private static void WriteValue(object obj, JsonWriter writer, bool privateWriter, int depth)
{
if (depth > maxNestingDepth)
{
throw new JsonException(string.Format("Max allowed object depth reached while trying to export from type {0}", obj.GetType()));
}
if (obj == null)
{
writer.Write(null);
return;
}
if (obj is IJsonWrapper)
{
if (privateWriter)
{
writer.TextWriter.Write(((IJsonWrapper)obj).ToJson());
}
else
{
((IJsonWrapper)obj).ToJson(writer);
}
return;
}
if (obj is string)
{
writer.Write((string)obj);
return;
}
if (obj is double)
{
writer.Write((double)obj);
return;
}
if (obj is long)
{
writer.Write((long)obj);
return;
}
if (obj is bool)
{
writer.Write((bool)obj);
return;
}
if (obj is Array)
{
writer.WriteArrayStart();
Array arr = (Array)obj;
Type elemType = arr.GetType().GetElementType();
foreach (object elem in arr)
{
// if the collection contains polymorphic elements, we need to include type information for deserialization
//if (writer.TypeHinting && elem != null & elem.GetType() != elemType) {
// writer.WriteObjectStart();
// writer.WritePropertyName(writer.HintTypeName);
// writer.Write(elem.GetType().FullName);
// writer.WritePropertyName(writer.HintValueName);
// WriteValue(elem, writer, privateWriter, depth + 1);
// writer.WriteObjectEnd();
//} else {
WriteValue(elem, writer, privateWriter, depth + 1);
//}
}
writer.WriteArrayEnd();
return;
}
if (obj is IList)
{
writer.WriteArrayStart();
IList list = (IList)obj;
// collection might be non-generic type like Arraylist
Type elemType = typeof(object);
if (list.GetType().GetGenericArguments().Length > 0)
{
// collection is a generic type like List<T>
elemType = list.GetType().GetGenericArguments()[0];
}
foreach (object elem in list)
{
// if the collection contains polymorphic elements, we need to include type information for deserialization
//if (writer.TypeHinting && elem != null && elem.GetType() != elemType) {
// writer.WriteObjectStart();
// writer.WritePropertyName(writer.HintTypeName);
// writer.Write(elem.GetType().AssemblyQualifiedName);
// writer.WritePropertyName(writer.HintValueName);
// WriteValue(elem, writer, privateWriter, depth + 1);
// writer.WriteObjectEnd();
//} else {
WriteValue(elem, writer, privateWriter, depth + 1);
//}
}
writer.WriteArrayEnd();
return;
}
if (obj is IDictionary)
{
writer.WriteObjectStart();
IDictionary dict = (IDictionary)obj;
// collection might be non-generic type like Hashtable
Type elemType = typeof(object);
if (dict.GetType().GetGenericArguments().Length > 1)
{
// collection is a generic type like Dictionary<T, V>
elemType = dict.GetType().GetGenericArguments()[1];
}
foreach (DictionaryEntry entry in dict)
{
writer.WritePropertyName((string)entry.Key);
// if the collection contains polymorphic elements, we need to include type information for deserialization
//if (writer.TypeHinting && entry.Value != null && entry.Value.GetType() != elemType) {
// writer.WriteObjectStart();
// writer.WritePropertyName(writer.HintTypeName);
// writer.Write(entry.Value.GetType().AssemblyQualifiedName);
// writer.WritePropertyName(writer.HintValueName);
// WriteValue(entry.Value, writer, privateWriter, depth + 1);
// writer.WriteObjectEnd();
//} else {
WriteValue(entry.Value, writer, privateWriter, depth + 1);
//}
}
writer.WriteObjectEnd();
return;
}
Type objType = obj.GetType();
// Try a base or custom importer if one exists
ExporterFunc exporter = GetExporter(objType);
if (exporter != null)
{
exporter(obj, writer);
return;
}
// Last option, let's see if it's an enum
if (obj is Enum)
{
Type enumType = Enum.GetUnderlyingType(objType);
if (enumType == typeof(long))
{
writer.Write((long)obj);
}
else
{
ExporterFunc enumConverter = GetExporter(enumType);
if (enumConverter != null)
{
enumConverter(obj, writer);
}
}
return;
}
// Okay, it looks like the input should be exported as an object
ObjectMetadata tdata = AddObjectMetadata(objType);
writer.WriteObjectStart();
//在Json的第一个字段前插入类型标识
if (writer.TypeHinting)
{
writer.WriteType(objType);
}
foreach (string property in tdata.Properties.Keys)
{
PropertyMetadata pdata = tdata.Properties[property];
// Don't serialize soft aliases (which get added to ObjectMetadata.Properties twice).
