C# StackOverflowException, Too many Method Calls

Question

I am getting a StackOverflowException during run time, I'm sure that I am calling too many methods, just can't pinpoint where this is happening. When I run the program the Exception occurs when the structurePath variable is declared.

FolderContentManagement.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;

namespace VINA_BATCH.FFManagement
{   
class FolderContentManager : FileContentManager
{
    public int currIndex = 0;

    private VinaProcess.VProcess vproc = new VinaProcess.VProcess();
    private string structurePath = Path.Combine(Directory.GetCurrentDirectory(), "structures");
    private string structureExt = "*.pdbqt";
    private Dictionary<string, string> files = new Dictionary<string, string>();

    public FolderContentManager() { }

    //Returns list of structures
    public string[] GetStructuresPath()
    {
        return Directory.GetFiles(structurePath, structureExt);
    }


    public string[] GetStructureNames()
    {
        string[] structs = Directory.GetFiles(structurePath, structureExt);

        for(int i = 0; i < structs.Length; i++)
        {
            structs[i] = Path.GetFileName(structs[i]);
        }

        return structs;
    }

    public string GetCurrentStructureName()
    {
        string currPath = this.GetCurrentStructurePath();
        return Path.GetFileName(currPath);
    }

    public string GetCurrentStructurePath()
    {
        string currPath = "";
        string[] paths = Directory.GetFiles(structurePath, structureExt);
        for (int i = 0; i < paths.Length; i++)
        {
            if (i == currIndex)
                currPath = paths[i];
        }

        return currPath;
    }

    public string GetNextStructurePath(int index)
    {
        string[] names = GetStructureNames();
        string[] paths = GetStructuresPath();

        string nextPath = "";

        for (int i = 0; i < names.Length; i++)
        {
            if (i == index)
                nextPath = paths[index + 1]; 
        }

        return nextPath;
    }

    /*
    public void CompilePathsFiles()
    {
        string workingPath = GetWorkingPath();
        string[] tempFiles = { GetCurrentStructureName(), findProtein(), "conf.txt", "log.txt" };

        for(int i = 0; i < tempFiles.Length; i++)
        {
            if (i == 0)
                files.Add(structurePath, tempFiles[i]);

            files.Add(workingPath, tempFiles[i]);                
        }

        MessageBox.Show(files.ToString());
    }
    */
    public void Move_RunRoutine()
    {
        /*
            - After conf.txt change copy to vina folder
            - Copy the rest of the working folder file to vina folder
            - Copy the current *.pdbqt file to the vina folder
        */



        string destination = vproc.GetVinaPath();

    }

    public void Move_OutRoutine()

   {
        /*
            - Once an iteration is done move the contents of the vina folder to out folder with the name of the *.pdbqt file 
        */
    }

}
}

GetCurrentStructurePath() is being called from another class like so. This is the only reference to FolderContentManagement that this class has.

contents[1] = String.Format("ligand = {0}", fcm.GetCurrentStructurePath());

Any help would be much appreciated.

I suggest to add a break when you find the file searched in GetCurrentStructurePath — Steve
– Steve, Commented May 13, 2017 at 17:04
To be exact this is the line that is raising the exception private string structurePath = Path.Combine(Directory.GetCurrentDirectory(), "structures"); — Python_Fan1234
– Python_Fan1234, Commented May 13, 2017 at 17:22
Stackoverflows usually occur when you have an infinitely recursive function. — Krythic
– Krythic, Commented May 13, 2017 at 17:39
Please be aware that a StackOverflowException is similar to the proverbial last drop in a glass that make it overflow. It may not be a problem with that drop, it may instead be a problem with whatever filled the glass beforehand. In any case, most likely you have a recursive method somewhere, so go hunt for it. — Lasse V. Karlsen
– Lasse V. Karlsen, Commented May 13, 2017 at 17:42

Community · Accepted Answer · 2017-05-23 12:10:11Z

I'm sure that I am calling too many methods`:

That is not why a StackOverflowException is thrown. There is no limit on how many methods an application can call.

Here is why a StackOverflowException is thrown; quoted from MSDN:

The exception that is thrown when the execution stack overflows because it contains too many nested method calls. StackOverflowException is thrown for execution stack overflow errors, typically in case of a very deep or unbounded recursion.

You say:

When I run the program the Exception occurs when the structurePath variable is declared.

I do not think so. Here is a quick test you can do which proves the issue is elsewhere:

public class Test
{
    public string structurePath = Path.Combine(Directory.GetCurrentDirectory(), "structures");
}

var test = new Test();
var path = test.structurePath;

To Troubleshoot

Start by looking at

any recursive methods you may have and make sure they have a terminating condition

Check your properties and make sure the setter is not calling the getter like this:

private int age;
public int Age
{
    get { return this.age; }
    // This is an easy mistake. It should be this.age (small a)
    set { this.Age = value; } 
}

See this answer for more ideas on troubleshooting.

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