CODEWITHSUNDEEP
c#
pablof
pablof

Reputation: 335

Getting an array with the content of attributes

I have a class in my code in C# where I want to get all the attributes from a nested class in an array with the size of the number of parameters and the content of all of them in an array of objects. Like these:

class MyClass {
 class Parameters {
  public const string A = "A";
  public const string B = "B";
  public const string C = "C";
  public const string D = "D";
  public const string E = "E";
  public const string F = "F";
 }    

 public object[] getAllParameters() {
    object[] array = new object[6];
    array[0] = Parameters.A;
    array[1] = Parameters.B;
    array[2] = Parameters.C;
    array[3] = Parameters.D;
    array[4] = Parameters.E;
    array[5] = Parameters.F;
}       
//more methods and code

}

But if I want to add for example, G and H parameters, I would have to update the size of the method getAllParameters, the initialization and more stuff in other parts of the code.

Could I do this "getAllParameters" method more generic, without taking account of the explicit parameters? With reflection maybe?

Upvotes: 1

Views: 135

Answers (6)

Ryszard Dżegan
Ryszard Dżegan

Reputation: 25434

Use reflection. Here is an example:

class A
{
    public string F1;
    public string F2;
}

And in the method:

var a = new A();
var fields = typeof (A).GetFields();

var values = from fieldInfo in fields
             select fieldInfo.GetValue(a);

Upvotes: 0

LukeHennerley
LukeHennerley

Reputation: 6434

Because the fields are constants, you don't need an object instance just use null in GetValue. Also - these are fields, not properties.

  var fields = typeof(Parameters).GetFields();
  object[] array = new object[fields.Count()];
  for (int i = 0; i < fields.Count(); i++)
  {
    array[i] = fields[i].GetValue(null);
  }
  return array;

Upvotes: 2

Stephane Delcroix
Stephane Delcroix

Reputation: 16232

You can do that using reflection.

typeof(MyClass).GetFields ();

will return a FieldInfo array. you van then get the value of each field by using

filedinfo.GetValue (myobject);

Upvotes: 0

Jack Malkovich
Jack Malkovich

Reputation: 806

You can combine Type.GetProperties with PropertyInfo.GetValue

Upvotes: -1

Adam K Dean
Adam K Dean

Reputation: 7475

It seems a strange way to do it, but it is possible. You need both the instance of the object and the type of it, you can then get all the properties on the type, loop through each of them and get the value of each said property in the instance of said class.

TestClass obj = new TestClass();
Type t = typeof(TestClass);
foreach (var property in t.GetProperties())
{
    var value = property.GetValue(obj);
}

Upvotes: 0

dutzu
dutzu

Reputation: 3910

What you want is to serialize the class to an array, so why reinvent the wheel? Use existing methods of serializing objects and customize them to your particular need.

Upvotes: 0

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