图片的二进制数据库存储和显示

1.将图片以二进制存入数据库
2.读取二进制图片在页面显示
3.设置Image控件显示从数据库中读出的二进制图片
4.GridView中ImageField以URL方式显示图片
5.GridView显示读出的二进制图片
6.用ashx显示图片

1.将图片以二进制存入数据库

C#
--------------------------
//保存图片到数据库
protected void Button1_Click(object sender, EventArgs e)
{
    //图片路径
    string strPath = "~/photo/03.JPG";
    string strPhotoPath = Server.MapPath(strPath);
    //读取图片
    FileStream fs = new System.IO.FileStream(strPhotoPath, FileMode.Open, FileAccess.Read);
    BinaryReader br = new BinaryReader(fs);
    byte[] photo = br.ReadBytes((int)fs.Length);
    br.Close();
    fs.Close();
    //存入
    SqlConnection myConn = new SqlConnection("Data Source=127.0.0.1;Initial Catalog=TestDB;User ID=sa;Password=sa");
    string strComm = " INSERT INTO personPhoto(personName, personPhotoPath, personPhoto) ";
    strComm += " VALUES('wangwu', '" + strPath + "', @photoBinary )";
    SqlCommand myComm = new SqlCommand(strComm, myConn);
    myComm.Parameters.Add("@photoBinary", SqlDbType.Binary,photo.Length);
    myComm.Parameters["@photoBinary"].Value = photo;
    myConn.Open();
    myComm.ExecuteNonQuery();
    myConn.Close();
}
2.读取二进制图片在页面显示

C#
--------------------------
//读取图片
SqlConnection myConn = new SqlConnection("Data Source=127.0.0.1;Initial Catalog=TestDB;User ID=sa;Password=sa");
string strComm = " SELECT personPhoto FROM personPhoto WHERE personName='wangwu' ";
SqlCommand myComm = new SqlCommand(strComm, myConn);
myConn.Open();
SqlDataReader dr = myComm.ExecuteReader();
while (dr.Read())
{
    byte[] photo = (byte[])dr["personPhoto"];
    this.Response.BinaryWrite(photo);
}
dr.Close();
myConn.Close();

或

SqlConnection myConn = new SqlConnection("Data Source=127.0.0.1;Initial Catalog=TestDB;User ID=sa;Password=sa");
SqlDataAdapter myda = new SqlDataAdapter(" SELECT personPhoto FROM personPhoto WHERE personName='wangwu' ", myConn);
DataSet myds = new DataSet();
myConn.Open();
myda.Fill(myds);
myConn.Close();
//
byte[] photo = (byte[])myds.Tables[0].Rows[0]["personPhoto"];
this.Response.BinaryWrite(photo);

3.设置Image控件显示从数据库中读出的二进制图片

C#
---------------------------------------------
SqlConnection myConn = new SqlConnection("Data Source=192.168.0.36;Initial Catalog=TestDB;User ID=sa;Password=sa");
SqlDataAdapter myda = new SqlDataAdapter(" SELECT personPhoto FROM personPhoto WHERE personName='wangwu' ", myConn);
DataSet myds = new DataSet();
myConn.Open();
myda.Fill(myds);
myConn.Close();
//
byte[] photo = (byte[])myds.Tables[0].Rows[0]["personPhoto"];
//图片路径
string strPath = "~/photo/wangwu.JPG";
string strPhotoPath = Server.MapPath(strPath);
//保存图片文件
BinaryWriter bw = new BinaryWriter(File.Open(strPhotoPath,FileMode.OpenOrCreate));
bw.Write(photo);
bw.Close();
//显示图片
this.Image1.ImageUrl = strPath

4.GridView中ImageField以URL方式显示图片
----------------------------
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
    <Columns>
        <asp:BoundField DataField="personName" HeaderText="姓名" />
        <asp:ImageField DataImageUrlField="personPhotoPath"
            HeaderText="图片">
        </asp:ImageField>
    </Columns>
</asp:GridView>
后台直接绑定即可

