无法以新的形式访问数组，C＃ [英] Cannot access array in a new form, C#

问题描述

亲爱的所有人，



我对我的项目感到困惑，我需要一些帮助。我正在使用Visual Studio 2017，用于C＃。



基本上我的问题是我无法访问Form1中生成的Form2中的数组。但问题有点好笑。我在Form1中生成一个矩阵，用作Form2中的位图。所以我基于一些实验数据在Form1中生成了一些矩阵，然后我可以将这个数组及其cols和行的数量传递给Form2，然后我可以将它显示为位图图片。



我还有一小段代码，如果我点击它，它会显示图像的X和Y坐标。这对我来说非常重要，因为基于这些坐标，我可以在不同的其他数组中查找值。我有一个数组作为位图组成图片，但我为每个像素分配了许多其他数据，我想将它们存储在不同的数组中。



什么是在Form2中显示数组及其值的最简单方法吗？我不想从Form2编辑数组，我只是想能够读取它们。所以当我点击图片时，我可以查找对应坐标的值。



感谢您的帮助和建议！



我尝试了什么：



在Form1中，这部分代码有效：

Dear All,

I am stuck with my project a little bit and I need a little help. I am using Visual Studio 2017, for C#.

Basically my problem is that I cannot access an array in Form2 that is produced in the Form1. But the problem is a bit funny. I generate a matrix in Form1 that will be used as a bitmap in Form2. So I generate some matrix in Form1 based on some experimental data, and then I can pass this array and the number of its cols and rows to Form2 and then I can show it there as a bitmap picture.

I also have a small piece of code that shows the X and Y coordinates of the image if I click on it. This is very important for me, because based on these coordinates, I can look up values in different other arrays. I have one array that is making up the picture as a bitmap, but I assign many other data for each pixel and I want to store them in different arrays.

What is the easiest way to make an array and its values visible in Form2? I don't want to edit the arrays from Form2, I just want to be able to read them. So when I click on the picture, I can look up the values corresponding for the coordinates.

Thank you for the help and advice!

What I have tried:

In Form1, this part of the code works:

Form2 newForm2 = new Form2(); //initialize a new form = Form2
               newForm2.ShowSLImg(ROWS, COLUMNS, array2D); //pass the values to the Form2's function
                newForm2.Show(this); //show the form2.

然后在Form2中，我使用了一个函数：

Then in Form2, I use a function:

public void ShowSLImg(int _row, int _column, double[,] aarray2D)
        {...dosomething...}

所以我能够将array2D和ROWS，COLUMNS传递给Form2，我可以使用它并基于array2D值，我能够在Form2中显示位图图像。



在这部分代码中，我可以获取鼠标位置的坐标，也可以根据颜色做一些事情。但我想扩展这个功能，并能够根据x，y坐标查找不同的数组。

So I am able to pass the array2D and ROWS, COLUMNS to the Form2 and I can work with it and based on the array2D values, I am able to show a bitmap image in the Form2.

In this part of the code, I can fetch the coordinates of the mouse position and also I can do something based on the color. But I would like to extend this function and be able to look up different array based on the x,y coordinates.

public void pictureBox1_MouseClick(object sender, MouseEventArgs e)
        {
           
            Color color = image2.GetPixel(e.X, e.Y); //Get the pixel color as RGB

            double Red = color.R; //Get only the RED color

            label1.Text = (Red / 255).ToString(); 

            int _x = Convert.ToInt32(e.X);
            int _y = Convert.ToInt32(e.Y);

            TextBox.Text += "X: "+_x.ToString() + " Y: " + _y.ToString() +Environment.NewLine;
 
        }

推荐答案

所以你使用array2D参数来构建你的位图，但你想要访问它

你的Form2代码？

这很简单：只需声明一个私有变量并让它引用数组参数：

So you use the array2D parameter to build your bitmap, but you want to access it leter in
your Form2 code?
That's simple: just declare a private variable and have it reference the array parameter:

private int rows = 0;
private int columns = 0;
private double[,] array2D = null;
public void ShowSLImg(int _row, int _column, double[,] aarray2D)
   {
   rows = _row;
   columns = _column;
   this.array2D = aarray2D;
   ...dosomething...
   }

然后，您可以从Form2代码的任何部分访问原始数据。

Then you can access the raw data from any part of your Form2 code.

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