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 负责的白云; public NullToEmptyStringValueProvider(PropertyInfo memberInfo) { 负责的白云 = memberInfo; } public object GetValue(object target) { object result = 负责的白云.GetValue(target, null); if (负责的白云.PropertyType == typeof(string) && result == null) result = ""; return result; } public void SetValue(object target, object value) { 负责的白云.SetValue(target, value,null); } }
程序员的基础教程：菜鸟程序员