如何使用asp.net获取使用ajaxfileupload上传的图像宽度和高度

Question

I think ajaxcontroltoolkit:ajaxfileupload has too many bugs and wane. since I'm using this component frequently in my projects, I overcome to many serious disturbing bugs and functionality of this control. Now, I seriously need to get uploaded image width and height using ajaxfileupload before I save it to check either width or height are correct and based on retrieved information, informing users in case of image width and height are not compatible and then prevent the process to go further and save the picture. Any Ideas please?!

HTML Side:

<asp:AjaxFileUpload ID="AjaxFileUpload1" runat="server"
        onuploadcomplete="AjaxFileUpload1_UploadComplete" ThrobberID="myThrobber" MaximumNumberOfFiles="1" AllowedFileTypes="jpg,jpeg"/>

Behind Code:

protected void AjaxFileUpload1_UploadComplete(object sender, AjaxControlToolkit.AjaxFileUploadEventArgs e)
{
    string filePath = "~/upload/" + e.FileName;
    AjaxFileUpload1.SaveAs(filePath);

}

Answer 1

AjaxFileUpload just handles the upload but doesn't give you any information about the file itself. You need to use something like

System.Drawing.Image objImage = System.Drawing.Image.FromFile(Server.MapPath(filePath));
width = objImage.Width;
height = objImage.Height; 

If you do not want to load the file into memory, you can check How do I reliably get an image dimensions in .NET without loading the image? or Getting image dimensions without reading the entire file .

An alternative would be to check image width and height on client side, using a tool like Plupload or a similar one.