写完一部分代码。都快要四点了。最近做项目,好久没有往博客上放东西了。趁着还有些精神,赶紧把上次没有发布的代码补上。使用TreeList都有两个月了。发现自己使用它的Tag属性达到了变态的地步,在Tag属性里放的Struct里面的东西越来越多。在某种程度上。没有这个属性。我的好多工作是无法完成的。考虑到装箱和拆箱的过程,却也无可奈何。这是一个通过DataTable来自动绑定TreeList的类,考虑到了部分数据显示和部分字段显示,在每个SimpleBind的重载中都加入了这一部分的处理,强调一点。我所处理的数据都是以父子节点为基础的绑定。同时。子节点是以1开始。父节点是以0开始。这样在存入父子节点ID的时候要注意。代码如下,谨供自己和自己一样的菜鸟参考。
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using System.Collections ;
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using System.Data ;
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using BusinessEntity;
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using PersistenceLayer;
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using DevExpress.XtraTreeList ;
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using DevExpress.XtraTreeList.Nodes ;
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using DevExpress.XtraTreeList.Columns ;
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namespace NskProject
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{
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/// <summary>
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/// 一些实现或辅助绑定TreeList的静态方法。
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/// </summary>
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public class BindTreeList
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{
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/// <summary>
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/// 初级绑定方法,给定的表中有父子关系的字字段,默认情况下表内所有字段都被绑定到控件内
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/// </summary>
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/// <param name="Dt">数据源表</param>
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/// <param name="Ti">需要绑定的控件</param>
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public static void SimpleMode(DataTable Dt,TreeList Ti)
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{
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if(ParentFieldName==null && ChildFieldName==null)
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{
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return;
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}
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Ti.ParentFieldName=ParentFieldName;
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Ti.KeyFieldName=ChildFieldName;
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Ti.DataSource=Dt;
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Ti.PopulateColumns();
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return;
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}
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/// <summary>
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/// 初级绑定方法:在前一方法的基础上增加了将某一字段加入到Tag属性中去。保存附加信息
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/// 该表在赋值前以父节点为基础进行了排序
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/// </summary>
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/// <param name="Dt">数据源表</param>
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/// <param name="TagColum">附加到Tag属性中的字段</param>
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/// <param name="Ti">需要绑定的控件</param>
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public static void SimpleMode(DataTable Dt,DataColumn TagColumn,TreeList Ti)
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{
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if(ParentFieldName==null && ChildFieldName==null)
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{
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return;
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}
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int TagColumnIndex=Dt.Columns.IndexOf(TagColumn);
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foreach(DataRow dr in Dt.Rows)
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{
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object[] Data=new object[Dt.Columns.Count-3];
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object Tag=new object() ;
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Object[]Source=dr.ItemArray;
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int count=0;
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//显示数据与附加数据分离
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for(int i=0;i<Source.Length;i++)
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{
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if(i!=TagColumnIndex &&i!=-1)
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{
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Data[count]=Source[count];
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count++;
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}
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else
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{
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Tag=Source[i];
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}
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}
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int ParentID=Convert.ToInt32(dr[ParentFieldName]);
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int ChildID=Convert.ToInt32(dr[ChildFieldName]);
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int Balance=0;
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if(ParentID==0)
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{
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TreeListNode Node=Ti.AppendNode(Data,null);
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Node.Tag=Tag;
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if(Node.Id!=ChildID)
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{
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Balance=ChildID;
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//可能存在只取一部分数据的情况,在这种情况下,取控件内ID与表内ID之间的差额
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}
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}
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else
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{
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TreeListNode ParentNode;
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if(Balance>0)//两种不同情况的取得父节点的方法
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{
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ParentNode=Ti.FindNodeByID(ParentID-Balance);
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}
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else
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{
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ParentNode=Ti.FindNodeByID(ParentID-1);
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}
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if(ParentNode!=null)
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{
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TreeListNode Node=Ti.AppendNode(Data,ParentNode);
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Node.Tag=Tag;
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}
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}
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}
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}
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/// <summary>
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/// 针对有时候并不是加载一张表内的所有内容,对此加以变形,对于存在于表中不在列表内的字段
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/// 给删除,对于不在表内而在列表内的值赋空值加入列表内
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/// </summary>
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/// <param name="Dt">数据源表</param>
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/// <param name="FieldList">需要在TreeList中显示的字段列表</param>
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/// <param name="Ti">需要绑定的控件</param>
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public static void SimpleMode(DataTable Dt,string Fields,TreeList Ti)
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{
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Ti.Nodes.Clear();
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int Balance=0;
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string[] FieldList=Fields.Split(",".ToCharArray());
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if(ParentFieldName==null && ChildFieldName==null)
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{
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return;
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}
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foreach(DataRow dr in Dt.Rows)
