// It expects that it is not invoked when there is no value to
// assign.
// When it is passed null, then it returns a default instance.
// For example, passing null as Int32 results in 0.
// But do not immediately try to instantiate with the type, since the type might be abstract.
object DoGetCorrectlyTypedValue (XamlMember xm, XamlType xt, object value)
{
if (value == null) {
if (xt.IsContentValue (service_provider)) // it is for collection/dictionary key and item
return null;
else
return xt.IsNullable ? null : xt.Invoker.CreateInstance (new object [0]);
}
if (xt == null)
return value;
// Not sure if this is really required though...
var vt = sctx.GetXamlType (value.GetType ());
if (vt.CanAssignTo (xt))
return value;
// FIXME: this could be generalized by some means, but I cannot find any.
if (xt.UnderlyingType == typeof (XamlType) && value is string)
value = ResolveTypeFromName ((string) value);
// FIXME: this could be generalized by some means, but I cannot find any.
if (xt.UnderlyingType == typeof (Type))
value = new TypeExtension ((string) value).ProvideValue (service_provider);
if (xt == XamlLanguage.Type && value is string)
value = new TypeExtension ((string) value);
if (IsAllowedType (xt, value))
return value;
var xtc = xm?.TypeConverter ?? xt.TypeConverter;
if (xtc != null && value != null) {
var tc = xtc.ConverterInstance;
if (tc != null && tc.CanConvertFrom (value.GetType ()))
value = tc.ConvertFrom (service_provider, null, value);
return value;
}
throw new XamlObjectWriterException (String.Format ("Value '{0}' (of type {1}) is not of or convertible to type {0} (member {3})", value, value != null ? (object) value.GetType () : "(null)", xt, xm));
}
// It expects that it is not invoked when there is no value to
// assign.
// When it is passed null, then it returns a default instance.
// For example, passing null as Int32 results in 0.
// But do not immediately try to instantiate with the type, since the type might be abstract.
object DoGetCorrectlyTypedValue(XamlMember xm, XamlType xt, object value)
{
if (value == null)
{
if (xt.IsContentValue(service_provider)) // it is for collection/dictionary key and item
{
return(null);
}
else
{
return(xt.IsNullable ? null : xt.Invoker.CreateInstance(new object [0]));
}
}
if (xt == null)
{
return(value);
}
// Not sure if this is really required though...
var vt = sctx.GetXamlType(value.GetType());
if (vt.CanAssignTo(xt))
{
return(value);
}
// FIXME: this could be generalized by some means, but I cannot find any.
if (xt.UnderlyingType == typeof(XamlType) && value is string)
{
value = ResolveTypeFromName((string)value);
}
// FIXME: this could be generalized by some means, but I cannot find any.
if (xt.UnderlyingType == typeof(Type))
{
value = new TypeExtension((string)value).ProvideValue(service_provider);
}
if (xt == XamlLanguage.Type && value is string)
{
value = new TypeExtension((string)value);
}
if (IsAllowedType(xt, value))
{
return(value);
}
var xtc = (xm != null ? xm.TypeConverter : null) ?? xt.TypeConverter;
if (xtc != null && value != null)
{
var tc = xtc.ConverterInstance;
if (tc != null && tc.CanConvertFrom(value.GetType()))
{
value = tc.ConvertFrom(value);
}
return(value);
}
throw new XamlObjectWriterException(String.Format("Value '{0}' (of type {1}) is not of or convertible to type {0} (member {3})", value, value != null ? (object)value.GetType() : "(null)", xt, xm));
}
public override void WriteStartObject (XamlType xamlType)
{
if (xamlType == null)
throw new ArgumentNullException ("xamlType");
manager.StartObject ();
var xm = members.Count > 0 ? members.Peek () : null;
var pstate = xm != null ? object_states.Peek () : null;
var wpl = xm != null && xm != XamlLanguage.Items ? pstate.WrittenProperties : null;
if (wpl != null && wpl.Contains (xm))
throw new XamlDuplicateMemberException (String.Format ("Property '{0}' is already set to this '{1}' object", xm, pstate.Type));
var cstate = new ObjectState () {Type = xamlType, IsInstantiated = false};
object_states.Push (cstate);
if (!xamlType.IsContentValue ()) // FIXME: there could be more conditions e.g. the type requires Arguments.
InitializeObjectIfRequired (true);
if (wpl != null) // note that this adds to the *owner* object's properties.
wpl.Add (xm);
}
// It expects that it is not invoked when there is no value to
// assign.
// When it is passed null, then it returns a default instance.
// For example, passing null as Int32 results in 0.
// But do not immediately try to instantiate with the type, since the type might be abstract.
object GetCorrectlyTypedValue(XamlMember xm, XamlType xt, object value, bool fallbackToString = false)
{
try
{
if (value == null)
{
if (xt.IsContentValue(service_provider)) // it is for collection/dictionary key and item
{
return(null);
}
else
{
return(xt.IsNullable ? null : xt.Invoker.CreateInstance(new object[0]));
}
}
if (ReferenceEquals(xt, null))
{
return(value);
}
// Not sure if this is really required though...
var vt = sctx.GetXamlType(value.GetType());
if (vt.CanAssignTo(xt))
{
return(value);
}
// FIXME: this could be generalized by some means, but I cannot find any.
if (xt.UnderlyingType == typeof(XamlType) && value is string)
{
value = ResolveTypeFromName((string)value);
}
// FIXME: this could be generalized by some means, but I cannot find any.
if (xt.UnderlyingType == typeof(Type))
{
value = new TypeExtension((string)value).ProvideValue(service_provider);
}
if (ReferenceEquals(xt, XamlLanguage.Type) && value is string)
{
value = new TypeExtension((string)value);
}
if (IsAllowedType(xt, value))
{
return(value);
}
var xtc = xm?.TypeConverter ?? xt.TypeConverter;
if (xtc != null && value != null)
{
var tc = xtc.ConverterInstance;
if (tc != null && tc.CanConvertFrom(service_provider, value.GetType()))
{
value = tc.ConvertFrom(service_provider, CultureInfo.InvariantCulture, value);
}
return(value);
}
}
catch (Exception ex)
{
// For + ex.Message, the runtime should print InnerException message like .NET does.
throw new XamlObjectWriterException(String.Format("Could not convert object \'{0}' (of type {1}) to {2}: ", value, value != null ? (object)value.GetType() : "(null)", xt) + ex.Message, ex);
}
return(fallbackToString ?
value :
throw new XamlObjectWriterException(String.Format("Value '{0}' (of type {1}) is not of or convertible to type {2} (member {3})", value, value != null ? (object)value.GetType() : "(null)", xt, xm)));
}
public override void WriteStartObject (XamlType xamlType)
{
if (xamlType == null)
throw new ArgumentNullException ("xamlType");
manager.StartObject ();
var xm = members.Count > 0 ? members.Peek () : null;
var pstate = xm != null ? object_states.Peek () : null;
var wpl = xm == null || xm.Type.IsCollection || xm.Type.IsDictionary ? null : pstate.WrittenProperties;
if (wpl != null && wpl.Contains (xm))
throw new XamlDuplicateMemberException (String.Format ("Property '{0}' is already set to this '{1}' object", xm, pstate.Type));
var cstate = new ObjectState () {Type = xamlType, IsInstantiated = false};
object_states.Push (cstate);
if (!xamlType.IsContentValue (service_provider))
InitializeObjectIfRequired (true);
if (wpl != null) // note that this adds to the *owner* object's properties.
wpl.Add (xm);
}