课堂上的未知错误 [英] unknown error in class

问题描述

在我的项目中我要保存2行数据，0行有2点而第1行有3点

i写了2级第1类（点）保持每行的点数另一个类（data_line）是保持每行的点数（Npoint）

i必须在类data_line中的某处出现错误，帮助

Hellow in my project i want to save data of 2 lines,line zero has 2 points while line one has 3 points
i wrote 2 class the 1st class (point) to keep points of each line the other class (data_line) is to keep numbers of points(Npoint) of each line
i must have an error somewhere in class data_line ,help

namespace PreWinf
{
    class point
    {
        private double x,y,z;
        public point()  { }
        public point(double xi, double yi, double zi)
        {   X = xi;     Y = yi;   Z = zi;   }
        public double X{  get{return x;}  set{x=value;}    }
        public double Y{  get{return y;}  set{y=value;}    }
        public double Z{  get{return z;}  set{z=value;}    }
    }
}

namespace PreWinf
{
    class data_line
    {
        private int Npoint;
        //public point[] pnt=new point[100];
        public point[] pnt;
        public data_line()  { }
        
        public data_line(int XNpoint)
        { Npoint = XNpoint; }

        public point this[int i]
        {  get { return pnt[i]; }  set { pnt[i] = value; }    }
        //
        public int NPOINT{  get{return Npoint;}  set{ Npoint = value; }    }
    }
}

        private void FormLoad(object sender, EventArgs e)
        {int i;
            data_line[] Myline = new data_line[100];
            for (i = 0; i < 100; i++)
                Myline[i] = new data_line();

            Myline[0].NPOINT = 2;//line zero has 2 points
            Myline[0].pnt[0].X = 1; Myline[0].pnt[0].Y = 1; Myline[0].pnt[0].Z = 1;
            Myline[0].pnt[1].X = 2; Myline[0].pnt[1].Y = 2; Myline[0].pnt[1].Z = 2;

            Myline[1].NPOINT = 3;//line 1 has 3 points
            Myline[1].pnt[0].X = 1; Myline[1].pnt[0].Y = 2; Myline[1].pnt[0].Z = 3;
            Myline[1].pnt[1].X = 4; Myline[1].pnt[1].Y = 5; Myline[1].pnt[1].Z = 6;
            Myline[1].pnt[2].X = 7; Myline[1].pnt[2].Y = 8; Myline[1].pnt[2].Z = 9;
        }//FormLoad

推荐答案

将 NPOINT 设置为 2 不分配数组来存储积分。

所以当你这样做时;

Setting NPOINT to 2 doesn't allocate the array to store the points.
So when you do this;

Myline[0].NPOINT = 2;

支持字段 pnt data_line 的更改不适用于存储 2 项目。



更改

the backing field pnt of data_line is not changed to cater for storing 2 items.

Change

public int NPOINT{  get{return Npoint;}  set{ Npoint = value; }    }

to

to

public int NPOINT{  get{return Npoint;}  set { Npoint = value; pnt = new point[value]; } }

（请注意，我已经遗漏了任何错误处理和调整大小或点数列表）。



在附注中，我会尝试使用点 点 s而不是数组，我认为添加/删除项目会更容易。



希望这会有所帮助，

Fredrik

(Note that I've left out any error handling and resizing or the points list from this).

On a side note, I would try using a List of points instead of an array, it'll be easier to add/remove items then I think.

Hope this helps,
Fredrik

在Formload中添加代码后它可以工作

it works after adding codes in Formload

data_line[] Myline;//declared globally

private void FormLoad(object sender, EventArgs e)
{int i,j;

    Myline = new data_line[100];
    for (i = 0; i < 100; i++)
        Myline[i] = new data_line();

    for (i = 0; i < 100; i++)
        Myline[i].pnt = new point[100];

    for (i = 0; i < 100; i++)
        for (j = 0; j <100; j++)
            Myline[i].pnt[j] = new point();
    Myline[0].NPOINT = 2;//line zero has 2 points
    Myline[0].pnt[0].X = 1; Myline[0].pnt[0].Y = 1; Myline[0].pnt[0].Z = 1;
    Myline[0].pnt[1].X = 2; Myline[0].pnt[1].Y = 2; Myline[0].pnt[1].Z = 2;

    Myline[1].NPOINT = 3;//line 1 has 3 points
    Myline[1].pnt[0].X = 1; Myline[1].pnt[0].Y = 2; Myline[1].pnt[0].Z = 3;
    Myline[1].pnt[1].X = 4; Myline[1].pnt[1].Y = 5; Myline[1].pnt[1].Z = 6;
    Myline[1].pnt[2].X = 7; Myline[1].pnt[2].Y = 8; Myline[1].pnt[2].Z = 9;
}

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