上接扩展GridView控件(4) - 联动复选框（复选框的全选和取消全选）

上接>>

 

 

4、新建一个继承自CollectionBase的类CheckboxAlls

using System.Collections;
using System.ComponentModel;
using System.Web.UI;

namespace YYControls.SmartGridView
{
        /// <summary>
        /// CheckboxAlls 的摘要说明。
        /// 注意要继承自CollectionBase
        /// </summary>
        [
        ToolboxItem(false),
        ParseChildren(true)
        ]
        public class CheckboxAlls : CollectionBase
        {
                /// <summary>
                /// 构造函数
                /// </summary>
                public CheckboxAlls()
                        : base()
                {
                }

                /// <summary>
                /// 实现IList接口
                /// 获取或设置指定索引处的元素。
                /// </summary>
                /// <param name="index">要获得或设置的元素从零开始的索引</param>
                /// <returns></returns>
                public CheckboxAll this[int index]
                {
                        get
                        {
                                return (CheckboxAll)base.List[index];
                        }
                        set
                        {
                                base.List[index] = (CheckboxAll)value;
                        }
                }

                /// <summary>
                /// 实现IList接口
                /// 将某项添加到 System.Collections.IList 中。
                /// </summary>
                /// <param name="item">要添加到 System.Collections.IList 的 System.Object。</param>
                public void Add(CheckboxAll item)
                {
                        base.List.Add(item);
                }

                /// <summary>
                /// 实现IList接口
                /// 从 System.Collections.IList 中移除特定对象的第一个匹配项。
                /// </summary>
                /// <param name="index">要从 System.Collections.IList 移除的 System.Object</param>
                public void Remove(int index)
                {
                        if (index > -1 && index < base.Count)
                        {
                                base.List.RemoveAt(index);
                        }
                }
        }
}

 

 

5、在继承自GridView的类中加一个复杂对象属性，该复杂对象就是第4步创建的那个CheckboxAlls

private CheckboxAlls _checkboxAlls;
                /// <summary>
                /// 复选框组集合 一个组由一个 全选复选框 和多个 项复选框组成
                /// </summary>
                [
                PersistenceMode(PersistenceMode.InnerProperty),
                DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
                Description("复选框组集合 一个组由一个 全选复选框 和多个 项复选框组成"),
                Category("扩展")
                ]
                public virtual CheckboxAlls CheckboxAlls
                {
                        get
                        {
                                if (_checkboxAlls == null)
                                {
                                        _checkboxAlls = new CheckboxAlls();
                                }
                                return _checkboxAlls;
                        }
                }

 

6、声明一些内部属性

/// <summary>
                /// 隐藏字段的ID，用于存每组的全选复选框ID
                /// </summary>
                protected string HiddenCheckboxAllID
                {
                        get { return "hdn_checkboxAll"; }
                }
                /// <summary>
                /// 隐藏字段的ID，用于存每组的项复选框ID
                /// </summary>
                protected string HiddenCheckboxItemID
                {
                        get { return "hdn_checkboxItem"; }
                }

                /// <summary>
                /// 组分隔符，一个 全选复选框 和其对应的n个 项复选框 为一个组
                /// </summary>
                protected char GroupSeparator
                {
                        get { return ','; }
                }
                /// <summary>
                /// 项分隔符，项复选框 每个项之间的分隔符
                /// </summary>
                protected char ItemSeparator
                {
                        get { return '|'; }
                }

 

 

 

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