这里的WPF难以置信。我将设置场景: 我有一个带有费用列表的ListView,其中包含以下内容:
费用类型存储在我的数据库中的单独表格中,并通过外键expense_type_id链接到费用。
我试图获取一个没有费用类型的费用清单,并允许用户从选项列表中设置费用类型(即费用类型表中的数据) 。
为此,我创建了一个ListView,它在没有expense_type_id的情况下保存费用。
<ListView x:Name="lvAllocation" HorizontalAlignment="Left" Height="475" Margin="0,44,0,0" VerticalAlignment="Top" Width="1308" FontSize="16">
<ListView.View>
<GridView>
<GridViewColumn Header="Posted" Width="120" DisplayMemberBinding="{Binding ex_posted_date}" />
<GridViewColumn Header="Trans" Width="120" DisplayMemberBinding="{Binding ex_trans_date}" />
<GridViewColumn Header="Description" Width="120" DisplayMemberBinding="{Binding ex_description}" />
<GridViewColumn Header="Amount" Width="120" DisplayMemberBinding="{Binding ex_amount}" />
<GridViewColumn Header="Expense Type" x:Name ="cmbExpenseType" Width="120">
<GridViewColumn.CellTemplate>
<DataTemplate>
<ComboBox ItemsSource="{Binding Path=IC_NAME }" Width="120" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
以上是详细列出视图的WPF。填充后面的代码是:
Private Sub SetupAllocationTab()
'Get list from DB (where there isn't an expense type)
Dim queryExceptions =
From expense In dataEntities.expenses
Where expense.expense_type.ex_type_desc Is Nothing
Order By expense.ex_posted_date
Select
expense.ex_id,
expense.ex_type_id,
expense.override_ex_type_id,
expense.month_id,
expense.account_id,
expense.ex_posted_date,
expense.ex_trans_date,
expense.ex_description,
expense.ex_amount,
expense.ex_deduction,
expense.notes,
expense.ex_file_desc,
expense.insert_datetime,
expense.insert_user,
expense.insert_process,
expense.update_datetime,
expense.update_user,
expense.update_process
'For each item, make an expense object and add it to the ListView
For Each item In queryExceptions.ToList
Dim exp = New expense(item.ex_id, item.ex_type_id, item.override_ex_type_id, item.month_id, item.account_id, item.ex_posted_date, item.ex_trans_date, item.ex_description, item.ex_amount,
item.ex_deduction, item.notes, item.ex_file_desc, item.insert_datetime, item.insert_user, item.insert_process, item.update_datetime, item.update_user, item.update_process)
lvAllocation.Items.Add(exp)
Next
'Create list for expense dropdown
ExceptionTypeDropdown()
End Sub
运行从我的数据库中获取的edmx数据模型。
我的问题是,如何使用表expense_type中存在的dat填充ComboBox列。这就是我尝试过一些我在网上找到的东西。任何帮助深表感谢。
Private Sub ExceptionTypeDropdown()
Dim expenseTypes =
From expense_type In dataEntities.expense_type
Select expense_type.ex_type_code,
expense_type.ex_type_desc
'Add the expense type combo box on the DataGrid
End Sub
答案 0 :(得分:0)
请注意我的代码比VB.Net更多C#,但我想你可以翻译这部分。
因此,您需要的是一个独立的物品来源,其中包含所有可能的费用类型以及绑定到您的收藏中的选定值:
在控件/窗口的XAML资源中:
<CollectionViewSource x:Key="expenseTypesSource"/>
在初始化代码中:
var expenseTypesSource = Resources["expenseTypesSource"] as CollectionViewSource;
expenseTypesSource.Source = expenseTypes; // each item as { ex_type_code, ex_type_desc }
组合框用法:
<ComboBox
ItemsSource="{Binding Source={StaticResource expenseTypesSource}}"
DisplayMemberPath="ex_type_desc"
SelectedValuePath="ex_type_code"
SelectedValue="{Binding ex_type_id}"
Width="120" />
正确使用DataContext
后,您可以跳过部分代码,但我不会在此处详细介绍。