Parameter Fixups for InvokeMethod(), GetProperty() and SetProperty()

When you use wwDotnetBridge's InvokeMethod() or GetProperty() or SetProperty() these Proxy methods in some cases fix up the input parameters and return values to mapped types to make it easier to access them from FoxPro.

There are two fix up mechanisms:

Fix up method Return Values and GetProperty() results
Fix up Parameters or `SetProperty() calls

Return Value and GetProperty() Fixups

When you call a method with InvokeMethod() or get a property value with GetProperty() some result values are automatically fixed up.

The following describes how values are fixed up:

.NET Type	Returned As
Long/Int64	FoxPro Decimal (Y)
char	FoxPro String (C(1))
DbNull	FoxPro Null
Array	ComArray Wrapper
List	ComArray Wrapper
Dictionary<T,T1>	ComArray wrapper
HashSet	ComArray wrapper
Guid	ComValue wrapper (string)
byte	ComValue wrapper (int)
char	ComValue wrapper (int)

`InvokeMethod()` Parameters or `SetProperty()` Fixups

When you call a method via InvokeMethod() and pass parameters, or when you call SetProperty() to assign a value, the input value you pass from FoxPro is fixed in some cases as FoxPro cannot easily pass certain types to .NET including Value types, generic types, arrays and collections, Guids and more.

FoxPro Type	.NET Type
.NULL. or Null	DbNull
VarBinary Data	byte[]
ComArray	fixed up to `ComArray.Instance`
ComValue	fixed up to `ComValue.Value`
ComGuid	fixed up to `ComGuid.Value`

Wrapper objects

You may notice the ComArray, ComValue and ComGuid objects in the lists above. These are wwDotnetBridge helper objects that wrap .NET types with an internal instance, and methods that allow FoxPro to manipulate the object or structure which would otherwise not be directly possible using direct COM access.

ComArray for Arrays

The most common use case likely is using the ComArray class to create a .NET array and pass it to .NET. ComArray lets you create and edit .NET arrays inside of .NET without ever having to pass the actual array to FoxPro - instead you can access the individual items in the array - or collection - using the ComArray methods.

ComValue for Unsupported Foxpro Types