Wednesday 18 October 2023

Making API POST Requests with JSON and Authentication Token using C# Class Library as reference in D365FO

 In today's interconnected world, integrating with external APIs is a common requirement for many software projects. Whether you're building a web application, mobile app, or any other software that needs to communicate with external services, understanding how to make API POST requests with JSON data and authentication tokens in a C# class library can be incredibly valuable. In this blog post, we'll walk you through the process of creating a C# class library that can be used as a reference for making such requests.

Step 1: Create a C# Class Library Project

To create a C# class library project in Visual Studio that compiles into a .dll (Dynamic-Link Library) file, you can follow these steps:

1. Open Visual Studio:

If you don't have Visual Studio installed, you can download the Community edition for free from the official Microsoft website.

2. Create a New Project:

Go to "File" > "New" > "Project..."

In the "Create a new project" window, search for "Class Library" or "Class Library (.NET Core)" depending on the version of .NET you want to target.

Select the appropriate project template and click "Next."

Add the below C# code:

-----------------------------------------------------------------------------------------------------------------------

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Net.Http;

using System.Net.Http.Headers;


namespace CSharpAPIClassLibrary

{

    public class AXApiService

    {

        private readonly HttpClient httpClient;

        public AXApiService(string baseUri)

        {

            httpClient = new HttpClient { BaseAddress = new Uri(baseUri) };

        }

        public async Task<string> PostDataAsync(string endpoint, string jsonContent, string authToken)

        {

            try

            {

                httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", authToken);

                httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                var content = new StringContent(jsonContent, Encoding.UTF8, "application/json");

                HttpResponseMessage response = await httpClient.PostAsync(endpoint, content);

                if (response.IsSuccessStatusCode)

                {

                    return await response.Content.ReadAsStringAsync();

                }

                throw new Exception($"API request failed with status code {response.StatusCode}");

            }

            catch (Exception ex)

            {

                throw new Exception($"API request failed: {ex.Message}");

            }

        }

    }

}

-------------------------------------------------------------------------------------------------------------------------

3. Build the Project:

        a)Build your class library project by clicking "Build" > "Build Solution" or using the keyboard shortcut (usually F6).
        b)This action will compile your code into a .dll file.

4. Locate the .dll File:

        a)The compiled .dll file can be found in the "bin" folder of your project. By default, it's in a subfolder named after your target framework (e.g., "bin\Debug\netstandard2.0" for a .NET Standard 2.0 project).
Your C# class library is now compiled into a .dll file and is ready to be used in other projects or applications. You can reference this .dll in other C# projects, such as console applications, Windows Forms applications, ASP.NET applications, or any other .NET application type.

Note: 

This ApiClient class allows you to set the base URL, make POST requests with JSON payloads, and include an authentication token in the headers.

Step 2: Use the API Client in Your Application

    a)To use this library in an Application Object Tree (AOT) project, add a reference to your class library by right-clicking on the AOT project, selecting "Add Reference," and then browsing for your class library's DLL file in the bin/Debug (or bin/Release) folder of your class library project.

    b)In your AOT project, you can now use the ApiService class to make API calls with the desired content type and authorization token.

Here's an example of how you can use this class in your AOT project:

using CSharpAPIClassLibrary;
internal final class CallCshrpLibAPIPostEmp
{
    /// <summary>
    /// Class entry point. The system will call this method when a designated menu 
    /// is selected or when execution starts and this class is set as the startup class.
    /// </summary>
    /// <param name = "_args">The specified arguments.</param>
    public static void main(Args _args)
    {
        var axApiService = new AXApiService("https://api.example.com"); // Base URL
        str endpoint = "/api/resource"; //endPoint POST URL       
        str jsonContent = "{ \"key\": \"value\" }";
        str authToken = = "your-auth-token";

        try
        {
            str response = axApiService.PostDataAsync(endpoint, jsonContent, authToken).Result;
            info("API response: " + response);
        }
        catch (Exception::Error)
        {
            // Handle exceptions that may occur during the request
            error("An error occurred during the HTTP request.");
        }
    }

}


You've now created a C# class library that can be used as a reference for making API POST requests with JSON data and authentication tokens. This library can be reused in various C# applications, making it easier to integrate with external APIs securely and efficiently.

