Question

C#用imageList控件实现图片切换上下张

共有8张图片存放在imageList1，显示在pictureBox1
button2换下一张，button1上一张，到尾端会跳回第一张
我是这样写的，但顺序会出错

int i = 0;
private void button2_Click(object sender, EventArgs e)
{

pictureBox1.Image = imageList1.Images[i];
i++;
if (i>= imageList1.Images.Count)i=0;
}

private void button1_Click(object sender, EventArgs e)
{
pictureBox1.Image = imageList1.Images[i];
i--;
if (i >= imageList1.Images.Count) i = 0;
if (i < 0) i = 7;

只能使用imageList控件，请求指点

Answer 1

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
int i = -1;
public Form1()
{
InitializeComponent();
}

//上一张按钮
private void button1_Click(object sender, EventArgs e)
{
if (i == 0)
{
i = imageList1.Images.Count - 1;
pictureBox1.Image = imageList1.Images[i];
}
else
{
i--;
pictureBox1.Image = imageList1.Images[i];
}
}

//下一张按钮
private void button2_Click(object sender, EventArgs e)
{
if (i == imageList1.Images.Count - 1)
{
i = 0;
pictureBox1.Image = imageList1.Images[i];
}
else
{
i++;
pictureBox1.Image = imageList1.Images[i];
}
}
}
}