How to upload a file to SharePoint

Question

I'm trying to create a code to upload files to SharePoint. I've already attempted using Microsoft Graph and CSOM, but I haven't been successful. The closest I've gotten is with the code I shared here, but I'm receiving the following error:

'SharePoint Identity Client Runtime Library (IDCRL) did not get a response from the Login server.'

I would greatly appreciate a step-by-step guide on how to upload files and also read them using code. Can anyone help me? Thank you!

using (ClientContext context = new ClientContext(siteUrl))
{ 

  var securePassword = new SecureString();

  foreach (char c in password)
  {
      securePassword.AppendChar(c);
  }

  securePassword.MakeReadOnly();

  context.Credentials = new SharePointOnlineCredentials(email, securePassword);

  Web webContext = context.Web;

  Microsoft.SharePoint.Client.List documentLibrary = webContext.Lists.GetByTitle(driveId);

  FileCreationInformation newFile = new FileCreationInformation
  {
      ContentStream = new FileStream(filePath, FileMode.Open),
      Url = Path.GetFileName(filePath),
      Overwrite = true
  };

  Microsoft.SharePoint.Client.File uploadFile = documentLibrary.RootFolder.Files.Add(newFile);

  context.Load(uploadFile);

  context.ExecuteQuery();

  Console.WriteLine("Success: " + uploadFile.ServerRelativeUrl);

  }

Answer 1

1.PnP PowerShell

#Config Variables
$SiteURL = "https://tenant.sharepoint.com/sites/test"
$SourceFilePath ="C:\document.docx"
$DestinationPath = "Shared Documents" #Site Relative Path of the Library
 
#Connect to PnP Online
Connect-PnPOnline -Url $SiteURL -interactive
      
#powershell pnp to upload file to sharepoint online
Add-PnPFile -Path $SourceFilePath -Folder $DestinationPath

2.CSOM

    string userName = "******@xxxx.onmicrosoft.com";
    string password = "xxx";
    var securePassword = new SecureString();
    foreach (char c in password)
    {
        securePassword.AppendChar(c);
    }
    using (var clientContext = new ClientContext("https://tenant.sharepoint.com/sites/test"))
    {
        clientContext.Credentials = new SharePointOnlineCredentials(userName, securePassword);
        Web web = clientContext.Web;
        clientContext.Load(web, a => a.ServerRelativeUrl);
        clientContext.ExecuteQuery();
        List documentsList = clientContext.Web.Lists.GetByTitle("Shared Documents");

        var fileCreationInformation = new FileCreationInformation();
        //Assign to content byte[] i.e. documentStream

        fileCreationInformation.Content = System.IO.File.ReadAllBytes(@"C:\document.docx");
        //Allow owerwrite of document

        fileCreationInformation.Overwrite = true;
        //Upload URL

        fileCreationInformation.Url = "https://tenant.sharepoint.com/sites/test/" + "Shared Documents" + "/documents.docx
";

        Microsoft.SharePoint.Client.File uploadFile = documentsList.RootFolder.Files.Add(fileCreationInformation);

        //Update the metadata for a field having name "DocType"
        uploadFile.ListItemAllFields["Title"] = "UploadedviaCSOM";

        uploadFile.ListItemAllFields.Update();
        clientContext.ExecuteQuery();

    }

3.Graph

https://medium.com/@mitchelldalehein25/uploading-files-to-sharepoint-using-microsoft-graph-api-c-0edc689fb388

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