Table of Contents
A separate C# source file with extension ‘.cs’ is generated for each production encountered within an ASN.1 source file. Every ASN.1 type is mapped to a C# class. This is true even at the lowest levels – types such as BOOLEAN, INTEGER, and NULL all have wrapper classes.
The following items may be present in a generated C# file:
Using statements
Namespace specification
Class declaration
A tag constant object declaration
Public member variables
Constructors
Public Decode() method
Public Encode() method
Other methods
Inner SAX Handler class (XER only)
Additional specialized items may be present as well depending on the base type of the target production. These specialized items are discussed in the sections on ASN.1 to C# mappings for the various ASN.1 types.
A complete generated C# source file for the ‘EmployeeNumber’ production within the production within the ASN.1 sample file ‘employee.asn’ can be found on the following page. The ASN.1 production from which this file was generated is as follows:
EmployeeNumber ::= [APPLICATION 2] IMPLICIT INTEGER
The generated code is as follows:
using System;
using Com.Objsys.Asn1.Runtime;
namespace Test {
public class EmployeeNumber : Asn1Integer {
public new readonly static Asn1Tag _TAG =
new Asn1Tag (Asn1Tag.APPL, Asn1Tag.PRIM, 2);
public EmployeeNumber () : base()
{
}
public EmployeeNumber (long value_) : base(value_)
{
}
public override void Decode
(Asn1BerDecodeBuffer buffer, bool explicitTagging, int implicitLength)
{
int llen = (explicitTagging) ?
MatchTag (buffer, _TAG) : implicitLength;
base.Decode (buffer, false, llen);
}
public override int Encode
(Asn1BerEncodeBuffer buffer, bool explicitTagging)
{
int _aal = base.Encode (buffer, false);
if (explicitTagging) {
_aal += buffer.EncodeTagAndLength (_TAG, _aal);
}
return (_aal);
}
}
}
The following sections discuss the various sections of the generated C# source file.