private string ReplaceElements(string html) { string patten = @"<\s*div[^>]*>(.*?)<\s*/div\s*>"; string wrapper = @"<div class=""Highlighter"">{0}</div>"; MatchCollection collection = Regex.Matches(html, patten); foreach (Match match in collection) { string value = match.Value; int marker = value.IndexOf(">"); string innterHtml = value.Substring(marker + 1, value.Length - (marker + 7)); if (Regex.Match(innterHtml, patten).Success) innterHtml = this.ReplaceElements(innterHtml); string wrappedText = string.Format(wrapper, innterHtml); string modifiedValue = value.Replace(innterHtml, wrappedText); html = html.Replace(value, modifiedValue); } return html; } protected override void Render(HtmlTextWriter writer) { string html = @" <html> <head> <title>Test Page</title> <style> div.Highlighter { border:solid 1px #f00; margin:10px; } </style> </head> <body> <div class=""Div""><p>Hello World</p></div> <div class=""Div"" runat=""server"">Div 1</div> <div class=""Div"" id=""LoginId"">Div 2</div> <div class=""Div"" width=""50%"">Div 3</div> <div class=""Div"">Div 4</div> </body> </html> "; writer.Write("<h1>Before</h1>"); writer.Write("<hr />"); writer.Write(html); writer.Write("<h1>After</h1>"); writer.Write("<hr />"); html = this.ReplaceElements(html); writer.Write(html); }
Wednesday, June 23, 2010
How to replace html content inside html using c# - Asp.net
This example demonstrate how to replace HTML element content (innerHtml) using c#. I have used regular expressions to match elements. However this example does not support nested eleements:
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