//点击预览原图-上张
private void PictureBoxLast_photo_Click(object sender, EventArgs e)
{
if (this.pictureBox_photoLast.Image == null)
{
MessageBox.Show("无上张照片可预览", "温馨提示");
return;
}
if (previewForm != null)
{
previewForm.Dispose();
previewForm = null;
}
previewForm = new PreviewForm(this.pictureBox_photoLast.Image, this.groupBox_photoPreviewLast.Text);
previewForm.ShowDialog();
}