• datagridview 点击列标题排序


    datagridview 点击列标题排序

    装载:作者:大亨梦 出处:http://www.cnblogs.com/fer-team/ 程序员知识库:http://www.5uzh.com 本文版权归作者和博客园共有,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文连接,否则保留追究法律责任的权利。

    开发winform中,平时经常用到数据列表,我们大多选用datagridview,但是此控件本身没有排序的功能。参阅网上资料。留下标记,以后备用。

    datagridview的数据显示一般是通过数据绑定来实现,

     即:this.datagridview.DataSource=this.bindingSrc;

          this.bindingSrc.DataSource=this.Model;

    这种形式就完成了,数据的显示过程。但是要实现点击datagridview实现排序的功能,需要实现对数据源排序的功能。具体代码如下:

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    public class SortableBindingList<T> : BindingList<T>
        {
            private bool isSortedCore = true;
            private ListSortDirection sortDirectionCore = ListSortDirection.Ascending;
            private PropertyDescriptor sortPropertyCore = null;
            private string defaultSortItem;
     
            public SortableBindingList() : base() { }
     
            public SortableBindingList(IList<T> list) : base(list) { }
     
            protected override bool SupportsSortingCore
            {
                get { return true; }
            }
     
            protected override bool SupportsSearchingCore
            {
                get { return true; }
            }
     
            protected override bool IsSortedCore
            {
                get { return isSortedCore; }
            }
     
            protected override ListSortDirection SortDirectionCore
            {
                get { return sortDirectionCore; }
            }
     
            protected override PropertyDescriptor SortPropertyCore
            {
                get { return sortPropertyCore; }
            }
     
            protected override int FindCore(PropertyDescriptor prop, object key)
            {
                for (int i = 0; i < this.Count; i++)
                {
                    if (Equals(prop.GetValue(this[i]), key)) return i;
                }
                return -1;
            }
     
            protected override void ApplySortCore(PropertyDescriptor prop, ListSortDirection direction)
            {
                isSortedCore = true;
                sortPropertyCore = prop;
                sortDirectionCore = direction;
                Sort();
            }
     
            protected override void RemoveSortCore()
            {
                if (isSortedCore)
                {
                    isSortedCore = false;
                    sortPropertyCore = null;
                    sortDirectionCore = ListSortDirection.Ascending;
                    Sort();
                }
            }
     
            public string DefaultSortItem
            {
                get { return defaultSortItem; }
                set
                {
                    if (defaultSortItem != value)
                    {
                        defaultSortItem = value;
                        Sort();
                    }
                }
            }
     
            private void Sort()
            {
                List<T> list = (this.Items as List<T>);
                list.Sort(CompareCore);
                ResetBindings();
            }
     
            private int CompareCore(T o1, T o2)
            {
                int ret = 0;
                if (SortPropertyCore != null)
                {
                    ret = CompareValue(SortPropertyCore.GetValue(o1), SortPropertyCore.GetValue(o2), SortPropertyCore.PropertyType);
                }
                if (ret == 0 && DefaultSortItem != null)
                {
                    PropertyInfo property = typeof(T).GetProperty(DefaultSortItem, BindingFlags.Public | BindingFlags.GetProperty | BindingFlags.Instance | BindingFlags.IgnoreCase, null, null, new Type[0], null);
                    if (property != null)
                    {
                        ret = CompareValue(property.GetValue(o1, null), property.GetValue(o2, null), property.PropertyType);
                    }
                }
                if (SortDirectionCore == ListSortDirection.Descending) ret = -ret;
                return ret;
            }
     
            private static int CompareValue(object o1, object o2, Type type)
            {
     
                if (o1 == null) return o2 == null ? 0 : -1;
                else if (o2 == null) return 1;
                else if (type.IsPrimitive || type.IsEnum) return Convert.ToDouble(o1).CompareTo(Convert.ToDouble(o2));
                else if (type == typeof(DateTime)) return Convert.ToDateTime(o1).CompareTo(o2);
                else return String.Compare(o1.ToString().Trim(), o2.ToString().Trim());
            }
        }

     实现此类后,就可以通过 this.bindingSrc.DataSource=new SortableBindingList<CnsDetailReport>(this.Model); 直接在给datagridview数据源绑定值时加上即可,无需其他设置 。

    实现点击列标题排序的目的了。

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  • 原文地址:https://www.cnblogs.com/mmnyjq/p/4795101.html
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