❔ ✅ IndexOutOfRangeException

morry329# · 2023-02-20T16:46:03.693Z

I just tried to code out a simple app that reads a .csv file (as per screenshot) and displays the content in the columns "state" and "city" . My Main points out an IndexOutOfRangeException, so something is out of the range. But I am lost to find it out now. ```static void Main(string[] args) { var codeSearch = new ZIPCodeSearch(); codeSearch.Build(new StreamReader(args[0], Encoding.Default)); //ERROR HERE Console.WriteLine($"Anwendung ZIPCodeSearch"); string value; while ((value = Console.ReadLine()) != "") { var scanned = codeSearch.Classify(value); Console.WriteLine($"Stadt: {codeSearch.Classify(value)} unbekannt"); Console.WriteLine($"Land:{codeSearch.Classify(value)}"); } }``` Could anyone point me in the right direction? My other classes for this project is here - FYI: https://github.com/morry239/HashTableRedBook/blob/master/ZIPCodeSearch/ZIPCodeSearch.cs

T

TheBoxyBear•2/20/23, 4:47 PM

If you don't pass any command line arguments, args will be empty

T

TheBoxyBear•2/20/23, 4:47 PM

You can define arguments when debugging in the project properties

M

morry329#OP•2/21/23, 11:24 AM

A couple of more beginner questions - you mean something like this? https://www.jetbrains.com/help/rider/Unreal_Engine__EzArgs.html#arguments_ezargs

JetBrains Rider Help

Add Program Arguments and Environment Variables | JetBrains Rider

M

morry329#OP•2/21/23, 11:26 AM

If not, shall I enter the valid string into somewhere in the code? The debugging showed that I have some null strings as per screenshot

Bildschirmfoto_2023-02-21_um_12.24.40.png

M

morry329#OP•2/21/23, 11:27 AM

@TheBoxyBear

Mmorry329#A couple of more beginner questions - you mean something like this? https://www....

T

TheBoxyBear•2/21/23, 12:47 PM

This

T

TheBoxyBear•2/21/23, 12:48 PM

Though this only when debugging. Once released, the user still has to provide the arguments to the executable so you still need to check if the array is empty

T

TheBoxyBear•2/21/23, 12:49 PM

The debug option is Rider adding the arguments automatically when running the program.

TTheBoxyBear This

M

morry329#OP•2/21/23, 3:14 PM

Ok I think my problem is now find out what kind of the argument I shall enter into (something along the lines of "if array is null == do this" right?)

M

morry329#OP•2/21/23, 3:16 PM

I have installed the EzArgs plugin mentioned by the JetBrains article and did this:

M

morry329#OP•2/21/23, 3:16 PM

Bildschirmfoto_2023-02-21_um_16.14.49.png

M

morry329#OP•2/21/23, 3:17 PM

It still triggers the Index out of range", so I think my query here is wrong

T

TheBoxyBear•2/21/23, 3:19 PM

The arguments are the values you want in the args array

T

TheBoxyBear•2/21/23, 3:19 PM

The length check needs to be in your code

T

TheBoxyBear•2/21/23, 3:20 PM

Checking the length, not if it's null

M

morry329#OP•2/22/23, 2:02 PM

So this is my progress so far

static void Main(string[] args)
        {

            var codeSearch = new ZIPCodeSearch();
            string filePath = @"/Users/myusername/Desktop/geo-data.csv";
            
            try
            {
                using (StreamReader streamReader = new StreamReader(filePath))
                {
                    while ((filePath = streamReader.ReadLine()) != null)
                    {
                        codeSearch.Build(new StreamReader (new FileStream(filePath, FileMode.Open, FileAccess.Read)));
                        
                    }
                }
            }
            catch(Exception exp)
            {
                Console.WriteLine(exp.Message);
            }
            Console.WriteLine($"ZIPCodeSearch-App");

            string value;
            while ((value = Console.ReadLine()) != "")
            {
                var scanned = codeSearch.Classify(value);
                Console.WriteLine($"Stadt: {codeSearch.Classify(value)} unbekannt");
                Console.WriteLine($"Land:{codeSearch.Classify(value)}");
            }
        }

static void Main(string[] args)
        {

            var codeSearch = new ZIPCodeSearch();
            string filePath = @"/Users/myusername/Desktop/geo-data.csv";
            
            try
            {
                using (StreamReader streamReader = new StreamReader(filePath))
                {
                    while ((filePath = streamReader.ReadLine()) != null)
                    {
                        codeSearch.Build(new StreamReader (new FileStream(filePath, FileMode.Open, FileAccess.Read)));
                        
