Image.FromStream(PostedFile.InputStream) Fails. (Parameter is not valid.) (AsyncFileUpload))
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问题 I'm using an AsyncFileUpload (AJAX Toolkit) to upload images. I have a Button which handle the image resizing. This have worked fine for some time, but not anymore... protected void BtnUploadImage_Click(object sender, EventArgs e) { var imageFileNameRegEx = new Regex(@"(.*?)\.(jpg|jpeg|png|gif)$", RegexOptions.IgnoreCase); if (!AsyncFileUpload1.HasFile || !imageFileNameRegEx.IsMatch(AsyncFileUpload1.FileName)) { AsyncFileUpload1.FailedValidation = true; ErrorLabel.Visible = true; return; }