求一段上传图片的代码

Question

如题，请问如何上传图片，最好能有一段简单详细的代码，在线等，谢谢

Answer 1

<table> 
            <tr> 
                <td colspan="2" style="height: 21px" > 
                    使用标准HTML来进行图片上传</td> 
            </tr> 
            <tr> 
                <td style="width: 400px"> 
                    <input id="InputFile" style="width: 399px" type="file" runat="server" /></td> 
                <td style="width: 80px"> 
                    <asp:Button ID="UploadButton" runat="server" Text="上传图片" OnClick="UploadButton_Click" /></td> 
            </tr> 
            <tr> 
                <td colspan="2" > 
                    <asp:Label ID="Lb_Info" runat="server" ForeColor="Red"></asp:Label></td>                 
            </tr> 
        </table>    
string uploadName = InputFile.Value;//获取待上传图片的完整路径，包括文件名 
        //string uploadName = InputFile.PostedFile.FileName; 
        string pictureName = "";//上传后的图片名，以当前时间为文件名，确保文件名没有重复 
        if (InputFile.Value != "") 
        { 
            int idx = uploadName.LastIndexOf("."); 
            string suffix = uploadName.Substring(idx);//获得上传的图片的后缀名 
            pictureName = DateTime.Now.Ticks.ToString() + suffix; 
        } 
        try 
        { 
            if (uploadName != "") 
            { 
                string path = Server.MapPath("~/images/"); 
                InputFile.PostedFile.SaveAs(path + pictureName); 
            } 
        } 
        catch (Exception ex) 
        { 
            Response.Write(ex); 
        } http://www.cnblogs.com/qiantuwuliang/archive/2009/08/21/1551200.html

Answer 2

this.File1.PostedFile.SaveAs(Server.MapPath(目录)+文件名）;

Answer 3

  <div id="myimg">
                <%-- <asp:Image ID="newPreview" runat="server"  />--%>
                <img id="newPreview" alt="我的头像" src="" runat="server" />
            </div>
           <div id="MyFileUpload1"> <asp:FileUpload ID="FileUpload1" Width="250px" runat="server" onchange="showprepic(this.value)"
                Height="22px" /></div>新建立一个JS文件 放进去的代码 这个是让图片及时预览的JS
 //上传图片时预览
   function PreviewImg(FileUpload1){
//显示图片
var newPreview = document.getElementById("newPreview");
            newPreview.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = FileUpload1.value;
            newPreview.style.display = "block";
}
  function showprepic(file){      var newPreview = document.getElementById("newPreview");
            newPreview.src = "";
            newPreview.src = "file://" + file;
            newPreview.style.display = "block";
      }
      
         var flag=false;
        function DrawImage(ImgD){
           var image=new Image();
           image.src=ImgD.src;
           if(image.width>0 && image.height>0){
            flag=true;
            if(image.width/image.height>= 120/80){
             if(image.width>120){  
             ImgD.width=120;
             ImgD.height=(image.height*320)/image.width;
             }else{
             ImgD.width=image.width;  
             ImgD.height=image.height;
             }
             ImgD.alt=image.width+"×"+image.height;
             }
            else{
             if(image.height>80){  
             ImgD.height=80;
             ImgD.width=(image.width*80)/image.height;     
             }else{
             ImgD.width=image.width;  
             ImgD.height=image.height;
             }
             ImgD.alt=image.width+"×"+image.height;
             }
            }
           /**//**//**//*else{
            ImgD.src="";
            ImgD.alt=""
            }*/
           } 
后台 代码 
  #region 上传图片    public string ShowPotole()
    {
        try
        {
            string fileName = "";
            if (this.FileUpload1.HasFile)//检查是否有文件
            {
                string fullFileName = this.FileUpload1.PostedFile.FileName;//文件路径名
                fileName = fullFileName.Substring(fullFileName.LastIndexOf("\\") + 1);   //图片名称
                string type = fullFileName.Substring(fullFileName.LastIndexOf(".") + 1);        //图片格式                if (type == "jpg" || type == "JPG" || type == "gif" || type == "GIF" || type == "BMP" || type == "bmp") //判断是否为图片类型
                {
                    if (this.FileUpload1.PostedFile.ContentLength > 200 * 1024)
                    {
                        Response.Write("<script>alert('上传图片必须小于50k！');</script>");
                        return "";
                    }
                    else
                    {
                        string path = HttpContext.Current.Request.MapPath("~/img/");//获取上传文件的网站目录路径                        if (File.Exists(Server.MapPath("~/img/" + fileName)))//(这个地方做判断是不是 有这 张图片如果已经有图片 则不能上传 )
                        {
                            
                            return "";
                        }
                        else
                        {
                            this.FileUpload1.SaveAs(path + fileName);//存储文件到磁盘
                            // this.newPreview.InnerText. = "~/admin/img/" + fileName;//显示图片
                            // this.newPreview.InnerHtml = "~/admin/img/" + fileName;//显示图片
                        }
                    }
                }
                else
                {
                    Response.Write("<script>alert('非图片类型，不允许上传！');</script>");
                    return "";
                }
            }
            else
            {
                if (HiddenField1.Value != null && HiddenField1.Value != "")
                {
                    fileName = ArticleManager.Instance.GetArticleByArticleid(int.Parse(HiddenField1.Value)).Giftimg;
                }
                else
                    Response.Write("<script>alert('文件未指定，你确定要添加！');</script>");
            }
            return fileName;
        }
        catch (Exception)
        {            throw;
        }
    }
    #endregion

Answer 4

谢谢，请问 //上传图片时预览
   function PreviewImg(FileUpload1)如何触发

Answer 5

http://www.cnblogs.com/cloudgamer/archive/2009/12/22/ImagePreview.html