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Call Web API Put And Post Using C#

The purpose of this article is to show you how to call put and post method of web API using C#.

Software Requirements

Visual studio 2012 or above.

Prerequisite Technical Knowledge

The reader should have good knowledge of .net framework, visual studio, web API and C#.
What are HTTP methods like get, put, post and what is the purpose of each method?

Create Web API Application

Create a web API application and inside the controller, add methods for post as well as put. See the following code segment.

using System.Web.Http; 
using System.IO; 
  
namespace SampleWebAPI.Controllers { 
    public class Employee { 
        public string Name { 
            get; 
            set; 
        } 
        public string EmployeeId { 
            get; 
            set; 
        } 
    } 
    public class PassParamController: ApiController { [HttpPost] 
        public void InsertData([FromBody] string data) { 
            File.WriteAllText(@"c:\temp\InsertData.txt", data); 
        } 
  
        [HttpPut] 
        public void InsertDataForEmployee([FromBody] Employee data) { 
            File.WriteAllText(@"c:\temp\InsertDataForEmployee.txt", string.Format("Name:{0}; EmployeeId: {1}", data.Name, data.EmployeeId)); 
        } 
    } 
}

In both post and put methods, I am creating a new file and write data in it. In the methods, we are passing a complex data type ‘Employee’. The parameter is decorated with FromBody (FromBody means we are passing request in a request body) attribute.

Create A Console Application

Now create a client application that calls web API. It could be a console application or a web application. But for this article, we will use console application.

In the console application, add the reference of following assemblies

System.Net.Http
System.Net.Http.Formatting

And on the file, add following namespaces

using System; 
using System.Net.Http;

To call the post method add following code in your main method.

Console.WriteLine("Please enter some text here:"); 
string data = Console.ReadLine(); 
  
HttpClient client = new HttpClient(); 
client.BaseAddress = new Uri("http://localhost:40003/"); 
var response = client.PostAsJsonAsync("api/PassParam", data).Result; 
if (response.IsSuccessStatusCode) { 
    Console.WriteLine("Web API called successfully"); 
} 
else   
    Console.WriteLine("There is some issue.");

Once you run the application, you see following output

Picture showing the output of calling the post method of web API using the console application

Click to Enlarge

For put, we use the following code in main method

Console.WriteLine("Please enter Name:"); 
string name = Console.ReadLine(); 
Console.WriteLine("Please enter EmployeeId:"); 
string employeeId = Console.ReadLine(); 
  
HttpClient client = new HttpClient(); 
client.BaseAddress = new Uri("http://localhost:40003/"); 
var response = client.PutAsJsonAsync("api/PassParam", new Employee() { 
    Name = name, 
    EmployeeId = employeeId 
}).Result; 
if (response.IsSuccessStatusCode) { 
    Console.WriteLine("Web API called successfully"); 
} 
else   
    Console.WriteLine("There is some issue.");

Now run the application and you see the following output

Picture showing the output of calling the put method of web API using the console application

Click to Enlarge

Posted By -	Karan Gupta

Posted On -	Friday, March 4, 2016

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