我正在尝试运行 Devexpress Dxgrid 示例程序。这是这里
垂直网格代码是：
using DevExpress.Data;
using DevExpress.Xpf.Editors.Settings;
using DevExpress.Xpf.Grid;
using System;
using System.Collections;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Linq;
using System.Reflection;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
namespace dxExample.VGrid
{
public partial class VerticalGridControl : GridControl
{
INotifyCollectionChanged backItemsSourceEvents;
object InternalItemsSource
{
get { return base.ItemsSource; }
set { base.ItemsSource = value; }
}
GridColumnCollection InternalColumns
{
get { return base.Columns; }
}
public VerticalRowCollection Rows { get; set; }
public bool AutoPopulateRows
{
get { return (bool)GetValue(AutoPopulateRowsProperty); }
set { SetValue(AutoPopulateRowsProperty, value); }
}
public new object ItemsSource
{
get { return (object)GetValue(ItemsSourceProperty); }
set { SetValue(ItemsSourceProperty, value); }
}
public VerticalGridControl()
{
InitializeComponent();
InitializeRowsCollection();
SubscribeItemsSourcePropertyChanged();
}
void InitializeRowsCollection()
{
Rows = new VerticalRowCollection();
Rows.CollectionChanged += OnRowsCollectionChanged;
}
void UpdateRowsCollection()
{
if (AutoPopulateRows)
{
PopulateRows();
}
}
void SubscribeItemsSourcePropertyChanged()
{
DependencyPropertyDescriptor itemsSourceDropertyDescriptor = DependencyPropertyDescriptor.FromProperty(VerticalGridControl.ItemsSourceProperty, typeof(VerticalGridControl));
itemsSourceDropertyDescriptor.AddValueChanged(this, new EventHandler(OnItemsSourcePropertyChanged));
}
void UpdateInternalColumns()
{
ICollection itemsSource = (ItemsSource as ICollection);
if (itemsSource == null)
{
Columns.Clear();
return;
}
Columns.BeginUpdate();
int columnsCount = itemsSource.Count;
if (InternalColumns.Count == columnsCount) return;
int delta = columnsCount - InternalColumns.Count;
if (columnsCount > InternalColumns.Count)
{
for (int i = InternalColumns.Count; i < columnsCount; i++)
{
InternalColumns.Add(new GridColumn() { FieldName = i.ToString(), UnboundType = UnboundColumnType.Object });
}
}
else
{
for (int i = InternalColumns.Count - 1; i >= columnsCount; i--)
{
InternalColumns.RemoveAt(i);
}
}
Columns.EndUpdate();
}
void UpdateItemsSourceEventsSubscription()
{
if (backItemsSourceEvents != null)
{
backItemsSourceEvents.CollectionChanged -= OnItemsSourceCollectionChanged;
}
if (!(ItemsSource is INotifyCollectionChanged)) return;
INotifyCollectionChanged itemsSourceEvents = (ItemsSource as INotifyCollectionChanged);
itemsSourceEvents.CollectionChanged += OnItemsSourceCollectionChanged;
backItemsSourceEvents = itemsSourceEvents;
}
void PopulateRows()
{
IEnumerable itemsSource = (ItemsSource as IEnumerable);
if (itemsSource == null) return;
IEnumerator itemsSourceEnumerator = itemsSource.GetEnumerator();
itemsSourceEnumerator.MoveNext();
object item = itemsSourceEnumerator.Current;
if (item == null) return;
PropertyInfo[] itemProps = item.GetType().GetProperties();
for (int i = 0; i < itemProps.Length; i++)
{
Rows.Add(VerticalRowData.FromPropertyInfo(itemProps[i]));
}
}
void OnRowsCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
InternalItemsSource = Rows;
}
void OnItemsSourcePropertyChanged(object sender, EventArgs e)
{
UpdateInternalColumns();
UpdateRowsCollection();
UpdateItemsSourceEventsSubscription();
}
void OnItemsSourceCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Add || e.Action == NotifyCollectionChangedAction.Remove)
{
UpdateInternalColumns();
}
}
void OnProcessUnboundColumnData(object sender, GridColumnDataEventArgs e)
{
IList itemsSource = (ItemsSource as IList);
if (itemsSource == null) return;
VerticalRowData row = Rows[e.ListSourceRowIndex];
object item = itemsSource[Convert.ToInt32(e.Column.FieldName)];
PropertyInfo itemProperty = item.GetType().GetProperty(row.RowName);
if (itemProperty == null) return;
if (e.IsGetData)
{
e.Value = itemProperty.GetValue(item);
}
if (e.IsSetData)
{
itemProperty.SetValue(item, e.Value);
}
}
public static readonly DependencyProperty AutoPopulateRowsProperty = DependencyProperty.Register("AutoPopulateRows", typeof(bool), typeof(VerticalGridControl), new PropertyMetadata(false));
public static new readonly DependencyProperty ItemsSourceProperty = DependencyProperty.Register("ItemsSource", typeof(object), typeof(VerticalGridControl), new PropertyMetadata(null));
}
public class BottomIndicatorRowVisibilityConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (values.Count() < 2)
return Visibility.Collapsed;
if (!((values[0] is int) && (values[1] is int)))
return Visibility.Collapsed;
return ((int)values[0]) > ((int)values[1]) ? Visibility.Visible : Visibility.Collapsed;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
public class DefaultCellTemplateSelector : DataTemplateSelector
{
public override DataTemplate SelectTemplate(object item, DependencyObject container)
{
VerticalRowData row = ((item as EditGridCellData).RowData.Row as VerticalRowData);
if (row.CellTemplate == null) return base.SelectTemplate(item, container);
return row.CellTemplate;
}
}
public class VerticalRowData : DependencyObject
{
public string RowName { get; set; }
public DataTemplate CellTemplate
{
get { return (DataTemplate)GetValue(CellTemplateProperty); }
set { SetValue(CellTemplateProperty, value); }
}
public static readonly DependencyProperty CellTemplateProperty = DependencyProperty.Register("CellTemplate", typeof(DataTemplate), typeof(VerticalRowData), new PropertyMetadata(null));
public static VerticalRowData FromPropertyInfo(PropertyInfo info)
{
return new VerticalRowData() { RowName = info.Name };
}
}
public class VerticalRowCollection : ObservableCollection<VerticalRowData>
{
protected override void InsertItem(int index, VerticalRowData item)
{
int existsIndex = IndexOf(item.RowName);
if (existsIndex > -1)
{
if (Items[existsIndex].CellTemplate != null) return;
Items[existsIndex].CellTemplate = item.CellTemplate;
return;
}
base.InsertItem(index, item);
}
int IndexOf(string rowName)
{
for (int i = 0; i < Items.Count; i++)
{
if (Items[i].RowName == rowName) return i;
}
return -1;
}
}
}
我正在使用 Visual Studio 2010 和 .NET 4.0，并且我在 OnProcessunboundData 函数的“GetValue”和“SetValue”方法中遇到的唯一错误，告诉没有重载运算符分别采用“1”和“2”运算符。
是否是平台不匹配的原因。请尝试下载上述示例代码并告诉我答案。
谢谢，维维克