Azure app registration sharepoint online api c#

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https://www.c-sharpcorner.com/article/consume-sharepoint-online-csom-rest-api-with-dotnet-core-3-1/



To access SharePoint resources using Azure App Registration and SharePoint API in a C# application, you can follow these steps:

Step 1: Register your Application in Azure Portal

  1. Go to the Azure Portal (https://portal.azure.com/).
  2. Navigate to Azure Active Directory -> App registrations -> New registration.
  3. Provide a name and redirect URI for your application.
  4. Note down the Application (client) ID and Directory (tenant) ID.

Step 2: Set API Permissions

  1. In your registered application, go to "API permissions" -> "Add a permission" -> SharePoint -> "Delegated permissions" or "Application permissions".
  2. Choose the appropriate permissions according to your requirements.
  3. Click "Add permissions" and then "Grant admin consent for [your organization]".

Step 3: Get Client Secret

  1. In your registered application, go to "Certificates & secrets" -> "New client secret".
  2. Note down the generated client secret value. This is needed for authentication.

Step 4: Code Implementation

Here's an example of how you can use the Azure App Registration and SharePoint API in a C# application:

csharp
using Microsoft.Identity.Client;
using Microsoft.SharePoint.Client;
using System;

class Program
{
    static void Main(string[] args)
    {
        string clientId = "YOUR_CLIENT_ID";
        string clientSecret = "YOUR_CLIENT_SECRET";
        string tenantId = "YOUR_TENANT_ID";
        string siteUrl = "https://your-sharepoint-site-url";

        var confidentialClientApplication = ConfidentialClientApplicationBuilder.Create(clientId)
            .WithClientSecret(clientSecret)
            .WithAuthority(new Uri($"https://login.microsoftonline.com/{tenantId}"))
            .Build();

        var authResult = confidentialClientApplication.AcquireTokenForClient(new[] { "https://graph.microsoft.com/.default" })
            .ExecuteAsync().Result;

        using (var clientContext = new ClientContext(siteUrl))
        {
            clientContext.ExecutingWebRequest += (sender, e) =>
            {
                e.WebRequestExecutor.RequestHeaders["Authorization"] = "Bearer " + authResult.AccessToken;
            };

            // Now you can make SharePoint API calls using clientContext object
            // For example, retrieve a list items
            List list = clientContext.Web.Lists.GetByTitle("YourListName");
            CamlQuery query = CamlQuery.CreateAllItemsQuery();
            ListItemCollection items = list.GetItems(query);
            clientContext.Load(items);
            clientContext.ExecuteQuery();

            foreach (ListItem item in items)
            {
                Console.WriteLine(item["Title"]);
            }
        }
    }
}

In this example, replace "YOUR_CLIENT_ID", "YOUR_CLIENT_SECRET", "YOUR_TENANT_ID", and "https://your-sharepoint-site-url" with your actual client ID, client secret, tenant ID, and SharePoint site URL respectively.

Make sure to handle exceptions and errors properly in a production-ready application and consider implementing secure practices for managing secrets, such as using Azure Key Vault.

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