Post byte array to Web API server using HttpClient

Question

I want to post this data to Web API server:

public sealed class SomePostRequest
{
    public int Id { get; set; }
    public byte[] Content { get; set; }
}
<         


        

Answer 1

I convert Byte Array into Base64 String to post:

await client.PostAsJsonAsync( apiUrl,  
    new  {
        message = "",
        content = Convert.ToBase64String(yourByteArray),
    }
);

and receiver can convert the Base64 String back to Byte Array by:

string base64Str = (string)postBody.content;
byte[] fileBytes = Convert.FromBase64String(base64Str);