EPPlus 2.9.0.1 throws System.IO.IsolatedStorage.IsolatedStorageException when trying to save a file larger than ~ 1.5 MiB from the SSIS package

Question

Problem

When I try to save the file over ~ 1.5 MiB with EPPlus ExcelPackage.Save() , throws a System.IO.IsolatedStorage.IsolatedStorageException .

Explanation

I am creating an SSIS package with Visual Studio 2008 9.0.30729.4462 QFE and the .NET Framework 3.5 SP1 to export the contents of a SQL Server 2008 SP2 10.0.4311.0 64 bit EPPlus 2.9.0.1 through EPPlus 2.9.0.1 .

The SSIS package is very simple: Execute SQL Task , which reads the contents of a table and puts it in a variable, and then a Script task , which reads a record set variable and saves the contents to disk through EPPlus.

Script Code Task:

 namespace ST_00a0b40814db4c7290b71f20a45b62c6.csproj { using System; using System.AddIn; using System.Data; using System.Data.OleDb; using System.IO; using Microsoft.SqlServer.Dts.Runtime; using Microsoft.SqlServer.Dts.Tasks.ScriptTask; using OfficeOpenXml; [AddIn("ScriptMain", Version = "1.0", Publisher = "", Description = "")] public partial class ScriptMain : VSTARTScriptObjectModelBase { public void Main() { DataTable documentList = new DataTable(); using (OleDbDataAdapter adapter = new OleDbDataAdapter()) { adapter.Fill(documentList, this.Dts.Variables["DocumentList"].Value); } if (documentList.Rows.Count > 0) { FileInfo fileInfo = new FileInfo(@"C:\Temp\Test.xlsx"); if (fileInfo.Exists) { fileInfo.Delete(); } using (ExcelPackage package = new ExcelPackage(fileInfo)) { ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("Documents"); for (Int32 i = 0; i < documentList.Rows.Count; i++) { for (Int32 j = 0; j < documentList.Columns.Count; j++) { worksheet.Cells[i + 1, j + 1].Value = documentList.Rows[i][j]; } } package.Save(); } } Dts.TaskResult = Convert.ToInt32(DTSExecResult.Success); } } } 

When I load the Script Task with only a couple of records, the package works fine, but when I run it in the whole table, package.Save(); will explode with the exception of System.IO.IsolatedStorage.IsolatedStorageException: Unable to determine the identity of domain .

Here you can see the full stack trace:

 Error: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidOperationException: Error saving file C:\Temp\Test.xls ---> System.IO.IsolatedStorage.IsolatedStorageException: Unable to determine the identity of domain. at System.IO.IsolatedStorage.IsolatedStorage._GetAccountingInfo(Evidence evidence, Type evidenceType, IsolatedStorageScope fAssmDomApp, Object& oNormalized) at System.IO.IsolatedStorage.IsolatedStorage.GetAccountingInfo(Evidence evidence, Type evidenceType, IsolatedStorageScope fAssmDomApp, String& typeName, String& instanceName) at System.IO.IsolatedStorage.IsolatedStorage._InitStore(IsolatedStorageScope scope, Evidence domainEv, Type domainEvidenceType, Evidence assemEv, Type assemblyEvidenceType, Evidence appEv, Type appEvidenceType) at System.IO.IsolatedStorage.IsolatedStorage.InitStore(IsolatedStorageScope scope, Type domainEvidenceType, Type assemblyEvidenceType) at System.IO.IsolatedStorage.IsolatedStorageFile.GetStore(IsolatedStorageScope scope, Type domainEvidenceType, Type assemblyEvidenceType) at System.IO.IsolatedStorage.IsolatedStorageFile.GetUserStoreForDomain() at MS.Internal.IO.Packaging.PackagingUtilities.ReliableIsolatedStorageFileFolder.GetCurrentStore() at MS.Internal.IO.Packaging.PackagingUtilities.ReliableIsolatedStorageFileFolder..ctor() at MS.Internal.IO.Packaging.PackagingUtilities.GetDefaultIsolatedStorageFile() at MS.Internal.IO.Packaging.PackagingUtilities.CreateUserScopedIsolatedStorageFileStreamWithRandomName(Int32 retryCount, String& fileName) at MS.Internal.IO.Packaging.SparseMemoryStream.EnsureIsolatedStoreStream() at MS.Internal.IO.Packaging.SparseMemoryStream.SwitchModeIfNecessary() at MS.Internal.IO.Packaging.SparseMemoryStream.Write(Byte[] buffer, Int32 offset, Int32 count) at MS.Internal.IO.Packaging.CompressEmulationStream.Write(Byte[] buffer, Int32 offset, Int32 count) at MS.Internal.IO.Packaging.CompressStream.Write(Byte[] buffer, Int32 offset, Int32 count) at MS.Internal.IO.Zip.ProgressiveCrcCalculatingStream.Write(Byte[] buffer, Int32 offset, Int32 count) at MS.Internal.IO.Zip.ZipIOModeEnforcingStream.Write(Byte[] buffer, Int32 offset, Int32 count) at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder) at System.IO.StreamWriter.Write(String value) at System.IO.TextWriter.Write(String format, Object arg0, Object arg1) at OfficeOpenXml.ExcelWorksheet.UpdateRowCellData(StreamWriter sw) at OfficeOpenXml.ExcelWorksheet.SaveXml() at OfficeOpenXml.ExcelWorksheet.Save() at OfficeOpenXml.ExcelWorkbook.Save() at OfficeOpenXml.ExcelPackage.Save() --- End of inner exception stack trace --- at OfficeOpenXml.ExcelPackage.Save() at ST_00a0b40814db4c7290b71f20a45b62c6.csproj.ScriptMain.Main() in C:\Temp\ScriptMain.cs:line 39 --- End of inner exception stack trace --- at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) at System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams) at System.Type.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args, CultureInfo culture) at Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTATaskScriptingEngine.ExecuteScript() 

