0

我在 class 中创建了一个包含诸如表单、按钮等的类。然后我在课堂上创建它们的句柄事件。看看下面我的类代码：

        public static class InputBox
    {
        static Form form = new Form();
        static Label label = new Label();
        static TextBox textBox = new TextBox();
        static Button buttonOk = new Button();
        static Button buttonCancel = new Button();
        public static DialogResult Show(string title, string promptText, ref string value)
        {
            form.Text = title;
            label.Text = promptText;
            textBox.Text = value;

            buttonOk.Text = "OK";
            buttonCancel.Text = "Cancel";
            buttonOk.DialogResult = DialogResult.OK;
            buttonCancel.DialogResult = DialogResult.Cancel;

            label.SetBounds(9, 20, 372, 13);
            textBox.SetBounds(12, 36, 372, 20);
            buttonOk.SetBounds(228, 72, 75, 23);
            buttonCancel.SetBounds(309, 72, 75, 23);

            label.AutoSize = true;
            textBox.Anchor = textBox.Anchor | AnchorStyles.Right;
            buttonOk.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;
            buttonCancel.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;

            form.ClientSize = new Size(396, 107);
            form.Controls.AddRange(new Control[] { label, textBox, buttonOk, buttonCancel });

            form.FormBorderStyle = FormBorderStyle.FixedDialog;
            form.StartPosition = FormStartPosition.CenterScreen;

            buttonOk.Click += new EventHandler(buttonOk_Click); //this is the handle code
            buttonCancel.Click += new EventHandler(buttonCancel_Click);//this is the handle code

            form.MinimizeBox = false;
            form.MaximizeBox = false;
            form.AcceptButton = buttonOk;
            form.CancelButton = buttonCancel;

            DialogResult dialogResult = form.ShowDialog();
            value = textBox.Text;
            return dialogResult;
        }

        static void buttonCancel_Click(object sender, EventArgs e)
        {
            form.Close();
        }

        static void buttonOk_Click(object sender, EventArgs e)
    {
        MessageBox.Show("If u click this, You Will Get many Messages as many as you call the class"); 
    }
    }

然后，我在自己的表单代码中这样称呼它：

string strbuffer; // Global Variable

        InputBox.Show("Hi..?", "What Is Your Name?",ref strbuffer);
            //do something...
            InputBox.Show("Hi..?", "What Is Your Age?",ref strbuffer);
            //do something
            InputBox.Show("Hi..?", "How Many Cars do you have?",ref strbuffer);
            //do something

如果我调用该类的次数与调用它的次数一样多，则旧处理程序将永远不会被释放，因此处理程序控制中的代码将与调用该类的次数一样多

我猜当类不再使用时变量不会被释放所以变量总是在你每次调用它时累积

解决这种情况的最佳方法是什么？

4

2 回答 2

0

我不确定你在问什么，但如果它的事件相关问题我会建议解除分配事件。

static void buttonCancel_Click(object sender, EventArgs e)
{
        form.Close();
    buttonOk.Click -= new EventHandler(buttonOk_Click); 
        buttonCancel.Click -= new EventHandler(buttonCancel_Click);
}

static void buttonOk_Click(object sender, EventArgs e)
{
    MessageBox.Show("If u click this, You Will Get many Messages as many as you call the class"); 
    buttonOk.Click -= new EventHandler(buttonOk_Click); 
    buttonCancel.Click -= new EventHandler(buttonCancel_Click);
}
于 2012-12-19T14:02:53.927 回答
0

在这里，我将表单、标签、文本框等的静态变量移到了 Show 方法中。这意味着每次调用此方法时都会获得这些的新实例。因此，事件尚未附加到它。

然后事件处理程序必须更改为不引用静态表单（不再存在），所以我们从按钮中获取了对表单实例的引用。

public static class InputBox
        {

    public static DialogResult Show(string title, string promptText, ref string value)
    {
        Form form = new Form();
        Label label = new Label();
        TextBox textBox = new TextBox();
        Button buttonOk = new Button();
        Button buttonCancel = new Button();

        form.Text = title;
        label.Text = promptText;
        textBox.Text = value;

        buttonOk.Text = "OK";
        buttonCancel.Text = "Cancel";
        buttonOk.DialogResult = DialogResult.OK;
        buttonCancel.DialogResult = DialogResult.Cancel;

        label.SetBounds(9, 20, 372, 13);
        textBox.SetBounds(12, 36, 372, 20);
        buttonOk.SetBounds(228, 72, 75, 23);
        buttonCancel.SetBounds(309, 72, 75, 23);

        label.AutoSize = true;
        textBox.Anchor = textBox.Anchor | AnchorStyles.Right;
        buttonOk.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;
        buttonCancel.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;

        form.ClientSize = new Size(396, 107);
        form.Controls.AddRange(new Control[] { label, textBox, buttonOk, buttonCancel });

        form.FormBorderStyle = FormBorderStyle.FixedDialog;
        form.StartPosition = FormStartPosition.CenterScreen;

        buttonOk.Click += new EventHandler(buttonOk_Click); //this is the handle code
        buttonCancel.Click += new EventHandler(buttonCancel_Click);//this is the handle code

        form.MinimizeBox = false;
        form.MaximizeBox = false;
        form.AcceptButton = buttonOk;
        form.CancelButton = buttonCancel;

        DialogResult dialogResult = form.ShowDialog();
        value = textBox.Text;
        return dialogResult;
    }

    static void buttonCancel_Click(object sender, EventArgs e)
    {
        (sender as Button).FindForm().Close();
    }

    static void buttonOk_Click(object sender, EventArgs e)
{
    MessageBox.Show("If u click this, You Will Get many Messages as many as you call the class"); 
}
}
于 2012-12-19T14:06:53.167 回答