wwDotNetBridge::GetArrayItem

Returns an array item from a .NET array property tied to an object instance.

DO wwDotNetBridge

loBridge = CREATEOBJECT("wwDotNetBridge")
loItem = loBridge.CreateInstance("Westwind.WebConnection.VfpTestClass")

*** Create a new person object
loPerson = loBridge.CreateInstance("Westwind.WebConnection.Person")
loPerson.Name = "Jim johnson"
loPerson.Company = "Temporary traders"

*** Create one element array and set the first slot to loPerson
loBridge.CreateArrayOnInstance(loItem,"PersonArray",loPerson)

*** Retrieve it so we can see it worked
loPerson = loBridge.GetArrayItem(loItem,"PersonArray",0)
? loPerson.Name
? loPerson.Company

Note that this method may not be necesary if you are only reading array/collection values in a read-only fashion. Indexers (object.Array[1]) will work as long as the array isn't updated and if you can use indexers for better performance without overhead of calling back into .NET for retrieving array elements.

This method works on arrays and collections (using indexers) that ordinarily don't work with indexers such as arrays of value types.

o.GetArrayItem(loBaseObject,lcArrayProperty,lnIndex)

Return Value

the object/value

Parameters

loBaseObject
The base object reference on which the array is defined.

lcArrayProperty
The string name of the array property

lnIndex
The index of the item to retrieve as a 0 based value.

Remarks

This method only works on arrays that are properties of another object not on raw array instances. The reason for this is that VFP changes .NET arrays into FoxPro arrays and the .NET type information gets lost in the process resulting in an object that can't be further manipulated or be passed back to .NET easily. Hence only root arrays are supported.


See also:

Class wwDotNetBridge | Accessing Arrays

© West Wind Technologies, 1996-2019 • Updated: 03/03/11
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