/// <summary>
/// 自定义绑定列表类
/// </summary>
/// <typeparam name="T">列表对象类型</typeparam>
public class BindingCollection<T> : BindingList<T>
{
private bool isSorted;
private PropertyDescriptor sortProperty;
private ListSortDirection sortDirection;
/// <summary>
/// 构造函数
/// </summary>
public BindingCollection() : base()
{
}
/// <summary>
/// 构造函数
/// </summary>
/// <param name="list">IList类型的列表对象</param>
public BindingCollection(IList<T> list) : base(list)
{
}
/// <summary>
/// 自定义排序操作
/// </summary>
/// <param name="property"></param>
/// <param name="direction"></param>
protected override void ApplySortCore(PropertyDescriptor property, ListSortDirection direction)
{
List<T> items = this.Items as List<T>;
if (items != null)
{
ObjectPropertyCompare<T> pc = new ObjectPropertyCompare<T>(property, direction);
items.Sort(pc);
isSorted = true;
}
else
{
isSorted = false;
}
sortProperty = property;
sortDirection = direction;
this.OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
}
/// <summary>
/// 获取一个值，指示列表是否已排序
/// </summary>
protected override bool IsSortedCore
{
get
{
return isSorted;
}
}
/// <summary>
/// 获取一个值，指示列表是否支持排序
/// </summary>
protected override bool SupportsSortingCore
{
get
{
return true;
}
}
/// <summary>
/// 获取一个只，指定类别排序方向
/// </summary>
protected override ListSortDirection SortDirectionCore
{
get
{
return sortDirection;
}
}
/// <summary>
/// 获取排序属性说明符
/// </summary>
protected override PropertyDescriptor SortPropertyCore
{
get
{
return sortProperty;
}
}
/// <summary>
/// 移除默认实现的排序
/// </summary>
protected override void RemoveSortCore()
{
isSorted = false;
this.OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
}
}
public class ObjectPropertyCompare<T> : IComparer<T>
{
private PropertyDescriptor property;
private ListSortDirection direction;
// 构造函数
public ObjectPropertyCompare(PropertyDescriptor property, ListSortDirection direction)
{
this.property = property;
this.direction = direction;
}
// 实现IComparer中方法
public int Compare(T x, T y)
{
object xValue = x.GetType().GetProperty(property.Name).GetValue(x, null);
object yValue = y.GetType().GetProperty(property.Name).GetValue(y, null);
int returnValue;
if (xValue is IComparable)
{
returnValue = ((IComparable)xValue).CompareTo(yValue);
}
else if (xValue == yValue)
{
returnValue = 0;
}
else
{
returnValue = xValue.ObjToString().CompareTo(yValue.ObjToString());
}
if (direction == ListSortDirection.Ascending)
{
return returnValue;
}
else
{
return returnValue * -1;
}
}
}
new BindingCollection<model对象>(models);