C#的webBrowser中，搜索元素中的某些文字

[freewind1949]

想用webBrowser控件，导航到以下内容的页面，搜索"济芸斋" 三个字，返回　“米面油专用资格券18041601”，但搜索这块，总处理不好。

<div class="voucher-item voucher-gray-item" style="width:280px;height:122px;">
		                <div class="v-type" style="padding: 10px 0px 0px 15px;">
		                    <div class="v-price">
		                    	<div class="clearfix" style="width:185px;height:45px;overflow:hidden;">
		                        	<em></em>
		                        	<strong class="num" style="margin:0;font-size: 12px;line-height: 16px;">【济芸斋】名润大地-200盘锦蟹田珍珠米（5KG/袋）赠送奖券3张</strong>
		                        </div>
		                        <div class="txt" style="line-height:1;position:relative;top:6px;float:none;">
		                            <div class="limit"><span class="ftx-06">米面油专用资格券18041601</span></div>
		                        </div>
		                    </div>
		                    <div class="v-range">
		                        <div class="range-item">
			                            <p title="最多可领取[1]张</p>
		                        </div>
		                        <div class="range-item">
		                             2018.04.16-2018.04.17
		                        </div>
		                    </div>
		                </div>
	            		<div class="v-opbtns" style="height:122px;padding-top:13px;">
		                        <b class="semi-circle"></b>
		                        <span>已领完</span>
		                </div>
		                <div class="v-state">
		                    <div class="btn-state btn-getend"></div>
		                </div>
		            </div>

             int searchCount = 0;
            label1.Text = textBoxKey.Text;
            while (webBrowser1.ReadyState < WebBrowserReadyState.Complete)
                Application.DoEvents();          //若没加载完则继续加载  
           
            HtmlElementCollection div = webBrowser1.Document.GetElementsByTagName("div");
            for (int i = 0; i < div.Count; i++)
            {
                //div[contains(.,'text2')]/span[@class='value']
                if (div[i].GetAttribute("span").Contains("济芸斋"))
                //  if(div[i].GetElementsByTagName(label1.Text))
                {
                    HtmlElement divnk = div[i + 2].FirstChild;
                    MessageBox.Show(divnk.InnerHtml);
                    searchCount++;
                }
               
                   
            }
          if(searchCount==0)
            MessageBox.Show("查不到要找的内容");   

[freewind1949]

早上研究一小时，搞定了。

  private void button1_Click(object sender, EventArgs e)
        {
            int searchCount = 0;
            label1.Text = textBoxKey.Text;
         //   while (webBrowser1.ReadyState < WebBrowserReadyState.Complete)
          //      Application.DoEvents();          //若没加载完则继续加载  

            HtmlElementCollection div = webBrowser1.Document.GetElementsByTagName("span");
            for (int i = 0; i < div.Count; i++)
            {
               
                if (div[i].InnerHtml != null && div[i].InnerHtml.Contains(label1.Text))
                {
                    label2.Text = div[i].InnerHtml;
                    if (div[i + 1].InnerHtml != null)
                    {                        
                        MessageBox.Show(div[i].InnerHtml +" "+ div[i + 1].InnerHtml);
                        searchCount++;
                    }
                }               
                
            }

            if (searchCount == 0)
                label2.Text = "查不到要找的内容";
            else
                label2.Text = (label2.Text+" 共找到 "+searchCount+" 处");

        }