C# 将对象传递到多维数组的问题

尝试将坐标传递到多维数组时出现问题。引发的错误：

1在var newArray=item.To2dArray处；在GetInstructions方法中：

列表不包含TO2DRARY的定义，也不包含接受ist类型的第一个参数的可扩展方法TO2DRARY

2在公共部分类SiteMaster：将方法public static Coords[，]添加到2darray时的母版页此列表已添加

扩展方法必须在非泛型静态类中定义

我的列表结构

    public class Route
    {
        public string status_message { get; set; }
        public string route_geometry { get; set; }
        public int status { get; set; }
        //route_instructions is what I'm interested in
        public List<List<object>> route_instructions { get; set; }
    }

    public class Coords
    {
        public int Lat { get; set; }
        public int Lon { get; set; }
        public Coords(string a, string b)
        {
            this.Lat = Convert.ToInt32(a);
            this.Lon = Convert.ToInt32(b);
        }
    }
    List<Coords> Coordinates = new List<Coords>();

---

如果方法是静态的并且位于静态类中，则只能将其用作扩展。 必须将2darray的方法移动到一个额外的静态类。 这就是以下信息的含义：

扩展方法必须在非泛型静态类中定义

另一个问题是，方法的签名不适合： 您正在遍历route.route\u指令，因此项的类型为List，但您的方法需要List

---

您是否已通过此步骤确定问题？

    private void GetInstructions()
    {
            string strurltest = String.Format("https://developers.onemap.sg/privateapi/routingsvc/route?start="+
                        startLat+","+ startLon +"&end="+ destinationLat +","+ destinationLon+"&"+
                        "routeType="+ transportType + "&token="+token);
            WebRequest requestObjGet = WebRequest.Create(strurltest);
            requestObjGet.Method = "GET";
            HttpWebResponse responseObjGet = null;
            responseObjGet = (HttpWebResponse)requestObjGet.GetResponse();
            string strresulttest = null;
            using (Stream stream = responseObjGet.GetResponseStream())
            {
                StreamReader sr = new StreamReader(stream);
                strresulttest = sr.ReadToEnd();
                sr.Close();
            }

            Route route = new JavaScriptSerializer().Deserialize<Route>(strresulttest);
            route_geometry = route.route_geometry;
            //display route instructions

            foreach (var item in route.route_instructions)
            {
                var newArray = item.To2dArray();
                System.Diagnostics.Debug.WriteLine(item[3]);
                TextBox3.Text = TextBox3.Text + Environment.NewLine + item[9];
            }

        }

public static Coords[,] To2dArray(this List<List<Coords>> list)
    {
        if (list.Count == 0 || list[0].Count == 0)
            throw new ArgumentException("The list must have non-zero dimensions.");

        var result = new Coords[list.Count, list[0].Count];
        for (int i = 0; i < list.Count; i++)
        {
            for (int j = 0; j < list[i].Count; j++)
            {
                if (list[i].Count != list[0].Count)
                    throw new InvalidOperationException("The list cannot contain elements (lists) of different sizes.");
                result[i, j] = list[i][j];
            }
        }

        return result;
    }

1.315396,103.764419
1.314333,103.763455
1.312906,103.766496
1.312109,103.772234

foreach (var item in route.route_instructions)
{
      var newArray = item.To2dArray();
///...