private object CoerceType(Type targetType, IDictionary value, out Dictionary <string, MemberInfo> memberMap)
{
object newValue = this.InstantiateObject(targetType, out memberMap);
if (memberMap != null)
{
// copy any values into new object
foreach (object key in value.Keys)
{
MemberInfo memberInfo;
Type memberType = TypeCoercionUtility.GetMemberInfo(memberMap, key as String, out memberInfo);
this.SetMemberValue(newValue, memberType, memberInfo, value[key]);
}
}
return(newValue);
}
internal object CoerceType(Type targetType, object value)
{
bool isNullable = TypeCoercionUtility.IsNullable(targetType);
if (value == null)
{
if (!allowNullValueTypes &&
TCU.GetTypeInfo(targetType).IsValueType&&
!isNullable)
{
throw new JsonTypeCoercionException(String.Format(TypeCoercionUtility.ErrorNullValueType, new System.Object[] { targetType.FullName }));
}
return(value);
}
if (isNullable)
{
// nullable types have a real underlying struct
Type[] genericArgs = targetType.GetGenericArguments();
if (genericArgs.Length == 1)
{
targetType = genericArgs[0];
}
}
Type actualType = value.GetType();
if (TCU.GetTypeInfo(targetType).IsAssignableFrom(TCU.GetTypeInfo(actualType)))
{
return(value);
}
if (TCU.GetTypeInfo(targetType).IsEnum)
{
if (value is String)
{
if (!Enum.IsDefined(targetType, value))
{
// if isn't a defined value perhaps it is the JsonName
foreach (FieldInfo field in TCU.GetTypeInfo(targetType).GetFields())
{
string jsonName = JsonNameAttribute.GetJsonName(field);
if (((string)value).Equals(jsonName))
{
value = field.Name;
break;
}
}
}
return(Enum.Parse(targetType, (string)value));
}
else
{
value = this.CoerceType(Enum.GetUnderlyingType(targetType), value);
return(Enum.ToObject(targetType, value));
}
}
// Value is of the wrong type and it has been deserialized as an IDictionary.
// Previously coercion was supported
// but this generally just caused more problems than it solved, so type hints are recommended now.
// More specifically this can cause annoying problems with tags when a tag is referencing some object
// for which there is no type info for (e.g the field has been removed), that data would have been
// deserialized as an IDictionary, but when the tag gets the information it will try to coerce it
// which will often fail horribly
if (value is IDictionary)
{
return(null);
// Dictionary<string, MemberInfo> memberMap;
// return this.CoerceType(targetType, (IDictionary)value, out memberMap);
}
if (TCU.GetTypeInfo(typeof(IEnumerable)).IsAssignableFrom(TCU.GetTypeInfo(targetType)) &&
TCU.GetTypeInfo(typeof(IEnumerable)).IsAssignableFrom(TCU.GetTypeInfo(actualType)))
{
return(this.CoerceList(targetType, actualType, (IEnumerable)value));
}
if (value is String)
{
if (Type.Equals(targetType, typeof(DateTime)))
{
DateTime date;
if (DateTime.TryParse(
(string)value,
DateTimeFormatInfo.InvariantInfo,
DateTimeStyles.RoundtripKind | DateTimeStyles.AllowWhiteSpaces | DateTimeStyles.NoCurrentDateDefault,
out date))
{
return(date);
}
}
else if (Type.Equals(targetType, typeof(Guid)))
{
// try-catch is pointless since will throw upon generic conversion
return(new Guid((string)value));
}
else if (Type.Equals(targetType, typeof(Char)))
{
if (((string)value).Length == 1)
{
return(((string)value)[0]);
}
}
else if (Equals(targetType, typeof(Uri)))
{
Uri uri;
if (Uri.TryCreate((string)value, UriKind.RelativeOrAbsolute, out uri))
{
return(uri);
}
}
else if (Type.Equals(targetType, typeof(Version)))
{
// try-catch is pointless since will throw upon generic conversion
return(new Version((string)value));
}
}
else if (Type.Equals(targetType, typeof(TimeSpan)))
{
return(new TimeSpan((long)this.CoerceType(typeof(Int64), value)));
}
#if !WINPHONE_8
TypeConverter converter = TypeDescriptor.GetConverter(targetType);
if (converter.CanConvertFrom(actualType))
{
return(converter.ConvertFrom(value));
}
converter = TypeDescriptor.GetConverter(actualType);
if (converter.CanConvertTo(targetType))
{
return(converter.ConvertTo(value, targetType));
}
#endif
try
{
// fall back to basics
return(Convert.ChangeType(value, targetType));
}
catch (Exception ex)
{
throw new JsonTypeCoercionException(
String.Format("Error converting {0} to {1}", new System.Object[] { value.GetType().FullName, targetType.FullName }), ex);
}
}
