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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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         }

代码转自IT学习广场http://www.itxxgc.com/net/detail/30

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