Creating reports and dashboards | Stimulsoft community forum

Posted: **Mon Aug 05, 2013 3:07 pm**

I've a question about using the report component correclty.

Let's assume I've 20 different MRT files with totally different reports and layouts.
Is it possible to create a single StiReport object and load the MRT files dynamically?

What I want to achive is, load the reports dynamically so they can be disposed from memory.

My latest approach takes a lot of memory as I use a new StiReport object for every report.
Then I merge let's say about 100 reports (each with it's own object) into one single
report. The problem is, that the 100 reports cannot be totally disposed from memory as
each report object was compiled and I learned from another post that it is not possible
to unload them from memory from the same app domain.

Currently I use VB.NET + Stimulsoft.NET report latest version.

I search for a way to use different reports with less as possible memory.

Thank you in advance.

Best Regards,
Thomas

Posted: **Wed Aug 07, 2013 7:25 am**

You can solve this problems. I need describe some principles of the functioning the StimulReport.Net.

1. Source code of the report is formed. Forming based on the grounds of meta description of the report
2. This source code is compiled in to assembly
3. Assembly is loaded in to memory
4. Create object of the report from loaded assemblies
5. Report is rendered
6. Report is showed

The loaded assembly occupies place in memories. If ten once produce compiling the report,
that will be ten are once created assembly of the report and loaded in memory. How to correct?
Regrettably .Net Framework does not give the possibility to unload the assembly from memory
(only together with application domain, but this method has much restrictions).

1. Save the report as class and add it to project. In this case compiling occurs
together with project.
2. Save the report as assembly. Before building of the report its necessary to load
from assembly with method StiReport.GetReportFromAssembly.

Method has two variants of the work:

1.

Code: Select all

StiReport report = StiReport.GetReportFromAssembly("myreport.dll");

Report will is loaded in memory exactly so much once how much will is caused this method,
but at file of the assembly of the report will not be locked.

2.

Code: Select all

StiReport report = StiReport.GetReportFromAssembly("myreport.dll", true);

Report will is loaded in memory only once even though cause the method over and over again.
At file of the assembly will be locked before closing of application (blocking leaves only after
closing of application). Use of this method does not cause the memory leaks since assembly
of the report is loaded in memory only once.

Loading the reports from assemblies has one unpleasant minus - it is necessary beforehand to
prepare the assemblies of the reports. But minus possible easy avoid. Idea is concluded in that
to produce compiling the report under the first start the report on building:

1. Check, there is file of the compiled report on disk?
2. If file there is, that loads report from assembly and start on execution
3. File does not exist, then compile the report in to file (compiling will is made in any cases)
and start the report on execution.

Under following start the report on execution he will is loaded from file. Example of the code:

Code: Select all

StiReport report = null;
					
string compiledReportFile = "report.dll";

if (File.Exists(compiledReportFile))
{
report = StiReport.GetReportFromAssembly(compiledReportFile, true);
	report.RegData(“MyData”, dataSet);
	report.Render();
}
else
{
	report = new StiReport();
	report.Load(file);
		
	report.RegData(“MyData”, dataSet);
										
        report.Compile(compiledReportFile);						
			
	report.Render();
}

Note: If report is loaded from assembly, that speed of the building of the reports
much above since compiling is not required.

About data. If object of the report iexist in memory long time, that necessary to clean
the references to data after building of the report is finished:

Code: Select all

Report.Dictionary.DataStore.Clear();

If report was compiled, that in addition:

Code: Select all

Report.CompiledReport.DataStore.Clear();

Thanks.

Creating reports and dashboards | Stimulsoft community forum

Use a single StiReport object to save memory?

Use a single StiReport object to save memory?

Re: Use a single StiReport object to save memory?