好多年没写文章了
这里就分享点自己原创的一点破代码,效果如图下:
本人的提供的代码如下:
using System;using System.Collections.Generic;using System.Text;using System.Web.UI.WebControls;namespace Interface.Common{ public interface IDropDownTree : IDisposable { /// <summary> /// 返回Dictionary里分别对应ID,文本,如果没有子节点返回null /// </summary> /// <param name="parentID">父节点ID</param> /// <returns></returns> Dictionary<string, string> GetChildCategory(string parentID); /// <summary> /// 代码里写return new Interface.Common.DropDownTree(this); /// </summary> DropDownTree DropDownTree { get; } } public sealed class DropDownTree { IDropDownTree _DropDownTree; public DropDownTree(IDropDownTree dropDownTree) { _DropDownTree = dropDownTree; } /// <summary> /// 用于树的前缀 /// </summary> /// <param name="IsLast">是否是同级节点中的最后一个</param> /// <param name="HasChild">本节点是否拥有子节点</param> /// <param name="ParentString">父节点前缀符号</param> /// <returns>本节点的前缀</returns> private string GetPreFix(bool isLast, bool hasChild, string parentString) { string result = string.Empty; if (!string.IsNullOrEmpty(parentString)) { parentString = parentString.Remove(parentString.Length - 1).Replace("├", "│").Replace("└", " "); result += parentString; } if (isLast) { result += "└"; } else { result += "├"; } if (hasChild) { result += "┬"; } else { result += "─"; } return result; } #region 绑定下拉菜单 /// <summary> /// 绑定连动级的下拉菜单 /// </summary> /// <param name="ddlGoodsType">传进一个被绑定的DropDownList</param> /// <param name="removeID">被排除绑定的节点ID</param> /// <param name="AutoDispose">是否自动释放</param> public void BindToDropDownList(DropDownList ddlGoodsType, string removeID,string parentID, bool autoDispose) { if (ddlGoodsType != null) { ListItem listItem = null; string currentID = parentID;//根节点/父ID string currentSign = string.Empty;//当前节点符号; string parrentSign = string.Empty; //父节点符号; bool HasChild = true;//是否有子 Queue<string> parentKeyList = new Queue<string>();//存 有子节点的 节点ID Queue<string> parentSignList = new Queue<string>();//对应节点ID的前缀符号 int itemIndexOf = 0;//父节点所在的位置 while (HasChild) { int lastOneCount = 1;//用于计算在同级别中是否最后一个 Dictionary<string, string> childList = _DropDownTree.GetChildCategory(currentID);// 得到子节点列表 if (childList != null && childList.Count > 0) { if (!string.IsNullOrEmpty(removeID) && childList.ContainsKey(removeID)) { childList.Remove(removeID); } foreach (KeyValuePair<string, string> entry in childList) { if (_DropDownTree.GetChildCategory(entry.Key) != null)//存在子 { currentSign = GetPreFix(lastOneCount == childList.Count, true, parrentSign); listItem = new ListItem(currentSign + entry.Value, entry.Key); parentKeyList.Enqueue(entry.Key);//当前的节点ID parentSignList.Enqueue(currentSign);//当前的节点符号 } else//不存在子 { currentSign = GetPreFix(lastOneCount == childList.Count, false, parrentSign); listItem = new ListItem(currentSign + entry.Value, entry.Key); } if (ddlGoodsType.Items.Count != 0) { itemIndexOf = string.IsNullOrEmpty(currentID) ? itemIndexOf + 1 : ddlGoodsType.Items.IndexOf(ddlGoodsType.Items.FindByValue(currentID)) + lastOneCount; } ddlGoodsType.Items.Insert(itemIndexOf, listItem);//添加子节点 lastOneCount++; } if (parentKeyList.Count > 0)//存在子节点时 { currentID = parentKeyList.Dequeue(); parrentSign = parentSignList.Dequeue(); } else { HasChild = false; } } else { break; } } if (autoDispose) { _DropDownTree.Dispose(); } } } /// <summary> /// 绑定连动级的下拉菜单 /// </summary> /// <param name="ddlGoodsType">传进一个被绑定的DropDownList</param> public void BindToDropDownList(DropDownList ddlGoodsType) { BindToDropDownList(ddlGoodsType, string.Empty,null, true); } /// <summary> /// 绑定连动级的下拉菜单 /// </summary> /// <param name="ddlGoodsType">传进一个被绑定的DropDownList</param> /// <param name="removeID">被排除的ID</param> public void BindToDropDownList(DropDownList ddlGoodsType, string removeID) { BindToDropDownList(ddlGoodsType, removeID,null, true); } /// <summary> /// 绑定连动级的下拉菜单 /// </summary> /// <param name="ddlGoodsType">传进一个被绑定的DropDownList</param> /// <param name="removeID">被排除的ID,若没有,传null</param> /// <param name="parentID">起始父ID</param> public void BindToDropDownList(DropDownList ddlGoodsType, string removeID,string parentID) { BindToDropDownList(ddlGoodsType, removeID,parentID, true); } #endregion }}
调用方法很简单:
1.继承自IDropDownTree接口
2.实现3个接口方法
实现接口代码示例[Dispose方法自己实现],最主要的是自己实现获得子级的方法
#region IDropDownTree 成员 public Dictionary<string, string> GetChildCategory(string parentID) { string where = "ParentID='" + parentID + "'"; if (string.IsNullOrEmpty(parentID)) { where = "ParentID is null or ParentID='" + Guid.Empty + "'"; } List<GoodsCategoryBean> _GoodsCategoryList = SelectList(0, where, string.Empty, false); if (_GoodsCategoryList != null && _GoodsCategoryList.Count > 0) { Dictionary<string, string> categoryList = new Dictionary<string, string>(); for (int i = 0; i < _GoodsCategoryList.Count; i++) { categoryList.Add(_GoodsCategoryList[i].ID.ToString(), _GoodsCategoryList[i].GategoryName); } return categoryList; } return null; } public Interface.Common.DropDownTree DropDownTree { get { return new Interface.Common.DropDownTree(this); } } #endregion
页面调用代码: 类名.DropDownTree.BindToDropDownList(下拉控件ID);
希望对大伙有点帮助....