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I am getting an error same error when loading "dplyr" library.

engine.Evaluate("library(dplyr)");

Above code me same error

"An unhandled exception of type 'System.StackOverflowException' occurred in RDotNet.dll".

Can someone please help me? Thanks in advance...

The screenshot of the error

Ranjeet Singh
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    Can you also provide detailed stack trace? Including stack trace often identifies your problem easier, also add related example codes if necessary (not just the line throwing exception). – Tetsuya Yamamoto Apr 03 '18 at 07:08
  • Hi Tetsuya, i have attached the screenshot. Please look into this. The exception does not contain any stack trace, the exception is only one liner that i described in the question. Please refer the screenshot – Ranjeet Singh Apr 03 '18 at 08:58

2 Answers2

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I had a similar issue with loading dplyr and other R libraries. Turns out of the issue is with IIS and IIS Express having stack size of 256K on 32-bit and 512 K on 64-bit OS as mentioned here. You can get around this by either:

1) Creating a thread with a larger stack size and executing the R.NET commands inside of it. For example: 

Thread t = new Thread(MyMethodToDoRWork, 2500000 /*thread stack size of 2.5MB*/);

2) Change the default stack size of the IIS or IIS Express process via the EditBin tool (comes with Visual Studio). See the example here. I don't recommend this however as you will be modifying the actual IIS/IIS Express binary file.

FastNeutron
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I solved the crash issue by adding all R code to the new thread. It runs perfectly. In debug mode I can even see that the R code is evaluated correctly! Code below (it is in VB but easy to covert to C#). Plus I included some more context that may help.

The catch is, now that we are in another thread, I cannot access the UI thread. Seems there's a great way to accomplish this in Win Forms using a UI's Invoke method but webcontrols don't seem to have this method. Hope this helps some.

Public Class SPF_R
Inherits System.Web.UI.Page

Dim t As System.Threading.Thread

...

Private Sub RunRStuff()

    Dim RCode As String = ""
    Dim engine As REngine = REngine.GetInstance(Nothing, True, Nothing)
    Dim myPath As String = ViewState("Folder") & ViewState("File")
    engine.Initialize()

    engine.Evaluate("library(MASS)") : RCode &= "library(MASS)" & vbCrLf
    engine.Evaluate("library(ggplot2)") : RCode &= "library(ggplot)" & vbCrLf
    engine.Evaluate("library(broom)") : RCode &= "library(broom)" & vbCrLf
   
    ...
   
End Sub

Private Function DevelopSPF() As Boolean

    cmdSPF.Enabled = False

    t = New System.Threading.Thread(AddressOf RunRStuff, 2500000)
    t.Start()

    cmdSPF.Enabled = True
    Return True

End Function

...
irkgreen
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