you cannot ToArray the memory stream until you dispose the DeflateStream (as flush is acutally not implemented (and Deflate/GZip compress blocks of data); the final block is only written on close/dispose.
Try the below code:
public static string Base64Compress(string data, Encoding enc)
{
using (var ms = new MemoryStream())
{
using (var ds = new DeflateStream(ms, CompressionMode.Compress))
{
byte[] b = enc.GetBytes(data);
ds.Write(b, 0, b.Length);
}
return Convert.ToBase64String(ms.ToArray());
}
}
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