Upload heavy files to SharePoint Online - SharePoint REST API

Question

Upload heavy files to SharePoint Online - SharePoint REST API

Amit Singh Rawat 731

Hi All,

I have some large files in my environment, exceeding 1GB in size, and I'm attempting to upload them to a SharePoint online site using the C# SharePoint REST API. However, I'm encountering an error message that says, "Connection forcibly closed by host" when I try to upload these files. The code works well with files less than 150MB.

Below is the relevant code. Could someone please confirm how to achieve this successfully?

static async Task PutUploadLargeFileAsync(string accessToken, string filePath, string sharePointUrl, string libraryName)
        {
            using HttpClient client = new HttpClient();
            client.DefaultRequestHeaders.Add("Authorization", "Bearer " + accessToken);
            client.Timeout = TimeSpan.FromMinutes(20);

            var fileStream = new FileStream(filePath, FileMode.Open);
            var fileName = Path.GetFileName(filePath);

            var requestUri = $"{sharePointUrl}/_api/web/lists/getbytitle('{libraryName}')/RootFolder/Files/Add(url='{fileName}', overwrite=true)";

            var response = await client.PutAsync(requestUri, new StreamContent(fileStream));

            if (response.IsSuccessStatusCode)
            {
                Console.WriteLine("File uploaded successfully.");
            }
            else
            {
                Console.WriteLine($"File upload failed. Status code: {response.StatusCode}");
            }
        }

1 answer

Your answer

Answer 1

Anonymous

Hi @ASR

You need to split the file in smaller parts see the example here:

https://social.msdn.microsoft.com/Forums/en-US/191424a8-e94e-4512-b3db-f53fea7463e5/how-to-upload-a-big-file-in-mvc?forum=aspmvc

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Best Regards

Cheng Feng

Amit Singh Rawat 731 Reputation points

2023-09-14T08:05:44.5533333+00:00

I want to upload a file to SharePoint Online using the SharePoint REST API, not to an MVC or Windows server. I am not sure if this will work with SharePoint.

Anonymous

Hi @ASR，

Sorry, I misunderstood you. Please refer to the code below:

public static void UploadRest(string siteUrl, string libraryName, string filePath)
{
             byte[] binary = IO.File.ReadAllBytes(filePath); ;
             string fname = IO.Path.GetFileName(filePath);
             string result = string.Empty;
             string resourceUrl = siteUrl + "/_api/web/lists/getbytitle('" + libraryName + "')/rootfolder/files/add(url='" + fname + "',overwrite=true)";
 
             HttpWebRequest wreq = HttpWebRequest.Create(resourceUrl) as HttpWebRequest;
             wreq.UseDefaultCredentials = false;
             SharePointOnlineCredentials credentials = Utils.GetO365Credentials("your login", "your password");
             wreq.Credentials = credentials;
             wreq.CookieContainer = Utils.GetO365CookieContainer(credentials, siteUrl);
 
             string formDigest = GetFormDigest(siteUrl, credentials, wreq.CookieContainer);
             wreq.Headers.Add("X-RequestDigest", formDigest);
             wreq.Method = "POST";
             wreq.Timeout = 1000000;
             wreq.Accept = "application/json; odata=verbose";
             wreq.ContentLength = binary.Length;
            
 
             using (IO.Stream requestStream = wreq.GetRequestStream())
             {            
                 requestStream.Write(binary, 0, binary.Length);
             }
 
             WebResponse wresp = wreq.GetResponse();
             using (IO.StreamReader sr = new IO.StreamReader(wresp.GetResponseStream()))
             {
                 result = sr.ReadToEnd();
             }
 
 
}
public static string GetFormDigest(string siteUrl, ICredentials credentials, CookieContainer cc)
{
            string  formDigest = null;
 
            string resourceUrl = siteUrl +"/_api/contextinfo";
            HttpWebRequest wreq = HttpWebRequest.Create(resourceUrl) as HttpWebRequest;
 
            wreq.Credentials = credentials;
            wreq.CookieContainer = cc;
            wreq.Method = "POST";
            wreq.Accept = "application/json;odata=verbose";
            wreq.ContentLength = 0;
            wreq.ContentType = "application/json";
            string result;
            WebResponse wresp = wreq.GetResponse();
        
            using (IO.StreamReader sr = new IO.StreamReader(wresp.GetResponseStream()))
            {
                result = sr.ReadToEnd();
            }
 
            var jss = new JavaScriptSerializer();
            var val = jss.Deserialize<dictionary><string ,object="">>(result);
            var d = val["d"] as Dictionary<string object="" ,="">;
            var wi = d["GetContextWebInformation"] as Dictionary<string object="" ,="">;
            formDigest = wi["FormDigestValue"].ToString();
 
            return formDigest;
            
}

Here is link for you reference:

http://sharepointfieldnotes.blogspot.com/2014/07/uploading-large-documents-into.html

However, I recommend using the graph api to upload large files.

https://stackoverflow.com/questions/49776955/how-to-upload-a-large-document-in-c-sharp-using-the-microsoft-graph-api-rest-cal

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Best Regards

Cheng Feng

Amit Singh Rawat 731 Reputation points

2023-09-18T10:10:23.5266667+00:00

I am using .NET6 and looks like "ICredentials " is not a recommended approach or not available to .NET6. I have access token. Can you we access token approach.

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Upload heavy files to SharePoint Online - SharePoint REST API

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