PowerShellCSharpCollections

<#
    Define a class in C# within PowerShell
    Instantiate it in PowerShell
    Invoke it in PowerShell
#>

$FileDefinitions = @'
using System;
using System.Collections.Generic;

namespace FileDefinitions9 {
    public class FieldFormat {
        public FieldFormat(string fieldName, int fieldOffset, int fieldLength) {
            FieldName = fieldName;
            FieldOffset = fieldOffset;
            FieldLength = fieldLength;
        }

        public void ShowFieldContent() {
            Console.WriteLine(String.Format("Fields definition parts: [{0}];[{1}];[{2}]",
                FieldName, FieldOffset, FieldLength));
        }

        public string FieldName {get;set;}
        public int FieldOffset {get;set;}
        public int FieldLength {get;set;}
    }

    public class RecordFormat {
        private List<FieldFormat> _fields = new List<FieldFormat>();

        public void Add(FieldFormat fieldFormat) {
            _fields.Add(fieldFormat);
        }

        public List<FieldFormat> GetAllFields() {
            return _fields;
        }
    }
}
'@

Add-Type -TypeDefinition $FileDefinitions

$fieldMetadata1 = New-Object FileDefinitions9.FieldFormat("Salary",1,10)
$fieldMetadata2 = New-Object FileDefinitions9.FieldFormat("HireDate",11,14)
$fieldMetadata3 = New-Object FileDefinitions9.FieldFormat("ShoeSize", 25,33)

$fieldMetadata1.ShowFieldContent()
$fieldMetadata2.ShowFieldContent()
$fieldMetadata3.ShowFieldContent()

# Note that a class with no parameters does not get ()...
$recordMetadata = New-Object FileDefinitions9.RecordFormat
$recordMetadata.Add($fieldMetadata1)
$recordMetadata.Add($fieldMetadata2)
$recordMetadata.Add($fieldMetadata3)

#But note that method taking no params absolutely must get the () (without,
# it returns the wrong thing, let's say for now)
$fields = $recordMetadata.GetAllFields()
$fields.Count
$fields