public EntityTagHeaderValue CreateETag(IDictionary <string, object> properties, TimeZoneInfo timeZoneInfo = null)
{
if (properties == null)
{
throw Error.ArgumentNull(nameof(properties));
}
if (properties.Count == 0)
{
return(null);
}
StringBuilder builder = new StringBuilder();
builder.Append('\"');
bool firstProperty = true;
foreach (object propertyValue in properties.Values)
{
if (firstProperty)
{
firstProperty = false;
}
else
{
builder.Append(Separator);
}
string str = propertyValue == null
? NullLiteralInETag
: ConventionsHelpers.GetUriRepresentationForValue(propertyValue, timeZoneInfo);
// base64 encode
byte[] bytes = Encoding.UTF8.GetBytes(str);
string etagValueText = Convert.ToBase64String(bytes);
builder.Append(etagValueText);
}
builder.Append('\"');
string tag = builder.ToString();
return(new EntityTagHeaderValue(tag, isWeak: true));
}