How to check a specific string contains in the Json object in core api

Sujeet Raman

I have a function which will check given project name is include in the json object. For that I am not getting a proper json object in my response how to do that?

this is my object

{"projects":[{"name":"projects/sTest"},{"name":"projects/A345"},{"name":"projects/off"},{"name":"projects/dds"}]

i have one main method which will call public bool CheckDuplicate(string name) method to return whether any same name inside the object or not.

public async Task<string> UploadData(string name, string url)
{
var hasMatch = CheckDuplicate(name);
//post project_name methode here which will happen only hasmatch is false.need to block same names
}
public bool CheckDuplicate(string name)
{
string pname = name.Substring(9, name.Length - 9);
HttpClient client = new HttpClient();
client.BaseAddress = new Uri(httpRequest);
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
HttpResponseMessage response = client.GetAsync(httpRequest).Result;
var result = response.Content.ReadAsStringAsync().Result;
in result i am getting my objects like
{"projects":[{"name":"projects/sTest"},{"name":"projects/A345"},{"name":"projects/off"},{"name":"projects/dds"}]
var JSONObj = JsonConvert.DeserializeObject(result);
// i am getting values in JSONObj but below code is not working
//cant check the given pname is there or not
var hasMatch = false;
for (var index = 0; index < JSONObj.length; ++index)
{
var Projects = JSONObj[index];
if (Projects.name == pname)
{
hasMatch = true;
}
else
{
hasMatch = false;
}
}
return hasMatch;
}

10 Replies

Know the answer? Post it — somebody with the same question will find it here.

Varun Setia5y ago
Accepted answer
This condition returns a boolean result
hasMatch = data.projects.Where(c => c.name == pname).Count() > 0;//if count >0 i.e. project exists then true else false
return hasMatch;
Sujeet Raman5y ago
and if i have to throw a simple error message to postman how i can give that message ?

instead of this any json method is available?

else
{
var message = "Project Name Already exist!";
return message;
}
Sachin Singh5y ago
you don't need to use count. simply use Any().
step 1. Design your class (if you haven't already)
public class Project
{
    public string name { get; set; }
}

public class Root
{
    public List projects { get; set; }
}
step 2. deserialize it
Root myDeserializeddata = JsonConvert.DeserializeObject(myJsonResponse);
step 3. use Any() extension method (which will return true/false)
return myDeserializeddata.Any(x=>x.name==pname);
note:- make sure your method return type is bool if you want to return true/false.
Sujeet Raman5y ago
how i will return boolean?below code i, not getting

var hasMatch = false;

var data = JsonConvert.DeserializeObject(result);

hasMatch = data.projects.Where(c => c.name == pname).Count() > 0;

if (hasMatch)

{

return hasMatch;

}

else { return hasMatch; }

}
Sujeet Raman5y ago
i am getting projects.so we need to give an if condition to hasmatch true?
Varun Setia5y ago
Your poco classes seems fine.
You can use them like this in logic.

var data = JsonConvert.DeserializeObject(result);
hasMatch = data.projects.Where(c => c.name == pname).Count() > 0;

Except, i cannot find use of nextPageToken, but you can keep that.
Sujeet Raman5y ago
that poco class how i can rewrie? currently i have

using System;
using System.Collections.Generic;
using System.Text;
namespace testdata
{
public class ResultGetProjects
{
public class Project
{
public string name { get; set; }
}
public List projects { get; set; }
public string nextPageToken { get; set; }
}
}
Varun Setia5y ago
Like this, will this help ?
public bool CheckDuplicate(string name)
{
string pname = name.Substring(9, name.Length - 9);
HttpClient client = new HttpClient();
client.BaseAddress = new Uri(httpRequest);
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
HttpResponseMessage response = client.GetAsync(httpRequest).Result;
var result = response.Content.ReadAsStringAsync().Result;

in result i am getting my objects like

{"projects":[{"name":"projects/sTest"},{"name":"projects/A345"},{"name":"projects/off"},{"name":"projects/dds"}]
var JSONObj = JsonConvert.DeserializeObject(result);
// i am getting values in JSONObj but below code is not working
//cant check the given pname is there or not
var hasMatch = false;
var data = JsonConvert.DeserializeObject(result);
hasMatch = data.projects.Where(c => c.name == pname).Count() > 0;
return hasMatch;
}
Sujeet Raman5y ago
couldnt get your point
Varun Setia5y ago
//POCO Classes
public class Project
{
public string name { get; set; }
}
public class Projects
{
public List projects { get; set; }
}
}

//Comparison
var data = JsonConvert.DeserializeObject(result);
hasMatch = data.projects.Where(c => c.name == pname).Count() > 0;