Using in HtmlDocument Class in Asp.net/SharePoint -Visual Web Part

Using in  HtmlDocument Class in Asp.net/SharePoint -Visual Web Part

 

I faced this situation where I have to read a HTML from a string, get the image tag manipulate and create a new image tag and return.

 

I tried to use HtmlDocument object from System.Window.Form, but it caused threading issue, after few googling got reference to the HTMLAgilityPack

Downloaded and added to my project. Below is the usage.

 

#region Get Image From HTML Text         /// <summary>         /// Get image tag from html text         /// </summary>         /// <param name="strHTML"></param>         /// <returns></returns>         public static string GetImageFromHTMLText(string strHTML)         {             //local varibales to store the image attributes             string strSrc = string.Empty;             string strWidth = string.Empty;             string strHeight = string.Empty;             string strAlt = string.Empty;             string strFinalImageText = string.Empty;             try             {                 //Using HTML Agility Pack downloaded from Codeplex - htmlagilitypack.codeplex.com                 //reduces the thread handling required if we use System.Windows.Form for HtmlDocument object                 HtmlAgilityPack.HtmlDocument htmlDoc = new HtmlDocument();                 //Loads the html                 htmlDoc.LoadHtml(strHTML);                 //foreach (HtmlNode img in doc.DocumentNode.SelectNodes("//img[@src]"))                 //loop thru the image tags - xsl for image -                 foreach (HtmlNode image in htmlDoc.DocumentNode.SelectNodes("//img"))                 {                     HtmlAttributeCollection attCollection = image.Attributes;                     strSrc = image.GetAttributeValue("src", null);                     strWidth = (image.GetAttributeValue("width", null) == null) ? "100" : image.GetAttributeValue("width", null);                     strHeight = (image.GetAttributeValue("height", null) == null) ? "100" : image.GetAttributeValue("height", null);                     strAlt = image.GetAttributeValue("alt", null);                 }                                                 //Get the intended size - here as 200px                 Size NewSize = GetResizedImageDimensions(int.Parse(strWidth), int.Parse(strHeight), 200, 160);                 //Creating the new image html string                 strFinalImageText = string.Format(@"<img width='{0}' height='{1}' alt='{2}', src='{3}'/>", NewSize.Width, NewSize.Height, strAlt, strSrc);             }             catch (Exception ex)             {                 PortalLog.LogString("Exception occrured in Get Image innter HTML" + ex.Message);             }             return strFinalImageText;         }         #endregion

 

Thanks for reading..

If you have a more elegant solution/suggestion – please post a comment… I’ll be happy to hear.

...HaPpY CoDiNg

Partha (Aurum)