C#•2w 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

Citrus limon•2w ago

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

qqdev•2w ago

The lastname has only 5 characters

Citrus limon•2w ago

yeah The counting feels confusing like

qqdev•2w ago

Is this an assignment?

Citrus limon•2w ago

no just me watching tutorials and doing random stuff

qqdev•2w ago

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

Citrus limon•2w ago

i dont get it.....

qqdev•2w 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

Citrus limon•2w ago

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

qqdev•2w ago

https://dotnetfiddle.net/z0WSnK

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Citrus limon•2w ago

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

qqdev•2w ago

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

Citrus limon•2w ago

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

qqdev•2w ago

Exactly

Citrus limon•2w ago

and second number is the lenght

qqdev•2w 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

Citrus limon•2w ago

where do i find it?

qqdev•2w 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)

Citrus limon•2w ago

this pops out for me

Citrus limon•2w ago

qqdev•2w ago

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

Citrus limon•2w ago

yeah ahh thx man you helped me out i appreciate it

qqdev•2w ago

You are welcome!

Citrus limon•2w ago

found the coding dictionary :D

qqdev•2w ago

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

Citrus limon•2w ago

C# holybook

qqdev•2w ago

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