I need in C# to sort some distances in some objects which are in float. I use delegate and Array.Sort to sort them but it seems that I can't use float.
How can I keep the precision of those float when converting to int?
Is it possible to use Array.Sort with float instead of int in return?
Without using LINQ.
Array.Sort<T>(T[] array, Comparison<T> comparison) is not restricted to any type as long as you provide correct comparison delegate. Comparison delegate should return integer value containing the result of compare operation, not a value to be compared with something. For example, if you have class X with float property Property, you can sort them like this:
public sealed class X
{
public float Property { get; set; }
}
static void Test()
{
var arr = new X[]
{
new X { Property = 5.5f },
new X { Property = 2.5f },
new X { Property = 6.5f },
new X { Property = 1.2f },
};
Array.Sort(arr, (a, b) => a.Property.CompareTo(b.Property));
}
You can use LINQ OrderBy extension method
var arr = new[] { 1.3f, 1.4f };
arr.OrderBy( a => a ).ToArray();
You could use LINQ?
arrayOfFloats = arrayOfFloats.OrderBy(x => x);
The best variant is to use radixsort, see more at
Is there a good radixsort-implementation for floats in C#
Good luck
I guess you are using some older .Net version since in one of your comments you have asked that you do not want to use LINQ.
In that case Yes it is possible use Array.Sort
float[] myfloatarray = new float[5];
Array.Sort(myfloatarray);
This will use
Array.Sort<T>(T[] array);
This does not use any LINQ only generics and is available in .Net 2.0.
Maybe you're confusing the "in" type T which is allowed to be anything, with the return type of the Comparison<T> delegate which must be int?
This works fine:
float[] arr = { 2.3f, 1.1f, 9.0f, 6.6f, };
Array.Sort(arr, (x, y) => SomeMethodReturningInt(x, y));
The second parameter to Sort is a Comparison<float> in this case. In the lambda, x and y are floats.
