Surendra Sharma

Surendra Sharma

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Showing posts with label C#. Show all posts
Showing posts with label C#. Show all posts

Sunday, March 24, 2019

Code : Get any attribute value from HTML string in C#


If you have HTML string in C# and you want to get any particular value of any attribute then you can use below function which refer Regex to get its value.
In below program I am extraing “src” attribute value of HTML “img" tag.

Input string : <img alt="" src="/MediaCenter/PublishImages/DSC_0134.jpg" width="150" style="border:0px solid" />

Output : /MediaCenter/PublishImages/DSC_0134.jpg

Code:

using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            string s = "<img alt=\"\" src=\"/MediaCenter/PublishImages/DSC_0134.jpg\" width=\"150\" style=\"border:0px solid\" />";

            var srcs = GetSrcInHTMLImgString(s);
            Console.WriteLine(srcs[0]);//Output: /MediaCenter/PublishImages/DSC_0134.jpg
        }

        public static List<string> GetSrcInHTMLImgString(string htmlString)
        {
            List<string> srcs = new List<string>();
            string pattern = @"(?<=src="").*?(?="")";
           
            Regex rgx = new Regex(pattern, RegexOptions.IgnoreCase);
            MatchCollection matches = rgx.Matches(htmlString);

            for (int i = 0, l = matches.Count; i < l; i++)
            {
                string d = matches[i].Value;
                srcs.Add(d);
            }
            return srcs;
        }
    }
}

We can make this function more generic where we will pass any attribute name and get the value as

public static List<string> GetAttributeNameInHTMLString(string htmlString, string attributeName)
{
    List<string> attributeValues = new List<string>();
    string pattern = string.Format(@"(?<={0}="").*?(?="")", attributeName);

    Regex rgx = new Regex(pattern, RegexOptions.IgnoreCase);
    MatchCollection matches = rgx.Matches(htmlString);

    for (int i = 0, l = matches.Count; i < l; i++)
    {
        string d = matches[i].Value;
        attributeValues.Add(d);
    }
    return attributeValues;
}

Calling this function as

string s = "<img alt=\"\" src=\"/MediaCenter/PublishingImages/DSC_0134.jpg\" width=\"150\" style=\"border:0px solid\" />";

var widths = GetAttributeNameInHTMLString(s, "width");
Console.WriteLine(widths[0]);   //Output : 150

var styles = GetAttributeNameInHTMLString(s, "style");
Console.WriteLine(styles[0]);   //Output : border:0px solid

Its a small function but very handy. 

To test it, you can use C# online compiler “.NET Fiddle” instead of creating console application in Visual Studio. Many times I am using these online tools for quick testing. 

Let me know if you have any better idea to get attribute value from HTML string.

Friday, October 19, 2018

ebook : SharePoint to Sitecore: Strategy and Implementation


Sharing my 6th eBook with Sitecore community - "SharePoint to Sitecore: Strategy and Implementation".

SharePoint to Sitecore
SharePoint to Sitecore


There are multiple ways to move data and images from SharePoint to Sitecore. I tried my best to include all the approaches but explained one approach which worked for me in Sitecore 9 update 1 instance.

You can read and download this ebook from here:


I hope you like this eBook.

Please leave your comments or share this eBook if it’s useful for you.