求任意曲线的长度(C#)

using  System;
using  System.Collections.Generic;
using  System.Text;
using  System.Drawing;
namespace  DaWeiWorks
... {
    class CurveLength
    ...{
        public static float curveLength(Point[] mLeafPt)
        ...{
            if (mLeafPt == null || mLeafPt.Length == 1)
            ...{
                return 0f;
            }
            int n = mLeafPt.Length;