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How to upload to OneDrive using Microsoft Graph Api in c#

I have been trying to upload to a OneDrive account and I am hopelessly stuck not being able to upload neither less or greater than 4MB files. I have no issues accessing the drive at all, since I have working functions that create a folder, rename files/folders, and a delete files/folders.
https://learn.microsoft.com/en-us/graph/api/driveitem-put-content?view=graph-rest-1.0&tabs=csharp
This documentation on Microsoft Graph API is very friendly to HTTP code, and I believe I am able to fairly "translate" the documentation to C#, but still fail to grab a file and upload to OneDrive. Some places online seem to be using byte arrays? Which I am completely unfamiliar with since my primary language is C++ and we just use ifstream/ofstream. Anyways, here is the portion of code in specific (I hope this is enough):
var item = await _client.Users[userID].Drive.Items[FolderID]//"01YZM7SMVOQ7YVNBXPZFFKNQAU5OB3XA3K"].Content
.ItemWithPath("LessThan4MB.txt")//"D:\\LessThan4MB.txt")
.CreateUploadSession()
.Request()
.PostAsync();
Console.WriteLine("done printing");
As it stands, it uploads a temporary file that has a tilde "~" in the OneDrive (like as if I was only able to open but not import any data from the file onto it). If I swap the name of the file so it includes the file location it throws an error:
Message: Found a function 'microsoft.graph.createUploadSession' on an open property. Functions on open properties are not supported.

Try this approach with memory stream and PutAsync<DriveItem> request:
string path = "D:\\LessThan4MB.txt";
byte[] data = System.IO.File.ReadAllBytes(path);
using (Stream stream = new MemoryStream(data))
{
var item = await _client.Me.Drive.Items[FolderID]
.ItemWithPath("LessThan4MB.txt")
.Content
.Request()
.PutAsync<DriveItem>(stream);
}
I am assuming you have already granted Microsoft Graph Files.ReadWrite.All permission. Check your API permission. I tested this code snippet with pretty old Microsoft.Graph library version 1.21.0. Hopefully it will work for you too.

Read an Excel (xlsx) file on OneDrive using C# & ASP.NET MVC

I have a OneDrive shared link for an excel file with some data. And I need to read this excel file through my C# ASP.NET MVC web application without downloading it to local PC. But I'm new to this 'OneDrive API'. So I have a serious challenge with this. I'm familiar with local file read as in,
EX:
var package = new ExcelPackage(new System.IO.FileInfo(PATH));
I'd really appreciate if anyone can guide me or provide a sample code to do this. I just need to access the ExcelPackage of the .xlsx file. Thank you in advance.
PS : I have tried some options like 'WebRequest', 'Webclient', etc. :(

You could try something like HttpClient.GetStreamAsync to open a download stream for the remote file and then pass the returned Stream to the ExcelPackage constructor (documentation states it has a constructor that accepts an instance of a Stream).
Hope it helps!

Get onedrive file URL from a the locally cached file

I am looking for a way to derive the OneDrive file URL for a file cached to my local OneDrive folder? The only thing I can think of is hardcoding some root URLS for each of the OneDrive folders I have, but this seems nasty!
Does anyone know of any OneDrive client API that lets query a URL based on the local file path?
My use case:
I am trying to attach to and open instance of an Excel workbook. I used to be able to do this Marshal.BindToMoniker(_workbookPath);
However it appears that Excel is now registering the OneDrive URL in the ROT rather than the local file path. This this happened with the update that brought the new auto-save feature to Excel 2016 I think, that seems to be about the time my existing code broke.
There is a similar unanswered question here: C# OneDrive for Business / SharePoint: get server path from locally synced file

Might want to use the following key instead:
HKEY_CURRENT_USER\Software\SyncEngines\Providers\OneDrive
This includes the following registry values:
UrlNamespace: (SharePoint site URL)
MountPoint: (local driver location)
It does appear to include old values which are no longer synced - but it shouldn't be too hard to check against
HKEY_CURRENT_USER\Software\Microsoft\OneDrive\Accounts\Business1\ScopeIdToMountPointPathCache
or
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\SyncRootManager
for paths that are being actively synced.

