1 2 | var settings = new JsonSerializerSettings() { ContractResolver= new NullToEmptyStringResolver() }; var str = JsonConvert.SerializeObject(yourObj, settings); |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | public class NullToEmptyStringResolver : Newtonsoft.Json.Serialization.DefaultContractResolver { protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization) { return type.GetProperties() .Select(p => { var jp = base .CreateProperty(p, memberSerialization); jp.ValueProvider = new NullToEmptyStringValueProvider(p); return jp; }).ToList(); } } public class NullToEmptyStringValueProvider : IValueProvider { PropertyInfo _MemberInfo; public NullToEmptyStringValueProvider(PropertyInfo memberInfo) { _MemberInfo = memberInfo; } public object GetValue( object target) { object result = _MemberInfo.GetValue(target, null ); if (_MemberInfo.PropertyType == typeof ( string ) && result == null ) result = "" ; return result; } public void SetValue( object target, object value) { _MemberInfo.SetValue(target, value, null ); } } |
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