将图片以二进制格式存储到数据库中
核心技术：
int FileLen = this.FileUpload1.PostedFile.ContentLength;
Byte[] FileData = new Byte[FileLen];
HttpPostedFile hp = FileUpload1.PostedFile;//创建访问客户端上传文件的对象
Stream sr = hp.InputStream;//创建数据流对象
sr.Read(FileData, 0, FileLen);//将图片数据放到FileData数组对象实例中,其中0代表数组指针的起始位置,FileLen表示要读取流的长度(指针的结素位置).....
1.前台
<table cellpadding="0" cellspacing="0" style="width: 290px">
<tr>
<td colspan="2" style="height: 30px">
<asp:Label ID="Label4" runat="server" BackColor="#C0FFFF" Font-Size="9pt" ForeColor="Black"
Text="注意：只允许保存bmp、jpg和gif类型的图片"></asp:Label></td>
</tr>
<tr>
<td style="width: 66px; height: 30px">
<asp:Label ID="Label1" runat="server" Font-Size="9pt" Text="选择图片"></asp:Label></td>
<td align="left" style="width: 100px; height: 30px">
<asp:FileUpload ID="FileUpload1" runat="server" Font-Size="9pt" /></td>
</tr>
<tr>
<td style="width: 66px; height: 30px">
</td>
<td align="left" style="width: 100px; height: 30px">
<asp:Button ID="Button1" runat="server" Font-Size="9pt" OnClick="Button1_Click" Text="保存"
Width="66px" /></td>
</tr>
<tr>
<td style="width: 66px; height: 30px">
</td>
<td align="left" style="width: 100px; height: 30px">
<asp:Label ID="Label3" runat="server" Font-Size="9pt" Width="216px"></asp:Label></td>
</tr>
</table>
2.后台
using System.IO;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
try
{
string ImgPath = FileUpload1.PostedFile.FileName;
string ImgName = ImgPath.Substring(ImgPath.LastIndexOf("\\") + 1);
string ImgExtend = ImgPath.Substring(ImgPath.LastIndexOf(".") + 1);
if (!(ImgExtend == "bmp" || ImgExtend == "jpg" || ImgExtend == "gif"))
{
Label3.Text = "上传图片的格式不正确！";
return;
}
int FileLen = this.FileUpload1.PostedFile.ContentLength;
Byte[] FileData = new Byte[FileLen];
HttpPostedFile hp = FileUpload1.PostedFile;//创建访问客户端上传文件的对象
Stream sr = hp.InputStream;//创建数据流对象
sr.Read(FileData, 0, FileLen);//将图片数据放到FileData数组对象实例中,其中0代表数组指针的起始位置,FileLen表示要读取流的长度(指针的结素位置)
SqlConnection con = new SqlConnection("server=(local);user id=sa;pwd=;database=db_07");
con.Open();
SqlCommand com = new SqlCommand("INSERT INTO tb_15 (name) VALUES (@imgdata)", con);
com.Parameters.Add("@imgdata", SqlDbType.Image);
com.Parameters["@imgdata"].Value = FileData;
com.ExecuteNonQuery();
Label3.Text = "保存成功！";
}
catch (Exception error)
{
Label3.Text = "处理失败！原因为：" + error.ToString();
}
}
}
读取并显示数据库中二进制图片
核心技术：
using System.Data.SqlClient;
using System.IO;
using System.Drawing;
.....
MemoryStream ms = new MemoryStream((Byte[])dr["name"]);
Bitmap image = new Bitmap(ms);
string filepath = Server.MapPath("Files/");
DirectoryInfo dir = new DirectoryInfo(filepath);
FileInfo[] filecount = dir.GetFiles();
int i = filecount.Length;
imagename = filepath + ((i + 1) + ".jpg");
image.Save(imagename);
1.前台
<table cellpadding="0" cellspacing="0" style="width: 214px">
<tr>
<td style="width: 45px; height: 30px"></td>
<td align="left" style="width: 130px; height: 30px">
<asp:Button ID="Button1" runat="server" Font-Size="9pt" OnClick="Button1_Click" Text="读取并显示"
Width="100px" /></td>
</tr>
<tr>
<td style="width: 45px; height: 30px">
<asp:Label ID="Label1" runat="server" Font-Size="9pt" Text="记录编号" Width="52px"></asp:Label></td>
<td align="left" style="width: 130px; height: 30px">
<asp:DropDownList ID="DropDownList1" runat="server" Width="100px"></asp:DropDownList></td>
</tr>
<tr>
<td style="width: 45px; height: 120px"></td>
<td style="width: 130px; height: 120px; text-align: left"><asp:Image ID="Image1" runat="server" /></td>
</tr>
</table>
2.后台
using System.Data.SqlClient;
using System.IO;
using System.Drawing;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
SqlConnection con = new SqlConnection("server=(local);user id=sa;pwd=;database=db_07");
SqlDataAdapter ada = new SqlDataAdapter("select * from tb_17 ", con);
con.Open();
DataSet ds = new DataSet();
ada.Fill(ds);
DropDownList1.DataSource = ds;
DropDownList1.DataTextField = "id";
DropDownList1.DataValueField = "id";
DropDownList1.DataBind();
Image1.Visible=false;
}
}
protected void Button1_Click(object sender, EventArgs e)
{
Image1.Visible = true;
SqlConnection con = new SqlConnection("server=(local);user id=sa;pwd=;database=db_07");
string imagename = "";
try
{
con.Open();
SqlCommand com = new SqlCommand("select name from tb_17 where id="+DropDownList1.Text+"", con);
SqlDataReader dr = com.ExecuteReader();
dr.Read();
MemoryStream ms = new MemoryStream((Byte[])dr["name"]);
Bitmap image = new Bitmap(ms);
string filepath = Server.MapPath("Files/");
DirectoryInfo dir = new DirectoryInfo(filepath);
FileInfo[] filecount = dir.GetFiles();
int i = filecount.Length;
imagename = filepath + ((i + 1) + ".jpg");
image.Save(imagename);
dr.Close();
Image1.ImageUrl = "Files/" + ((i + 1) + ".jpg");
}
finally
{
con.Close();
}
}
}