How to Parse an example string in C# [duplicate]

Question

I have this string

[
    {
        "url_short":"http:\/\/sample.com\/8jyKHv",
        "url_long":"http:\/\/www.sample.com\/",
        "type":0
    }
]

What I want is to get http:\/\/sample.com\/8jyKHv and translate it to

http://sample.com/8jyKHv

Is it possible?

You have 2 options here. Either you treat this as a string and use substring and replace. Either you treat this as a JSON and do a deserialize into a class object. Both will yield to the desired result — Dieter B
– Dieter B, Commented Jul 27, 2016 at 8:11
See stackoverflow.com/questions/11260631/… for the JSON deserialize method -- Which I recommend over the substring solution — Dieter B
– Dieter B, Commented Jul 27, 2016 at 8:12
Yeah, strongly recommend the JSON way, not the string/substring/replace method. — Gil Sand
– Gil Sand, Commented Jul 27, 2016 at 8:33

BWA · Accepted Answer · 2016-07-27 10:05:37Z

4

This string is JSON.

You can parse it by using JSON.NET.

Example:

using System;
using System.Collections.Generic;
using Newtonsoft.Json;

public class RootObject
{
    public string url_short { get; set; }
    public string url_long { get; set; }
    public int type { get; set; }
}

public class Program
{
    static public void Main()
    {
        string j = "[{\"url_short\":\"http:\\/\\/sample.com\\/8jyKHv\",\"url_long\":\"http:\\/\\/www.sample.com\\/\",\"type\":0}]";

        List<RootObject> ro = JsonConvert.DeserializeObject<List<RootObject>>(j);

        Console.WriteLine(ro[0].url_short);                 
    }    
}

Response:

http://sample.com/8jyKHv

edited Jul 27, 2016 at 10:05

answered Jul 27, 2016 at 8:15

BWA

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Comments

Shakir Ahamed · Accepted Answer · 2016-07-27 08:52:04Z

Try this

Create a class like below

Note : you can use Paste Special option in visual studio to generate all the classes related to the JSON

Edit -> Paste Special -> Paste Json As Classes

it will create all the classes related to the JSON

    public class url_details
    {
        public string url_short { get; set; }
        public string url_long { get; set; }
        public int type { get; set; }
    }


    public List<url_details> json_deserialized()
    {
        string json = "[{\"url_short\":\"http:\\/\\/sample.com\\/8jyKHv\",\"url_long\":\"http:\\/\\/www.sample.com\\/\",\"type\":0}]";

        List<url_details> items = new List<url_details>();
        items = JsonConvert.DeserializeObject<List<url_details>>(json);

        return items;
    }

And you can access the element like below

   List<url_details> obj = json_deserialized();

   string url_short = obj[0].url_short;

C4d · Accepted Answer · 2016-07-27 08:14:51Z

2

The JSON way is for sure recommended, but cant tell much about it. Here's the alternative way with regex:

Regex rgxUrl = new Regex("\"url_short\":\"(.*?)\",\"");
Match mUrl = rgxUrl.Match(yourString);

string url = Regex.Replace(mUrl.Groups[1].Value, @"\", "");

answered Jul 27, 2016 at 8:14

C4d

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2 Comments

ajbee Over a year ago

must be Regex.Replace(mUrl.Groups[1].Value, @"\\", "");

C4d Over a year ago

@AJB nope. @ is already escapting the string. Either "\\" or @"\".

Mohit S · Accepted Answer · 2016-07-27 09:43:08Z

2

The string is a JSON string so you can create a class to get the values like this

public class Rootobject
{
    public Class1[] Property1
    {
        get;
        set;
    }
}

public class Class1
{
    public string url_short
    {
        get;
        set;
    }
    public string url_long
    {
        get;
        set;
    }
    public int type
    {
        get;
        set;
    }
}

After this class you can get the data like this

string json = "[{"url_short":"http:\/\/sample.com\/8jyKHv","url_long":"http:\/\/www.sample.com\/","type":0}]";
List<Rootobject> ro = JsonConvert.DeserializeObject<List<Rootobject>>(json);
string ururl = ro[0].Propert1[0].url_short;

edited Jul 27, 2016 at 9:43

answered Jul 27, 2016 at 8:14

Mohit S

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2 Comments

Sir Rufo Over a year ago

Removal of \ is obsolete because after deserialization it has gone. Your json sample string is wrong (missing the "\"). See json.org for specs

Sir Rufo Over a year ago

One error left: The json contains an array of objects ;o)

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