我有一个ListView
,我必须在其中显示从数据库表中提取的所有行。我必须在每一行中给出两个编辑和删除按钮。由于我是初学者,我在XAML中尝试了以下代码 -
<ListView Height="352" HorizontalAlignment="Left" Margin="20,90,0,0" Name="Tab1lstProductCategories" VerticalAlignment="Top" Width="1008">
<ListView.View>
<GridView>
<GridViewColumn Header="Category Name" DisplayMemberBinding="{Binding Col1}" Width="200"/>
<GridViewColumn Header="Created Date" DisplayMemberBinding="{Binding Col2}" Width="200"/>
<GridViewColumn Header="Last Updated" DisplayMemberBinding="{Binding Col3}" Width="200"/>
<GridViewColumn Header="Edit" Width="200">
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button Content="Edit" Click="EditCategory" CommandParameter="{Binding Id}"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Delete" Width="200">
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button Content="Delete" Click="DeleteCategory"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
在C#中我写了 -
DataTable dt=db.Select("select * from ProductCategories");
for (int i = 0; i < dt.Rows.Count; i++)
{
//Button edit, delete;
//edit = new Button();
//edit.Content="Edit";
//edit.Click += EditCategory;
//delete= new Button();
//delete.Content="Delete";
//delete.Click += DeleteCategory;
//edit.CommandParameter = dt.Rows[i]["Id"];
//delete.CommandParameter = dt.Rows[i]["Id"];
Tab1lstProductCategories.Items.Add(new { Col1 = dt.Rows[i]["CategoryName"], Col2 = dt.Rows[i]["CreatedDate"], Col3=dt.Rows[i]["LastUpdated"]});
}
private void EditCategory(object sender, RoutedEventArgs e)
{
Button b=sender as Button;
MessageBox.Show(b.CommandParameter.ToString());
}
private void DeleteCategory(object sender, RoutedEventArgs e)
{
}
我得到了结果 -
我想要那边的按钮,请帮帮我。
答案 0 :(得分:19)
好的,所以我发现您的代码存在一些问题。
1)你真的应该创建一个像@HighCore建议的正确数据类型。看看你的代码,我认为它看起来像这样:
public class ProductCategory
{
public int Id { get; set; }
public string CategoryName { get; set; }
public DateTime CreatedDate { get; set; }
public DateTime LastUpdated { get; set; }
}
然后创建ProductCategory
的集合,而不是直接添加匿名类型
DataTable dt=db.Select("select * from ProductCategories");
// Create a collection for your types
ObservableCollection<ProductCategory> list = new ObservableCollection<ProductCategory>();
for (int i = 0; i < dt.Rows.Count; i++)
{
ProductCategory productCategory = new ProductCategory
{
// Casting might be needed here depending on your data types ...
Id = dt.Rows[i]["Id"],
CategoryName = dt.Rows[i]["CategoryName"],
CreatedDate = dt.Rows[i]["CreatedDate"],
LastUpdated = dt.Rows[i]["LastUpdated"]
};
list.Add(productCategory);
}
2)您正在将项目直接添加到错误的ListView
。您应该做的是将您的收藏设置为ItemsSource
的{{1}}。
ListView
3)使用CellTemplate
通过xaml实现Tab1lstProductCategories.ItemsSource = list;
想要的外观并将ListView
绑定更改为相应的属性后,可以将DisplayMemberBinding
绑定到默认值CommandParameter
表达式,它将命令参数设置为它所代表的{Binding}
项。
ProductCategory
通过事件处理程序 - <ListView Height="352" HorizontalAlignment="Left" Margin="20,90,0,0" Name="Tab1lstProductCategories" VerticalAlignment="Top" Width="1008">
<ListView.View>
<GridView>
<GridViewColumn Header="Category Name" DisplayMemberBinding="{Binding CategoryName}" Width="200"/>
<GridViewColumn Header="Created Date" DisplayMemberBinding="{Binding CreatedDate}" Width="200"/>
<GridViewColumn Header="Last Updated" DisplayMemberBinding="{Binding LastUpdated}" Width="200"/>
<GridViewColumn Header="Edit" Width="200">
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button Content="Edit" Click="EditCategory" CommandParameter="{Binding}"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Delete" Width="200">
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button Content="Delete" Click="DeleteCategory" CommandParameter="{Binding}"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
和EditCategory
,您可以提取DeleteCategory
ProductCategory
这应该足以使你的代码工作,但我还有其他几点要做
一个。您应该高度考虑使用MVVM模式。这意味着不会在后面的代码中使用事件处理程序,而是使用Commands代替,并使用private void EditCategory(object sender, RoutedEventArgs e)
{
Button b=sender as Button;
ProductCategory productCategory = b.CommandParameter as ProductCategory;
MessageBox.Show(productCategory.Id);
}
原来打算使用的方式。
湾考虑一些ORM框架,而不是将数据库直接绑定到您的UI。这创造了令人难以置信的紧密耦合,这将使您的代码重复性更低,更灵活。
希望这有帮助