c# - C#显示多张图片

Question

我已经编写了代码来使用 PictureBox 显示多张图像(100 张图像)，但是当运行该应用程序时，只显示了一张图像...

请大家帮帮我...

这是我的代码:

    Random r = new Random();

    private  int randomPoint()
    {

        return 1 + r.Next() % 15;

    }

    // x0, y0
    private int[] initialLocation = new int[2];

    private void setLocation(int i)
    {
        int x0 = 50, y0=50;

        initialLocation[1] = y0;
        switch (i)
        {
            case 1: initialLocation[0] = x0;
                break;

            case 2: initialLocation[0] = x0 + 50;
                break;

            case 3: initialLocation[0] = x0 + 100;
                break;

            case 4: initialLocation[0] = x0 + 150;
                break;

            case 5: initialLocation[0] = x0 + 200;
                break;

            case 6: initialLocation[0] = x0 + 250;
                break;

            case 7: initialLocation[0] = x0 + 300;
                break;

            case 8: initialLocation[0] = x0 + 350;
                break;

            case 9: initialLocation[0] = x0 + 400;
                break;

            case 10: initialLocation[0] = x0 + 450;
                break;

        }

    }

    public Form1()
    {
        InitializeComponent();

        PictureBox[] p = new PictureBox[10];


        for (int i=0; i<10;i++)  
        {

            p[i] = new PictureBox();
            p[i].ImageLocation = "1.png";

            int[] l = new int[2];

            // create random location for images
            setLocation(randomPoint());

            p[i].Location = new Point(initialLocation[0], initialLocation[1]);

            this.Controls.Add(p[i]);
        }
   }

Answer 1

这是因为您每次需要图像时都在声明随机数生成器:

private  int randomPoint()
{
    Random r = new Random();

    return 1 + r.Next() % 15;
}

将其替换为:

private Random r = new Random();

private  int randomPoint()
{
    return 1 + r.Next() % 15;
}

更新

如果我没理解错的话，您希望在整个表单中以随机顺序显示 15 张图像。

为确保您不会得到任何重复，您需要确保在选择下一张之前从列表中删除您选择的图片。所以(在伪代码中)你需要这样的东西:

this.folderList = new List<string>();
// Populate it in an orderly manner

// Create temporary list to put the randomly selected items into
var radomisedList = new List<string>();

// Randomise the list.
var random = new Random();
int num = 0;

while (this.folderList.Count > 0)
{
    num = random.Next(0, this.folderList.Count);
    radomisedList.Add(this.folderList[num]);
    this.folderList.RemoveAt(num);
}

这将确保您获得随机订单且不会重复。