public static string GetHeaderValue(string fileName, DispositionResultType dispositionResultType)
{
try
{
// first, try using the .NET built-in generator
ContentDisposition disposition = new ContentDisposition()
{
FileName = fileName,
Inline = dispositionResultType == DispositionResultType.Inline ? true : false
};
return(disposition.ToString());
}
catch (FormatException)
{
// otherwise, fall back to RFC 2231 extensions generator
return(CreateRfc2231HeaderValue(fileName, dispositionResultType));
}
}
private static string CreateRfc2231HeaderValue(string filename, DispositionResultType dispositionResultType)
{
StringBuilder builder = new StringBuilder(string.Format("{0}; filename*=UTF-8''", dispositionResultType.ToString().ToLower()));
byte[] filenameBytes = Encoding.UTF8.GetBytes(filename);
foreach (byte b in filenameBytes)
{
if (IsByteValidHeaderValueCharacter(b))
{
builder.Append((char)b);
}
else
{
AddByteToStringBuilder(b, builder);
}
}
return(builder.ToString());
}