ASP.NET中常用功能代码总结(3)——上传图片到数据库
整理:Terrylee
一.上传图片到数据库
1
/// <summary>
2
/// 上传图片
3
/// </summary>
4
private void UploadFile()
5
{
6
///得到用户要上传的文件名
7
string strFilePathName = loFile.PostedFile.FileName;
8
string strFileName = Path.GetFileName(strFilePathName);
9
int FileLength = loFile.PostedFile.ContentLength;
10
11
if(FileLength<=0)
12
return;
13
14
///上传文件
15
try
16
{
17
18
///图象文件临时储存Byte数组
19
Byte[] FileByteArray = new Byte[FileLength];
20
21
///建立数据流对像
22
Stream StreamObject = loFile.PostedFile.InputStream;
23
24
///读取图象文件数据,FileByteArray为数据储存体,0为数据指针位置、FileLnegth为数据长度
25
StreamObject.Read(FileByteArray,0,FileLength);
26
27
///建立SQL Server链接
28
string strCon = System.Configuration.ConfigurationSettings.AppSettings["DSN"];
29
SqlConnection Con = new SqlConnection(strCon);
30
String SqlCmd = "INSERT INTO ImageStore (ImageData, ImageContentType, ImageDescription, ImageSize) VALUES (@Image, @ContentType, @ImageDescription, @ImageSize)";
31
SqlCommand CmdObj = new SqlCommand(SqlCmd, Con);
32
CmdObj.Parameters.Add("@Image",SqlDbType.Binary, FileLength).Value = FileByteArray;
33
CmdObj.Parameters.Add("@ContentType", SqlDbType.VarChar,50).Value = loFile.PostedFile.ContentType; //记录文件类型
34
35
///把其它单表数据记录上传
36
CmdObj.Parameters.Add("@ImageDescription", SqlDbType.VarChar,200).Value = tbDescription.Text;
37
38
///记录文件长度,读取时使用
39
CmdObj.Parameters.Add("@ImageSize", SqlDbType.BigInt,8).Value = FileLength;
40
Con.Open();
41
CmdObj.ExecuteNonQuery();
42
Con.Close();
43
44
///跳转页面
45
Response.Redirect("ShowAll.aspx");
46
}
47
catch(Exception ex)
48
{
49
throw ex;
50
}
51
}

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

二.从数据库中读取图片
1
/// <summary>
2
/// 显示图片
3
/// </summary>
4
private void ShowImages()
5
{
6
///ID为图片ID
7
int ImgID = Convert.ToInt32(Request.QueryString["ID"]);
8
9
///建立数据库连接
10
string strCon = System.Configuration.ConfigurationSettings.AppSettings["DSN"];
11
SqlConnection Con = new SqlConnection(strCon);
12
String SqlCmd = "SELECT * FROM ImageStore WHERE ImageID = @ImageID";
13
SqlCommand CmdObj = new SqlCommand(SqlCmd, Con);
14
CmdObj.Parameters.Add("@ImageID", SqlDbType.Int).Value = ImgID;
15
16
Con.Open();
17
SqlDataReader SqlReader = CmdObj.ExecuteReader();
18
SqlReader.Read();
19
20
///设定输出文件类型
21
Response.ContentType = (string)SqlReader["ImageContentType"];
22
23
///输出图象文件二进制数制
24
Response.OutputStream.Write((byte[])SqlReader["ImageData"], 0, (int)SqlReader["ImageSize"]);
25
Response.End();
26
27
Con.Close();
28
}

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28
