namespace 照片
{
??? public partial class Form1 : Form
??? {
??????? public Form1 ()
??????? {
??????????? InitializeComponent();
??????? }
??????? //獲得文件夾中所有圖片文件的全路徑
??????? string [] path = Directory.GetFiles( @"C:\Users\yn\Pictures\C#\" );
??????? int i = 0 ;
??????? //下一張
??????? private void button2_Click ( object sender, EventArgs e)
??????? {
??????????? //每點一下，i++，path[i]指向下一張圖片
??????????? i++;
??????????? if (i>path.Length- 1 )
??????????? {
??????????????? i = 0 ; //到最后一張，返回第一張
??????????? }
??????????? pictureBox1.Image = Image.FromFile(path[i]);
??????? }
??????? //上一張
??????? private void button1_Click ( object sender, EventArgs e)
??????? {
??????????? i--;
??????????? if (i< 0 )
??????????? {
??????????????? i = path.Length- 1 ;
??????????? }
??????????? pictureBox1.Image = Image.FromFile(path[i]);
??????? }

??????? private void Form1_Load ( object sender, EventArgs e)
??????? {
??????????? //窗體加載時，顯示一張圖片
??????????? pictureBox1.Image = Image.FromFile( @"C:\Users\yn\Pictures\C#\31113.png" );
??????? }
??? }
}

總結

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