/// <summary>
/// Determines whether the HTTP content has a valid length in bytes.
/// </summary>
/// <returns>
/// Returns <see cref="T:System.Boolean"/>.true if <paramref name="length"/> is a valid length; otherwise, false.
/// </returns>
/// <param name="length">The length in bytes of the HTTP content.</param>
public bool TryComputeLength(out long length)
{
long result = 0;
foreach (var content in _contents)
{
result += Boundary.Length + 4;
result += HttpHeaderContent.ComputeLength(content.Headers);
long contentLength;
if (!content.TryComputeLength(out contentLength))
{
length = 0;
return(false);
}
result += contentLength;
result += 2;
}
result += Boundary.Length + 6;
length = result;
return(true);
}
private async Task WriteTo(Stream stream, bool withHeaders)
{
if (withHeaders)
{
await HttpHeaderContent.WriteTo(Headers, stream);
}
var boundaryStart = Encoding.UTF8.GetBytes($"--{Boundary}\r\n");
var boundaryEnd = Encoding.UTF8.GetBytes($"--{Boundary}--\r\n");
var lineBreak = Encoding.UTF8.GetBytes("\r\n");
foreach (var content in _contents)
{
await stream.WriteAsync(boundaryStart, 0, boundaryStart.Length);
await HttpHeaderContent.WriteTo(content.Headers, stream);
await content.CopyToAsync(stream);
// ensure line break
await stream.WriteAsync(lineBreak, 0, lineBreak.Length);
}
await stream.WriteAsync(boundaryEnd, 0, boundaryEnd.Length);
}