Question

我生成六个数字，将它们添加到一个数组并在标签中显示它们，在我尝试对整数进行排序然后再次显示它们之后，所有这些数字都返回值＆＃34; 0＆＃34;

int[] generatedNums = new int[6]; //Array containing generated integers

 protected void BtnGenerate_Click(object sender, EventArgs e)
{

    Random newRandom = new Random();

    for (int i = 0; i < 5; i++)
    {  
        generatedNums[i] = newRandom.Next(1, 50);
    }

    lblNum1.Text = generatedNums[0].ToString();
    lblNum2.Text = generatedNums[1].ToString();
    lblNum3.Text = generatedNums[2].ToString();
    lblNum4.Text = generatedNums[3].ToString();
    lblNum5.Text = generatedNums[4].ToString();
    lblNum6.Text = generatedNums[5].ToString();

}

protected void BtnSort_Click(object sender, EventArgs e)
{
    Array.Sort(generatedNums);

    lblNum1.Text = generatedNums[0].ToString();
    lblNum2.Text = generatedNums[1].ToString();
    lblNum3.Text = generatedNums[2].ToString();
    lblNum4.Text = generatedNums[3].ToString();
    lblNum5.Text = generatedNums[4].ToString();
    lblNum6.Text = generatedNums[5].ToString();
}

我将两种方法合并为一种，它可以正常工作，有什么帮助吗？

Answer 1

您的问题是您忘记了Web服务器没有在请求之间保留generatedNums数组的状态。与大多数Web框架一样，Web窗体是无状态的。当您尝试对数组进行排序时，您需要重新生成列表或从标签中读取它。您的班级成员不会在请求之间保留。

Answer 2

您只需初始化值0 - 4

(function($) {
  var canvas = document.getElementById('canvas');
  var context = canvas.getContext('2d');

  //Detect a mouse down. Set the xy coordinates
  var mouseDown = false;

  $(canvas).mousedown(function(e) {
    mouseDown = true;
    var bounds = e.target.getBoundingClientRect()
    mouseScaleX = e.target.width / bounds.width; 
    mouseScaleY = e.target.height / bounds.height; 

    context.beginPath();
    context.moveTo(e.offsetX * mouseScaleX, e.offsetY * mouseScaleY);
  });

  //Detect that the mouse is moving and draw the line while the mouse is still down
  $(canvas).mousemove(function(e) {
    if (mouseDown) {
      var bounds = e.target.getBoundingClientRect()
      mouseScaleX = e.target.width / bounds.width; 
      mouseScaleY = e.target.height / bounds.height; 

      var x = e.offsetX * mouseScaleX;
      var y = e.offsetY * mouseScaleY;


      context.lineTo(x, y);
      context.strokeStyle = '#000';
      context.stroke();

    }
  });

  //On mouse up, reset the coordinates
  $(canvas).mouseup(function() {
    mouseDown = false;
    context.closePath();
  });

})(jQuery);

但显示0 - 5

#canvas {
  width: 400px;
  height: 400px;
  border: 1px solid;
  margin: 0 auto;
  display: block;
}

如果您展示声明generatedNums

，它也会有所帮助

Answer 3

啊，这是一个Web服务器是一个非常重要的细节并且你可以保持变量不像这样清除

private int[] generatedNums
{
    get { return (int[])HttpContext.Current.Session["generatedNums"]; }
    set { HttpContext.Current.Session["generatedNums"] = value; }
}

在您的构造函数或初始值设定项中，您可以添加此

if (generatedNums == null)
    generatedNums = new int[6];

或更好，你可以在启动服务器时设置它

使用Array.Sort（）后，C＃Array为空

3 个答案: