internal static UnvalidatedObjectCollection <NameValueHeaderValue>?Clone(this UnvalidatedObjectCollection <NameValueHeaderValue>?source)
{
if (source == null)
{
return(null);
}
var copy = new UnvalidatedObjectCollection <NameValueHeaderValue>();
foreach (NameValueHeaderValue item in source)
{
copy.Add(new NameValueHeaderValue(item));
}
return(copy);
}
internal static void SetQuality(UnvalidatedObjectCollection <NameValueHeaderValue> parameters, double?value)
{
Debug.Assert(parameters != null);
NameValueHeaderValue?qualityParameter = NameValueHeaderValue.Find(parameters, qualityName);
if (value.HasValue)
{
// Note that even if we check the value here, we can't prevent a user from adding an invalid quality
// value using Parameters.Add(). Even if we would prevent the user from adding an invalid value
// using Parameters.Add() they could always add invalid values using HttpHeaders.AddWithoutValidation().
// So this check is really for convenience to show users that they're trying to add an invalid
// value.
if ((value < 0) || (value > 1))
{
throw new ArgumentOutOfRangeException(nameof(value));
}
string qualityString = ((double)value).ToString("0.0##", NumberFormatInfo.InvariantInfo);
if (qualityParameter != null)
{
qualityParameter.Value = qualityString;
}
else
{
parameters.Add(new NameValueHeaderValue(qualityName, qualityString));
}
}
else
{
// Remove quality parameter
if (qualityParameter != null)
{
parameters.Remove(qualityParameter);
}
}
}