get获取网页 document

我这里有源代码，usingSystem;usingSystemCollectionsGeneric;usingSystemComponentModel;usingSystemData;usingSystemDrawing;usingSystemLinq;usingSystemText;usingSystemWindowsForms;usingSystemTextRegularExpressions;usingSystemNet;namespaceDownPic{publicpartialclassForm1:Form{publicForm1(){InitializeComponent();}privatestaticInt64i=0;publicstaticstring[]GetHtmlImageUrlList(stringsHtmlText){//定义正则表达式用来匹配img标签RegexregImg=newRegex(@"]\bsrc[\s\t\r\n]=[\s\t\r\n][""'][\s\t\r\n]([^\s\t\r\n""'])[^]/[\s\t\r\n]>",RegexOptionsIgnoreCase);//搜索匹配的字符串MatchCollectionmatches=regImgMatches(sHtmlText);//inti=0;string[]sUrlList=newstring[matchesCount];//取得匹配项列表foreach(Matchmatchinmatches)sUrlList[i++]=matchGroups["imgUrl"]Value;returnsUrlList;}privatevoidbutton1_Click(objectsender,EventArgse){if(folderBrowserDialog_CShowDialog()==DialogResultOK){textBox_CText=folderBrowserDialog_CSelectedPath;if(textBox_CTextLength>3){textBox_CText=textBox_CText+"\\";}}}privatestringresult=null;privatestringstyle(){stringchoose=null;if(radioButton_jpgChecked){choose=radioButton_jpgText;}elseif(radioButton_pngChecked){choose=radioButton_pngText;}return""+choose;}privatestaticInt64k=1;privatevoidbutton2_Click(objectsender,EventArgse){try{WebClientclient=newWebClient();clientEncoding=SystemTextASCIIEncodingUTF8;result=clientDownloadString(textBox_urlText);}catch(Exceptionex){MessageBoxShow("请输入地址！","警告",MessageBoxButtonsOK,MessageBoxIconWarning);}richTextBox_resourceText=result;try{RegexregImg=newRegex(@"]+src=\s(:'([^']+)'|""([^""]+)""|([^>\s]+))\s[^>]>",RegexOptionsIgnoreCase);string[]s=GetHtmlImageUrlList(result);string[]filepath=newstring[sLength];for(Int64j=0;j

iframe：

content: '<iframe id="iframe1" src="" style="" frameborder="no" border="0" marginwidth="0" marginheight="0" scrolling="no" allowtransparency="yes"></iframe>'

方法：

var a = documentgetElementById('iframe1')contentWindowdocumentgetElementById('a)value; //输入值

var a= documentgetElementById('iframe1')contentWindowdocumentgetElementById('a')defaultValue; //默认值

如果是获取表单里的变量的值，可以这样获得：

documentforms['form的名字']elements['show11']value;

--但细看你提供的代码里，没有 表单的标记 form 标记

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