树TreeView控件与DataTable交互添加节点（最高效的方法）

#region "读取树结点从Datatable"
/// <summary>
/// 读取树结点从Datatable"
/// </summary>
/// <param name="TreeView1">在填充的TreeView控件</param>
/// <param name="DT">数据源DataTable</param>
/// <param name="IsAppendNode">是在现有TreeView控件上添加结点，还是清空再添加</param>
/// <param name="ParentNumberColumnIndex">在DataTable中，代表父节点编号的列索引</param>
/// <param name="NumberColumnIndex">在DataTable中，代表当前节点编号的列索引</param>
/// <param name="NameColumnIndex">在DataTable中，代表当前节点名称的列索引</param>
/// <returns>True/False</returns>
public bool ReadNodesFromDataTable(TreeView TreeView1, DataTable DT, bool IsAppendNode, int ParentNumberColumnIndex, int NumberColumnIndex, int NameColumnIndex)
{
try
{
if (IsAppendNode == false)
{
TreeView1.Nodes.Clear();
}
if (DT != null && DT.Rows.Count > 0)
{
DataRow[] DR = null;
DR = DT.Select(DT.Columns[ParentNumberColumnIndex].ColumnName + "='' or " + DT.Columns[ParentNumberColumnIndex].ColumnName + "='0' or " + DT.Columns[ParentNumberColumnIndex].ColumnName + " is null");//先将顶级的查出来
for (int I = 0; I <= DR.Length - 1; I++)//先将顶级的加入到TreeView中
{
TreeNode TNode = new TreeNode(DR[I][DT.Columns[NameColumnIndex].ColumnName].ToString());
TNode.Tag = DR[I][DT.Columns[NumberColumnIndex].ColumnName].ToString();
TNode.Name = DR[I][DT.Columns[NameColumnIndex].ColumnName].ToString();
TreeView1.Nodes.Add(TNode);
}
for (int I = 0; I <= TreeView1.Nodes.Count - 1; I++)//再递归遍历结点
{
ForTreeNodeFormDT(TreeView1.Nodes[I], DT, ParentNumberColumnIndex, NumberColumnIndex, NameColumnIndex);
}
}
return false;
}
catch
{
return true;
}
}

/// <summary>
/// 从DT中递归遍历出结点
/// </summary>
/// <param name="TempNode">传入的顶级结点</param>
/// <param name="DT">保存TreeView结构的DataTable</param>
/// <param name="ParentNumberColumnIndex">在DataTable中，代表父节点编号的列索引</param>
/// <param name="NumberColumnIndex">在DataTable中，代表当前节点编号的列索引</param>
/// <param name="NameColumnIndex">在DataTable中，代表当前节点名称的列索引</param>
private void ForTreeNodeFormDT(TreeNode TempNode, DataTable DT, int ParentNumberColumnIndex, int NumberColumnIndex, int NameColumnIndex)
{
string TTag = null;
TTag = TempNode.Tag.ToString();
DataRow[] DR = null;
DR = DT.Select(DT.Columns[ParentNumberColumnIndex].ColumnName + "='" + TTag + "'");

for (int I = 0; I <= DR.Length - 1; I++)
{
TreeNode TNode = new TreeNode(DR[I][DT.Columns[NameColumnIndex].ColumnName].ToString());
TNode.Tag = DR[I][DT.Columns[NumberColumnIndex].ColumnName].ToString();
TNode.Name = DR[I][DT.Columns[NameColumnIndex].ColumnName].ToString();
TempNode.Nodes.Add(TNode);
}

foreach (TreeNode aNode in TempNode.Nodes)
{
ForTreeNodeFormDT(aNode, DT, ParentNumberColumnIndex, NumberColumnIndex, NameColumnIndex);
}
}
#endregion