C# 利用OpenFileDialog顯示圖片於pictureBox1

利用OpenFileDialog顯示圖片於pictureBox1
pictureBox1的寬及高決定於圖片來源大小

private void btnOpen_Click(object sender, EventArgs e)
{
    OpenFileDialog openFileDialog = new OpenFileDialog();
    openFileDialog.Filter = "BMP(*.BMP)|*.bmp|" + "所有檔案|*.*";
    if (openFileDialog.ShowDialog() == DialogResult.OK)
    {
        pictureBox1.Width = Image.FromFile(openFileDialog.FileName).Width;
        pictureBox1.Height = Image.FromFile(openFileDialog.FileName).Height;
        pictureBox1.Image = Image.FromFile(openFileDialog.FileName);
    }
}