C#递归增加、删除树节点(TreeView)

 

使用存储过程找出所有的子节点(用于删除节点)

create PROCEDURE UserClassDeleteAllNodeUsedProcedure

@ClassID nchar(10)

AS
declare @id int
set @id=@ClassID;
with RootNodeCTE(id,ParentID)
as
(
Select ClassID,ParentID from Tb_UserClass
where ParentID in (@id)

Union all
Select Tb_UserClass.ClassID,Tb_UserClass.ParentID
From RootNodeCTE
inner join Tb_UserClass on RootNodeCTE.id=Tb_UserClass.ParentID
)
delete from Tb_UserClass
Where ClassID In
(
Select id from RootNodeCTE
union all
Select @classid
)


递归源码：

using System;

using System.Collections.Generic;

using System.Text;

using System.Windows.Forms;

using System.Data.SqlClient;

using System.Data;

namespace Comm

{
public class TreeView
{
QueryLibrary.QuerySql query;
//执行sql命令
SqlCommand cmd;
public TreeView()
{
query = new QueryLibrary.QuerySql();
cmd = new SqlCommand();
cmd.CommandType = CommandType.StoredProcedure;

}

/// <summary>
/// 节点初始化
/// </summary>
/// <param name="TNode"></param>
public void UserClassGetNodeInit(TreeNode TNode)
{
DataSet ds = new DataSet();
cmd.CommandText = "UserClassGet";
cmd.Parameters.Clear();
cmd.Parameters.Add("@ParentID", SqlDbType.NChar, 10).Value = TNode.Tag;

try
{
ds=query.GetDataSet(cmd);
}
catch{}

foreach (DataRow dr in ds.Tables[0].Rows)
{
TreeNode TN_Parent = new TreeNode();
TreeNode TN_child = new TreeNode();
TN_Parent = TNode;

TN_child.Tag = dr["ClassID"].ToString();
TN_child.Text = dr["ClassName"].ToString();

TNode.Nodes.Add(TN_child);

UserClassGetNodeInit(TN_child);
}
}

/// <summary>
/// 查找所选节点
/// </summary>
/// <param name="TNode"></param>
/// <returns></returns>
public DataSet UserClassGet(TreeNode TNode)
{
DataSet ds = new DataSet();
cmd.CommandText = "UserClassGet";
cmd.Parameters.Clear();
cmd.Parameters.Add("@ParentID", SqlDbType.NChar, 10).Value = TNode.Tag;

try
{
ds = query.GetDataSet(cmd);
}
catch { }
return ds;
}
/// <summary>
/// 节点增加
/// </summary>
/// <param name="ClassID"></param>
/// <param name="ClassName"></param>
/// <param name="ParentID"></param>
/// <returns></returns>
public bool UserClassADD(string ClassID,string ClassName,string ParentID)
{
cmd.CommandText = "UserClassADD";
cmd.Parameters.Clear();
cmd.Parameters.Add("@ClassID", SqlDbType.NChar, 10).Value = ClassID.Trim();
cmd.Parameters.Add("@ClassName", SqlDbType.NChar, 10).Value = ClassName.Trim();
cmd.Parameters.Add("@ParentID", SqlDbType.NChar, 10).Value = ParentID.Trim();

try
{
int i = query.IntExecuteNonQuery(cmd);
if (i > 0)
{
return true;
}
else
{
return false;
}
}
catch
{
return false;
}
}
public int UserClassGetMaxClassID()
{