如何从C＃中的img html标签获取图像源属性值？

Question

My string variable stores set of HTML Tags along with img source file link.

string str = "<div> <img src="https://i.testimg.com/images/g/test/s-l400.jpg" style="width: 100%;"> <div>Test</div> </div>"

How to get the src attribute value from the string str. Apparently, i will have to assign the value of src to another variable.

How to get src attribute value from img html tag in c#?

Answer 1

The following code will extract the value of the src attribute.

string str = "<div> <img src=\"https://i.testimg.com/images/g/test/s-l400.jpg\" style=\"width: 100%;\"> <div>Test</div> </div>";

// Get the index of where the value of src starts.
int start = str.IndexOf("<img src=\"") + 10;

// Get the substring that starts at start, and goes up to first \".
string src = str.Substring(start, str.IndexOf("\"", start) - start);

Answer 2

You can use RegularExpressions

Regex("<img\\s+src\\s*=\\s*\"(.*?)\"", RegexOptions.Multiline);

in results:
first group (index 0) - Full match
second group (index 1) - group 1 - (.*?) - link what you want

test regex online you can here

using System;
using System.Text.RegularExpressions;

public class Program
{
    public static void Main()
    {
        string src = "";
        Regex Pattern = new Regex("<img\\s+src\\s*=\\s*\"(.*?)\"", RegexOptions.Multiline);
        string str = "<div> <img src=\"https://i.testimg.com/images/g/test/s-l400.jpg\" style=\"width: 100%;\"> <div>Test</div> </div>";
        var res = Pattern.Match(str);
        if (res.Success)
        {
            src = res.Groups[1].Value;          
        }
        Console.WriteLine(src);
    }
}