小鸟请教问题

Question

在web开发中，好像不能使用MessageBox.

Answer 1

树形结构用TreeView,
如果从数据库取数据的话，用递归
using System;
using System.Collections;namespace SampleTree
{
public class TreeNode
{
#region The TreeNodeCollection class.
public class TreeNodeCollection:ICollection
{
private TreeNode _owner=null;
private ArrayList _innerList=new ArrayList(); public TreeNodeCollection(TreeNode owner)
{
this._owner=owner;
}
public TreeNode this[int index]
{
get{return (TreeNode)this._innerList[index];}
set
{
if(value ==null)
throw new ArgumentNullException();
(this._innerList[index] as TreeNode)._parent=null;;
value._parent=this._owner;
this._innerList[index]=value;
}
}
public bool IsSynchronized
{
get{ return this._innerList.IsSynchronized;}
}
public int Count
{
get{ return this._innerList.Count;}
}
public void CopyTo(Array array, int index)
{
this._innerList.CopyTo(array,index);
}
public object SyncRoot
{
get
{
return this._innerList.SyncRoot;
}
}
public IEnumerator GetEnumerator()
{
return this._innerList.GetEnumerator();
} public int Add(TreeNode value)
{
if(value ==null)
throw new ArgumentNullException();
value._parent=this._owner;
return this._innerList.Add(value);
} public void Insert(int index, TreeNode value)
{
if(value ==null)
throw new ArgumentNullException();
value._parent=this._owner;
this._innerList.IndexOf(value,index);
} public void RemoveAt(int index)
{
try
{
this[index]._parent=null;
this._innerList.RemoveAt(index);
}
catch
{
}
}
public int IndexOf(TreeNode value)
{
return this._innerList.IndexOf(value);
}
public void Clear()
{
for(int i=0;i<this.Count;i++)
{
this[i]._parent=null;
}
this._innerList.Clear();
}
public bool Contains(TreeNode value)
{
return this._innerList.Contains(value);
}
}
#endregion

private TreeNode _parent=null;
private string _value=null;
private TreeNodeCollection _childNodes=null; public TreeNode(string value)
{
this._value=value;
}
public TreeNode ParentNode
{
get{return this._parent;}
}
public string Value
{
get{return this._value;}
}
public TreeNodeCollection ChildNodes
{
get
{
if(this._childNodes !=null) return this._childNodes;
this._childNodes=new TreeNodeCollection(this);
return this._childNodes;
}
}
public bool IsRoot
{
get{return this.ParentNode==null;}
}
public bool IsLeaf
{
get
{
return this._childNodes==null || this._childNodes.Count==0;
}
}
public string Location
{
get
{
string location=string.Empty;
TreeNode treeNode=this;
while(treeNode.ParentNode!=null)
{
treeNode=treeNode.ParentNode;
location=treeNode.Value+@"|"+location;
}
return this.Location;
}
}
}
public class Tree
{
private TreeNode.TreeNodeCollection  _nodes=new TreeNode.TreeNodeCollection(null); public TreeNode.TreeNodeCollection Nodes
{
get{return this._nodes;}
}
public TreeNode SearchNode(string location)
{
string[] loc=location.Split(new char[]{'|'});
if(loc.Length==0) return null;
TreeNode treeNode=null;
for(int i=0;i<this.Nodes.Count;i++)
{
if(this.Nodes[i].Value==loc[0])
{
treeNode=this.Nodes[i]; break;
}
}
int c=1;
while(treeNode!=null && c<loc.Length)
{
for(int i=0;i<treeNode.ChildNodes.Count;i++)
{
if(treeNode.ChildNodes[i].Value==loc[c])
{
treeNode=treeNode.ChildNodes[i];
c++;
}
}
treeNode=null;
}
return treeNode;
}
}
}

Answer 2

Web下的对话框如下：
1...Page.RegisterClientScriptBlock("你自己定义的注册字符"，“你的脚本块”），在客户端
将出现在<form>后。
2...Response.Write("<script language=javascript>alert('dkgj');</script>");
3..Response.Write("<script language = jscript>alert('" + 你的提示信息 + "')</script>");

Answer 3

简单的示例： //***********class treenode   ******************
class TreeNode
{
protected int nodedata;

public TreeNode(int a)
{
nodedata=a;
}
//default state nodedata=0
public TreeNode()
{
nodedata=0;
}
public int NodeData
{
get
{
return nodedata;
}
set
{
nodedata = value;
}
}
//abstract public void CopyTo(TreeNode t);
}
//***********class twaintreenode ***************
class TwaintreeNode:TreeNode
{
protected TwaintreeNode  leftchild;
protected TwaintreeNode rightchild; public TwaintreeNode()
{
//base.NodeData=a;
leftchild=null;
rightchild=null;
}
public TwaintreeNode(int a)
{
leftchild=null;
rightchild=null;
this.nodeData=a;
}
/*public TwaintreeNode GetLeftchild()
{
return leftchild;
}
public TwaintreeNode GetRightchild()
{
return rightchild;
}*/
public TwaintreeNode LeftChild
{
get
{
return leftchild;
}
set
{
leftchild = value;
}
}
public  TwaintreeNode RightChild
{
get
{
return rightchild;
}
set
{
rightchild = value;
}
}
public void CopyTo(TwaintreeNode t)
{
if(t==null)
t = new TwaintreeNode();
if(this==null) return;
t.nodedata=this.nodedata;
t.leftchild=this.leftchild;
t.rightchild=this.rightchild;
}
public int nodeData
{
get
{
return this.NodeData;
}
set
{
this.NodeData = value;
}
}
}
//*************class findtwaintree**************
class FindtwainTree
{
protected TwaintreeNode boot;
private  int nodenum; //three types makefunction
public FindtwainTree()
{
boot = null;
nodenum=0;
}
public FindtwainTree( int b)
{
boot = new TwaintreeNode(b);
nodenum++;
}
public FindtwainTree(TwaintreeNode b)
{
boot=b;
nodenum++;
} public TwaintreeNode Boot
{
get
{
return boot;
}
set
{
boot = value;
}
} //use twaintreenode make tree
private void addNode(TwaintreeNode t,TwaintreeNode s)
{
if(t==null)
{
t=s;
return ;
}
if(s.nodeData<=t.nodeData)
addNode(t.LeftChild,s);
if(s.nodeData>t.nodeData)
addNode(t.RightChild,s); }
// use data of twaintreenode make tree
private void addNode(TwaintreeNode t,int a)
{
/*if(t==null)
{
t = new TwaintreeNode(a);
return;
}*/

if(a<t.nodeData)
{
if(t.LeftChild==null)
{
t.LeftChild=new TwaintreeNode(a);
return;
}
addNode(t.LeftChild,a);
}
if(a>=t.nodeData)
{
if(t.RightChild==null)
{
t.RightChild=new TwaintreeNode(a);
return;
}
addNode(t.RightChild,a);
}
}
public void AddNode(TwaintreeNode d)
{
if(boot==null)
boot=d;
else
{
addNode(boot,d);
}
nodenum++;
}
//build the tree using data of twaintreenode
public void AddNode(int d)
{
if(boot==null)
{
boot = new TwaintreeNode(d);
}
else
addNode(boot,d);
nodenum++;
}
｝