在按钮单击时获取asyncfileupload控制文件名

时间:2013-09-11 13:51:05

标签: asp.net ajax ajaxcontroltoolkit

我在asp.net页面上使用ajaxfileupload控件。上传图像后,我调用uploadcomplete方法将图像保存在磁盘上并使用以下javascript在图像控件中显示:

  string fileName = Guid.NewGuid() + Path.GetExtension(PhotoAFU.FileName.Trim()); // encrypt filename 

                    string filePath = Path.Combine(storagePath, fileName);
                    string fileVirtPath = GetImageUrl(fileName); 

       int rnd = new Random((int)DateTime.Now.Ticks).Next(1, 1000);
                    ScriptManager.RegisterClientScriptBlock(PhotoAFU, PhotoAFU.GetType(), "img",
                        String.Format(
                            @"top.document.getElementById('{0}').src='{1}?x={2}';
                            top.document.getElementById('{3}').value = '{4}'",
                            EditPhotoImage.ClientID,
                            fileVirtPath,
                            rnd,
                            UploadedImageFileNameHF.ClientID,
                            fileName),
                        true
                );

现在我点击一个保存按钮,尝试使用以下代码获取图像:

Path.GetFileName(EditPhotoImage.ImageUrl) // shows old image


or


Path.GetFileName(PhotoAFU.FileName) // it shows actual image name not encrypted one

但它们都显示旧图像而不是当前图像或实际图像名称未加密名称。如何在此方法中从上面的方法获取文件名?我尝试使用viewstate,但它无法正常工作。

1 个答案:

答案 0 :(得分:2)

您可以在PostedUrl事件处理程序中的AjaxFileUploadEventArgs参数的UploadComplete属性中将数据从服务器传递到客户端作为JSON obeject,并在客户端的OnClientUploadComplete处理程序中获取此数据:

protected void AjaxFileUpload1_OnUploadComplete(object sender, AjaxFileUploadEventArgs e)
{
    string fileName = Guid.NewGuid().ToString();
    string fileVirtPath = "foobar";

    e.PostedUrl = string.Format("{{ fileName: '{0}', imageSrc: '{1}?x={2}' }}", 
        fileName, fileVirtPath, new Random((int)DateTime.Now.Ticks).Next(1, 1000));
}

 function AjaxFileUpload1_OnClientUploadComplete(sender, args) {
      var fileInfo = Sys.Serialization.JavaScriptSerializer.deserialize(args.get_postedUrl());
      $get("<%= EditPhotoImage.ClientID %>").src = fileInfo.imageSrc;
      $get("<%= UploadedImageFileNameHF.ClientID %>").value = fileInfo.fileName;
 }