//显示图片
private void button1_Click(object sender, EventArgs e)
{
pictureBox1.Image = Image.FromFile(@"f:\demo.gif");
}
//不显示图片
private void button2_Click(object sender, EventArgs e)
{
pictureBox1.Image = null;
}究其原因应是Image属性值设置为null，但资源仍未释放，需等垃圾回收器回收，那我们就手动释放资源再测试下：
//显示图片
private void button1_Click(object sender, EventArgs e)
{
pictureBox1.Image = Image.FromFile(@"f:\demo.gif");
}
//不显示图片并释放资源
private void button2_Click(object sender, EventArgs e)
{
Image image = pictureBox1.Image;
pictureBox1.Image = null;
image.Dispose();
}终于可以删除了！但如果图片在使用中时试图删除图片，上边代码又不行了，解决方法是将本地图片读到内存流(相当于复制一份图片)，再将内存流转化为Image对象并绑定到PictureBox的Image属性，这样原图可正常删除，代码如下：
//显示图片
private void button1_Click(object sender, EventArgs e)
{
pictureBox1.Image = GetFile(@"f:\demo.gif");
}
//不显示并释放资源
private void button2_Click(object sender, EventArgs e)
{
Image image = pictureBox1.Image;
pictureBox1.Image = null;
image.Dispose();
}
/// <summary>
/// 将文件转为内存流
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
private MemoryStream ReadFile(string path)
{
if (!File.Exists(path))
return null;
using (FileStream file = new FileStream(path, FileMode.Open))
{
byte[] b = new byte[file.Length];
file.Read(b, 0, b.Length);
MemoryStream stream = new MemoryStream(b);
return stream;
}
}
/// <summary>
/// 将内存流转为图片
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
private Image GetFile(string path)
{
MemoryStream stream = ReadFile(path);
return stream == null ? null : Image.FromStream(stream);
}
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