Unable to use file read with server-side preview6

[tmarkovski]

Describe the bug
Can't use the file reader component with server side Blazor. The signalr connection fails. On the backend side, the code just hangs when attempting to read from the stream at await stream.ReadAsync
Due to other dependencies with the project, I'm unable to use net 3.0 preview7 at this time.

To Reproduce
Steps to reproduce the behavior:
Pretty much using the suggested code to reproduce this.

public async Task<string> GetImagePathAsync()
{
    foreach (var file in await FileService.CreateReference(FileElement).EnumerateFilesAsync())
    {
        var fileInfo = await file.ReadFileInfoAsync();
        using var stream = await file.OpenReadAsync();
        var imageData = new byte[stream.Length];
        await stream.ReadAsync(imageData, 0, (int)stream.Length);

        using var imageStream = new MemoryStream(imageData);
        return await Client.UploadImageAsync(imageStream, fileInfo.Name, fileInfo.Type);
    }
    return null;
}

Project type
Server-side

Environment

• Browser: Safari, Firefox and Chrome
• Version of Blazor.FileReader - 0.12.19186
• Version of .net sdk - 3.0.100-preview6-012264

[tmarkovski]

Closing this, as I figured it out. The issue was the buffer size limit of 4096 when reading the stream. Working code below in case anyone runs into again.

public async Task<string> GetImagePathAsync()
{
    foreach (var file in await FileService.CreateReference(FileElement).EnumerateFilesAsync())
    {
        using var stream = await file.OpenReadAsync();
        var fileInfo = await file.ReadFileInfoAsync();
        var imageData = new byte[stream.Length];

        int count;
        var buffer = new byte[4096];
        while ((count = await stream.ReadAsync(buffer, 0, buffer.Length)) != 0)
        {
            Array.Copy(buffer, 0, imageData, stream.Position - count, count);
        }

        using var imageStream = new MemoryStream(imageData);
        return await Client.UploadImageAsync(imageStream, fileInfo.Name);
    }
    return null;
}

[Tewr]

@tmarkovski great that you found a solution.

However, I think your code is equivalent to just calling
var imageStream = await file.CreateMemoryStreamAsync(4096);

In preview 7, using the solutions posted here, should work, but if you're stuck in preview6 solutions above will have to do.

[tmarkovski]

I was not aware of that method. Thank you!