Authenticating Sharepoint site from background service and uploading file in C#

Authenticating Sharepoint site from background service and uploading file in C#

To authenticate with SharePoint site from a background service in C# and upload a file, you can use the Microsoft Graph API and the Microsoft Authentication Library (MSAL) for authentication. Here's an example of how to do it:

  1. Create an Azure AD application and grant it the necessary permissions to access SharePoint files.

  2. Install the following NuGet packages in your project: Microsoft.Graph, Microsoft.Graph.Auth, Microsoft.Identity.Client.

  3. Use the following code to authenticate with SharePoint and upload a file:

using System.IO;
using Microsoft.Graph;
using Microsoft.Graph.Auth;
using Microsoft.Identity.Client;

public async Task UploadFileToSharePoint(string siteUrl, string filePath, string fileName)
{
    // Configure authentication with Azure AD
    var tenantId = "YOUR_TENANT_ID";
    var clientId = "YOUR_CLIENT_ID";
    var clientSecret = "YOUR_CLIENT_SECRET";
    var authority = $"https://login.microsoftonline.com/{tenantId}";
    var confidentialClient = ConfidentialClientApplicationBuilder
        .Create(clientId)
        .WithClientSecret(clientSecret)
        .WithAuthority(new Uri(authority))
        .Build();
    var authProvider = new ClientCredentialProvider(confidentialClient);

    // Create a GraphServiceClient instance with the authentication provider
    var graphClient = new GraphServiceClient(authProvider);

    // Get the SharePoint site
    var site = await graphClient.Sites.GetByPath(siteUrl, "/").Request().GetAsync();

    // Get the root folder of the site
    var rootFolder = await graphClient.Sites[site.Id].Drive.Root.Request().GetAsync();

    // Upload the file to the root folder
    var fileStream = new FileStream(filePath, FileMode.Open);
    var uploadSession = await graphClient.Sites[site.Id].Drive.Root.ItemWithPath(fileName).CreateUploadSession().Request().PostAsync();
    var maxSizeChunk = 320 * 1024; // 320 KB - Change this to your chunk size
    var provider = new ChunkedUploadProvider(uploadSession, graphClient, fileStream, maxSizeChunk);
    var upload = await provider.UploadAsync();
    if (upload.UploadSucceeded)
    {
        Console.WriteLine("File uploaded successfully!");
    }
}

In this example, the UploadFileToSharePoint method takes the SharePoint site URL, the path of the file to upload, and the name of the file as input parameters. It first configures authentication with Azure AD using the MSAL library. It then creates a GraphServiceClient instance with the ClientCredentialProvider authentication provider.

The method then gets the SharePoint site and the root folder of the site using the Graph API. It opens the file using a FileStream and creates an upload session for the file using the Graph API. It then uses the ChunkedUploadProvider class to upload the file in chunks, with a maximum chunk size of 320 KB.

Finally, the method prints a message to the console indicating whether the file upload was successful.

Note that this is just an example, and you may need to modify it to fit your specific requirements.

Examples

  1. "Authenticate SharePoint site from background service C#"

    • Code Implementation:
      var authManager = new AuthenticationManager();
using (var ctx = authManager.GetAppOnlyAuthenticatedContext(siteUrl, clientId, clientSecret))
{
    // Your code here
}
    • Description: Demonstrates using the SharePoint PnP Core SDK and app-only authentication to authenticate a SharePoint site from a background service in C#.

  2. "Upload file to SharePoint using C# background service"

    • Code Implementation:
      using (var ctx = authManager.GetAppOnlyAuthenticatedContext(siteUrl, clientId, clientSecret))
{
    var library = ctx.Web.Lists.GetByTitle("Documents");
    var file = library.RootFolder.Files.Add(new FileCreationInformation
    {
        Content = System.IO.File.ReadAllBytes("FilePath"),
        Overwrite = true,
        Url = "FileName"
    });
    ctx.ExecuteQuery();
}
    • Description: Uploads a file to a SharePoint document library using C# in a background service with app-only authentication.

