这里值得一提的是，web控件image不像winForm控件那样可以通过读取二进制流赋值给image属性来显示图像。可以通过变通的方法来实现，流行的做法是新建一个页面专门用来显示图像，这里代码直接用孟子E章前辈的（作了小修改，主要是剔除78个byte字节流来正常显示northwind数据库的图片）：

ReadImage.aspx.cs

复制代码 代码如下:

using System;

using System.Collections;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

using System.Data.SqlClient;

namespace WebApplication2

{

public partial class ReadImage : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

string strImageID = Request.QueryString["id"];

SqlConnection myConnection = new SqlConnection("Data Source=.;Initial Catalog=northwind;User Id=sa;Password=123456;");

SqlCommand myCommand = new SqlCommand("Select Picture from Categories Where CategoryID="

+ strImageID, myConnection);

try

{

myConnection.Open();

SqlDataReader myDataReader;

myDataReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection);

if (myDataReader.Read())

{

Response.Clear();

Response.ContentType = "image/jpeg";

byte[] b = (byte[])myDataReader["Picture"];

//下面的方法就是用来让图片可以正常显示

byte[] temp=new byte [b.Length -78];

Array.Copy(b, 78, temp, 0, b.Length - 78);

Response.BinaryWrite(temp);

}

myConnection.Close();

}

catch (SqlException SQLexc)

{

Response.Write(SQLexc.ToString ());

}

Response.End();

}

}

}

在源页面如Default.aspx.cs可以通过下面方法调用

复制代码 代码如下:

protected void Page_Load(object sender, EventArgs e)

{

if(!IsPostBack )

Image1.ImageUrl = FormatURL("1");

}

protected string FormatURL(string strArgument)

{

return "ReadImage.aspx?id=" + strArgument;

}

如果不想新建一个页面来承载图像，也可以使用下面的方法：（注意：下面的类是自定义的，大家看得懂这个方法就可以了）

复制代码 代码如下:

using System;

using System.Collections;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

using System.Data.SqlClient;

namespace WebApplication2

{

public partial class ReadImage : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

string strImageID = Request.QueryString["id"];

SqlConnection myConnection = new SqlConnection("Data Source=.;Initial Catalog=northwind;User Id=sa;Password=123456;");

SqlCommand myCommand = new SqlCommand("Select Picture from Categories Where CategoryID="

+ strImageID, myConnection);

try

{

myConnection.Open();

SqlDataReader myDataReader;

myDataReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection);

if (myDataReader.Read())

{

Response.Clear();

Response.ContentType = "image/jpeg";

byte[] b = (byte[])myDataReader["Picture"];

byte[] temp=new byte [b.Length -78];

Array.Copy(b, 78, temp, 0, b.Length - 78);

Response.BinaryWrite(temp);

}

myConnection.Close();

}

catch (SqlException SQLexc)

{

Response.Write(SQLexc.ToString ());

}

Response.End();

}

}

}