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WebBroswer In C#

08. Apr, 2006 by admin 0 Comments

If you want to write into webbrowser in windows form in C#,you have to make reference MSHTML library and use its interface to do so.The trick is, if you did this in ASP or Visual Basic, you can simply put

wb.document.write(sHtml)

where wb is WebBrowser a object and sHtml is a string.

In .Net it works differently. You can create sample project in VB.6 and loadit into VB.NET.
It would complains about bad type variable, but will compile and run(surprisingly, if just create such a VB.NET project from the scratch, it will complain and not compile!)

The following approach shows how to make that functionality with the righttypes.

Put into C# windows form
1. text box txt1 (System.Windows.Forms.TextBox)
2. Web Browser WBresult (AxSHDocVw.AxWebBrowser)
3. button to run the code
4. make reference to MSHTML library
5. add two functions: fillWeb (which does the real job) andredirectWeb(redirects to url, file, or clears)
6. on button click event function putfillWeb("<asd>top linebold</asd>

another line

");
7. run the project and click on the button (if you have any errors, theywould appear in text box)

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

using mshtml;

// …
// here is the main functionality for web control to get/fill/redirect web
content:

private string getWeb()
{
string s = "";
try
{
object boxDoc = axWebBrowser1.Document;
IHTMLDocument2 hDoc = (mshtml.IHTMLDocument2)boxDoc;
s += hDoc.body.innerText; // or innerHtml
return s;
}
catch(Exception exc)
{
s += exc.Message;
return s;
}
finally
{
}
}

private void fillWeb(string sHTML)
{
redirectWeb("about:blank");
try
{
object[] psa = {sHTML};//could be:{"bold",
"<i>italic</i>"};
IHTMLDocument2 hDoc2 = (IHTMLDocument2)axWebBrowser1.Document;
hDoc2.write(psa);

}
catch(Exception exc)
{
txt1.Text = exc.Message;
}
}

private void redirectWeb(string sUrl)
{
try
{
axWebBrowser1.Visible = true;
axWebBrowser1.BringToFront();
// System.Object nullObject = 0;
// System.Object nullObjStr = "";
// axWebBrowser1.Navigate(sUrl, ref nullObject, ref
nullObjStr, ref nullObjStr, ref nullObjStr);
Object n = null;
axWebBrowser1.Navigate(sUrl, ref n, ref n, ref n, ref n);
}
catch(Exception exc)
{
txt1.Text = exc.Message;
}
}