A cast-type array into a common array?

Question

A short version of the question - why can't I do this? I am limited to .NET 3.5.

T[] genericArray;

// Obviously T should be float!
genericArray = new T[3]{ 1.0f, 2.0f, 0.0f };

// Can't do this either, why the hell not
genericArray = new float[3]{ 1.0f, 2.0f, 0.0f };

The longer version is

I work with the Unity engine here, although this is not important. What is it - I am trying to transfer the conversion between its fixed Vector2 (2 floats) and Vector3 (3 floats) and my common class Vector <>. I cannot pass types directly to a shared array.

using UnityEngine;

public struct Vector<T>
{
    private readonly T[] _axes;

    #region Constructors
    public Vector(int axisCount)
    {
        this._axes = new T[axisCount];
    }

    public Vector(T x, T y)
    {
        this._axes = new T[2] { x, y };
    }

    public Vector(T x, T y, T z)
    {
        this._axes = new T[3]{x, y, z};
    }

    public Vector(Vector2 vector2)
    {
        // This doesn't work
        this._axes = new T[2] { vector2.x, vector2.y };
    }

    public Vector(Vector3 vector3)
    {
        // Nor does this
        this._axes = new T[3] { vector3.x, vector3.y, vector3.z };
    }
    #endregion

    #region Properties
    public T this[int i]
    {
        get { return _axes[i]; }
        set { _axes[i] = value; }
    }

    public T X
    {
        get { return _axes[0];}
        set { _axes[0] = value; }
    }

    public T Y
    {
        get { return _axes[1]; }
        set { _axes[1] = value; }
    }

    public T Z
    {
        get
        {
            return this._axes.Length < 2 ? default(T) : _axes[2];
        }
        set
        {
            if (this._axes.Length < 2)
                return;

            _axes[2] = value;
        }
    }
    #endregion

    #region Type Converters
    public static explicit operator Vector<T>(Vector2 vector2)
    {
        Vector<T> vector = new Vector<T>(vector2);

        return vector;
    }

    public static explicit operator Vector<T>(Vector3 vector3)
    {
        Vector<T> vector = new Vector<T>(vector3);

        return vector;
    }
    #endregion
}

Answer 1

"General" means "works with any type."

, , T float.

---

Vector2D <T> gt, , , Vector2D <float> . Convert Vector2D , :

public static class VectorExtensions
{
    public static Vector<float> ToGenericVector(this Vector2D vector)
    {
        return new Vector<float>(vector.X, vector.Y);
    }

    public static Vector2D ToVector2D(this Vector<float> vector)
    {
        return new Vector2D(vector.X, vector.Y);
    }
}

:

Vector<float> v = new Vector<float>(3, 5);

Vector2D v2 = v.ToVector2D();

Answer 2

T float, Vector<T> Vector<float>, ( T), :

var genericArray = new float[3]{ 1.0f, 2.0f, 0.0f };

, T , float ( - T ), , T float , , ?

- :

var genericArray = new T[3]{ X, Y, Z };

Answer 3

.

, , Generic type.

.

public class Class1<T>
{
    public T[] Method(params T[] args)
    {
        return args;
    }
}

public class Demo
{
    public Demo()
    {
        var c1 = new Class1<float>();
        float[] result = c1.Method(1.1f, 2.2f);
    }
}

Answer 4

:

// This doesn't work
this._axes = new T[2] { vector2.x, vector2.y };

( object, object T , , arent , unboxing ):

this._axes = new T[2] { (T)(object)vector2.x, (T)(object)vector2.y };

, .