                    }
                }
            }
            catch(Exception exp)
            {
                Console.WriteLine(exp.Message);
            }
            Console.WriteLine($"ZIPCodeSearch-App");

            string value;
            while ((value = Console.ReadLine()) != "")
            {
                var scanned = codeSearch.Classify(value);
                Console.WriteLine($"Stadt: {codeSearch.Classify(value)} unbekannt");
                Console.WriteLine($"Land:{codeSearch.Classify(value)}");
            }
        }

static void Main(string[] args)
        {

            var codeSearch = new ZIPCodeSearch();
            string filePath = @"/Users/myusername/Desktop/geo-data.csv";
            
            try
            {
                using (StreamReader streamReader = new StreamReader(filePath))
                {
                    while ((filePath = streamReader.ReadLine()) != null)
                    {
                        codeSearch.Build(new StreamReader (new FileStream(filePath, FileMode.Open, FileAccess.Read)));
                        
                    }
                }
            }
            catch(Exception exp)
            {
                Console.WriteLine(exp.Message);
            }
            Console.WriteLine($"ZIPCodeSearch-App");

            string value;
            while ((value = Console.ReadLine()) != "")
            {
                var scanned = codeSearch.Classify(value);
                Console.WriteLine($"Stadt: {codeSearch.Classify(value)} unbekannt");
                Console.WriteLine($"Land:{codeSearch.Classify(value)}");
            }
        }

static void Main(string[] args)
        {

            var codeSearch = new ZIPCodeSearch();
            string filePath = @"/Users/myusername/Desktop/geo-data.csv";
            
            try
            {
                using (StreamReader streamReader = new StreamReader(filePath))
                {
                    while ((filePath = streamReader.ReadLine()) != null)
                    {
                        codeSearch.Build(new StreamReader (new FileStream(filePath, FileMode.Open, FileAccess.Read)));
                        
                    }
                }
            }
            catch(Exception exp)
            {
                Console.WriteLine(exp.Message);
            }
            Console.WriteLine($"ZIPCodeSearch-App");

            string value;
            while ((value = Console.ReadLine()) != "")
            {
                var scanned = codeSearch.Classify(value);
                Console.WriteLine($"Stadt: {codeSearch.Classify(value)} unbekannt");
                Console.WriteLine($"Land:{codeSearch.Classify(value)}");
            }
        }

`

I still don't know how to add the length check in here (maybe something like "long length = streamReader.BaseStream.Length;"). But this code gave me some another error I have never seen yet:

Could not find file '/Users/myusername/RiderProjects/ZIPCodeSuche_RotesBuch/ZIPCodeSuche_RotesBuch/bin/Debug/net6.0/state_fips,state,state_abbr,zipcode,county,city'."""

Could not find file '/Users/myusername/RiderProjects/ZIPCodeSuche_RotesBuch/ZIPCodeSuche_RotesBuch/bin/Debug/net6.0/state_fips,state,state_abbr,zipcode,county,city'."""

Could not find file '/Users/myusername/RiderProjects/ZIPCodeSuche_RotesBuch/ZIPCodeSuche_RotesBuch/bin/Debug/net6.0/state_fips,state,state_abbr,zipcode,county,city'."""

Could not find file '/Users/myusername/RiderProjects/ZIPCodeSuche_RotesBuch/ZIPCodeSuche_RotesBuch/bin/Debug/net6.0/state_fips,state,state_abbr,zipcode,county,city'."""

`

M

morry329#OP•2/22/23, 2:04 PM

So I think the problem shifted from the index out of range to something else (most likely the invalid file path referenced somewhere in the code). What do you think?

