C#•5mo ago

✅ How do I get rid of 'System.ArgumentOutOfRangeException'

here the 'l'astname' substring doesnt come as output because of this exception can someone help me fix it?

28 Replies

Let's look at the docs (https://learn.microsoft.com/en-us/dotnet/api/system.string.substring?view=net-8.0#system-string-substring(system-int32-system-int32)):

public string Substring (int startIndex, int length); length Int32 The number of characters in the substring.

It's a length, not an end index

Kit N KatOP•5mo ago

that means if i write 7,12 it would work?

qqdev•5mo ago

The lastname has only 5 characters

Kit N KatOP•5mo ago

yeah The counting feels confusing like

qqdev•5mo ago

Is this an assignment?

Kit N KatOP•5mo ago

no just me watching tutorials and doing random stuff

qqdev•5mo ago

Because you could also just split at the white space (" ") Which would work with every name Assuming there is no middle name

Kit N KatOP•5mo ago

i dont get it.....

qqdev•5mo ago

var fullname = "jasmini salty";
var split = fullname.Split(" ");
var firstname = split[0];
var lastname = split[1];

var fullname = "jasmini salty";
var split = fullname.Split(" ");
var firstname = split[0];
var lastname = split[1];

Kinda like that

Kit N KatOP•5mo ago

i dont know the split yet so i was doing it with substring

qqdev•5mo ago

https://dotnetfiddle.net/z0WSnK

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Kit N KatOP•5mo ago

but i think i didnt get the full concept of substring right

qqdev•5mo ago

Yeah, the 2nd parameter of Substring(...) is the length Not an index As canton7 pointed out

Kit N KatOP•5mo ago

oh i get it so basically the first nukbe ris starting point

qqdev•5mo ago

Exactly

Kit N KatOP•5mo ago

and second number is the lenght

qqdev•5mo ago

I strongly recommend to add parameter hints here Like the following

var firstname = fullname.Substring(startIndex: 0, length: 7);

var firstname = fullname.Substring(startIndex: 0, length: 7);

Makes it more readable

Kit N KatOP•5mo ago

where do i find it?

qqdev•5mo ago

The naming of the parameter hints has to follow the method signature https://learn.microsoft.com/en-us/dotnet/api/system.string.substring?view=net-8.0#system-string-substring(system-int32-system-int32)

Kit N KatOP•5mo ago

this pops out for me

Kit N KatOP•5mo ago

qqdev•5mo ago

You tried to create a substring which exceeds the boundaries of the string

Kit N KatOP•5mo ago

yeah ahh thx man you helped me out i appreciate it

qqdev•5mo ago

You are welcome!

Kit N KatOP•5mo ago

found the coding dictionary :D

qqdev•5mo ago

Haha, exactly Visual Studio should also be able to tell you the parameter names

Kit N KatOP•5mo ago

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qqdev•5mo ago

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✅ How do I get rid of 'System.ArgumentOutOfRangeException'