c# 自动与手动保存图片的代码

private void Autosave()
{
string Opath =@"D:VedioCapturePhoto";
string photoname = DateTime.Now.Ticks.ToString();
if (Opath.Substring(Opath.Length-1, 1) != @"")
Opath = Opath + @"";
string path1 = Opath + DateTime.Now.ToShortDateString();
if (! Directory.Exists(path1))
Directory.CreateDirectory(path1);
//pictureBox1.Image.Save(path1 +"" + photoname + ".jpg",System.Drawing.Imaging.ImageFormat.Jpeg);
//图像的缩小
System.Drawing.Bitmap objPic,objNewPic;
try
{
objPic = new System.Drawing.Bitmap(pictureBox1.Image);
objNewPic=new System.Drawing.Bitmap(objPic,pictureBoxShow.Width,pictureBoxShow.Height);
//objNewPic=new System.Drawing.Bitmap(objPic,320,240);//图片保存的大小尺寸
objNewPic.Save(path1 +"" + photoname + ".jpg",System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch(Exception exp){throw exp;}
finally
{
objPic=null;
objNewPic=null;
}
}

private void saveBtn_Click(object sender, System.EventArgs e)
{
bool isSave = true;
SaveFileDialog saveImageDialog = new SaveFileDialog();
saveImageDialog.Title = "图片保存";
saveImageDialog.Filter= @"jpeg|*.jpg|bmp|*.bmp|gif|*.gif";

if(saveImageDialog.ShowDialog() == DialogResult.OK)
{
string fileName = saveImageDialog.FileName.ToString();

if(fileName != "" && fileName != null)
{
string fileExtName = fileName.Substring(fileName.LastIndexOf(".")+1).ToString();

System.Drawing.Imaging.ImageFormat imgformat = null;

if(fileExtName!="")
{
switch(fileExtName)
{
case "jpg":
imgformat = System.Drawing.Imaging.ImageFormat.Jpeg;
break;
case "bmp":
imgformat = System.Drawing.Imaging.ImageFormat.Bmp;
break;
case "gif":
imgformat = System.Drawing.Imaging.ImageFormat.Gif;
break;
default:
MessageBox.Show("只能存取为: jpg,bmp,gif 格式");
isSave = false;
break;
}
}

//默认保存为JPG格式
if(imgformat == null)
{
imgformat = System.Drawing.Imaging.ImageFormat.Jpeg;
}

if(isSave)
{
try
{
this.pictureBox1.Image.Save(fileName,imgformat);
//MessageBox.Show("图片已经成功保存!");
}
catch
{
MessageBox.Show("保存失败,你还没有截取过图片或已经清空图片!");
}
}
}
}
}