【发布时间】：2015-09-14 03:59:57
【问题描述】：
我创建了一个动态表单，允许用户使用 ItemsControl 添加项目的变体。
<ItemsControl x:Name="variationItemsControl"
ItemsSource="{Binding FormItem.Variations}"
Visibility="Collapsed">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width=".60*"/>
<ColumnDefinition Width=".30*"/>
</Grid.ColumnDefinitions>
<StackPanel Grid.Column="0" Margin="0,0,1,0">
<TextBlock
Foreground="White"
Text="Variation Name"/>
<TextBox
x:Name="variationName"
Style="{StaticResource FlyoutField}"
Text="{Binding VariationName, Mode=TwoWay}"/>
</StackPanel>
<StackPanel Grid.Column="1">
<TextBlock
Foreground="White"
Text="Price"/>
<TextBox
Style="{StaticResource FlyoutField}"
Text="{Binding VariationPrice, Mode=TwoWay}"/>
</StackPanel>
<Button
Grid.Column="2"
Margin="0,0,0,6"
Content="X"
HorizontalAlignment="Stretch"
Click="deleteVariationButton_Click"/>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
在网格中，有一个按钮，单击该按钮时，我希望会删除该模板实例。例如，在下图中，如果我单击 12 盎司的“X”按钮。项目，该项目应该被删除。
从 ItemsControl 的 ItemsSource 中删除该实例很简单，但我需要知道如何在“X”按钮单击事件中执行此操作。对象发送者是按钮本身，RoutedEventArgs 似乎没有包含任何我可以使用的相关信息。
private void deleteVariationButton_Click(object sender, RoutedEventArgs e)
{
// what do I do here?
}
是否可以获取我单击的“X”按钮所在的模板容器的索引？如果我能得到那个索引，那么它只是从 ItemsControl 的 ItemsSource 容器中删除。
编辑更多代码：
public class Item : ObservableObject, IEquatable<Item>
{
private string itemName;
public string ItemName
{
get { return itemName; }
set { Set<string>(() => ItemName, ref itemName, value.ToString().Trim()); }
}
private Category itemCategory;
public Category ItemCategory
{
get { return itemCategory; }
set { Set<Category>(() => ItemCategory, ref itemCategory, value); }
}
private decimal? singlePrice;
public decimal? SinglePrice
{
get { return singlePrice; }
set { Set<decimal?>(() => SinglePrice, ref singlePrice, value); }
}
private ObservableCollection<Variation> variations;
public ObservableCollection<Variation> Variations
{
get { return variations; }
set { Set<ObservableCollection<Variation>>(() => Variations, ref variations, value); }
}
private bool hasVariations;
public bool HasVariations
{
get { return hasVariations; }
set { Set<bool>(() => HasVariations, ref hasVariations, value); }
}
public Item()
{
itemCategory = new Category();
Variations = new ObservableCollection<Variation>();
}
public Item(Item other)
{
Copy(other);
}
public void Copy(Item other)
{
if (this != other)
{
ItemName = other.ItemName;
ItemCategory = new Category();
ItemCategory.CategoryName = other.ItemCategory.CategoryName;
ItemCategory.CategoryColor = other.ItemCategory.CategoryColor;
SinglePrice = other.SinglePrice;
Variations = new ObservableCollection<Variation>();
foreach (Variation v in other.variations)
{
variations.Add(new Variation(v));
}
}
}
public bool Equals(Item other)
{
if (variations.Count() != other.variations.Count())
return false;
for (int i = 0; i < variations.Count(); i++)
{
if (!variations.ElementAt(i).Equals(other.variations.ElementAt(i)))
return false;
}
if (itemName == other.itemName &&
itemCategory.CategoryName == other.itemCategory.CategoryName &&
itemCategory.CategoryColor == other.itemCategory.CategoryColor &&
singlePrice == other.singlePrice &&
hasVariations == other.hasVariations)
return true;
return false;
}
public class Variation : ObservableObject
{
public RelayCommand DeleteVariationCommand { get; private set; }
private string variationName;
public string VariationName
{
get { return variationName; }
set { Set<string>(() => VariationName, ref variationName, value.ToString().Trim()); }
}
private decimal? variationPrice;
public decimal? VariationPrice
{
get { return variationPrice; }
set { Set<decimal?>(() => VariationPrice, ref variationPrice, value); }
}
public Variation()
{
variationName = "";
variationPrice = 0M;
DeleteVariationCommand = new RelayCommand(
() => DeleteVariation(),
() => CanDeleteVariation());
}
public void DeleteVariation()
{
}
public bool CanDeleteVariation()
{
return true;
}
public Variation(Variation other)
{
variationName = other.variationName;
variationPrice = other.variationPrice;
}
public bool Equals(Variation other)
{
if (variationName.Equals(other.variationName) && variationPrice == other.variationPrice)
return true;
return false;
}
}
}
【问题讨论】：
-
尝试获取网格选中的行索引并删除
-
Variation 项目类应该公开一个删除命令，从
FormItem.Variations集合中删除它。您可以将 Button 的Command属性绑定到 Delete 命令，而不是使用 Button Click 处理程序。 -
@Clemens：谢谢。你让我走上了正确的道路。该命令只能在 FormItem.Variations 类中访问，但问题是我的 Variations 类嵌套在 Item 类中，因此我无法访问 Variations 集合以从中删除变体，除非它是静态的，这是不可能的在我的情况下，因为每个项目都需要自己的 Variations 集合。我似乎找不到方法。我已将我的 Item 类代码添加到帖子中。
标签： c# xaml data-binding windows-runtime windows-8.1