在"WPF分页DataGrid"中介绍了如何实现分页功能,本文中介绍如果实现右键菜单。见下图:
点击菜单项Age,将Age列隐藏,再点击则显示;并实现移动列后,同步显示。
要实现功能需要在Loaded事件时给列添加右键菜单。
public class PagingDataGrid : DataGrid {
……
void PagingDataGrid_Loaded(object sender, RoutedEventArgs e) {
RaisePageChanged();
//设置列的右键菜单
SetColumnContextMenu();
}
void SetColumnContextMenu() {
}
}
见SetColumnContextMenu方法:
先枚举所有的列,然后创建相同的菜单项,将列是否显示绑定到菜单项是否选中上,这里需要用代码Binding,右键事件中判断是否为DataGridColumnHeader,是则显示右键菜单。ColumnReordering和ColumnReordeed则是移动列的事件,不要也行,但是菜单项顺序和实际移动后的顺序不同。
void SetColumnContextMenu() {
ContextMenu cm = new ContextMenu();
Visibility2BooleanConverter converter = new Visibility2BooleanConverter();
foreach (DataGridColumn col in this.Columns) {
MenuItem mi = new MenuItem { Header = col.Header };
Binding isCheckedBinding = new Binding {
Path=new PropertyPath("Visibility"),
Source=col,
Mode=BindingMode.TwoWay,
Converter=converter,
};
mi.SetBinding(MenuItem.IsCheckedProperty, isCheckedBinding);
mi.Click += (s, e) => {
mi.IsChecked = !mi.IsChecked;
};
cm.Items.Add(mi);
}
//右键列名,触发右键菜单显示
this.MouseRightButtonDown += (s, e) => {
DependencyObject obj = e.OriginalSource as DependencyObject;
while (obj != null && !(obj is DataGridColumnHeader)) {
obj = VisualTreeHelper.GetParent(obj);
}
if (obj != null && obj is DataGridColumnHeader) {
((DataGridColumnHeader)obj).ContextMenu = cm;
}
};
int startColumnIndex = 0, endColumnIndex = 0;
object tmpMenuItem=null;
this.ColumnReordering += (s, e) => {
startColumnIndex = e.Column.DisplayIndex;
tmpMenuItem = cm.Items[startColumnIndex];
cm.Items.RemoveAt(startColumnIndex);
};
this.ColumnReordered += (s, e) => {
endColumnIndex = e.Column.DisplayIndex;
cm.Items.Insert(endColumnIndex, tmpMenuItem);
};
}
其中,需要自己建立一个Converter类,作用是将Visibility转换为bool类型
/// <summary>
/// Visibility to Boolean的转换类
/// </summary>
public class Visibility2BooleanConverter:IValueConverter {
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
return (Visibility)value == Visibility.Visible;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
return (bool)value ? Visibility.Visible : Visibility.Collapsed;
}
}
代码:http://download.csdn.net/detail/qing2005/4385971