if (pdata.Alias != null && property != pdata.Info.Name && tdata.Properties.ContainsKey(pdata.Info.Name))
{
continue;
}
// Don't serialize a field or property with the JsonIgnore attribute with serialization usage
if (pdata.Ignore)
{
continue;
}
if (pdata.IsField)
{
FieldInfo info = (FieldInfo)pdata.Info;
if (pdata.Alias != null)
{
writer.WritePropertyName(pdata.Alias);
}
else
{
writer.WritePropertyName(info.Name);
}
object value = info.GetValue(obj);
//if (writer.TypeHinting && value != null && info.FieldType != value.GetType()) {
// // the object stored in the field might be a different type that what was declared, need type hinting
// writer.WriteObjectStart();
// writer.WritePropertyName(writer.HintTypeName);
// writer.Write(value.GetType().AssemblyQualifiedName);
// writer.WritePropertyName(writer.HintValueName);
// WriteValue(value, writer, privateWriter, depth + 1);
// writer.WriteObjectEnd();
//} else {
WriteValue(value, writer, privateWriter, depth + 1);
//}
}
//暂时去除类属性的序列化操作,因为静态数据里面带有不需要序列化的属性
//else {
// PropertyInfo info = (PropertyInfo)pdata.Info;
// if (info.CanRead) {
// if (pdata.Alias != null) {
// writer.WritePropertyName(pdata.Alias);
// } else {
// writer.WritePropertyName(info.Name);
// }
// object value = info.GetValue(obj, null);
// //if (writer.TypeHinting && value != null && info.PropertyType != value.GetType()) {
// // // the object stored in the property might be a different type that what was declared, need type hinting
// // writer.WriteObjectStart();
// // writer.WritePropertyName(writer.HintTypeName);
// // writer.Write(value.GetType().AssemblyQualifiedName);
// // writer.WritePropertyName(writer.HintValueName);
// // WriteValue(value, writer, privateWriter, depth + 1);
// // writer.WriteObjectEnd();
// //} else {
// WriteValue(value, writer, privateWriter, depth + 1);
// //}
// }
//}
}
writer.WriteObjectEnd();
}
private static ObjectMetadata AddObjectMetadata(Type type)
{
if (objectMetadata.ContainsKey(type))
{
return(objectMetadata[type]);
}
ObjectMetadata data = new ObjectMetadata();
if (type.GetInterface("System.Collections.IDictionary") != null)
{
data.IsDictionary = true;
}
data.Properties = new Dictionary <string, PropertyMetadata>();
// Get all kinds of declared properties
BindingFlags pflags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
foreach (PropertyInfo pinfo in type.GetProperties(pflags))
{
if (pinfo.Name == "Item")
{
ParameterInfo[] parameters = pinfo.GetIndexParameters();
if (parameters.Length != 1)
{
continue;
}
if (parameters[0].ParameterType == typeof(string))
{
data.ElementType = pinfo.PropertyType;
}
continue;
}
// Include properties automatically that have at least one public accessor
bool autoInclude =
(pinfo.GetGetMethod() != null && pinfo.GetGetMethod().IsPublic) ||
(pinfo.GetSetMethod() != null && pinfo.GetSetMethod().IsPublic);
// If neither accessor is public and we don't have a [JsonInclude] attribute, skip it
if (!autoInclude && pinfo.GetCustomAttributes(typeof(JsonInclude), true).Count() == 0)
{
continue;
}
PropertyMetadata pdata = new PropertyMetadata();
pdata.Info = pinfo;
pdata.Type = pinfo.PropertyType;
object[] ignoreAttrs = pinfo.GetCustomAttributes(typeof(JsonIgnore), true).ToArray();
if (ignoreAttrs.Length > 0)
{
pdata.Ignore = true;
}
object[] aliasAttrs = pinfo.GetCustomAttributes(typeof(JsonAlias), true).ToArray();
if (aliasAttrs.Length > 0)
{
JsonAlias aliasAttr = (JsonAlias)aliasAttrs[0];
if (aliasAttr.Alias == pinfo.Name)
{
throw new JsonException(string.Format("Alias name '{0}' must be different from the property it represents for type '{1}'", pinfo.Name, type));
}
if (data.Properties.ContainsKey(aliasAttr.Alias))
{
throw new JsonException(string.Format("'{0}' already contains the property or alias name '{1}'", type, aliasAttr.Alias));
}
pdata.Alias = aliasAttr.Alias;
if (aliasAttr.AcceptOriginal)
{
data.Properties.Add(pinfo.Name, pdata);
}
}
if (pdata.Alias != null)
{
data.Properties.Add(pdata.Alias, pdata);
}
else
{
if (data.Properties.ContainsKey(pinfo.Name))
{
throw new JsonException(string.Format("'{0}' already contains the property or alias name '{1}'", type, pinfo.Name));
}
data.Properties.Add(pinfo.Name, pdata);
}
}
// Get all kinds of declared fields
BindingFlags fflags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
foreach (FieldInfo finfo in type.GetFields(fflags))
{
// If the field isn't public and doesn't have an [Include] attribute, skip it
if (!finfo.IsPublic && finfo.GetCustomAttributes(typeof(JsonInclude), true).Count() == 0)
{
continue;
}
PropertyMetadata pdata = new PropertyMetadata();
pdata.Info = finfo;
pdata.IsField = true;
pdata.Type = finfo.FieldType;
object[] ignoreAttrs = finfo.GetCustomAttributes(typeof(JsonIgnore), true).ToArray();
if (ignoreAttrs.Length > 0)
{
pdata.Ignore = true;
}
object[] aliasAttrs = finfo.GetCustomAttributes(typeof(JsonAlias), true).ToArray();
if (aliasAttrs.Length > 0)
{
JsonAlias aliasAttr = (JsonAlias)aliasAttrs[0];
if (aliasAttr.Alias == finfo.Name)
{
throw new JsonException(string.Format("Alias name '{0}' must be different from the field it represents for type '{1}'", finfo.Name, type));
}
if (data.Properties.ContainsKey(aliasAttr.Alias))
{
throw new JsonException(string.Format("'{0}' already contains the field or alias name '{1}'", type, aliasAttr.Alias));
}
pdata.Alias = aliasAttr.Alias;
if (aliasAttr.AcceptOriginal)
{
data.Properties.Add(finfo.Name, pdata);
}
}
if (pdata.Alias != null)
{
data.Properties.Add(pdata.Alias, pdata);
}
else
{
if (data.Properties.ContainsKey(finfo.Name))
{
throw new JsonException(string.Format("'{0}' already contains the field or alias name '{1}'", type, finfo.Name));
}
data.Properties.Add(finfo.Name, pdata);
}
}
objectMetadata.Add(type, data);
return(data);
}
