C#(WinForm)上传图片保存到数据库和从数据库读取图片显示到窗体

  1 //浏览图片
  2  
  3         private void btnUp_Click(object sender, EventArgs e)
  4  
  5         {
  6  
  7             OpenFileDialog ofd = new OpenFileDialog();
  8  
  9             ofd.Title = "选择要上传的图片";
 10  
 11             ofd.Filter = "All Files(*.*)|*.*|位图(*.bmp)|*.bmp|JPEG(*.jpg)|*.jpg";
 12  
 13             ofd.ShowDialog();
 14  
 15             textBox1.Text = ofd.FileName;
 16  
 17             if (!File.Exists(ofd.FileName))
 18  
 19             {
 20  
 21                 MessageBox.Show("照片为空");
 22  
 23                 return;
 24  
 25             }
 26  
 27         }
 28  
 29   
 30  
 31   
 32  
 33         //上传保存到数据库
 34  
 35         private void btnUpLoad_Click(object sender, EventArgs e)
 36  
 37         {
 38  
 39             string strPath = txtbImage.Text.Trim();
 40  
 41             FileStream fs = new FileStream(strPath, FileMode.Open, FileAccess.Read);
 42  
 43             byte[] byteFile = new byte[fs.Length];
 44  
 45             fs.Read(byteFile, 0, (int)fs.Length);
 46  
 47             fs.Close();
 48  
 49             SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=Test;Integrated Security=True");
 50  
 51                 try
 52  
 53                 {
 54  
 55                     SqlCommand cmd = new SqlCommand();
 56  
 57                     cmd.Connection = conn;
 58  
 59   
 60  
 61                     string strSql = "insert into test(FileName,Img) Values(@FileName,@Img)";
 62  
 63                     cmd.CommandText =strSql ;
 64  
 65                     //cmd.Parameters.AddWithValue("@FileName", strPath);
 66  
 67                     //cmd.Parameters.AddWithValue("@Img", byteFile);
 68  
 69                     //或者
 70  
 71                     SqlParameter[] parameters = new SqlParameter[2];
 72  
 73                     parameters[0] = new SqlParameter("@FileName", SqlDbType.NVarChar, 200);
 74  
 75                     parameters[0].Value = strPath;
 76  
 77                     parameters[1] = new SqlParameter("@Img", SqlDbType.Image,int.MaxValue);
 78  
 79                     parameters[1].Value = byteFile;
 80  
 81                     cmd.Parameters.AddRange(parameters);
 82  
 83                     conn.Open();
 84  
 85                     cmd.ExecuteNonQuery();
 86  
 87                     conn.Close();
 88  
 89                     MessageBox.Show("上传成功");
 90  
 91                 }
 92  
 93                 catch
 94  
 95                 {
 96  
 97                     conn.Close();
 98  
 99                     MessageBox.Show("上传失败！");
100  
101                 }
102  
103         }
104 
105 从数据库读取图片显示到窗体：
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177 72
178 73
179 //读到图片显示到PictureBox
180  
181         private void btnDownLoad_Click(object sender, EventArgs e)
182  
183         {
184  
185             byte[] bytFile;
186  
187             SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=Test;Integrated Security=True");
188  
189                 try
190  
191                 {
192  
193                     SqlCommand cmd = new SqlCommand();
194  
195                     string strSql = "select img from test where ID=3";
196  
197                     cmd.Connection = conn;
198  
199                     cmd.CommandText = strSql;
200  
201                     conn.Open();
202  
203                     SqlDataReader sdr = cmd.ExecuteReader();
204  
205                     if (sdr.Read())
206  
207                     {
208  
209                         bytFile = (Byte[])sdr["Img"];
210  
211                     }
212  
213                     else
214  
215                     {
216  
217                         bytFile = new byte[0];
218  
219                     }
220  
221                     sdr.Close();
222  
223                     conn.Close();
224  
225                     //通过内存流MemoryStream，
226  
227                     //把byte[]数组fileContent加载到Image中并赋值给图片框的Image属性，
228  
229                     //让数据库中的图片直接显示在窗体上。
230  
231                     MemoryStream ms = new MemoryStream(bytFile, 0, bytFile.Length);
232  
233                     this.picImage.Image = Image.FromStream(ms);
234  
235                     //关闭内存流
236  
237                     ms.Close();
238  
239                 }
240  
241                 catch
242  
243                 {
244  
245                     conn.Close();
246  
247                     MessageBox.Show("失败");
248  
249                 }
250  
251         }