var a = this.Position;
var b = target.Position;
var minX = (Int32)Math.Min(a.X, b.X);
var maxX = (Int32)Math.Max(a.X, b.X);
var minY = (Int32)Math.Min(a.Y, b.Y);
var maxY = (Int32)Math.Max(a.Y, b.Y);
var rect = new Rectangle(minX, minY, maxX - minX, maxY - minY);
var point = b;
var ray = new Ray2 { Position = a, Direction = b - a };
foreach (var entity in this.Instance.QuadTree.GetObjects(rect).OfType<Wall>())
{
    Vector2 p;
    OverlapHelper.RayIntersectsBox(ref ray, new Rectangle((Int32)entity.Position.X, (Int32)entity.Position.Y, (Int32)entity.Width, (Int32)entity.Height), out p);

var a = {};
var b = a;