1.FileUpload控件和上传的button控件
<asp:FileUpload ID="fuPhoto" runat="server" Style="width: 150px;" />
<asp:Button ID="btnSaveImage" runat="server" Text="上传" OnClick="btnSaveImage_Click" Style="width: 50px;" ValidationGroup="QUXIAO" />
2.button的点击事件
protected void btnSaveImage_Click(object sender, EventArgs e)
{
HttpPostedFile UpFile = fuPhoto.PostedFile;
try
{
if (UpFile.ContentLength == 0)
{ //文件长度为零时
Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('请选择要上传的图片')</script>");
//Page.RegisterStartupScript("err", "<script language=javascript>alert('请你选择你要上传的文件');</script>");
}
else
{
FileByteArray = new Byte[UpFile.ContentLength]; //图象文件临时储存Byte数组
Stream StreamObject = UpFile.InputStream; //建立数据流对像
//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
StreamObject.Read(FileByteArray, 0, UpFile.ContentLength);
Session["photo"] = FileByteArray;
this.Image1.ImageUrl = "ImageView.aspx?random=" + new Random().Next().ToString();
}
}
catch (Exception err)
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('上传文件失败')</script>");
//Page.RegisterStartupScript("err", "<script language=javascript>alert('上传文件失败," + err.Message + "');</script>");
}
}
3.建一个新页面（ImageView.aspx.）
此页面前台不放任何控件，后台代码：
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (Session["photo"] != null)
{
Byte[] FileByteArray = (Byte[])Session["photo"];
Response.BinaryWrite(FileByteArray);
Response.End();
}
else
{
string name = HttpContext.Current.Server.MapPath("~/images/nothing.jpg");
FileStream fs = File.OpenRead(name);
byte[] content = new byte[fs.Length];
fs.Read(content, 0, content.Length);
Response.BinaryWrite(content);
Response.End();
}
}
}
4.在上传页面的pageload写上如代码.
if (!IsPostBack)
{
Image1.ImageUrl = "ImageView.aspx?random=" + new Random().Next().ToString();
}
5.将上传的图片以二进制的形式存到数据库中
pageload中 FileByteArray = null;Session["photo"] = null;
保存方法中 patInfo.Photo = (Byte[])Session["photo"];
6.将二进制的图片从数据库中读出来
公共方法中
public string saveFilePath
{
get { return ViewState["saveFilePath"].ToString(); }
set { ViewState["saveFilePath"] = value; }
}
public Byte[] FileByteArray
{
get
{
return ViewState["FileByteArray"] as Byte[];
}
set { ViewState["FileByteArray"] = value; }
}
显示图片
FileByteArray = (Byte[])patInfo.Photo;
Session["photo"] = (Byte[])patInfo.Photo;