れいじと申します。
VS2013,C# WPFで開発しております。
下記のコードの場合に、初期化時（ウィンドウ表示時）にDataGridのカラムを手動設定したいのですが、
どのタイミング？イベントで実施すればいいかがわかりません。ご教示いただけないでしょうか。
XAML
<Window x:Class="TabGridTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow"
Width="525"
Height="350"
ContentRendered="MainWindow_OnContentRendered"
Loaded="MainWindow_OnLoaded">
<Grid x:Name="layoutRoot">
<TabControl x:Name="testTabControl"
ItemsSource="{Binding Path=TestTabItems}"
SelectionChanged="TestTabControl_OnSelectionChanged">
<TabControl.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding Path=TabName}" />
</StackPanel>
</DataTemplate>
</TabControl.ItemTemplate>
<TabControl.ContentTemplate>
<DataTemplate>
<DataGrid x:Name="testDataGrid"
AutoGenerateColumns="False"
ItemsSource="{Binding Path=StoreItems}" />
</DataTemplate>
</TabControl.ContentTemplate>
</TabControl>
</Grid>
</Window>
CS
using System;
using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Media;
namespace TabGridTest
{
public partial class MainWindow : Window
{
private MainWindowViewModel mainWindowViewModel { get; set; }
public MainWindow()
{
InitializeComponent();
this.mainWindowViewModel = new MainWindowViewModel();
this.DataContext = this.mainWindowViewModel;
}
private void MainWindow_OnContentRendered(object sender, EventArgs e)
{
this.testTabControl.SelectedIndex = 0;
// FindVisualChildByNameでNullが返ってしまう
this.InitializeTestDataGrid();
}
private void MainWindow_OnLoaded(object sender, RoutedEventArgs e)
{
// FindVisualChildByNameでNullが返ってしまう
this.InitializeTestDataGrid();
}
private void TestTabControl_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
// ここではFindVisualChildByNameでDataGridが取得できるのでカラムの設定が可能
this.InitializeTestDataGrid();
}
private void InitializeTestDataGrid()
{
DataGrid dataGrid = this.FindVisualChildByName<DataGrid>(this.testTabControl, "testDataGrid");
if (dataGrid == null)
return;
TestTabItem testTabItem = this.testTabControl.SelectedItem as TestTabItem;
if (testTabItem == null)
return;
// カラム削除
dataGrid.Columns.Clear();
// 各タブごとに表示するカラムや順序が違うため
foreach (var dispColumn in testTabItem.DispColumns)
{
dataGrid.Columns.Add(new DataGridTextColumn()
{
Header = dispColumn.Name,
Binding = new Binding(dispColumn.Key)
});
}
}
// 指定された名前のコントロールを返す
private T FindVisualChildByName<T>(DependencyObject parent, string name) where T : FrameworkElement
{
T child = default(T);
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
{
var ch = VisualTreeHelper.GetChild(parent, i);
child = ch as T;
if (child != null && child.Name == name)
break;
else
child = FindVisualChildByName<T>(ch, name);
if (child != null) break;
}
return child;
}
}
public class MainWindowViewModel
{
// タブ一覧
public ObservableCollection<TestTabItem> TestTabItems { get; set; }
public MainWindowViewModel()
{
this.TestTabItems = new ObservableCollection<TestTabItem>
{
new TestTabItem
{
TabId = 1,
TabName = "Tab1",
StoreItems = new ObservableCollection<StoreItem>
{
new StoreItem
{
Id = 1,
Name = "お店1",
Category = "中華",
ZipCode = "001",
Address = "東京",
},
new StoreItem
{
Id = 2,
Name = "お店2",
Category = "フレンチ",
ZipCode = "002",
Address = "札幌",
},
new StoreItem
{
Id = 3,
Name = "お店3",
Category = "イタリアン",
ZipCode = "003",
Address = "大阪",
},
},
DispColumns = new ObservableCollection<DispColumn>
{
new DispColumn
{
Key = "Name",
Name = "店名"
},
new DispColumn
{
Key = "Address",
Name = "住所"
}
}
},
new TestTabItem
{
TabId = 2,
TabName = "Tab2",
StoreItems = new ObservableCollection<StoreItem>
{
new StoreItem
{
Id = 1,
Name = "居酒屋タロウ",
Category = "居酒屋",
ZipCode = "001",
Address = "東京",
},
new StoreItem
{
Id = 2,
Name = "居酒屋ジロウ",
Category = "居酒屋",
ZipCode = "002",
Address = "札幌",
},
new StoreItem
{
Id = 3,
Name = "居酒屋サブロウ",
Category = "居酒屋",
ZipCode = "003",
Address = "大阪",
},
},
DispColumns = new ObservableCollection<DispColumn>
{
new DispColumn
{
Key = "Category",
Name = "分類"
},
new DispColumn
{
Key = "Address",
Name = "住所"
},
new DispColumn
{
Key = "Name",
Name = "店名"
},
}
}
};
}
}
// タブ用データ
public class TestTabItem
{
public int TabId { get; set; }
public string TabName { get; set; }
// タブ内のグリッド表示用データ
public ObservableCollection<StoreItem> StoreItems { get; set; }
// グリッドに表示するカラムデータ
public ObservableCollection<DispColumn> DispColumns { get; set; }
}
// 表示用データ
public class StoreItem
{
public int Id { get; set; }
public string Name { get; set; }
public string Category { get; set; }
public string ZipCode { get; set; }
public string Address { get; set; }
}
// 表示カラム
public class DispColumn
{
public string Key { get; set; }
public string Name { get; set; }
}
}
