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
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1.将图片以二进制存入数据库
--------------------------
//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
--------------------------
//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
---------------------------------------------
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
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;
    }   
}