M

morry329#OP•2/22/23, 2:04 PM

@TheBoxyBear

T

TheBoxyBear•2/22/23, 3:00 PM

Without a drive letter in the path, the path is relative to the location of the executable

T

TheBoxyBear•2/22/23, 3:01 PM

For the length check, it's as simple as checking

args.Length > 0

args.Length > 0

args.Length > 0

args.Length > 0

M

morry329#OP•2/22/23, 4:19 PM

I am on MacBook, so my computer does not have a drive letter in the path(C:, F: you mean any of these right?).
I have made a few more changes to my code:

`
static void Main(string[] args)
        {

            var codeSearch = new ZIPCodeSearch();
            string filePath = @"/Users/myname
/Desktop/geo-data.csv";
            
            try
            {
                //using (StreamReader streamReader = new StreamReader(filePath))
                using (StreamReader streamReader = new StreamReader(filePath))
                {
                    while ((filePath = streamReader.ReadLine()) != null && args.Length > 0)
                    {
                        codeSearch.Build(new StreamReader(args[0], Encoding.Default));
                        
                    }
                }
            }
            catch(Exception exp)
            {
                Console.WriteLine(exp.Message);
            }
            Console.WriteLine($"ZIPCodeSearch-App");

            string value;
            while ((value = Console.ReadLine()) != "")
            {
                var scanned = codeSearch.Classify(value);
                Console.WriteLine($"Stadt: {codeSearch.Classify(value)} unbekannt");
                Console.WriteLine($"Land:{codeSearch.Classify(value)}");
            }
        }

`
static void Main(string[] args)
        {

            var codeSearch = new ZIPCodeSearch();
            string filePath = @"/Users/myname
/Desktop/geo-data.csv";
            
            try
            {
                //using (StreamReader streamReader = new StreamReader(filePath))
                using (StreamReader streamReader = new StreamReader(filePath))
                {
                    while ((filePath = streamReader.ReadLine()) != null && args.Length > 0)
                    {
                        codeSearch.Build(new StreamReader(args[0], Encoding.Default));
                        
                    }
                }
            }
            catch(Exception exp)
            {
                Console.WriteLine(exp.Message);
            }
            Console.WriteLine($"ZIPCodeSearch-App");

            string value;
            while ((value = Console.ReadLine()) != "")
            {
                var scanned = codeSearch.Classify(value);
                Console.WriteLine($"Stadt: {codeSearch.Classify(value)} unbekannt");
                Console.WriteLine($"Land:{codeSearch.Classify(value)}");
            }
        }

`
static void Main(string[] args)
        {

            var codeSearch = new ZIPCodeSearch();
            string filePath = @"/Users/myname
/Desktop/geo-data.csv";
            
            try
            {
                //using (StreamReader streamReader = new StreamReader(filePath))
                using (StreamReader streamReader = new StreamReader(filePath))
                {
                    while ((filePath = streamReader.ReadLine()) != null && args.Length > 0)
                    {
                        codeSearch.Build(new StreamReader(args[0], Encoding.Default));
                        
                    }
                }
            }
            catch(Exception exp)
            {
                Console.WriteLine(exp.Message);
            }
            Console.WriteLine($"ZIPCodeSearch-App");

            string value;
            while ((value = Console.ReadLine()) != "")
            {
                var scanned = codeSearch.Classify(value);
                Console.WriteLine($"Stadt: {codeSearch.Classify(value)} unbekannt");
                Console.WriteLine($"Land:{codeSearch.Classify(value)}");
            }
        }

`
static void Main(string[] args)
        {

            var codeSearch = new ZIPCodeSearch();
            string filePath = @"/Users/myname
/Desktop/geo-data.csv";
            
            try
            {
                //using (StreamReader streamReader = new StreamReader(filePath))
                using (StreamReader streamReader = new StreamReader(filePath))
                {
                    while ((filePath = streamReader.ReadLine()) != null && args.Length > 0)
                    {
                        codeSearch.Build(new StreamReader(args[0], Encoding.Default));
                        
                    }
                }
            }
            catch(Exception exp)
            {
                Console.WriteLine(exp.Message);
            }
            Console.WriteLine($"ZIPCodeSearch-App");

            string value;
            while ((value = Console.ReadLine()) != "")
            {
                var scanned = codeSearch.Classify(value);
                Console.WriteLine($"Stadt: {codeSearch.Classify(value)} unbekannt");
                Console.WriteLine($"Land:{codeSearch.Classify(value)}");
            }
        }

M

morry329#OP•2/22/23, 4:21 PM

The index out of range error is gone now, so your advice to add length check worked (I think). This app still has problems, but I will set up another thread separately. Thank you so much for the guidance

A

Accord•3/9/23, 6:11 PM

Was this issue resolved? If so, run

/close

/close

otherwise I will mark this as stale and this post will be archived until there is new activity.