Question

C#如何编程实现打开一张图片并保存在指定的位置

C#窗口应用程序如何编程实现打开一张图片并保存在指定的位置

Answer 1

using System; 
using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; 
using System.Windows.Forms; using System.IO; 
using System.Data.SqlClient; using System.Drawing.Imaging;   
namespace Card { 
    public partial class Form1 : Form     { 
        public Form1()         { 
            InitializeComponent();         }  
        private void btnImage_Click(object sender, EventArgs e)         { 
            OpenFileDialog of = new OpenFileDialog(); 
            of.Filter = "*.bmp;*.jpg;*.gif|*.bmp;*.jpg;*.gif;*.jpeg";  
            of.ShowDialog(); 
            txt_image.Text = of.FileName;             string filePath = of.FileName;             
            if (!File.Exists(of.FileName))             { 
                MessageBox.Show("不能为空");                 return;             }  
        }  
        private void button1_Click(object sender, EventArgs e)         { 
           string xlh = textBox1.Text.Trim();            string dwmc = textBox2.Text.Trim();            string jbry = textBox3.Text.Trim();            string sfz = textBox4.Text.Trim(); 
           string strPath = txt_image.Text.Trim();                      
            //截取图片的名字 
           string loadName = strPath.Substring(strPath.LastIndexOf("\\") + 1);  
            FileStream fs = new FileStream(strPath, FileMode.Open, FileAccess.Read);  
            byte[] byteFile = new byte[fs.Length];             fs.Read(byteFile, 0, (int)fs.Length);             fs.Close();              try                 { 
                   this.picImage.SizeMode = PictureBoxSizeMode.Normal; 
                   this.picImage.Image = System.Drawing.Image.FromFile(strPath);                                      }  
           catch   (Exception   ex)                 {  
               MessageBox.Show(ex.Message);                 }     
            SqlConnection conn = new SqlConnection("Data 
Source=USER-7836C6117D\\SQLEXPRESS;Initial Catalog=Card;uid=sa;pwd=123");            try            { 
                SqlCommand cmd = new SqlCommand();                 cmd.Connection = conn;                 conn.Open();  
                string strSql = "insert into card(xlh,dwmc,jbry,sfz,qzyj,img) values(@xlh,@dwmc,@jbry,@sfz,@qzyj,@img) ";                  
                cmd.CommandText = strSql;                 
                SqlParameter[] parameters = new SqlParameter[6];  
                parameters[0] = new SqlParameter("@xlh", SqlDbType.Int, 4);  
                parameters[0].Value = xlh;  
                parameters[1] = new SqlParameter("@dwmc", SqlDbType.VarChar, 100);
                parameters[1].Value = dwmc;   
                parameters[2] = new SqlParameter("@jbry", SqlDbType.VarChar, 100);  
                parameters[2].Value = dwmc;  
                parameters[3] = new SqlParameter("@sfz", SqlDbType.VarChar, 50);  
                parameters[3].Value = sfz;  
                parameters[4] = new SqlParameter("@qzyj", SqlDbType.VarChar, 50);  
                parameters[4].Value = loadName;  
                parameters[5] = new SqlParameter("@img", SqlDbType.Image, 16);  
                parameters[5].Value = byteFile;    
                cmd.Parameters.AddRange(parameters);   
                
                int i = cmd.ExecuteNonQuery();                 if (i > 0)                 {                    
                    MessageBox.Show("上传成功");                 }            }            
          catch(Exception)           {   
              conn.Close(); 
              MessageBox.Show("上传失败");            }  
        }  
        /* private void btnDownLoad_Click(object sender, EventArgs e)         {  
            byte[] bytFile; 
            SqlConnection conn = new SqlConnection("Data 
Source=USER-7836C6117D\\SQLEXPRESS;Initial Catalog=Card;uid=sa;pwd=123");  
            //try             //{  
                SqlCommand cmd = new SqlCommand();  
                string strSql = "select img from card "   
                cmd.Connection = conn;  
                cmd.CommandText = strSql;  
                conn.Open();                   
            
                SqlDataReader sdr = cmd.ExecuteReader();  
                if (sdr.Read())                 { 
                     bytFile = (Byte[])sdr["img"];   
                   // bytFile = System.Text.Encoding.ASCII.GetString (sdr["img"]);                    // bytFile = System.Text.Encoding.Unicode.GetBytes("img");                                    }  
                else                {  
                   bytFile = new byte[0];  
               }  
                sdr.Close();  
               conn.Close();//通过内存流MemoryStream，  
                //把byte[]数组fileContent加载到Image中并赋值给图片框的Image属性，  
                //让数据库中的图片直接显示在窗体上。   
                MemoryStream ms = new MemoryStream(bytFile, 0, bytFile.Length);                 Image img = Image.FromStream(ms,true);                 this.picImage.Image = img;                
                //关闭内存流  
                ms.Close();  
          //  }  
          // // catch           //  {  
            //    conn.Close();  
            //    MessageBox.Show("失败");  
              
        }         */      } }

Answer 2

可以使用控件SaveFileDialog实现；
参考例子如下：
#region 保存对话框
private void ShowSaveFileDialog()
{
//string localFilePath, fileNameExt, newFileName, FilePath;
SaveFileDialog sfd = new SaveFileDialog();
//设置文件类型
sfd.Filter = "数据库备份文件（*.bak）|*.bak|数据文件（*.mdf）|*.mdf|日志文件（*.ldf）|*.ldf";
//设置默认文件类型显示顺序
sfd.FilterIndex = 1;
//保存对话框是否记忆上次打开的目录
sfd.RestoreDirectory = true;
//点了保存按钮进入
if (sfd.ShowDialog() == DialogResult.OK)
{
string localFilePath = sfd.FileName.ToString(); //获得文件路径
string fileNameExt = localFilePath.Substring(localFilePath.LastIndexOf("//") + 1); //获取文件名，不带路径
//获取文件路径，不带文件名
//FilePath = localFilePath.Substring(0, localFilePath.LastIndexOf("//"));
//给文件名前加上时间
//newFileName = DateTime.Now.ToString("yyyyMMdd") + fileNameExt;
//在文件名里加字符
//saveFileDialog1.FileName.Insert(1,"dameng");
//System.IO.FileStream fs = (System.IO.FileStream)sfd.OpenFile();//输出文件
////fs输出带文字或图片的文件，就看需求了
}
}
#endregion