I was able to identify a problem with the size of the created file: when the size of the Excel file grows by about 1.5 million (this is more or less significant, I could not find the exact size), an error appears.

The only information I could find on the net was a blog post , where the blogger offers a solution in which he “outsource” the code to a DLL and uploads it to the GAC server, and then runs the following code:

 AppDomainSetup setup = new AppDomainSetup(); setup.ApplicationBase = rootPath; setup.DisallowBindingRedirects = false; setup.DisallowCodeDownload = true; setup.ConfigurationFile = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile; Evidence evidence = new Evidence(); evidence.AddHost(new Zone(SecurityZone.MyComputer)); AppDomain ad = AppDomain.CreateDomain("NewAppDomain", evidence, setup); YourClass yourClass = (YourClass)ad.CreateInstanceAndUnwrap(typeof(YourClass).Assembly.FullName, typeof(YourClass).FullName); yourClass.aMethod(); AppDomain.Unload(ad); 

However, I cannot try this solution because I do not have access to the GAC server and I cannot load the DLL.

Is there any other way around this problem?

I also opened an error report in the EPPlus answer question on this.

Summary

• SSIS package
• Visual Studio 2008 9.0.30729.4462 QFE
• .NET Framework 3.5 SP
• SQL Server 2008 SP2 10.0.4311.0 64 bit
• EPPlus 2.9.0.1
• Large output file
• System.IO.IsolatedStorage.IsolatedStorageException: Unable to determine the domain identifier

Answer 1

Turns out you don’t have to create a whole new DLL and load it into the GAC to make this work. You can simply create a new instance of your source class (or a new class using the methods you need to call) in another AppDomain.

1) Take the code that throws the exception and put it in a separate method. Ensure that all objects to be transferred or displayed are Serializable or extend MarshalByRefObject. In your case:

 public void SavePackage(FileInfo fileInfo, DataTable documentList) { using (ExcelPackage package = new ExcelPackage(fileInfo)) { ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("Documents"); for (Int32 i = 0; i < documentList.Rows.Count; i++) { for (Int32 j = 0; j < documentList.Columns.Count; j++) { worksheet.Cells[i + 1, j + 1].Value = documentList.Rows[i][j]; } } package.Save(); } } 

2) Create a new instance of your class using the code above.

 AppDomainSetup setup = new AppDomainSetup(); setup.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory; Evidence evidence = new Evidence(AppDomain.CurrentDomain.Evidence); evidence.AddAssembly(Assembly.GetExecutingAssembly().FullName); evidence.AddHost(new Zone(SecurityZone.MyComputer)); AppDomain ad = AppDomain.CreateDomain(DomainName, evidence, setup); ScriptMain mainClass = (ScriptMain)ad.CreateInstanceAndUnwrap(typeof(ScriptMain).Assembly.FullName, typeof(ScriptMain).FullName); 

3) Call the method and then unload the AppDomain.

 try { mainClass.SavePackage(fileInfo, documentList); } finally { AppDomain.Unload(ad); }