Blazor Server: Creating email attachments from files uploaded via InputFile - blazor-server-side

Question

I am trying to send emails with attachments attached to the email. I have a InputFile with a progress bar that I am able to upload files. I have attempted to use the memory stream to make attachments to the MailMessage class. The issue is that when the email is received, I am able to see the attachments but I can't read or view the contents of the attachments. I've posted my code below so you can replicate the issue that I am having (Make sure to install the Meziantou.Framework.ByteSize nuget package)
#using System.Net.Mail
#using System.Globalization
#using Meziantou.Framework
<InputFile OnChange="e => LoadFiles(e)" multiple></InputFile>
#foreach (var file in uploadedFiles)
{
<div>
#file.FileName
<progress value="#file.UploadedBytes" max="#file.Size"></progress>
#file.UploadedPercentage.ToString("F1")%
(#FormatBytes(file.UploadedBytes) / #FormatBytes(file.Size))
</div>
}
<button type="button" #onclick="#HandleNotifSubmit" class="btn btn-primary submit">Send Email</button>
#code {
private MemoryStream fileContents { get; set; }
List<FileUploadProgress> uploadedFiles = new();
MailMessage message = new MailMessage();
StreamWriter writer { get; set; }
private async ValueTask LoadFiles(InputFileChangeEventArgs e)
{
var files = e.GetMultipleFiles(maximumFileCount: 100);
var startIndex = uploadedFiles.Count;
// Add all files to the UI
foreach (var file in files)
{
var progress = new FileUploadProgress(file.Name, file.Size);
uploadedFiles.Add(progress);
}
// We don't want to refresh the UI too frequently,
// So, we use a timer to update the UI every few hundred milliseconds
await using var timer = new Timer(_ => InvokeAsync(() => StateHasChanged()));
timer.Change(TimeSpan.FromMilliseconds(500), TimeSpan.FromMilliseconds(500));
// Upload files
byte[] buffer = System.Buffers.ArrayPool<byte>.Shared.Rent(4096);
try
{
foreach (var file in files)
{
using var stream = file.OpenReadStream(maxAllowedSize: 10 * 1024 * 1024);
while (await stream.ReadAsync(buffer) is int read && read > 0)
{
uploadedFiles[startIndex].UploadedBytes += read;
var readData = buffer.AsMemory().Slice(0, read);
}
fileContents = new MemoryStream(buffer);
writer = new StreamWriter(fileContents);
fileContents.Position = 0;
message.Attachments.Add(new Attachment(fileContents, file.Name));
startIndex++;
}
}
finally
{
System.Buffers.ArrayPool<byte>.Shared.Return(buffer);
StateHasChanged();
}
}
string FormatBytes(long value)
=> ByteSize.FromBytes(value).ToString("fi2", CultureInfo.CurrentCulture);
record FileUploadProgress(string FileName, long Size)
{
public long UploadedBytes { get; set; }
public double UploadedPercentage => (double)UploadedBytes / (double)Size * 100d;
}
private async void HandleNotifSubmit()
{
try
{
var sClient = new SmtpClient("FAKECOMPANYCLIENT");
sClient.Port = 25;
sClient.UseDefaultCredentials = false;
message.Subject = "Hello World";
message.From = new MailAddress("test#gmail.com");
message.IsBodyHtml = true;
message.To.Add(new MailAddress("Fake#gmail.com"));
message.Body = "Please view attachments below.";
sClient.Send(message);
message.Dispose();
}
catch
{
Console.WriteLine("error");
}
}
}
I have also tried to use a stream writer with no success. I have also tried various ways to do a file.CopyToAsync(memoryStreamname). I am not sure what else I am missing or doing wrong here.
Thank you in advance.