C# excepcion in code

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Hi, I'm passing a code from vb to c # and I get some exceptions and I do not know how to solve them. I'm new to c # could you help me?

int Arrcount = new int();
 long I;
 string[] TempArray = new string[TheString.Length - 1 / StringLen];
 for (I = 1; I <= TheString.Length; I += StringLen)
 {
     TempArray[Arrcount] = Strings.Mid(TheString, StringLen);
     Arrcount++;
 }
 return TempArray;eturn TempArray;

code visual basic:

Public Function SplitString(ByVal TheString As String, ByVal StringLen As Integer) As String()
    Dim ArrCount As Integer  'as it is declared locally, it will automatically reset to 0 when this is called again
    Dim I As Long  'we are going to use it.. so declare it (with local scope to avoid breaking other code)
    Dim TempArray() As String
    ReDim TempArray((Len(TheString) - 1) \ StringLen)
    For I = 1 To Len(TheString) Step StringLen
        TempArray(ArrCount) = Mid$(TheString, I, StringLen)
        ArrCount = ArrCount + 1
    Next
    SplitString = TempArray   'actually return the value
End Function

The exception that appears to me is here:

string[] TempArray = new string[TheString.Length - 1 / StringLen];

could you help me, maybe I'll pass the code to C # wrong or what would be solved this exception
Object reference not set to an instance of an object.

What I have tried:

I tried to put a try catch but it did not help, maybe I had some error in passing the code could you help me please?

Posted 16-Apr-18 5:45am

Member 13782384

Updated 16-Apr-18 8:18am

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OriginalGriff · Answer 1 · 2018-04-16T06:11:00

This is one of the most common problems we get asked, and it's also the one we are least equipped to answer, but you are most equipped to answer yourself.

Let me just explain what the error means: You have tried to use a variable, property, or a method return value but it contains null - which means that there is no instance of a class in the variable.
It's a bit like a pocket: you have a pocket in your shirt, which you use to hold a pen. If you reach into the pocket and find there isn't a pen there, you can't sign your name on a piece of paper - and you will get very funny looks if you try! The empty pocket is giving you a null value (no pen here!) so you can't do anything that you would normally do once you retrieved your pen. Why is it empty? That's the question - it may be that you forgot to pick up your pen when you left the house this morning, or possibly you left the pen in the pocket of yesterdays shirt when you took it off last night.

We can't tell, because we weren't there, and even more importantly, we can't even see your shirt, much less what is in the pocket!

Back to computers, and you have done the same thing, somehow - and we can't see your code, much less run it and find out what contains null when it shouldn't.
But you can - and Visual Studio will help you here. Run your program in the debugger and when it fails, VS will show you the line it found the problem on. You can then start looking at the various parts of it to see what value is null and start looking back through your code to find out why. So put a breakpoint at the beginning of the method containing the error line, and run your program from the start again. This time, VS will stop before the error, and let you examine what is going on by stepping through the code looking at your values.

But we can't do that - we don't have your code, we don't know how to use it if we did have it, we don't have your data. So try it - and see how much information you can find out!

John R. Shaw · Answer 2 · 2018-04-16T08:19:00

(1) Change

string[] TempArray = new string[TheString.Length - 1 / StringLen];

to

string[] TempArray = new string[(TheString.Length - 1) / StringLen];

to match VB code

ReDim TempArray((Len(TheString) - 1) \ StringLen)

(2) The indexing is zero based in C#, so, to avoid an exception, you probably need to change

for (I = 1; I <= TheString.Length; I += StringLen)

to

for (I = 0; I < TheString.Length; I += StringLen)

(3) Use the C# string classes Mid method

TempArray[Arrcount] = TheString.Mid(I, StringLen);

(4) Don't assume a one to one translation, verify function/method usage and language equivalencies. Then start debugging - the unit test is your friend.

C# excepcion in code

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