  3. "SharePoint CSOM authentication with client id and client secret C#"

    • Code Implementation:
      var authManager = new AuthenticationManager();
using (var ctx = authManager.GetAppOnlyAuthenticatedContext(siteUrl, clientId, clientSecret))
{
    // Your code here
}
    • Description: Uses the SharePoint CSOM (Client-Side Object Model) and app-only authentication to authenticate a SharePoint site using a client id and client secret.

  4. "C# background service SharePoint online authentication"

    • Code Implementation:
      var authManager = new AuthenticationManager();
using (var ctx = authManager.GetAzureADAppOnlyAuthenticatedContext(siteUrl, clientId, tenantId, clientSecret))
{
    // Your code here
}
    • Description: Authenticates a SharePoint Online site from a C# background service using Azure AD app-only authentication.

  5. "Upload large file to SharePoint using CSOM C#"

    • Code Implementation:
      using (var ctx = authManager.GetAppOnlyAuthenticatedContext(siteUrl, clientId, clientSecret))
{
    var library = ctx.Web.Lists.GetByTitle("Documents");
    var fileCreationInfo = new FileCreationInformation
    {
        ContentStream = new FileStream("FilePath", FileMode.Open),
        Overwrite = true,
        Url = "FileName"
    };
    var file = library.RootFolder.Files.Add(fileCreationInfo);
    ctx.ExecuteQuery();
}
    • Description: Uploads a large file to a SharePoint document library using CSOM in C# with app-only authentication.

  6. "SharePoint REST API authentication from C# background service"

    • Code Implementation:
      var authManager = new AuthenticationManager();
var accessToken = authManager.GetAppOnlyAccessToken(siteUrl, clientId, clientSecret);
// Use accessToken in REST API requests
    • Description: Obtains an access token and authenticates SharePoint REST API requests from a C# background service using app-only authentication.

  7. "C# SharePoint Online app-only authentication permissions"

    • Code Implementation:
      var authManager = new AuthenticationManager();
using (var ctx = authManager.GetAppOnlyAuthenticatedContext(siteUrl, clientId, clientSecret))
{
    var web = ctx.Web;
    ctx.Load(web, w => w.EffectiveBasePermissions);
    ctx.ExecuteQuery();
    // Check permissions and proceed
}
    • Description: Demonstrates checking app-only authentication permissions in a SharePoint Online site using C#.

  8. "SharePoint CSOM upload file with metadata C#"

    • Code Implementation:
      using (var ctx = authManager.GetAppOnlyAuthenticatedContext(siteUrl, clientId, clientSecret))
{
    var library = ctx.Web.Lists.GetByTitle("Documents");
    var fileCreationInfo = new FileCreationInformation
    {
        ContentStream = new FileStream("FilePath", FileMode.Open),
        Overwrite = true,
        Url = "FileName"
    };
    var file = library.RootFolder.Files.Add(fileCreationInfo);
    file.ListItemAllFields["Field"] = "Value";
    file.ListItemAllFields.Update();
    ctx.ExecuteQuery();
}
    • Description: Uploads a file to a SharePoint document library with metadata using CSOM in C# and app-only authentication.

  9. "SharePoint Online app-only authentication certificate C#"

    • Code Implementation:
      var authManager = new AuthenticationManager();
using (var ctx = authManager.GetAppOnlyAuthenticatedContext(siteUrl, clientId, certificate, thumbprint))
{
    // Your code here
}
    • Description: Shows how to perform app-only authentication in SharePoint Online using a certificate in C#.

  10. "C# SharePoint CSOM upload file to specific folder"

    • Code Implementation:
      using (var ctx = authManager.GetAppOnlyAuthenticatedContext(siteUrl, clientId, clientSecret))
{
    var library = ctx.Web.Lists.GetByTitle("Documents");
    var folder = library.RootFolder.Folders.GetByUrl("FolderName");
    ctx.Load(folder);
    ctx.ExecuteQuery();
    
    var fileCreationInfo = new FileCreationInformation
    {
        ContentStream = new FileStream("FilePath", FileMode.Open),
        Overwrite = true,
        Url = "FileName"
    };
    var file = folder.Files.Add(fileCreationInfo);
    ctx.ExecuteQuery();
}
    • Description: Uploads a file to a specific folder in a SharePoint document library using CSOM and app-only authentication in C#.

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