隐藏数组图片框c#

Question

这会生成一个图片框

PictureBox[][] picturebox;

public void loadPictureBox()
{
    string path = @"../../Images/Catelogue/"; //set pathing
    string[] list = Directory.GetFiles(path, "*.jpg");
    //pictureboxCatelogue = new PictureBox[list.Length];
    //pictureboxCosplay = new PictureBox[list.Length];

    picturebox = new PictureBox[4][];

    for (int i = 0; i < 4; i++)
    {
        picturebox[i] = new PictureBox[list.Length];

        int y = 85, temp = 220, run = 0;
        for (int index = 13; index < list.Length; index++) // loads all pictures and create pictureboxes
        {
            picturebox[i][index] = new PictureBox();
            picturebox[i][index].Image = Image.FromFile(path + index + ".jpg");

            this.Controls.Add(picturebox[i][index]);
            temp = temp + 200;

            if (index % 4 == 0)
            {
                if (run != 0)
                    y = y + 200;
                run++;
                temp = 220;
            }

            picturebox[i][index].Location = new Point(temp, y);
            picturebox[i][index].Size = new Size(180, 180);
            picturebox[i][index].Name = Convert.ToString(index);
            picturebox[i][index].SizeMode = PictureBoxSizeMode.Zoom;
            picturebox[i][index].BackColor = Color.FromArgb(35, 35, 35);
            picturebox[i][index].Click += new System.EventHandler(PictureBox_Click);
        }
    }
}

我试图隐藏一个锯齿状数组，它是 winform c# 中的图片框，但我不断收到错误消息，是否可以隐藏锯齿状数组？这是我遇到问题的代码。

for (int i = 0; i < picturebox.Length; i++)
{
    picturebox[0][i].Hide();
}

这是我得到的错误

错误：APPD 分配 2.exe 中出现“System.NullReferenceException”类型的第一次机会异常（附加信息：对象引用未设置为对象的实例。）

Answer 1

你不是在这里用错了长度吗？

for (int i = 0; i < picturebox.Length; i++)

应该是

for (int i = 0; i < picturebox[0].Length; i++)

当你加载图片框时，你只是从索引 13 开始，所以你要么需要在 13 开始隐藏循环，要么检查 null。

for (int i = 13; i < picturebox[0].Length; i++)
{ ... }

或

for (int i = 0; i < picturebox[0].Length; i++)
{
    if (picturebox[0][i] != null) 
    {
        picturebox[0][i].Hide();
    }
}