Question

我在一个方法中以编程方式创建了一个dataGridViews数组。如何从其他方法访问数组？（在这种情况下按钮单击）。我无法宣布它是班级成员，因为我不知道数组有多大，因为它取决于文件

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    public void Form1_Load(object sender, EventArgs e)
    {
        string[] lines = System.IO.File.ReadAllLines(@"..\..\Diets.txt");

        int diet_num = 0;
        int grid_num = 0;
        foreach (string x in lines) diet_num++;
        grid_num = (diet_num / Constant.DATAGRID_DIETS_IN_GRID) + 1;
        Font dataGridFont = new Font("Microsoft Sans Serif",12, FontStyle.Bold);
        Color c = Color.FromArgb(255,255,128);

        DataGridView[] grid = new DataGridView[grid_num];
        for (int i = 0; i < grid_num; i++)
        {
            grid[i] = new DataGridView();
            grid[i].Tag = i;
            grid[i].Parent = this;
            grid[i].Location = new Point(12, 12 + (8 + Constant.DATAGRID_ROW_HEIGHT * 2) * i);
            grid[i].Visible = true;
            grid[i].RowHeadersVisible = false;
            grid[i].Height = Constant.DATAGRID_ROW_HEIGHT * 2;
            grid[i].Width = Constant.DATAGRID_COLUMN_SIZE * Constant.DATAGRID_DIETS_IN_GRID + 3;
            grid[i].UserAddedRow += Form1_UserAddedRow;
            grid[i].RowTemplate.Height = Constant.DATAGRID_ROW_HEIGHT;
            grid[i].ColumnHeadersHeight = Constant.DATAGRID_ROW_HEIGHT;
            grid[i].AllowUserToResizeColumns = false;
            grid[i].AllowUserToResizeRows = false;
            grid[i].MultiSelect = false;
            grid[i].ColumnHeadersHeightChanged += Form1_ColumnHeadersHeightChanged;
            grid[i].MouseLeave += Form1_MouseLeave;
            grid[i].Font = dataGridFont;
            grid[i].DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
            grid[i].ColumnHeadersDefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
            grid[i].ColumnHeadersDefaultCellStyle.BackColor = c;
            grid[i].EnableHeadersVisualStyles = false;

        }
        this.Width = Constant.DATAGRID_COLUMN_SIZE * Constant.DATAGRID_DIETS_IN_GRID + 40;

        int count = 0;
        foreach (string x in lines)
        {
            DataGridViewColumn col = new DataGridViewTextBoxColumn();
            col.Width = Constant.DATAGRID_COLUMN_SIZE;

            col.HeaderText = x;
            int colIndex = grid[count/12].Columns.Add(col);
            count++;
        }

    }

    private void button1_Click(object sender, EventArgs e)
    {
        grid[0].Visible = false; //can't do that
    }
}

Answer 1

您可以将grid移至课程范围：

public partial class Form1 : Form
{
    DataGridView[] grid = null;

    public void Form1_Load(object sender, EventArgs e)
    {    
        ...
        grid = new DataGridView[grid_num];
        ...
    } 
}

Answer 2

它必须是两个函数的范围变量（它仍然可以是设置它的一个函数），或者你必须将它作为第二个函数的参数（仅当函数1调用函数2时才有效）。

＆＃34;我无法宣布它是班级成员，因为我不知道阵列有多大，因为它取决于文件＆＃34; 这句话对我来说毫无意义。该阵列将始终采用相同数量的存储，无需引用它。你显然在两个功能中都需要它。所以它必须适用于这两种功能。

你试图通过不让它成为班级成员来避免什么问题？

以另一种方法以编程方式创建对象

2 个答案: