实现效果:

知识运用:
FileInfo类的CreationTime属性 //获取或设置当前FileInfo对象的创建时间
public DataTime CreationTime { get;set }
实现代码:
private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog P_openFileDialog = new OpenFileDialog();
if (P_openFileDialog.ShowDialog() == DialogResult.OK)
{
FileInfo f = new FileInfo(P_openFileDialog.FileName);
MessageBox.Show("文件创建日:"+
f.CreationTime.ToString(),"提示");
}
}
补充:
FileInfo类的LastWriteTime属性 // 获取文件的最后修改时间