声明:基础知识来自于此:http://blog.163.com/chenjunfeng_2007/blog/static/119385083201019102742570/
一、打开:
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.IO;
namespace WindowsFormsApplication5 { public partial class Form1 : Form { public Form1() { InitializeComponent(); }
/*用ToolStripMenuItem实现打开本地图片*/
private void 打开ToolStripMenuItem_Click(object sender, EventArgs e) { String picPath; //filter写法,"打开对话框下部索要显示内容|真正的过滤后缀名" openFileDialog1.Filter = "图片文件(jpg,jpeg,bmp,gif,ico,pen,tif)|*.jpg;*.jpeg;*.bmp;*.gif;*.ico;*.png;*.tif;*.wmf"; openFileDialog1.ShowDialog(); picPath = openFileDialog1.FileName; if(File.Exists(picPath)) { pictureBox1.Image = Image.FromFile(picPath); } }
/*用ToolStripMenuItem实现打开本地图片*/
private void 保存ToolStripMenuItem_Click(object sender, EventArgs e) { //Stream FileStream; SaveFileDialog saveImageDialog = new SaveFileDialog(); saveImageDialog.Title = "保存文件实例"; saveImageDialog.Filter = @"jpeg|*.jpg|bmp|*.bmp|gif|*.gif";
saveImageDialog.ShowDialog();
if (saveImageDialog.FileName != null) { //System.IO.Stream fs = (System.IO.Stream)saveImageDialog.OpenFile(); //FileStream filestream = new FileStream(openFileDialog1.FileName.ToString(),FileMode.Open,FileAccess.Read); String fileName = saveImageDialog.FileName.ToString();
if(fileName!="" && fileName!=null) {
/*该字符串中的每个字符都被认为具有数字位置:第一个字符的位置是 1,第二个字符的位置是 2,依此类推。
如果未指定第三个参数,将返回从第二个参数指定的位置开始直到字符串结尾的子字符串。
如果参数不是字符串类型,将先使用 string() 函数转换为字符串,然后计算该转换的结果。 substring("12345",2,3) ---->(234) substring("12345",2) ------>(2345)*/
/*此处用fileExtName作为switch语句的开关项,但有编译期错误*/
String fileExtName = fileName.Substring(fileName.LastIndexOf(".") , 1).ToString() ; System.Drawing.Imaging.ImageFormat imageformat= null;
if(fileExtName!=null) { switch(saveImageDialog.FilterIndex) { case 1: imageformat=System.Drawing.Imaging.ImageFormat.Jpeg; break; case 2: imageformat=System.Drawing.Imaging.ImageFormat.Bmp; break; } if(imageformat==null) { imageformat = System.Drawing.Imaging.ImageFormat.Jpeg; }
try { this.pictureBox1.Image.Save(fileName,imageformat); } catch { MessageBox.Show("sorry,保存图片出现异常"); } } } } }
} }
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