private static JToken ToJToken(HashSet <string> values, DupPolicy policy)
{
if (values == null)
{
throw new ArgumentNullException(nameof(values));
}
if (values.Count == 0)
{
throw new ArgumentException("the collection of values is empty", nameof(values));
}
if (values.Count == 1)
{
JToken.FromObject(values.First());
}
switch (policy)
{
case DupPolicy.OnlyLast:
return(JToken.FromObject(values.Last()));
case DupPolicy.OnlyFirst:
return(JToken.FromObject(values.First()));
case DupPolicy.Throw:
throw new InvalidOperationException("the collection contains more than one value");
case DupPolicy.Array:
return(JArray.FromObject(values));
default:
throw new ArgumentOutOfRangeException(nameof(policy), policy, null);
}
}
public static JObject ToJObject(this NameValueCollection col,
DupPolicy policy = DupPolicy.OnlyLast)
{
var obj = new JObject();
foreach (var k in col.AllKeys)
{
var values = col.GetValues(k).Touch().ToHashSet();
if (values.Count > 0)
{
obj.Add(k, ToJToken(values, policy));
}
}
return(obj);
}
public static JObject ToJObject(this IEnumerable <KeyValuePair <string, string> > pairs,
DupPolicy policy = DupPolicy.OnlyLast)
{
var obj = new JObject();
foreach (var pair in pairs.GroupBy(m => m.Key))
{
var values = pair.Select(m => m.Value).ToHashSet();
if (values.Count > 0)
{
obj.Add(pair.Key, ToJToken(values, policy));
}
}
return(obj);
}
