public void CoerceType_DictionaryToExpando_CoercesViaDictionaryCopy()
{
var input = new Hashtable
{
{ "One", 1 },
{ "Two", 2 },
{ "Three", 3 },
{ "Four", 4 }
};
dynamic expected = new ExpandoObject();
expected.One = 1;
expected.Two = 2;
expected.Three = 3;
expected.Four = 4;
var settings = new DataReaderSettings();
var actual = new TypeCoercionUtility(settings, settings.AllowNullValueTypes).CoerceType(expected.GetType(), input);
Assert.Equal(expected, actual);
}
public void CoerceType_ExpandoToGenericDictionary_CoercesViaGenericDictionaryCopy()
{
dynamic input = new ExpandoObject();
input.One = 1;
input.Two = 2;
input.Three = 3;
input.Four = 4;
var expected = new Dictionary <string, object>
{
{ "One", 1 },
{ "Two", 2 },
{ "Three", 3 },
{ "Four", 4 }
};
var settings = new DataReaderSettings();
var actual = new TypeCoercionUtility(settings, settings.AllowNullValueTypes).CoerceType(typeof(Dictionary <string, object>), input);
Assert.Equal(expected, actual);
}
public void CoerceType_ListToArray_CoercesViaListCtor()
{
var input = new List <string>
{
"One",
"Two",
"Three",
"Four"
};
var expected = new string[]
{
"One",
"Two",
"Three",
"Four"
};
var settings = new DataReaderSettings();
var actual = new TypeCoercionUtility(settings, settings.AllowNullValueTypes).CoerceType(expected.GetType(), input);
Assert.Equal(expected, actual);
}
private object CoerceList(Type targetType, Type valueType, IEnumerable value)
{
targetType = TypeCoercionUtility.ResolveInterfaceType(targetType);
if (targetType.IsArray)
{
// arrays are much simpler to create
return(this.CoerceArray(targetType.GetElementType(), value));
}
// targetType serializes as a JSON array but is not an array
// assume is an ICollection or IEnumerable with AddRange, Add,
// or custom Constructor with which we can populate it
FactoryMap factory = this.ResolverCache.LoadFactory(targetType);
if (factory == null)
{
throw new TypeCoercionException(String.Format(
TypeCoercionUtility.ErrorCtor,
targetType.FullName));
}
foreach (Type argType in factory.ArgTypes)
{
if (argType.IsAssignableFrom(valueType))
{
try
{
// invoke first constructor that can take this value as an argument
return(factory[argType](value));
}
catch
{
// there might exist a better match
continue;
}
}
}
if (factory.Ctor == null)
{
throw new TypeCoercionException(String.Format(
TypeCoercionUtility.ErrorCtor,
targetType.FullName));
}
// attempt bulk insert first as is most efficient
if (factory.AddRange != null &&
factory.AddRangeType != null &&
factory.AddRangeType.IsAssignableFrom(valueType))
{
object collection = factory.Ctor();
factory.AddRange(collection, value);
return(collection);
}
// attempt sequence of single inserts next
if (factory.Add != null &&
factory.AddType != null)
{
object collection = factory.Ctor();
Type addType = factory.AddType;
// loop through adding items to collection
foreach (object item in value)
{
factory.Add(collection, this.CoerceType(addType, item));
}
return(collection);
}
try
{
// finally fall back to basics
return(Convert.ChangeType(value, targetType, CultureInfo.InvariantCulture));
}
catch (Exception ex)
{
throw new TypeCoercionException(
String.Format(
"Error converting {0} to {1}",
value.GetType().FullName,
targetType.FullName),
ex);
}
}
/// <summary>
/// Coerces the object value to Type of <paramref name="targetType"/>
/// </summary>
/// <param name="targetType"></param>
/// <param name="value"></param>
/// <returns></returns>
public object CoerceType(Type targetType, object value)
{
if (targetType == null || targetType == typeof(object))
{
return(value);
}
bool isNullable = TypeCoercionUtility.IsNullable(targetType);
if (value == null)
{
// TODO: validate that this is what we want
if (!this.AllowNullValueTypes &&
targetType.IsValueType &&
!isNullable)
{
throw new TypeCoercionException(String.Format(
TypeCoercionUtility.ErrorNullValueType,
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 (targetType.IsAssignableFrom(actualType))
{
return(value);
}
if (targetType.IsEnum)
