发布一款层次下拉列表控件

在项目中经常遇到树状结构的对象比如产品分类、部门结构、地区……对于这类对象的呈现，一般都使用树控件（比如VS2005自带的TreeView控件）。但是树控件的使用和操作都比较复杂，对于一些比较简单的操作，比如单选其中的一个节点的情况则可用使用下拉列表框来代替。要在DropDownList中展示出树结构的层次，那就必须在每个节点的Text前加入一定的占位符，以实现层次的效果，比如：

由于这种下拉列表控件在项目中经常使用，于是决定写一个通用的服务器控件出来。该控件继承自DropDownList，在使用中只需要为该控件设置用于数据绑定的DataTextField和DataValueField，以及新增的属性ChildProperty（string，对象的Child属性的名字）和DeepChar（string，在表示层次中使用的占位符，默认是“–”），设置了这4个属性后，在后台就只需要将树结构对象的Root节点作为DataSource，然后执行DataBind()即可。

<div style=”border-right: #cccccc 1px solid; padding-right: 5px; border-top: #cccccc 1px solid; padding-left: 4px; font-size: 13px; padding-bottom: 4px; border-left: #cccccc 1px solid; width: 98%; word-break: break-all; padding-top: 4px; border-bottom: #cccccc 1px solid; background-color: #eeeeee”>
<img id=”Code_Closed_Image_104722″ onclick=”code_collapse_toggle(this);” height=”16″ alt=”” src=”/Images/OutliningIndicators/ContractedBlock.gif” width=”11″ align=”top”><img id=”Code_Open_Image_104722″ style=”display: none” onclick=”code_collapse_toggle(this);” height=”16″ alt=”” src=”http://www.jb51.cc/Images/OutliningIndicators/ExpandedBlockStart.gif” width=”11″ align=”top”>控件Code<img alt=”” src=”http://www.jb51.cc/Images/OutliningIndicators/None.gif” align=”top”>usingSystem;<img alt=”” src=”http://www.jb51.cc/Images/OutliningIndicators/None.gif” align=”top”>usingSystem.Collections.Generic;<img alt=”” src=”http://www.jb51.cc/Images/OutliningIndicators/None.gif” align=”top”>usingSystem.Collections;<img alt=”” src=”http://www.jb51.cc/Images/OutliningIndicators/None.gif” align=”top”>usingSystem.ComponentModel;<img alt=”” src=”http://www.jb51.cc/Images/OutliningIndicators/None.gif” align=”top”>usingSystem.Linq;<img alt=”” src=”http://www.jb51.cc/Images/OutliningIndicators/None.gif” align=”top”>usingSystem.Text;<img alt=”” src=”http://www.jb51.cc/Images/OutliningIndicators/None.gif” align=”top”>usingSystem.Web;<img alt=”” src=”http://www.jb51.cc/Images/OutliningIndicators/None.gif” align=”top”>usingSystem.Web.UI;<img alt=”” src=”http://www.jb51.cc/Images/OutliningIndicators/None.gif” align=”top”>usingSystem.Web.UI.WebControls;<img alt=”” src=”http://www.jb51.cc/Images/OutliningIndicators/None.gif” align=”top”><img alt=”” src=”http://www.jb51.cc/Images/OutliningIndicators/None.gif” align=”top”>namespaceServerControls<img id=”Codehighlighter1_240_3766_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”http://www.jb51.cc/Images/OutliningIndicators/ExpandedBlockStart.gif” align=”top”><img id=”Codehighlighter1_240_3766_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedBlock.gif” align=”top”><span id=”Codehighlighter1_240_3766_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>[ToolboxData(”<{0}:DropDownTreeListrunat=server></{0}:DropDownTreeList>”)]<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>publicclassDropDownTreeList:DropDownList<img id=”Codehighlighter1_375_3764_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_375_3764_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_375_3764_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>privateobjectdataSource;<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>privateintdeep=0;<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”><img id=”Codehighlighter1_452_1120_Closed_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><img id=”Codehighlighter1_452_1120_Open_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><span id=”Codehighlighter1_452_1120_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”>—-重写—-#region—-重写—-<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>publicoverrideobjectDataSource<img id=”Codehighlighter1_521_701_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_521_701_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_521_701_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>get<img id=”Codehighlighter1_551_606_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_551_606_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_551_606_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>returnthis.dataSource;<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>set<img id=”Codehighlighter1_635_691_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_635_691_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_635_691_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>this.dataSource=value;<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>publicoverridevoidDataBind()<img id=”Codehighlighter1_750_1101_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_750_1101_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_750_1101_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>if(ChildProperty==null)<img id=”Codehighlighter1_803_878_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_803_878_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_803_878_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>thrownewException(”ChildProperty参数必须设置”);<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>this.Items.Clear();<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>ListItemCollectionitems=ConvertTreeToList(dataSource);<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>foreach(ListItemiteminitems)<img id=”Codehighlighter1_1036_1089_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_1036_1089_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_1036_1089_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>this.Items.Add(item);<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”><img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>#endregion<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”><img id=”Codehighlighter1_1131_2931_Closed_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><img id=”Codehighlighter1_1131_2931_Open_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><span id=”Codehighlighter1_1131_2931_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”>—-私有方法—-#region—-私有方法—-<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>privateListItemCollectionConvertTreeToList(objectroot)<img id=”Codehighlighter1_1226_1427_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_1226_1427_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_1226_1427_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>deep=0;<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>ListItemCollectionlist=newListItemCollection();<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>list.Add(GetListItem(root));<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>ConvertTree(list,root);<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>returnlist;<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img id=”Codehighlighter1_1436_1572_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_1436_1572_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_1436_1572_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”>/**////

<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>///将对象转换为ListItem<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>///

<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>///<paramname=”root”><img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>///<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>privateListItemGetListItem(objectroot)<img id=”Codehighlighter1_1630_1934_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_1630_1934_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_1630_1934_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>ListItemitem=newListItem();<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>item.Text=GetDeepChar()+root.GetType().GetProperty(this.DataTextField).GetValue(root,null).ToString();<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>item.Value=root.GetType().GetProperty(this.DataValueField).GetValue(root,null).ToString();<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>returnitem;<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>privatevoidConvertTree(ListItemCollectionlist,objectroot)<img id=”Codehighlighter1_2014_2589_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_2014_2589_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_2014_2589_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>objectchilds=root.GetType().GetProperty(this.ChildProperty).GetValue(root,null);//获得Child的集合<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>if(childs==null)<img id=”Codehighlighter1_2164_2203_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_2164_2203_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_2164_2203_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>return;<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>if(!(childsisICollection))<img id=”Codehighlighter1_2257_2353_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_2257_2353_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_2257_2353_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>thrownewException(”数据源的”+ChildProperty+”属性必须实现ICollection接口”);<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>deep++;<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>foreach(objectchildin(ICollection)childs)<img id=”Codehighlighter1_2443_2559_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_2443_2559_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_2443_2559_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”><img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>list.Add(GetListItem(child));<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>ConvertTree(list,child);//递归转换下一层节点<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>deep–;<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img id=”Codehighlighter1_2598_2697_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_2598_2697_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_2598_2697_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”>/**////

<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>///根据节点的深度返回节点前的占位字符<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>///

<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>///<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>privatestringGetDeepChar()<img id=”Codehighlighter1_2742_2912_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_2742_2912_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_2742_2912_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>stringstr=””;<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>for(inti=0;i<deep;i++)<img id=”Codehighlighter1_2828_2876_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_2828_2876_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_2828_2876_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>str+=DeepChar;<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>returnstr;<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”><img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>#endregion<img id=”Codehighlighter1_2940_3758_Closed_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><img id=”Codehighlighter1_2940_3758_Open_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><span id=”Codehighlighter1_2940_3758_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”>—-公开的属性—-#region—-公开的属性—-<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>[Description(”表示深度增加的字符”)]<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>publicstringDeepChar<img id=”Codehighlighter1_3036_3359_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_3036_3359_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_3036_3359_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>get<img id=”Codehighlighter1_3066_3298_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_3066_3298_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_3066_3298_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>if(ViewState[”DeepChar”]==null||ViewState[”DeepChar”].ToString()==””)<img id=”Codehighlighter1_3175_3227_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_3175_3227_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_3175_3227_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>return”–”;<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>returnViewState[”DeepChar”].ToString();<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img id=”Codehighlighter1_3315_3349_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_3315_3349_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”>set<span id=”Codehighlighter1_3315_3349_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{ViewState[”DeepChar”]=value;}<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>[Description(”对象的子节点集合属性名”)]<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>publicstringChildProperty<img id=”Codehighlighter1_3441_3739_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_3441_3739_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_3441_3739_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>get<img id=”Codehighlighter1_3471_3673_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_3471_3673_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_3471_3673_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>if(ViewState[”ChildProperty”]==null)<img id=”Codehighlighter1_3545_3597_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_3545_3597_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”><span id=”Codehighlighter1_3545_3597_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>returnnull;<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/InBlock.gif” align=”top”>returnViewState[”ChildProperty”].ToString();<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img id=”Codehighlighter1_3690_3729_Open_Image” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockStart.gif” align=”top”><img id=”Codehighlighter1_3690_3729_Closed_Image” style=”display: none” onclick=”code_collapse_toggle(this);” alt=”” src=”/Images/OutliningIndicators/ContractedSubBlock.gif” align=”top”>set<span id=”Codehighlighter1_3690_3729_Closed_Text” style=”border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border-left: #808080 1px solid; border-bottom: #808080 1px solid; background-color: #ffffff”><img alt=”” src=”https://www.jb51.cc/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif”>{ViewState[”ChildProperty”]=value;}<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>#endregion<img alt=”” src=”/Images/OutliningIndicators/ExpandedSubBlockEnd.gif” align=”top”>}<img alt=”” src=”/Images/OutliningIndicators/ExpandedBlockEnd.gif” align=”top”>}

具体调用示例：

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发布一款层次下拉列表控件

作者: dawei

作者: dawei

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