" IsEditable="True" Height="26">
<ComboBoxItem Content=""></ComboBoxItem>
<ComboBoxItem Content="0000000000000"></ComboBoxItem>
<StackPanel HorizontalAlignment="Left" VerticalAlignment="Top" Orientation="Horizontal">
<TextBox Margin="10,2,0,2" Text="0" Width="24" FontSize="14" Name="tbxChar" MaxLength="1"></TextBox>
<TextBlock Margin="10,2,0,2" Text="auffüllen" VerticalAlignment="Center" FontSize="14"></TextBlock>
<Button Margin="10,2,0,2" Content="Ausführen" Width="100" Command="{Binding FillWithChar}"></Button>
</StackPanel>
</ComboBox>
<TextBlock Grid.Row="0" Width="30" Grid.Column="2" Text="{Binding CodingBlockContent.Length}"
HorizontalAlignment="Left" VerticalAlignment="Center" FontSize="14" Margin="2,6,0,6" Grid.ColumnSpan="2"/>
</Grid>
部门型号:
public class SectorModel
{
#region private Variables
int blockAmount = 4;
string sectorNumber = "Sektor";
int blockBegin = 0;
bool isSectorInUse = false;
#endregion private Variables
#region Properties
public string SectorNumber
{
get { return sectorNumber; }
set { sectorNumber = value;}
}
public int BlockBegin
{
get { return blockBegin; }
set
{
blockBegin = value;
}
}
public bool IsSectorInUse
{
get { return isSectorInUse; }
set { isSectorInUse = value;}
}
public int BlockAmount
{
get { return blockAmount; }
set
{
blockAmount = value;;
}
}
#endregion Properties
public SectorModel()
{
}
}
扇区视图模型:
public class SectorViewModel : ViewModelBase
{
#region private Variables
SectorModel dataModel = new SectorModel();
ObservableCollection<BlockViewModel> sectorBlocks = new ObservableCollection<BlockViewModel>();
#endregion private Variables
#region Properties
public SectorModel DataModel
{
get { return dataModel; }
set { dataModel = value; }
}
public ObservableCollection<BlockViewModel> SectorBlocks
{
get { return sectorBlocks; }
set { sectorBlocks = value; NotifyPropertyChange ("SectorBlocks"); }
}
public string SectorNumber
{
get { return "Sektor " + DataModel.SectorNumber; }
set { DataModel.SectorNumber = value; NotifyPropertyChange ("SectorNumber"); }
}
public int BlockBegin
{
get { return DataModel.BlockBegin; }
set
{
DataModel.BlockBegin = value;
SetBlocks();
OnPropertyChanged("BlockBegin");
}
}
public bool IsSectorInUse
{
get { return DataModel.IsSectorInUse; }
set { DataModel.IsSectorInUse = value; NotifyPropertyChange ("IsSectorInUse"); }
}
public int BlockAmount
{
get { return DataModel.BlockAmount; }
set
{
DataModel.BlockAmount = value;
SetBlocks();
NotifyPropertyChange ("CodingBlockAmount");
}
}
#endregion Properties
void SetBlocks()
{
while (SectorBlocks.Count != BlockAmount)
{
SectorBlocks.Add(new BlockViewModel());
}
int begin = BlockBegin;
foreach (BlockViewModel block in SectorBlocks)
{
block.CodingBlockName = "Block " + begin.ToString().PadLeft(2, '0');
block++;
}
}
public SectorViewModel()
{
SetBlocks();
}
}
部门视图:
<UserControl xmlns:Views="clr-namespace:…/RFIDControls" x:Class="…/Sector"
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"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="473">
<Border BorderBrush="Black" BorderThickness="0,0,0,1">
<Expander Name="expMain" Margin="0,0,4,0">
<Expander.Header>
<Grid Name="grdHeader">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100" />
<ColumnDefinition Width="300" />
<ColumnDefinition Width="30" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Grid.Row="0" Height="24" Text="{Binding SectorNumber}" HorizontalAlignment="Left" VerticalAlignment="Center" FontSize="14" FontWeight="Bold" Panel.ZIndex="98"/>
<CheckBox Grid.Column="2" VerticalAlignment="Center" IsChecked="{Binding IsSectorInUse}"></CheckBox>
</Grid>
</Expander.Header>
<Grid>
<ListBox ItemsSource="{Binding SectorBlocks}" Name="listBox">
<ListBox.ItemTemplate>
<DataTemplate DataType="{x:Type Views:BlockViewModel}">
<Views:Block/>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
</Expander>
</Border>
谢谢你。
来自德国的亲切问候
多米尼克
PS:我希望我的英语没有我想象的那么差