CODEWITHSUNDEEP
asp.netvb.netformsfile-upload
Christian4423
Christian4423

Reputation: 1796

Testing Maximum File Size

 Protected Sub AddFileButton_Click(ByVal sender As Object, _
      ByVal e As System.EventArgs)

        If FileUploader.HasFile Then

            Dim fileSize = FileUploader.PostedFile.ContentLength

            If fileSize > 1048576 Then
                Info.Text = "This file exceeds the allowed file size (1 MB). Please resize the image or select another file."
                Return

            ElseIf fileSize < 1 Then
                Info.Text = "This file does not have enough content to send. Please choose another file."
                Return

            Try
                Dim extension = System.IO.Path.GetExtension(FileUploader.FileName)
                Dim uniqueFileName = System.Guid.NewGuid.ToString() & extension
                FileUploader.SaveAs("\\filepath\" & FileUploader.FileName)
            Catch ex As Exception
                Info.Text = "ERROR: " & ex.Message.ToString()
            End Try
           End If
        End If
    End Sub

For some reason it is not hitting the If fileSize > 1048576 Then or the Else If fileSize < 1 Then. It is just doing the Try and Catch and displaying an error if it exceeds the 1mb limit I have defined in my web.config.

Is there a syntax or logic error I am not seeing?

Upvotes: 0

Views: 524

Answers (1)

JJS
JJS

Reputation: 6658

Check file size before upload

Client side Upload Canceling

On modern browsers (FF >= 3.6, Chrome >= 19.0, Opera >= 12.0, and buggy on Safari), you can use the HTML5 File API. When the value of a file input changes, this API will allow you to check whether the file size is within your requirements. Of course, this, as well as MAX_FILE_SIZE, can be tampered with so always use server side validation.

document.forms[0].addEventListener('submit', function( evt ) { var file = document.getElementById('file').files[0]; if(file && file.size

Upvotes: 1

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