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：
106 1
107 2
108 3
109 4
110 5
111 6
112 7
113 8
114 9
115 10
116 11
117 12
118 13
119 14
120 15
121 16
122 17
123 18
124 19
125 20
126 21
127 22
128 23
129 24
130 25
131 26
132 27
133 28
134 29
135 30
136 31
137 32
138 33
139 34
140 35
141 36
142 37
143 38
144 39
145 40
146 41
147 42
148 43
149 44
150 45
151 46
152 47
153 48
154 49
155 50
156 51
157 52
158 53
159 54
160 55
161 56
162 57
163 58
164 59
165 60
166 61
167 62
168 63
169 64
170 65
171 66
172 67
173 68
174 69
175 70
176 71
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 ;
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

来自凌波小屋-----冯和超的笔记-------