I am also looking at a solution for getting the SharePoint url to a file in OneDrive Synced File Explorer.
I have noticed you get under C:\Users%username%\AppData\Local\Microsoft\OneDrive\settings\Business1{GUID}.ini a mapping between your OneDrive synced folder and the SharePoint GUID
Example:
libraryScope = 1 630c2a866d9c458b81060eff107887ed+1 5 "GUIDEs" "Documents" 4 "https://mytenant.sharepoint.com/teams/team_10000035" "8d4b558f-7b2e-40ba-ad1f-e04d79e6265a" e0266a43caf347238f684bab486f4e51 e0d25dcb1a014f5f86d787984f6327c2 4f86b3e3e54e42e0bb0f7a58eadf0335 0 "" 0 4cde5c00-3fe3-4162-b831-d8ef440e1593 libraryFolder = 0 1 8bbfe07dfeff41cea7ab5da4a554592a+1 1558084235 "D:\DSUsers\uid41890\TenantName\GUIDEs - General" 2 "General" bd0c1b7c-2a1f-4492-8b1b-8e152c9e0c26
You also have this mapping in the registry Computer\HKEY_CURRENT_USER\Software\Microsoft\OneDrive\Accounts\Business1\ScopeIdToMountPointPathCache
From the GUID you could get the path using SPWeb.GetFile(Guid)
If you can make a standalone function given a local OneDrive file path that returns the SharePoint url, I would greatly appreciate you share your solution here.

I have implemented a solution in AutoHotkey see documentation here
It is based on #GWD idea (see comments below) to generate a temporary excel file with the formula CELL("filename") at each sync locations to extract this mapping information to a text file that is then later parsed to do the reverse mapping from local file to SharePoint url.

Asp.Net C# Getting Full Path of a File

I am building a web application using WCF. I need to full path of a file to open and upload it to web service.
What I am doing is first opening a file by its full path, then take stream of it and finally upload it to service. My code is below
string Path = Server.MapPath( FileUpload1.PostedFile.FileName);
System.IO.Stream fileStream = File.OpenRead(#Path);
I can't get full path of the file for security reasons.
How can I read the file that users select?

Server.MapPath(FileUpload1.FileName) is the path to a file on the server. You cannot get the full path of the client machine of the file Using the FileUpload.

There is no need for the full client path to access it. You can use the FileBytes
property in order to read the contents of uploaded file.

As others have already suggested there's no reason you need the file path to the client in order to save a file on your server. In the case you need some clearer explanation for this, then please refer to these answers:
https://stackoverflow.com/a/3077008/2196675
https://stackoverflow.com/a/1130718/2196675

Getting the full file path when using a file upload control

I wrote some code to upload files to amazon S3, if I put a full file path manually It successfully uploads the file from my computer. What I'm trying to do is use a file upload control and store the full path in a variable so that I can use it for my amazon method. Ive read everywhere it seems that the browser won't let you get the full file path for security reasons.
How can I get the full file path? Should I just store the files on my webserver and point my amazon method to the server path, and then use the file upload control to tell it what the filename is? I wish I could just do a straight shot to amazon...

First we have to save the file path and then we take it from
string filepath=Path.GetFullPath(UploadFile1.FileName.toString());

I came across this link which has a great tutorial and even gives you a working sample project. (this is different from the code that the .net SDK includes...) http://aws.amazon.com/articles/774?_encoding=UTF8&jiveRedirect=1

We can't take full path in HTML or JS as it violets security so whenever you try to see the path it shows fakepath
so to resolve this issue you can make a seprate folder and you can store the uploaded file there and in the code you can take that folders path as default and use it as a absolute path.
You can get the full path using Python Tkinter but it is limited for desktop app.