4递归实现阶乘计算器 5递归实现TreeView绑定表MenuTree

4递归实现阶乘计算器

aspx:

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><asp:Label ID="Label1" runat="server"

Text="的阶乘="></asp:Label><asp:TextBox ID="TextBox2" runat="server"></asp:TextBox><asp:Button

ID="Button1" runat="server" Text="计算" Xonclick="Button1_Click"

Width="57px" />

aspx.cs:

protected void Button1_Click(object sender, EventArgs e)

{

TextBox2.Text= multiply(Convert.ToInt32(TextBox1.Text)).ToString();

}

public static int multiply(int n)

{

if (n == 0)

{

return 1;

}

else

{

return n * (multiply(n - 1));

}

}

5递归实现TreeView绑定表MenuTree

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Configuration;

using System.Data;

using System.Data.SqlClient;

namespace TreeViewDemo

{

public partial class TreeDemo3 : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

bindTree();

}

private void bindTree()

{

DataTable dt = this.GetTreeData();

this.FillNode(dt, null);

}

private void FillNode(DataTable dt, TreeNode node)

{

DataView dv = new DataView(dt);

if (node == null) //根结点

{

dv.RowFilter = "parentid='0'"; //筛选到根结点的所有子节点

}

else //不是根结点

{

dv.RowFilter = "parentid='" + node.Value + "'"; //筛选对应节点的所有子节点

}

foreach (DataRowView drv in dv) //遍历填充节点的所有子节点，如果传入的节点node为叶子节点，遍历要退出，不再进行递归

{

TreeNode no = new TreeNode(drv["menuname"].ToString(), drv["menuid"].ToString());

FillNode(dt, no); //填充no节点的子节点

if (node == null)

{

this.TreeView1.Nodes.Add(no);

}

else

{

node.ChildNodes.Add(no);

}

}

}

private DataTable GetTreeData()

{

string strcnn = ConfigurationManager.ConnectionStrings["treeCon"].ConnectionString;

using (SqlConnection sqlcnn = new SqlConnection(strcnn))

{

SqlCommand sqlcmm = sqlcnn.CreateCommand();

sqlcmm.CommandText = "select * from MenuTree order by parentid,menuorder";

SqlDataAdapter da = new SqlDataAdapter(sqlcmm);

DataSet ds = new DataSet();

da.Fill(ds);

return ds.Tables[0];

}

}

}

}