Solved

Crystal Reports Viewer Slow on First Load but Fast After

Posted on 2009-07-05
4
4,036 Views
Last Modified: 2012-05-07
I find the Crystal Reports Viewer (winforms) very slow to load the first time it is called. After that it is much faster.

I have tried to open a form with the viewer invisibly, but can't get this to work in CSHARP.  If I do this visibly when then Main Menu loads, it solves the problem, i.e., the "first" time a report is run the viewer comes up instantly.

Have also tried creating an instance of a form with a viewer, NOT showing the form, but only calling a refresh on the viewer.  I don't see much timing difference with this approach.

I noticed another posting on this topic that suggests opening a Crystal report in another thread, but I could not get this code to work in CSHARP.
0
Comment
Question by:hertzgordman
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 

Author Comment

by:hertzgordman
ID: 24780193
Here is my code for just creating an instance of the form and refreshing the viewer:

private void OpenReportViewerInvisible()
        {


            // Open Report for USER
            MonthReport1Form MyForm = new MonthReport1Form();

            {
                try
                {

                    // UserName
                    MyReports MyReportsClass = new MyReports();
                    string UserName = MyReportsClass.GetWindowsUser();

                    MyForm.FormParam_UserName = UserName;
                    MyForm.FormParam_ReportFileName = @"C:\Database\LoanTrack\LoanWithDeferredInterest.rpt";

                    this.Cursor = Cursors.WaitCursor;

                    // Refresh the viewer
                    MyForm.MonthReport1FormViewerRefesh();

                    // Cursor off
                    this.Cursor = Cursors.Default;

                    // Close the form
                    MyForm.Close();


                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }

        }
0
 
LVL 70

Accepted Solution

by:
Éric Moreau earned 500 total points
ID: 24781186
I have this code that I never tried to preload CR assemblies:

> > Is it possible to preload assemblies before they are called?  Each
> > time the first report in my app runs, it takes 10-15 secs while it
> > loads the appropriate assemblies, after that any report that is run
> > appears immediatly.

> Here you go...

> ' load up crystal when the app starts up.
> ' use a separate thread since its such a pig.
>             TraceWriteLine("starting Crystal Reports Thread")
>             myTimer = New FunctionTimer("load crystal")
>             Dim t As New Thread(AddressOf LoadCrystal)
>             t.Priority = ThreadPriority.BelowNormal
>             t.Start()
>             myTimer.EndTimer()
>             TraceWriteLine("...thread started")


> ' here's the code to load up a dummy report.
> ' this seems to load up and keep everything in memory throughout the
> life of the app.

>     Public Sub LoadCrystal()
>         crReport = New ReportDocument

>         Try
>             ' Need to preload crystal engine so the reports will print
> quickly throughout the rest of the application.
>             ' This report is not used, it is just loaded.  Testing so
> far 12/23/04 has not shown any
>             ' problems such as memory or print errors.
>             crReport.Load(CrystalReportFolder & "rptBlank.rpt")

>         Catch ex As Exception
>             DisplayException(ex, "Error: Could find the startup
> Crystal Report named 'rptBlank.rpt'." & _
>                vbCrLf & "If you are a new user, you may lack Server
> permissions to read this directory and file: " & CrystalReportFolder & 
> "rptBlank.rpt" & _
>                vbCrLf & "Or the report may have been deleted or
> corrupted.  Please Call IT.  [EJS0412311300]")
>         End Try
>     End Sub

0
 

Author Comment

by:hertzgordman
ID: 24781494
I did try the code and I am not sure if it speeding things up or not.

Also found a way to load the viewer on a "hidden" form by setting the forms opacity to 0%:

private void OpenReportViewerInvisible()
        {


            // Open Report for USER
            MonthReport1Form MyForm = new MonthReport1Form();

            {
                try
                {

                    // UserName
                    KingSettReports MyReportsClass = new KingSettReports();
                    string UserName = MyReportsClass.GetWindowsUser();

                    MyForm.FormParam_UserName = UserName;
                    MyForm.FormParam_ReportFileName = @"C:\Database\LoanWithDeferredInterest.rpt";

                    this.Cursor = Cursors.WaitCursor;

                    // Show the form with no opacity
                    MyForm.Opacity = 0;
                    MyForm.Show();

                    // Refresh the viewer
                    MyForm.MonthReport1FormViewerRefesh();

                    // Cursor off
                    this.Cursor = Cursors.Default;

                    // Close the form
                    MyForm.Close();

                    // MessageBox.Show("Form loaded");



                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }

        }
0
 
LVL 70

Assisted Solution

by:Éric Moreau
Éric Moreau earned 500 total points
ID: 24781761
the trick is to load a small dummy report when the application starts to load CR assemblies in memory.
0

Featured Post

MS Dynamics Made Instantly Simpler

Make Your Microsoft Dynamics Investment Count  & Drastically Decrease Training Time by Providing Intuitive Step-By-Step WalkThru Tutorials.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Additional letters added to Fieldnames - 4 18
Help with a Crystal Formula 6 26
Nested forach loop to linq 3 30
Join Number Parameter with commas 6 14
Hot fix for .Net Crystal Reports 10.2.3600.0 to fix problems with sub reports running on 64 bit operating systems ISSUE: Reports which contain subreports fail with error "Missing Parameter Value" DEPLOYMENT SERVER OS: Windows 2008 with 64 bi…
We all know that functional code is the leg that any good program stands on when it comes right down to it, however, if your program lacks a good user interface your product may not have the appeal needed to keep your customers happy. This issue can…
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …
In an interesting question (https://www.experts-exchange.com/questions/29008360/) here at Experts Exchange, a member asked how to split a single image into multiple images. The primary usage for this is to place many photographs on a flatbed scanner…

697 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question