C#

public struct MyStruct
{
  public string myString;
  public byte myByte;
  public int myInt;

  // Constructor
  public MyStruct(
    string myString_,
    byte myByte_,
    int myInt_)
  {
    myString = myString_;
    myByte = myByte_;
    myInt = myInt_;
  }
}

public enum MyStructMemberSelector
{
  MY_STRING = 0,
  MY_BYTE,
  MY_INT
};

public MyStruct[] myStructArray = new MyStruct[]
{
  new MyStruct("String 1", (byte)1, 1),
  new MyStruct("String 2", (byte)2, 2)
};

// Returns the selected "column" in myStructArray as an array
public ? getAllItems(MyStructMemberSelector myStructMemberSelector)
{

  return ?;
}

.
.
.
  string[] myStringArray = getAllItems(MyStructMemberSelector.MY_STRING);
  byte[] myByteArray = getAllItems(MyStructMemberSelector.MY_BYTE);
  int[] myIntArray = getAllItems(MyStructMemberSelector.MY_INT);
.
.
.