黄聪：Delphi 中的 XMLDocument 类详解(4) - 获取根目录下的元素数

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, xmldom, XMLIntf, msxmldom, XMLDoc, StdCtrls;

type
TForm1 = class(TForm)
XMLDocument1: TXMLDocument;
Button1: TButton;
Button2: TButton;
Button3: TButton;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

//打开
procedure TForm1.FormCreate(Sender: TObject);
begin
XMLDocument1.LoadFromFile('test.xml');
end;


//获取根目录下的元素数(1)
procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage(IntToStr(XMLDocument1.DocumentElement.ChildNodes.Count)); {4}
{DocumentElement 是根节点}
{ChildNodes 是节点包含的子节点的列表}
end;


//获取根目录下的元素数(2)
procedure TForm1.Button2Click(Sender: TObject);
var
nodeList: IXMLNodeList; {定义一个节点列表对象}
begin
nodeList := XMLDocument1.DocumentElement.ChildNodes;
{把根节点下的子节点列表赋给节点列表对象}

ShowMessage(IntToStr(nodeList.Count)); {4}
end;


//获取根目录下的元素数(3)
procedure TForm1.Button3Click(Sender: TObject);
var
node: IXMLNode; {定义一个节点对象}
nodeList: IXMLNodeList; {定义一个节点列表对象}
begin
node := XMLDocument1.DocumentElement;
{根节点也是一个节点, 把它赋给节点对象}

nodeList := node.ChildNodes;
ShowMessage(IntToStr(nodeList.Count)); {4}
end;

end.

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出处:http://www.cnblogs.com/del/archive/2008/01/03/1024407.html