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);
/// 代码里写return new interface.common.dropdowntree(this);
dropdowntree dropdowntree
{
get;
}
}
public sealed class dropdowntree
idropdowntree _dropdowntree;
public dropdowntree(idropdowntree dropdowntree)
_dropdowntree = dropdowntree;
/// 用于树的前缀
/// <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 += "┬";
result += "─";
return result;
#region 绑定下拉菜单
/// 绑定连动级的下拉菜单
/// <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);
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();
public void bindtodropdownlist(dropdownlist ddlgoodstype)
bindtodropdownlist(ddlgoodstype, string.empty,null, true);
/// <param name="removeid">被排除的id</param>
public void bindtodropdownlist(dropdownlist ddlgoodstype, string removeid)
bindtodropdownlist(ddlgoodstype, removeid,null, true);
/// <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); }
页面调用代码: 类名.dropdowntree.bindtodropdownlist(下拉控件id);
希望对大伙有点帮助....