C# 下控制 WebBrower 以及 HtmlDocument

C# 下带有 WebBrowser 控件，可以用 html 来完成图文混排，报表显示和打印，比前面提供的 vc++ 下使用 IHTMLDocument 容易很多。

 

下面是一个可以本地生成 html 文件的class:

 

              public CHtmlDocumentBase(WebBrowser browser, int bufferSize)

              {

                     m_Browser = browser;

                     m_Block = new StringBuilder(bufferSize);      //64K

                     m_Block.Length = 0;

              }

 

              public void BeginHtml(string title, string style)

              {

                     AppendLine("<html><head><title>" + title + "</title>");

                     AppendLine(style);

                     AppendLine("</head>");

                     AppendLine(@"<body bottomMargin=4 leftMargin=4 topMargin=4 rightMargin=1>");

              }

 

              public void Append(string text)

              {

                     m_Block.Append(text);

              }

 

              public void AppendTag(string tag, string text)

              {

                     m_Block.Append("<");

                     m_Block.Append(tag);

                     m_Block.Append(">");

                     m_Block.Append(text);

                     m_Block.Append("</");

                     m_Block.Append(tag);

                     m_Block.AppendLine(">");

              }

 

              public void AppendTag(string tag, string tag1, string text)

              {

                     m_Block.Append("<");

                     m_Block.Append(tag);

                     m_Block.Append(" " + tag1);

                     m_Block.Append(">");

                     m_Block.Append(text);

                     m_Block.Append("</");

                     m_Block.Append(tag);

                     m_Block.AppendLine(">");

              }

 

              public void AppendLine(string text)

              {

                     m_Block.AppendLine(text);

              }

 

              public void EndHtml()

              {

                     AppendLine("</body>");

                     AppendLine("</html>");

                     if (m_Browser != null) {

                            m_Browser.DocumentText = m_Block.ToString();

                            m_Block.Length = 0;

                     }

              }

 

              public void AssociateWithBrowser(WebBrowser browser)

              {

                     m_Browser = browser;

                     if (m_Browser != null) {

                            m_Browser.DocumentText = m_Block.ToString();

                            while (m_Browser.ReadyState != WebBrowserReadyState.Complete)

                                   Application.DoEvents();

                     }

              }

 

              public string GetDocumentString()

              {

                     return m_Block.ToString();

              }

 

              public void PrintPreview()

              {

                     m_Browser.Document.ExecCommand("Print", true, null);

              }

 

 

至于控制 htmlDocument, C# 下提供的功能有限，无法像 VC++下无所不能。不过如果在reference 中添加一个 Microsoft HTML Object Library, 则可以做到复杂的控制。比如下面一个例子，click 一个 DIV 的联接，控制这个 DIV 的折叠与展开。

 

      using mshtml;

 

        browser.Navigating += browser_Navigating;

 

 

        private void browser_Navigating(object sender, WebBrowserNavigatingEventArgs e)

        {

            if (browser.Document == null) return;

          

            string s = e.Url.Segments[e.Url.Segments.Length -1];

            HtmlElement he = browser.Document.GetElementById(s);

            if (he != null) {

                HTMLDivElement div = (HTMLDivElement) he.DomElement;

                div.style.display = div.style.display == "none" ? "block" : "none";

            }

             e.Cancel = true;

        }

    }

 

 

DIV 标记如下：

 

       <DIV class="DT">

              <A href="Definition1">Definition Time</A>

       </DIV>

       <DIV id="Definition1">

              <DIV class="D1">Pickup:</DIV>

              <DIV class="D2">120</DIV>

              <DIV class="D1">Delay:</DIV>

              <DIV class="D2">30</DIV>

       </DIV>