Question

好的，我希望这样做，因为单击按钮的数量有限，因为多个框打开导致我的应用程序崩溃〜:(

这是我的表格代码，我希望阻止它开放给很多人不要误会我想要多个盒子并不多：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
            this.KeyPreview = true;
            this.KeyDown += new KeyEventHandler(Form1_KeyDown);

        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {
            var myForm = new Form2();
            myForm.Show();

        }
        private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Alt && e.KeyCode == Keys.A)
            {
                Form3 f3 = new Form3();
                f3.ShowDialog();
            }

        }

        private void Form2_Load(object sender, EventArgs e)
        {

        }
    }
}

Answer 1

使用私人柜台。每次用户单击按钮时，递增计数器，并在显示新表单之前检查计数器。

private int clickCounter = 0;

private void pictureBox1_Click(object sender, EventArgs e)
{
    this.clickCounter++;
    if (this.clickCounter < 10) // arbitrary number
    {
        var myForm = new Form2();
        myForm.Show();
    }
}

这将有助于确保用户不会滥用表单的单个实例上的按钮。要确保相同的计数器适用于表单的所有实例，请将其设置为静态：

private static int clickCounter = 0;

private void pictureBox1_Click(object sender, EventArgs e)
{
    clickCounter++;
    if (clickCounter < 10) // arbitrary number
    {
        var myForm = new Form2();
        myForm.Show();
    }
}

如果您希望在表单因 Junior Programmer 建议而关闭时减少计数器，则可以绑定到Closing事件。这将有效地限制可以打开的新表单的数量（而不仅仅是限制按钮可以被点击的次数）。这适用于本地和静态计数器版本：

myForm_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
     clickCounter--;
}

private void pictureBox1_Click(object sender, EventArgs e)
{
    if (clickCounter < 10) // arbitrary number
    {
        clickCounter++;
        var myForm = new Form2();
        myForm.Closing += myForm_Closing;
        myForm.Show();
    }
}

Answer 2

这是另一种解决方案，它与p.s.w.g的答案没有多大区别;

public class Form1 : Form {
   private static int count = 0;
   public Form1(){
       InitializeComponent();
       button1.Click += click;
   }
   private void click(object sender, EventArgs e){
      count++;
      if(count > 20) {
          button1.Click -= click;
          count = 0;//If you want to reset
      }
   }
}

Answer 3

只需创建一个全局静态int计数变量并将其设置为0.每次单击该按钮时，增加count（count ++）的值。

因此，当单击该按钮时，将所有事件处理放在下面的语句if而不是我的注释

中

if(count<5)
{
   count++;
   //run your code for the button event
}
else
{
   MessageBox.Show("You have pressed the button too many times");
}

所以使用上面的代码，你的决赛应该是这样的

public partial class Form2 : Form
{
   public static int count=0;
    public Form2()
    {
        InitializeComponent();
        this.KeyPreview = true;
        this.KeyDown += new KeyEventHandler(Form1_KeyDown);

    }

    private void pictureBox1_Click(object sender, EventArgs e)
    {
        if(count<5)
        {
            count++;
            var myForm = new Form2();
            myForm.Show();
        }
        else
        {
            MessageBox.Show("You have pressed the button too many times");
        }
    }
    private void Form1_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.Alt && e.KeyCode == Keys.A)
        {
            Form3 f3 = new Form3();
            f3.ShowDialog();
        }

    }

    private void Form2_Load(object sender, EventArgs e)
    {

    }
}

visual c＃限制可以单击一个按钮的数量

3 个答案: