Winform中DataGridView绑定IList数据源后的排序

首先，实现ICompare接口

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.Equals(yValue)) {
            returnValue = 0;
        } else {
            returnValue = xValue.ToString().CompareTo(yValue.ToString());
        }

        if (direction == ListSortDirection.Ascending) {
            return returnValue;
        } else {
            return returnValue * -1;
        }
    }
}

 

 

然后创建自定义的类，实现IBindingList接口，为方便起见，这里直接继承BindingList类

    /// <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));
        }

 

 

创建BindingCollection后即可直接应用：

原来的方式是：

IList<object> list = new List<object>();

...

dataGridView.DataSource = list;

现在只需更改最后一句为：

dataGridView.DataSource = new BindingCollection<object>(list);

即可