Receive images in ASP.Net Core and save to Entity Framework

Question

Good afternoon,

Can anyone tell me how to get an image on ASP.Net Core ?

I have the html page that tries to send to the server:

<form method="post" enctype="multipart/form-data" asp-controller="Produto" asp-action="ImageLoad">
<div class="form-group">
    <div class="col-md-10">
        <p>Upload one or more files using this form:</p>
        <input type="file" name="files"/>
    </div>
</div>
<div class="form-group">
    <div class="col-md-10">
        <input type="submit" value="Upload" />
    </div>
</div>
</form>

But I don’t know how to get that image on, and save it in the bank with Entity.

I believe it’s something like :

[HttpPost]
public async Task ImageLoad(List<IFormFile> files)
{
    foreach (var file in files)
    {
        // do something
    }

Could someone help me ?

Answer 1

From what I could see the code could receive 1 or several photos, but in your html failed to declare what the attribute is multiple in the input type file, alteration:

<form method="post" enctype="multipart/form-data" 
      asp-controller="Produto" asp-action="ImageLoad">
<div class="form-group">
    <div class="col-md-10">
        <p>Upload one or more files using this form:</p>
        <input type="file" name="files" multiple/> // multiple
    </div>
</div>
<div class="form-group">
    <div class="col-md-10">
        <input type="submit" value="Upload" />
    </div>
</div>
</form>

Another however is want to write to the database, would then write the array de bytes or the way? If it is the array de bytes the code goes like this:

[HttpPost]
public async Task ImageLoad(List<IFormFile> files)
{
    byte[] arq = null;
    foreach (var file in files)
    {           
        using (BinaryReader reader = new BinaryReader(file.OpenReadStream()))
        {
            arq = reader.ReadBytes((int)file.Length);
        }           
        // operações de gravação e utilize
        // a variável file para mandar o valor para o tabela
    }
}

now if you are going to write to a directory it is nice to just use the value of the file and have the path written in the table of the database and the file in some directory of your preference, example:

[HttpPost]
public async Task ImageLoad(List<IFormFile> files)
{
    foreach (var file in files)
    {
        file.CopyTo(new FileStream("/diretorio/name_do_arquivo", FileMode.Create));
    }
}

These are real forms, but, generic, because the context of the question became vague, if you put more information I edit this part and put its reality, but, already serves as a basis.

_References

• Iformfile Interface
• Filestream class
• Iformfile.Copyto Method

Answer 2

//Convert IFromFile para base64
  private string ConvertIFromFileToBase64(IFormFile file)
  {
      Stream stream = file.OpenReadStream();
      using (var memoryStream = new MemoryStream())
      {
           stream.CopyTo(memoryStream);
           return Convert.ToBase64String(memoryStream.ToArray());
      }
  }

now only save in bank normally