使用带有图片框的 foreach 循环答案

【问题标题】：Using a foreach loop with pictureboxes使用带有图片框的 foreach 循环
【发布时间】：2018-11-20 01:03:16
【问题描述】：

我正在尝试使我的代码尽可能短，并且我打算以一定的间隔从 6 张图片中为 3 个不同的图片框随机选择图片。我没有为每个图片框复制和粘贴开关和大小写三次，而是尝试在一个 foreach 循环中进行更改。我对 C# 和 windows 窗体非常陌生，因此不胜感激。编辑：很抱歉措辞不佳，但问题是程序说元素不是有效的图片框，我想知道为什么以及如果可能的话如何修复它，但感谢替代解决方案。

private void timer1_Tick(object sender, EventArgs e)
    {

        Random random = new Random();
        int picture = random.Next(1, 7);
        var pictures = new List<PictureBox> { pictureBox1, pictureBox2, pictureBox2 };
        foreach (PictureBox element in pictures)
        {
            switch (picture)
            {
                case 1:
                    this.element.Image = Image.FromFile("C:\\Users\\seanb\\OneDrive\\Pictures\\cherry.jpg");
                    break;
                case 2:
                    this.element.Image = Image.FromFile("C:\\Users\\seanb\\OneDrive\\Pictures\\bell.jpg");
                    break;
                case 3:
                    this.element.Image = Image.FromFile("C:\\Users\\seanb\\OneDrive\\Pictures\\lemon.jpg");
                    break;
                case 4:
                    this.element.Image = Image.FromFile("C:\\Users\\seanb\\OneDrive\\Pictures\\orange.jpg");
                    break;
                case 5:
                    this.element.Image = Image.FromFile("C:\\Users\\seanb\\OneDrive\\Pictures\\star.jpg");
                    break;
                case 6:
                    this.element.Image = Image.FromFile("C:\\Users\\seanb\\OneDrive\\Pictures\\skull.jpg");
                    break;
            }
        }

【问题讨论】：

你的问题到底是什么？

标签： c# image winforms foreach picturebox

【解决方案1】：

像这样使用Dictionary 怎么样：

Dictionary<int, Image> dictionary = new Dictionary<int, Image>()
{
    {1,  Image.FromFile("C:\\Users\\seanb\\OneDrive\\Pictures\\cherry.jpg")},
    {2,  Image.FromFile("C:\\Users\\seanb\\OneDrive\\Pictures\\bell.jpg")},
};

dictionary.TryGetValue(picture, out value);
if (value != null)
{
    this.element.Image = value;
}

【讨论】：

【解决方案2】：

所以你有图片：

static Image[] s_Images = new string[] {
     "cherry.jpg",
     "bell.jpg",
     "lemon.jpg", 
     "orange.jpg",
     "star.jpg", 
     "skull.jpg"}
  .Select(file => Path.Combine(@"C:\Users\seanb\OneDrive\Pictures", file))
  .Select(file => Image.FromFile(file)) 
  .ToArray();  

static Random random = new Random();

并且您想将这些图像随机分配给图片框：

private void timer1_Tick(object sender, EventArgs e) {
  foreach (PictureBox box in new PictureBox[] { pictureBox1, pictureBox2, pictureBox2 }) {
    box.Image = s_Images[random.Next(s_Images.Length)];
  }
}

【讨论】：

【解决方案3】：

Random random = new Random();
int picture = random.Next(1, 7);
var pictureBoxs = new List<PictureBox> { pictureBox1, pictureBox2, pictureBox2 };
string basePath = "C:\\Users\\seanb\\OneDrive\\Pictures\\";
string[] pictures = new string[]{ "cherry.jpg", "bell.jpg", "lemon.jpg", "orange.jpg", "star.jpg", "skull.jpg" };
foreach (PictureBox element in pictureBoxs)
{
    this.element.Image = Image.FromFile(basePath+ pictures[picture]);
}

【讨论】：

【解决方案4】：

使用Dictionary 接近

int picture = new Random().Next(1, 7);
Dictionary<int, string> dictionary = new Dictionary<int, string>()
{
    {1, "cherry.jpg"},
    {2, "bell.jpg"},
    {3, "lemon.jpg"},
    {4, "orange.jpg"},
    {5, "star.jpg"},
    {6, "skull.jpg"}
};
string res = "default.jpg";
var pictures = new List<PictureBox> { pictureBox1, pictureBox2, pictureBox2 };
string path = System.IO.Path.Combine("C:\\Users\\seanb\\OneDrive\\Pictures\\" + dictionary.TryGetValue(picture, out res));
pictures.ForEach(x => x.Image = Image.FromFile(path));

【讨论】：

【解决方案5】：

private void timer1_Tick(object sender, EventArgs e)
        {
            Random random = new Random();
            List<string> picPaths = new List<string>();
            picPaths.Add("C:\\Users\\seanb\\OneDrive\\Pictures\\cherry.jpg");
            picPaths.Add("C:\\Users\\seanb\\OneDrive\\Pictures\\bell.jpg");
            picPaths.Add("C:\\Users\\seanb\\OneDrive\\Pictures\\lemon.jpg");
            picPaths.Add("C:\\Users\\seanb\\OneDrive\\Pictures\\orange.jpg");
            picPaths.Add("C:\\Users\\seanb\\OneDrive\\Pictures\\star.jpg");
            picPaths.Add("C:\\Users\\seanb\\OneDrive\\Pictures\\skull.jpg");

            pictureBox1.Image = Image.FromFile(picPaths[random.Next(picPaths.Count)]);
            pictureBox2.Image = Image.FromFile(picPaths[random.Next(picPaths.Count)]);
            pictureBox3.Image = Image.FromFile(picPaths[random.Next(picPaths.Count)]);
        }

【讨论】：