上传图片文件并显示

   &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;         <asp:Label ID="Label9" runat="server" Text="图片："></asp:Label> &nbsp;<br /> &nbsp;&nbsp;      

   <div id="localImag" style="width: 300px; height: 200px; margin-left:250px">     

    <font face="微软雅黑" size="-1">         

    <% LXmallDBDataContext context = new LXmallDBDataContext();          

      string listcode = Request["ids"].ToString();               

string data = context.Goods_Type.Where(p => p.ListCode == listcode).First().Pic;                                               %>             <img id="preview" alt="请先点击选择要上传的图片" src="<%=data %>" style="width:300px; height:200px"  >

</font>         

    <asp:FileUpload ID="PicLoad" style="position:relative; top:-207px; opacity:0; left: -6px; height: 205px; text-align: right; width: 327px;" runat="server" onchange="javascript:setImagePreview(this,localImag,preview);">

</asp:FileUpload>

        </div>           

     <script type="text/javascript">         

    function setImagePreview(docObj, localImagId, imgObjPreview)

{              

   if (docObj.files && docObj.files[0])

{                   

  //火狐下，直接设img属性          

            imgObjPreview.style.display = 'block';         

            imgObjPreview.style.width = '300px';        

             imgObjPreview.style.height = '200px';

                    //火狐7以上版本不能用上面的getAsDataURL()方式获取，需要一下方式         

               imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]);          

       }            

     else {              

       //IE下，使用滤镜          

            docObj.select();               

      var imgSrc = document.selection.createRange().text;

                    //必须设置初始大小         

             localImagId.style.width = "300px";           

          localImagId.style.height = "200px";

                    //图片异常的捕捉，防止用户修改后缀来伪造图片                 

     try {                

         localImagId.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";                 

        localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;              

       }              

       catch (e) {                  

       alert("您上传的图片格式不正确，请重新选择!");       

                  return false;              

       }                  

   imgObjPreview.style.display = 'none';          

           document.selection.empty();        

         }           

      return true;         

    }

</script> 

<br />       

  <br />    

     <br /> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;     

    <asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="确认" /> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;         <br />         <br /> &nbsp;&nbsp;    

    

 

 

 

后台代码：  

 //修改内容
        string listcode = Request["ids"].ToString();
        Goods_Type data = context.Goods_Type.Where(p => p.ListCode == listcode).First();

if (PicLoad.HasFile) //这个空间里面有没有文件      

   {

            string lujing = data.Pic;             //删除图片             File.Delete(Server.MapPath(lujing));

 

            //1.找到要上传的文件名          

   string name = PicLoad.FileName.ToString();

            //2.处理文件名 ,防止上传的文件名被覆盖，       

      string clname = DateTime.Now.ToString("yyyyMMddhhmmssms") + name;

            //3.造一个要保存的路径         

    string path = @"Images\" + clname;

            //处理相对路径为相对路径。是一个映射       

      string jdpath = Server.MapPath(path);

            //5,保存          

   PicLoad.SaveAs(jdpath);           

  data.Pic = "Images/" + clname;        

}