Remember to handle errors and edge cases according to your application's specific requirements and consult the API's documentation for any additional details. Happy coding! ---Mallik

Tuesday 17 October 2023

Calling APIs from D365 Using Content Type Text "application/x-www-form-urlencoded" POST request

 

In the world of enterprise resource planning (ERP), Microsoft Dynamics 365 (D365) stands out as a powerful and versatile solution. To unlock the full potential of D365, you often need to integrate it with other systems or automate certain processes. One common way to achieve this is by calling D365 APIs. In this blog post, we'll walk you through the process of calling D365 APIs using the "application/x-www-form-urlencoded" content type.

Understanding the "application/x-www-form-urlencoded" Content Type

Before we dive into calling D365 APIs, let's first understand what the "application/x-www-form-urlencoded" content type is. This content type is commonly used for sending data to web servers, especially when dealing with HTML forms. It represents key-value pairs in the URL-encoded format, where data is sent as a series of name-value pairs separated by the '&' character.

Prerequisites

To start calling D365 APIs, you'll need the following prerequisites:

1. Microsoft Dynamics 365 Account: You should have access to a D365 instance and the required permissions to call APIs.

2. API Endpoint: You should know the API endpoint you want to call. Consult D365's API documentation to find the specific endpoint URL.

3. API Key or Authentication Token: Depending on your D365 instance's security settings, you might need an API key or an authentication token.

Calling D365 APIs with "application/x-www-form-urlencoded" Content Type

Now, let's walk through the steps to call a D365 API using the "application/x-www-form-urlencoded" content type:

Step 1: Assemble Your Data

Prepare the data you want to send in the request in the "application/x-www-form-urlencoded" format. This means you need to create a string that contains key-value pairs separated by '&' and encode them properly.

Step 2: Set Up Your HTTP Request below is the sample code 

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.JsonSerializer;

using System.Text.Json;

using System.IO.FileAccess;

using System.IO.Directory;

using System.IO;

using Newtonsoft.Json.Linq.JObject;

using System.Net.Http.HttpClient;

using System.Net.Http.HttpRequestMessage ;

using System.Net.Http.HttpResponseMessage;

internal final class AuthenticationRunnableClass

{

    /// <summary>

    /// Class entry point. The system will call this method when a designated menu 

    /// is selected or when execution starts and this class is set as the startup class.

    /// </summary>

    /// <param name = "_args">The specified arguments.</param>

    public static void main(Args _args)

    {

        System.Net.Http.HttpClient clientlocal;

        System.Net.Http.HttpRequestMessage requestlocal;

        System.Net.Http.HttpResponseMessage responselocal;

        System.Text.Encoding encoding;

        try

        {

            // Create an instance of the HttpClient

            clientlocal = new System.Net.Http.HttpClient();

            // Define the request URL

            str requestUrl = 'https://your-d365-api-endpoint.com';

    // Create the content in application/x-www-form-urlencoded format

            str formData = 'client_id=xx-xxxx&client_secret=xxxxx&grant_type=client_credentials&scope=alf.scope.integration.api&acr_values=tenant:xxxx'; // Replace with your form data //This is the text which is used to send with URL

            encoding = System.Text.Encoding::UTF8;

            // Create the content as StringContent

            System.Net.Http.StringContent content = new System.Net.Http.StringContent(formData, encoding, 'application/x-www-form-urlencoded');

            // Send the POST request with the form data

            responselocal = clientlocal.postAsync(requestUrl, content).Result;

            // Handle the response as needed

            int statusCode = any2Int(responselocal.get_StatusCode());

            str responseContent = responselocal.get_Content().readAsStringAsync().Result;

            // Handle the response data and potential errors

            if (statusCode == 200)

            {

                // Request was successful; process the response content

                info(responseContent);

            }

            else

            {

                // Handle the response based on the status code (e.g., log an error)

                error("HTTP request failed with status code: " + int2str(statusCode));

            }

        }

        catch (Exception::Error)

        {

            // Handle exceptions that may occur during the request

            error("An error occurred during the HTTP request.");

        }

    }

}

Step 3: Handle the Response

Once you send the request, you can handle the response from the D365 API. Be sure to check the status code and parse the response data accordingly. The code below show how to handle the response 

// Handle the response data and potential errors

            if (statusCode == 200)

            {

                // Request was successful; process the response content

                info(responseContent);

            }

            else

            {

                // Handle the response based on the status code (e.g., log an error)

                error("HTTP request failed with status code: " + int2str(statusCode));

            }


Conclusion

Calling D365 APIs using the "application/x-www-form-urlencoded" content type is a common way to integrate D365 with other systems or automate processes. Understanding the format and following the steps outlined in this blog post can help you make successful API requests and leverage the full power of Microsoft Dynamics 365. Make sure to refer to D365's API documentation for the specific endpoints and data you need to interact with in your integration projects.






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