Use AsXXXX methods

The AsXXXX methods represent the conversion from the type to it inherited interfaces or classes. The XXXX represent the name of the inherited class or interfaces in c#. Example AsStream method is available to any interfaces if the class the interface represent or wrapped in c# inherits from Stream class. So in this case, XXXX represent the Stream, the base class.

Delphi

program FromDerivedToBaseConv;

{$APPTYPE CONSOLE}
{$R *.res}

uses
  CNClrLib.EnumTypes,
  CNClrLib.Core;

var
  fileStream: _FileStream;
  stream: _Stream;
  idisposable: _IDisposable;
begin
  fileStream := CoFileStream.CreateInstance('C:\Temp\Test.txt', fmOpenOrCreate);

  // The fileStream in C# inherits from the Stream Class, so to implicitly cast to the
  // base class Stream use the AsXXXX method on the FileStream interface.
  stream := fileStream.AsStream;

  //Convert to IDisposable interface which FileStream inherit from
  idisposable := fileStream.AsIDisposable;

  //To Convert back to FileStream Interface use the Wrap method
  fileStream := CoFileStream.Wrap(stream);
end.

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