StringContent.cs

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using System.IO;
using System.Net.Http.Headers;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
 
namespace System.Net.Http;
 
public class StringContent : ByteArrayContent
{
    public StringContent(string content)
        : this(content, null, null)
    {
    }
 
    public StringContent(string content, Encoding? encoding)
        : this(content, encoding, null)
    {
    }
 
    public StringContent(string content, Encoding? encoding, string? mediaType)
        : base(GetContentByteArray(content, encoding))
    {
        MediaTypeHeaderValue contentType = new MediaTypeHeaderValue((mediaType == null) ? "text/plain" : mediaType)
        {
            CharSet = ((encoding == null) ? HttpContent.DefaultStringEncoding.WebName : encoding.WebName)
        };
        base.Headers.ContentType = contentType;
    }
 
    private static byte[] GetContentByteArray(string content, Encoding encoding)
    {
        if (content == null)
        {
            throw new ArgumentNullException("content");
        }
        if (encoding == null)
        {
            encoding = HttpContent.DefaultStringEncoding;
        }
        return encoding.GetBytes(content);
    }
 
    protected override Task SerializeToStreamAsync(Stream stream, TransportContext? context, CancellationToken cancellationToken)
    {
        if (!(GetType() == typeof(StringContent)))
        {
            return base.SerializeToStreamAsync(stream, context, cancellationToken);
        }
        return SerializeToStreamAsyncCore(stream, cancellationToken);
    }
 
    internal override Stream TryCreateContentReadStream()
    {
        if (!(GetType() == typeof(StringContent)))
        {
            return null;
        }
        return CreateMemoryStreamForByteArray();
    }
}