public override object ChangeType(object value, Type type, CultureInfo cultureInfo)
{
System.Variant source = new System.Variant(value);
if (cultureInfo == null)
{
cultureInfo = CultureInfo.CurrentCulture;
}
if (type.IsByRef)
{
type = type.GetElementType();
}
if (!type.IsPrimitive && type.IsInstanceOfType(value))
{
return(value);
}
Type type2 = value.GetType();
if (type.IsEnum && type2.IsPrimitive)
{
return(Enum.Parse(type, value.ToString()));
}
if (type2 == typeof(DBNull))
{
if (type == typeof(DBNull))
{
return(value);
}
if ((type.IsClass && type != typeof(object)) || type.IsInterface)
{
return(null);
}
}
object result;
try
{
object obj = OAVariantLib.ChangeType(source, type, 16, cultureInfo).ToObject();
result = obj;
}
catch (NotSupportedException)
{
throw new COMException(Environment.GetResourceString("Interop.COM_TypeMismatch"), -2147352571);
}
return(result);
}
[System.Security.SecuritySafeCritical] // overrides transparent member
public override Object ChangeType(Object value, Type type, CultureInfo cultureInfo)
{
Variant myValue = new Variant(value);
if (cultureInfo == null)
{
cultureInfo = CultureInfo.CurrentCulture;
}
#if DISPLAY_DEBUG_INFO
Console.WriteLine("In OleAutBinder::ChangeType converting variant of type: {0} to type: {1}", myValue.VariantType, type.Name);
#endif
if (type.IsByRef)
{
#if DISPLAY_DEBUG_INFO
Console.WriteLine("Stripping byref from the type to convert to.");
#endif
type = type.GetElementType();
}
// If we are trying to convert from an object to another type then we don't
// need the OLEAUT change type, we can just use the normal COM+ mechanisms.
if (!type.IsPrimitive && type.IsInstanceOfType(value))
{
#if DISPLAY_DEBUG_INFO
Console.WriteLine("Source variant can be assigned to destination type");
#endif
return(value);
}
Type srcType = value.GetType();
// Handle converting primitives to enums.
if (type.IsEnum && srcType.IsPrimitive)
{
#if DISPLAY_DEBUG_INFO
Console.WriteLine("Converting primitive to enum");
#endif
return(Enum.Parse(type, value.ToString()));
}
#if !FEATURE_CORECLR
// Special case the convertion from DBNull.
if (srcType == typeof(DBNull))
{
// The requested type is a DBNull so no convertion is required.
if (type == typeof(DBNull))
{
return(value);
}
// Visual J++ supported converting from DBNull to null so customers
// have requested (via a CDCR) that DBNull be convertible to null.
// We don't however allow this when converting to a value class, since null
// doesn't make sense for these, or to object since this would change existing
// semantics.
if ((type.IsClass && type != typeof(Object)) || type.IsInterface)
{
return(null);
}
}
#endif //!FEATURE_CORECLR
#if FEATURE_COMINTEROP
// Use the OA variant lib to convert primitive types.
try
{
#if DISPLAY_DEBUG_INFO
Console.WriteLine("Using OAVariantLib.ChangeType() to do the conversion");
#endif
// Specify the LocalBool flag to have BOOL values converted to local language rather
// than 0 or -1.
Object RetObj = OAVariantLib.ChangeType(myValue, type, OAVariantLib.LocalBool, cultureInfo).ToObject();
#if DISPLAY_DEBUG_INFO
Console.WriteLine("Object returned from ChangeType is of type: " + RetObj.GetType().Name);
#endif
return(RetObj);
}
#if DISPLAY_DEBUG_INFO
catch (NotSupportedException e)
#else
catch (NotSupportedException)
#endif
{
#if DISPLAY_DEBUG_INFO
Console.Write("Exception thrown: ");
Console.WriteLine(e);
#endif
throw new COMException(Environment.GetResourceString("Interop.COM_TypeMismatch"), unchecked ((int)0x80020005));
}
#else // !FEATURE_COMINTEROP
return(base.ChangeType(value, type, cultureInfo));
#endif // !FEATURE_COMINTEROP
}
// ChangeType
// This binder uses OLEAUT to change the type of the variant.
public override object ChangeType(object value, Type type, CultureInfo?cultureInfo)
{
Variant myValue = new Variant(value);
if (cultureInfo == null)
{
cultureInfo = CultureInfo.CurrentCulture;
}
#if DISPLAY_DEBUG_INFO
Console.WriteLine("In OleAutBinder::ChangeType converting variant of type: {0} to type: {1}", myValue.VariantType, type.Name);
#endif
if (type.IsByRef)
{
#if DISPLAY_DEBUG_INFO
Console.WriteLine("Stripping byref from the type to convert to.");
#endif
type = type.GetElementType() !;
}
// If we are trying to convert from an object to another type then we don't
// need the OLEAUT change type, we can just use the normal COM+ mechanisms.
if (!type.IsPrimitive && type.IsInstanceOfType(value))
{
#if DISPLAY_DEBUG_INFO
Console.WriteLine("Source variant can be assigned to destination type");
#endif
return(value);
}
Type srcType = value.GetType();
// Handle converting primitives to enums.
if (type.IsEnum && srcType.IsPrimitive)
{
#if DISPLAY_DEBUG_INFO
Console.WriteLine("Converting primitive to enum");
#endif
return(Enum.Parse(type, value.ToString() !));
}
// Use the OA variant lib to convert primitive types.
try
{
#if DISPLAY_DEBUG_INFO
Console.WriteLine("Using OAVariantLib.ChangeType() to do the conversion");
#endif
// Specify the LocalBool flag to have BOOL values converted to local language rather
// than 0 or -1.
object RetObj = OAVariantLib.ChangeType(myValue, type, OAVariantLib.LocalBool, cultureInfo).ToObject() !;
#if DISPLAY_DEBUG_INFO
Console.WriteLine("Object returned from ChangeType is of type: " + RetObj.GetType().Name);
#endif
return(RetObj);
}
#if DISPLAY_DEBUG_INFO
catch (NotSupportedException e)
#else
catch (NotSupportedException)
#endif
{
#if DISPLAY_DEBUG_INFO
Console.Write("Exception thrown: ");
Console.WriteLine(e);
#endif
throw new COMException(SR.Interop_COM_TypeMismatch, unchecked ((int)0x80020005));
}
}
