不存在问题 [英] Does not Exist Issue

问题描述

所以 int count =（int）button.tag 表示按钮不存在，因为按钮被设置为其范围之外的变量。我已经尝试了很多东西来解决这个问题，因为我不能将它放在button_click中，因为这会弄乱这个数。

任何想法该做什么？

So int count = (int)button.tag is saying button does not exist because button is being set to a variable outside of its scope. I have tried numerous things to fix this because I can not place it inside the button_click since that would mess up this count.
Any ideas what to do?

public MapForm(String rows, String cols)
{
    InitializeComponent();
     _col = int.Parse(cols);
    _row = int.Parse(rows);
    Begin();
}

public void Begin()
{
    int width = groupBox1.Width;
    int height = groupBox1.Height;
    int bW = width / _col;
    int bH = height / _row;

    Button[,] buttonArray = new Button[_row, _col];

    for (int i = 0; i < _row; i++)
    {
        for (int j = 0; j < _col; j++)
        {
            Button button = new Button();
            buttonArray[i, j] = button;
            button.Width = bW;
            button.Height = bH;
            button.Left = j * bW;
            button.Top = i * bH;
            button.Tag = 0;

            button.Click += new EventHandler(button_Click);

            groupBox1.Controls.Add(button);
        }
     }
}

int count = (int)button.Tag;

void button_Click(object sender, EventArgs e)
{
    Button button = (Button)sender;

    if (count < 3)
    {
        count++;

        if (count == 1)
        {
            button.Text = "a";
        }

        if (count == 2)
        {
            button.Text = "b";
        }
        if (count == 3)
        {
            button.Text = "c";
        }
    }
}

推荐答案

移动 int count =（int）button.Tag; ... line lower：

Move your int count = (int)button.Tag;... line lower:

void button_Click(object sender, EventArgs e)
{
Button button = (Button)sender;
int count = (int)button.Tag;
if (count < 3)

[更新]

[UPDATED]

void button_Click(object sender, EventArgs e)
{
    Button button = (Button)sender;
    int count = (int)button.Tag;

    if (count < 3)
    {
        count++;

        if (count == 1)
        {
            button.Text = "a";
        }

        if (count == 2)
        {
            button.Text = "b";
        }
        if (count == 3)
        {
            button.Text = "c";
        }
        button.Tag = count; // You need to store value of COUNT to your Button's TAG property
    }
}

我希望它可以帮到你。

I hope it helps you.

但是如果我这样做的话按钮文本始终是

But if I do that the button text is always a

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