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{
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int index=0;
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Object[] Data=new object[FieldList.Length];
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foreach(string o in FieldList)
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{
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if(Dt.Columns.IndexOf(o)>-1)
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{
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string n=dr[o].ToString().Trim();
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Data[index]=n;
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}
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else
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{
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Data[index]="";
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}
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index++;
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}
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int ParentID=Convert.ToInt32(dr[ParentFieldName]);
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int ChildID=Convert.ToInt32(dr[ChildFieldName]);
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if(ParentID==0)
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{
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TreeListNode Node=Ti.AppendNode(Data,null);
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if(Node.Id!=ChildID-1)
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{
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Balance=Node.Id<ChildID?ChildID-Node.Id:Node.Id-ChildID;
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//可能存在只取一部分数据的情况,在这种情况下,取控件内ID与表内ID之间的差额
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}
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}
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else
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{
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TreeListNode ParentNode;
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if(Balance>0)//两种不同情况的取得父节点的方法
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{
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ParentNode=Ti.FindNodeByID(ParentID-Balance);
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}
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else
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{
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ParentNode=Ti.FindNodeByID(ParentID-1);
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}
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if(ParentNode!=null)
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{
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TreeListNode Node=Ti.AppendNode(Data,ParentNode);
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}
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}
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}
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="Dt"></param>
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/// <param name="Fields"></param>
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/// <param name="Ti"></param>
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/// <param name="TagColumn"></param>
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public static void SimpleMode(DataTable Dt,string Fields,TreeList Ti,string TagColumn)
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{
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Ti.Nodes.Clear();
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int Balance=0;
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string[] FieldList=Fields.Split(",".ToCharArray());
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if(ParentFieldName==null && ChildFieldName==null)
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{
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return;
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}
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foreach(DataRow dr in Dt.Rows)
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{
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int index=0;
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Object[] Data=new object[FieldList.Length];
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foreach(string o in FieldList)
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{
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if(o!=TagColumn && Dt.Columns.IndexOf(o)>-1)
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{
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string n=dr[o].ToString().Trim();
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Data[index]=n;
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}
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else
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{
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Data[index]="";
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}
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index++;
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}
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int ParentID=Convert.ToInt32(dr[ParentFieldName]);
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int ChildID=Convert.ToInt32(dr[ChildFieldName]);
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if(ParentID==0)
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{
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TreeListNode Node=Ti.AppendNode(Data,null);
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Node.Tag =dr[TagColumn];
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if(Node.Id!=ChildID)
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{
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Balance=ChildID;
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//可能存在只取一部分数据的情况,在这种情况下,取控件内ID与表内ID之间的差额
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}
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}
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else
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{
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TreeListNode ParentNode;
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if(Balance>0)//两种不同情况的取得父节点的方法
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{
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ParentNode=Ti.FindNodeByID(ParentID-Balance);
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}
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else
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{
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ParentNode=Ti.FindNodeByID(ParentID-1);
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}
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if(ParentNode!=null)
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{
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TreeListNode Node=Ti.AppendNode(Data,ParentNode);
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Node.Tag =dr[TagColumn];
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}
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}
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}
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}
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private static string _ParentFieldName="";
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private static string _ChildFieldName="";
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public static string ParentFieldName
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{
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get{return _ParentFieldName;}
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set{_ParentFieldName=value;}
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}
237![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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public static string ChildFieldName
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{
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get{return _ChildFieldName;}
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set{_ChildFieldName=value;}
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}
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}
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}
246![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
这是一个静态方法,在执行SimpleBind方法前。必须对ChildFieldName和ParentFieldName进行赋值,它们对应着Dt中的父子节点的列名。
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