Forked from ejsmith/EmptyCollectionContractResolver.cs
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September 10, 2015 20:43
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EmptyCollectionContractResolver
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class EmptyCollectionContractResolver : DefaultContractResolver { | |
protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization) { | |
JsonProperty property = base.CreateProperty(member, memberSerialization); | |
Predicate<object> shouldSerialize = property.ShouldSerialize; | |
property.ShouldSerialize = obj => (shouldSerialize == null || shouldSerialize(obj)) && !IsEmptyCollection(property, obj); | |
return property; | |
} | |
private bool IsEmptyCollection(JsonProperty property, object target) { | |
var value = property.ValueProvider.GetValue(target); | |
var collection = value as ICollection; | |
if (collection != null && collection.Count == 0) | |
return true; | |
if (!typeof(IEnumerable).IsAssignableFrom(property.PropertyType)) | |
return false; | |
var countProp = property.PropertyType.GetProperty("Count"); | |
if (countProp == null) | |
return false; | |
var count = (int)countProp.GetValue(value, null); | |
return count == 0; | |
} | |
} |
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