{
if (value is String)
{
if (!Enum.IsDefined(targetType, value))
{
IDictionary <string, MemberMap> maps = this.ResolverCache.LoadMaps(targetType);
if (maps != null && maps.ContainsKey((string)value))
{
value = maps[(string)value].Name;
}
}
return(Enum.Parse(targetType, (string)value, false));
}
else
{
value = this.CoerceType(Enum.GetUnderlyingType(targetType), value);
return(Enum.ToObject(targetType, value));
}
}
if (value is IDictionary <string, object> )
{
return(this.CoerceType(targetType, (IDictionary <string, object>)value));
}
else if (value is IDictionary)
{
return(this.CoerceType(targetType, (IDictionary)value));
}
if (typeof(IEnumerable).IsAssignableFrom(targetType) &&
typeof(IEnumerable).IsAssignableFrom(actualType))
{
return(this.CoerceList(targetType, actualType, (IEnumerable)value));
}
if (value is String)
{
if (targetType == typeof(DateTime))
{
DateTime date;
try{
date = DateTime.Parse(
(string)value,
CultureInfo.InvariantCulture,
DateTimeStyles.RoundtripKind | DateTimeStyles.AllowWhiteSpaces | DateTimeStyles.NoCurrentDateDefault);
if (date.Kind == DateTimeKind.Local)
{
return(date.ToUniversalTime());
}
return(date);
}catch (Exception) {}
if (JsonFx.Model.Filters.MSAjaxDateFilter.TryParseMSAjaxDate(
(string)value,
out date))
{
return(date);
}
}
else if (targetType == typeof(Guid))
{
// try-catch is pointless since will throw upon generic conversion
return(new Guid((string)value));
}
else if (targetType == typeof(Char))
{
if (((string)value).Length == 1)
{
return(((string)value)[0]);
}
}
else if (targetType == typeof(Uri))
{
Uri uri;
if (Uri.TryCreate((string)value, UriKind.RelativeOrAbsolute, out uri))
{
return(uri);
}
}
else if (targetType == typeof(Version))
{
// try-catch is pointless since will throw upon generic conversion
return(new Version((string)value));
}
else if (targetType == typeof(TimeSpan))
{
try{
return(TimeSpan.FromTicks(Int64.Parse((string)value)));
}catch (Exception) {}
try{
return(TimeSpan.Parse((string)value));
}catch (Exception) {}
}
}
else if (targetType == typeof(TimeSpan))
{
return(new TimeSpan((long)this.CoerceType(typeof(Int64), value)));
}
#if !SILVERLIGHT
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, CultureInfo.InvariantCulture));
}
catch (Exception ex)
{
throw new TypeCoercionException(
String.Format(
"Error converting {0} to {1}",
value.GetType().FullName,
targetType.FullName),
ex);
}
}
/// <summary>
/// Instantiates a new instance of objectType.
/// </summary>
/// <param name="objectType"></param>
/// <returns>objectType instance</returns>
internal object InstantiateObject(Type targetType, object args)
{
targetType = TypeCoercionUtility.ResolveInterfaceType(targetType);
FactoryMap factory = this.ResolverCache.LoadFactory(targetType);
if ((factory == null) || (factory.Ctor == null))
{
throw new TypeCoercionException(String.Format(
TypeCoercionUtility.ErrorCtor,
targetType.FullName));
}
if ((factory.CtorArgs == null) || (factory.CtorArgs.Length < 1))
{
// default constructor
return(factory.Ctor());
}
object[] ctorArgs = new object[factory.CtorArgs.Length];
IDictionary <string, object> genericArgs = args as IDictionary <string, object>;
if (genericArgs != null)
{
for (int i = 0, length = ctorArgs.Length; i < length; i++)
{
string name = factory.CtorArgs[i].Name;
Type type = factory.CtorArgs[i].ParameterType;
foreach (string key in genericArgs.Keys)
{
try
{
if (StringComparer.OrdinalIgnoreCase.Equals(key, name))
{
ctorArgs[i] = this.CoerceType(type, genericArgs[key]);
break;
}
}
catch { }
}
}
}
else
{
IDictionary otherArgs = args as IDictionary;
if (otherArgs != null)
{
for (int i = 0, length = ctorArgs.Length; i < length; i++)
{
string name = factory.CtorArgs[i].Name;
Type type = factory.CtorArgs[i].ParameterType;
foreach (string key in otherArgs.Keys)
{
try
{
if (StringComparer.OrdinalIgnoreCase.Equals(key, name))
{
ctorArgs[i] = this.CoerceType(type, otherArgs[key]);
break;
}
}
catch { }
}
}
}
}
// use a custom constructor
return(factory.Ctor(ctorArgs));
}
