【树形】ASP.NET生成树形显示的GridView实现思路-GridView

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ASP.NET生成树形显示的GridView实现思路

using System;
using System.Data;
/// <summary>
///GridViewHelper 的摘要说明
/// </summary>
public class GridViewHelper
{
private string gridline; //连接线
private DataTable dt; //传入的DataTable
private DataTable dtOut; //输出的DataTable
private DataRow row; //用于从DataView取数据并增加到dtOut
public GridViewHelper()
{
//
//TODO: 在此处添加构造函数逻辑
//
}
/// <summary>
/// 生成树形结构的DataTable
/// </summary>
/// <param name="datatable">原始数据表</param>
/// <param name="parentField">上级节点关键字段</param>
/// <param name="parentValue">上级节点值</param>
/// <param name="keyField">本节点关键字段</param>
/// <param name="textField">显示的文本字段</param>
/// <param name="sortString">排序字符串</param>
/// <returns>处理后的DataTable</returns>
public DataTable GetGridViewTreeData(DataTable datatable, string parentField, string parentValue, string keyField, string textField, string sortString)
{
datatable.Columns.Add("level", Type.GetType("System.Int32"));
dt=datatable;
dtOut=datatable.Clone();
resetTextField(parentField, parentValue, keyField, textField, sortString, 0);
return dtOut;
}
/// <summary>
/// 递归生成新的节点名称(带连接线)
/// </summary>
/// <param name="parentValueField">上级节点关键字段</param>
/// <param name="parentValue">上级节点值</param>
/// <param name="keyField">本节点关键字段</param>
/// <param name="textField">显示出来的文本字段</param>
/// <param name="sortString">排序字符串</param>
/// <param name="level">树深度</param>
/// <returns></returns>
private void resetTextField(string parentValueField, string parentValue, string keyField, string textField, string sortString,int level)
{
DataView dv=new DataView(dt, parentValueField + "='" + parentValue + "'", sortString, DataViewRowState.CurrentRows);
int a=dv.Count;
if (dv.Count==0)
{
return;
}
for (int i=0; i < a; i++)
{
gridline="";
dv.RowFilter=parentValueField + "='" + parentValue + "'";
dv.Sort=sortString;
getTreeLine(parentValueField, dv[i][parentValueField].ToString(), keyField, dv[i][keyField].ToString(), sortString);
dv.RowFilter=parentValueField + "='" + parentValue + "'";
dv.Sort=sortString;
row=dtOut.NewRow();
for (int c=0; c < dv[i].Row.ItemArray.Length; c++)
{
row[c]=dv[i][c];
}
dtOut.Rows.Add(row);
dtOut.Rows[dtOut.Rows.Count - 1][textField]=gridline + (i==a - 1 ? "┗" : "┣") + dv[i][textField].ToString();
dtOut.Rows[dtOut.Rows.Count - 1]["level"]=level;
resetTextField(parentValueField, dv[i][keyField].ToString(), keyField, textField, sortString,level+1);
}
dv.Dispose();
}
/// <summary>
/// 回溯生成树的连接线
/// </summary>
/// <param name="parentValueField">上级节点关键字段</param>
/// <param name="parentValue">上级节点值</param>
/// <param name="keyField">本节点关键字段</param>
/// <param name="nodeKey">本节点值</param>
/// <param name="sortString">排序字符串</param>
/// <returns></returns>
private void getTreeLine(string parentValueField, string parentValue, string keyField, string nodeKey, string sortString)
{
//选择父层节点
DataView dv=new DataView(dt, keyField + "='" + parentValue + "'", sortString, DataViewRowState.CurrentRows);
if (dv.Count > 0)
{
//选择父节点同级节点
dv.RowFilter=parentValueField + "='" + dv[0][parentValueField].ToString() + "'";
dv.Sort=sortString;
for (int j=0; j < dv.Count; j++)
{
if (dv[j][keyField].ToString()==parentValue)
{
if (j==dv.Count - 1)
{
gridline="　" + gridline;
}
else
{
gridline="┃" + gridline;
}
}
}
getTreeLine(parentValueField, dv[0][parentValueField].ToString(), keyField, dv[0][keyField].ToString(), sortString);
}
dv.Dispose();
}
}

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