when get dynamic compiled assemblies unloaded?

Springy

Hello,

since all (temporary) compiled assemblies produced and attached by report.Prepare() are loaded into the default AppDomain they never will be unloaded -- when will the process be out of handles?

AlexTZ

Hello,

Dynamic assemblies are never unloaded. If you prepare thousands of reports, you will run out of memory (each report assembly is about 50kb).

The solution is to create new AppDomain and execute the report in it. When you no longer need the report, unload the domain. Creating/unloading domains is rather slow (10x slower than just creating a new instance of report), that's why we didn't implement that method in FastReport. But, at the application level, you may optimize this process. You may create a domain and use it, say, 1000 times, then unload it. In this case the performance hit will not so big.

    AppDomain appDomain = null;
    // domain time-to-live
    int domainTTL = 0;


...
        if (appDomain == null)
        {
            AppDomainSetup appDomainSetup = new AppDomainSetup();
            appDomainSetup.ShadowCopyFiles = "false";
            appDomainSetup.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory;
            appDomain = AppDomain.CreateDomain("new domain", AppDomain.CurrentDomain.Evidence, appDomainSetup);
        }

        Worker worker = appDomain.CreateInstanceAndUnwrap(
            this.GetType().Assembly.FullName, typeof(Worker).FullName) as Worker;

        worker.Print();

        // unload the domain after 1000times of use
        domainTTL++;
        if (domainTTL > 1000)
        {
            AppDomain.Unload(appDomain);
            appDomain = null;
            domainTTL = 0;
        }
...

// this class is doing actual printing
public class Worker : MarshalByRefObject
{
    public void Print()
    {
        using (Report report = new Report())
        {
            report.Load("file.frx");
            report.RegisterData(ds, "Data");

            Config.ReportSettings.ShowProgress = false;
            report.Prepare();
        }
    }
}