5.GridView显示读出的二进制图片
------------------------------
//样板列
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowDataBound="GridView1_RowDataBound">
    <Columns>
        <asp:BoundField DataField="personName" HeaderText="姓名" />
        <asp:ImageField DataImageUrlField="personPhotoPath"
            HeaderText="图片">
        </asp:ImageField>
        <asp:TemplateField HeaderText="图片">
            <ItemTemplate>
                <asp:Image ID="Image1" runat="server" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

//绑定

C#
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowIndex < 0)
        return;
    // System.ComponentModel.Container
    string strPersonName = (string)DataBinder.Eval(e.Row.DataItem, "personName");
    Image tmp_Image = (Image)e.Row.Cells[2].FindControl("Image1");
    if (!System.Convert.IsDBNull(DataBinder.Eval(e.Row.DataItem, "personPhoto")))
    {
        //
        byte[] photo = (byte[])DataBinder.Eval(e.Row.DataItem, "personPhoto");
        //图片路径
        string strPath = "~/photo/" + strPersonName.Trim() + ".JPG";
        string strPhotoPath = Server.MapPath(strPath);
        //保存图片文件
        BinaryWriter bw = new BinaryWriter(File.Open(strPhotoPath, FileMode.OpenOrCreate));
        bw.Write(photo);
        bw.Close();
        //显示图片
        tmp_Image.ImageUrl = strPath;
    }   
}

6.用ashx显示调用图片
(1)aspx页面代码

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowDataBound="GridView1_RowDataBound">
                    <Columns>
                        <asp:BoundField DataField="ID" HeaderText="ID" />
                        <asp:TemplateField HeaderText="图片">
                            <ItemTemplate>
                                <asp:Image ID="Image1" runat="server" />
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="圖片">
                        <ItemTemplate>
                        <img src='<%# "GetImage.ashx?id="+ DataBinder.Eval(Container.DataItem,"id")%>' />
                        </ItemTemplate>
                        </asp:TemplateField>
                    </Columns>
                </asp:GridView>
(2).GetImage.ashx代码

<%@ WebHandler Language="C#" Class="GetImage" %>

using System;
using System.Web;
using System.IO;
using System.Drawing;
using System.Data.SqlClient;

public class GetImage : IHttpHandler {
   
    public void ProcessRequest (HttpContext context) {
        //context.Response.ContentType = "text/plain";
        //context.Response.Write("Hello World");
        string id = (string)context.Request["id"];
       
        MemoryStream stream = new MemoryStream();
        SqlConnection conn = new SqlConnection(@"server=.;database=DBNAME;uid=sa;pwd=sa");
        Bitmap bm = null;
        Image image = null;
        try
        {
            conn.Open();
            SqlCommand cmd = new SqlCommand("select photo from table2 where id='" + id + "'", conn);
            byte[] blob = (byte[])cmd.ExecuteScalar();

            context.Response.ContentType = "image/gif";
            context.Response.BinaryWrite(blob);
            context.Response.End();

            #region
            /*
            stream.Write(blob, 78, blob.Length - 78);
            bm = new Bitmap(stream);

            int width = 48;
            int height = (int)(width * ((double)bm.Height / (double)bm.Width));

            // getthumbnailimage生成缩略图
            image = bm.GetThumbnailImage(width, height, null, IntPtr.Zero);

            context.Response.ContentType= "image/jpeg";

            image.Save(context.Response.OutputStream,System.Drawing.Imaging.ImageFormat.Jpeg);
             */
            #endregion
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
        finally
        {
            if (image != null)
                image.Dispose();
            if (bm != null)
                bm.Dispose();
            stream.Close();
            conn.Close();
           
        }
       
    }

    public bool IsReusable {
        get {
            return false;
        }
    }
   
   

}