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published in(发表于) 2014/1/30 1:26:37 |
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DataGridView控件和List绑定问题-怎么排序_[Asp.Net教程]
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DataGridView控件和List绑定问题-怎么排序_[Asp.Net教程]
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DataGridView控件和List绑定问题:怎么排序_[Asp.Net教程] 以前不都是用table直接绑定DataGridView的,没有出现过不能排序的问题,初试List结果发现不管怎么样都不能实现排序的功能,有朋友说 DataGridView每一列都有个Sortable,默认Automatic,改成NotSortable了,结果怎样,还是不行啦。 还有朋友说, 你可以拖一个bindingsource控件. bindingsource.datasource=泛型集合 datagridview.datasource=bindingsource; 我发现也是不行,那要怎么办呢?查一下资料才知道 用泛型会失去DateTable的特性,要实现System.Collections.Generic.IComparer 才能实现排序
没有办法只能实现 一把了
看一下下面的代码吧, 基本 是这样的
代码 using System; using System.ComponentModel; using System.Collections.Generic; using System.Reflection;
namespace BaseFunction { class ObjectPropertyCompare : System.Collections.Generic.IComparer { private PropertyDescriptor property; private ListSortDirection direction;
public ObjectPropertyCompare(PropertyDescriptor property, ListSortDirection direction) { this.property = property; this.direction = direction; }
#region IComparer
/// /// 比较方法 /// /// 相对属性x /// 相对属性y /// 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.Equals(yValue)) { returnValue = 0; } else { returnValue = xValue.ToString().CompareTo(yValue.ToString()); }
if (direction == ListSortDirection.Ascending) { return returnValue; } else { return returnValue * -1; } }
public bool Equals(T xWord, T yWord) { return xWord.Equals(yWord); }
public int GetHashCode(T obj) { return obj.GetHashCode(); }
#endregion } }
在实现了这个接口之后还不能急,我们还要来写一个SortableBindingList :BindingList 的类用来绑定数据
基本实现
代码 using System; using System.ComponentModel; using System.Collections.Generic; using System.IO; using System.Runtime.Serialization.Formatters.Binary; using System.Text;
namespace BaseFunction { public class BindingCollection : BindingList { private bool isSorted; private PropertyDescriptor sortProperty; private ListSortDirection sortDirection;
protected override bool IsSortedCore { get { return isSorted; } }
protected override bool SupportsSortingCore { get { return true; } }
protected override ListSortDirection SortDirectionCore { get { return sortDirection; } }
protected override PropertyDescriptor SortPropertyCore { get { return sortProperty; } }
protected override bool SupportsSearchingCore { get { return true; } }
protected override void ApplySortCore(PropertyDescriptor property, ListSortDirection direction) { List items = this.Items as List;
if (items != null) { ObjectPropertyCompare pc = new ObjectPropertyCompare(property, direction); items.Sort(pc); isSorted = true; } else { isSorted = false; }
sortProperty = property; sortDirection = direction;
this.OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1)); }
protected override void RemoveSortCore() { isSorted = false; this.OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1)); } //排序 public void Sort(PropertyDescriptor property, ListSortDirection direction) { this.ApplySortCore(property, direction); } } }
现 在应该流到怎么使用了,其实很简单
直接
BindingCollection
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