看到同事有一個這樣的需求，自己就寫了一個小例子
如何根據DataGrid中Combox中選擇的值將對應的數據顯示到DataGrid中
創建了 三個數據源
List<int> SelectionList爲 Combox 數據源存放於所有數據相相關聯的字段值(Selection)，
tb爲 DataGrid數據源存放的是與Combox相關聯的數據 (Age,Name,Selection)，
oldtable 用於存放所有數據(Age,Name,Selection)
前臺代碼：
<Window x:Class="MyTestWPF.DataGridCombox"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="DataGridCombox" Height="276" Width="633" Loaded="Window_Loaded">
<Grid>
<DataGrid AutoGenerateColumns="False" ItemsSource="{Binding}" CanUserAddRows="False" Name="dg_Grid" AreRowDetailsFrozen="False" AllowDrop="True" Margin="23,0,23,32">
<DataGrid.Columns>
<!--依賴屬性綁定數據源下拉框必須同時指定EditingElementStyle、ElemengStyle才能顯示下拉框中的數據-->
<DataGridComboBoxColumn Header="ComboBox模式（修正）">
<DataGridComboBoxColumn.EditingElementStyle>
<Style TargetType="ComboBox">
<Setter Property="ItemsSource" Value="{Binding Path=SelectionList,RelativeSource={RelativeSource AncestorType={x:Type Window},Mode=FindAncestor}}" />
<Setter Property="SelectedValue" Value="{Binding Path=Value}" />
<Setter Property="Text" Value="{Binding Selection}"/>
</Style>
</DataGridComboBoxColumn.EditingElementStyle>
<DataGridComboBoxColumn.ElementStyle>
<Style TargetType="ComboBox">
<Setter Property="ItemsSource" Value="{Binding Path=SelectionList,RelativeSource={RelativeSource AncestorType={x:Type Window},Mode=FindAncestor}}" />
<Setter Property="SelectedValue" Value="{Binding Path=Value}" />
</Style>
</DataGridComboBoxColumn.ElementStyle>
</DataGridComboBoxColumn>
<!--不使用依賴屬性綁定下拉框時,數據源中必須包含該屬性字段-->
<DataGridTemplateColumn Header="Template模式" x:Uid="Moshi">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox Tag="cbxList" x:Name="cbxList" DropDownClosed="cbxList_DropDownClosed"
ItemsSource="{Binding Path=SelectionList,RelativeSource={RelativeSource AncestorType={x:Type Window},Mode=FindAncestor}}"
Text="{Binding Selection}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="姓 名" Width="100">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding Name}"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="年 齡">
<DataGridTemplateColumn.CellTemplate >
<DataTemplate >
<TextBox Text="{Binding Age}"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
<ComboBox Height="23" HorizontalAlignment="Left" Margin="186,211,0,0" Name="comboBox1" VerticalAlignment="Top" Width="120" />
</Grid>
</Window>
後臺代碼：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Data;
using System.Collections;
using System.Collections.ObjectModel;
namespace MyTestWPF
{
/// <summary>
/// DataGridCombox.xaml 的交互邏輯
/// </summary>
public partial class DataGridCombox : Window
{
DataTable tb;
DataTable newtb;
/// <summary>
/// 下拉框數據源
/// </summary>
public List<int> SelectionList
{
get { return _selectionList; }
set { _selectionList = value; }
}
private List<int> _selectionList = new List<int>();
public DataGridCombox()
{
InitializeComponent();
tb = new DataTable();
DataColumn Name = new DataColumn("Name");
DataColumn Age = new DataColumn("Age");
DataColumn Selection = new DataColumn("Selection");
tb.Columns.Add(Name);
tb.Columns.Add(Age);
tb.Columns.Add(Selection);
newtb = tb.Copy();
newtb.Clear();
banging();
check("1");
//if (SelectionList.Count > 0)
//{
// DataGridTemplateColumn templeColumn = dg_Grid.Columns[1] as DataGridTemplateColumn;
// if (templeColumn == null) return;
// object item = dg_Grid.CurrentCell.Item;
// FrameworkElement element = templeColumn.GetCellContent(dg_Grid.Items[0]);
// ComboBox expander = templeColumn.CellTemplate.FindName("cbxList", element) as ComboBox;
// expander.IsEnabled = false;
//}
}
private void banging()
{
//如果綁定數據不採用依賴屬性綁定 採用數據模板添加 Combox 則該下拉框的數據源爲Selection
for (int i = 0; i < 5; i++)
{
DataRow row = tb.NewRow();
row["Name"] = "AA" + i.ToString();
row["Age"] = i.ToString();
row["Selection"] = i.ToString();
SelectionList.Add(i);
DataRow rw = newtb.NewRow();
rw["Name"] = "AA" + i.ToString();
rw["Age"] = i.ToString();
rw["Selection"] = i.ToString();
tb.Rows.Add(row);
newtb.Rows.Add(rw);
}
//如果數據源綁定要用DataContent上下文數據綁定，則xmal界面必須指定ItemSource="{Binding}"
}
private void check(string str)
{
newtb.Clear();
DataRow[] row = tb.Select("Selection='" + str + "'");
if (row.Length > 0)
{
DataRow nrow = newtb.NewRow();
nrow["Name"] = row[0]["Name"].ToString();
nrow["Age"] = row[0]["Age"].ToString();
nrow["Selection"] = row[0]["Selection"].ToString();
newtb.Rows.Add(nrow);
dg_Grid.DataContext = newtb;
}
}
private void cbxList_DropDownClosed(object sender, EventArgs e)
{
ComboBox cbx = sender as ComboBox;
if (cbx != null)
{
if (cbx.SelectedItem != null)
{
check(cbx.SelectedItem.ToString());
}
}
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
if (SelectionList.Count > 1)
{
//dg_Grid.IsEnabled = false;
// DataGridTemplateColumn templeColumn = dg_Grid.Columns[1] as DataGridTemplateColumn;
// if (templeColumn == null) return;
// object item = dg_Grid.CurrentCell.Item;
// FrameworkElement element = templeColumn.GetCellContent(dg_Grid.Items[0]);
// ComboBox expander = templeColumn.CellTemplate.FindName("cbxList", element) as ComboBox;
// expander.IsEnabled = true;
// expander.IsEditable = false;
// expander.IsReadOnly = true;
// comboBox1.IsEnabled = false;
}
}
private void cbxList_Initialized(object sender, EventArgs e)
{
if (SelectionList.Count > 0)
{
ComboBox cbx = sender as ComboBox;
cbx.IsEnabled = false;
}
}
}
}
當下來框的數據源是List時可以滿足上述聯動效果，可以當Combox改爲newtb 時Combox中的數據就不顯示了？？？？