C#•3d ago

Help new to c# and need explanation with substring

Hey everyone I just started coding but now I'm learning about .IndexOf and substring I just don't know how it works. Like for example I wanted to do Initials (Take the first letter of the first name[text box 1]and the 2 first letters of the last name[text box 2]) as well as in 1 single textbox the initials same as before but it's not the same so can anyone please help me with this code 😭🙏🏿 Things I use -Visual studio -WindowsFormsApp -c#

22 Replies

~Nost~OP•3d ago

This is how my form looks like and what I wanna program. I want the initials to come in label3 and label5

Angius•3d ago

https://learn.microsoft.com/en-us/dotnet/api/system.string.substring?view=net-8.0

String.Substring Method (System)

Retrieves a substring from this instance. This member is overloaded. For complete information about this member, including syntax, usage, and examples, click a name in the overload list.

Angius•3d ago

You want .Substring(0, 1) and .Substring(0, 2) respectively Or [0] and [..2]

MODiX•3d ago

Angius

REPL Result: Success

record Person(string First, string Last);
var people = new Person[]{
  new("Bob", "Ross"),
  new("Margaret", "Thatcher"),
  new("Bill", "Gates"),
  new("Harry", "Potter"),
  new("Commandor", "Shepard"),
};

foreach (var person in people)
{
    var fni = person.First[0];
    var lni = person.Last[..2];
    Console.WriteLine($"{person.First} {person.Last} — {fni}{lni}");
}

record Person(string First, string Last);
var people = new Person[]{
  new("Bob", "Ross"),
  new("Margaret", "Thatcher"),
  new("Bill", "Gates"),
  new("Harry", "Potter"),
  new("Commandor", "Shepard"),
};

foreach (var person in people)
{
    var fni = person.First[0];
    var lni = person.Last[..2];
    Console.WriteLine($"{person.First} {person.Last} — {fni}{lni}");
}

Console Output

Bob Ross — BRo
Margaret Thatcher — MTh
Bill Gates — BGa
Harry Potter — HPo
Commandor Shepard — CSh

Bob Ross — BRo
Margaret Thatcher — MTh
Bill Gates — BGa
Harry Potter — HPo
Commandor Shepard — CSh

Compile: 607.561ms | Execution: 80.195ms | React with ❌ to remove this embed.

Angius•3d ago

Try it with substring

~Nost~OP•2d ago

Yes I know this but my problem is just what variable do I use and what about the indexOf because I need to use that one too But anyways thank you for the help this far

Angius•2d ago

You have no use for IndexOf() here It exists to find a location of a specific character

MODiX•2d ago

Angius

REPL Result: Success

"aaaaaaabaaaaa".IndexOf('b')

"aaaaaaabaaaaa".IndexOf('b')

Result: int

Compile: 343.488ms | Execution: 22.406ms | React with ❌ to remove this embed.

Angius•2d ago

Not useful when creating initials

~Nost~OP•2d ago

What about it with the first and last name in one textbox can I not use lastindexOf to locate the last space and then use substring for those initials??

Angius•2d ago

Sure

~Nost~OP•2d ago

Or how would you suggest doing it

Angius•2d ago

Well, .Substring() takes start index and length As per the docs So... the last name part would go from the index of the space To the length of two

~Nost~OP•2d ago

I'll try my best thank you for the help

~Nost~OP•2d ago

@Angius

Angius•2d ago

Does it work? Also, the textbox text is already a string, no need to convert it

~Nost~OP•2d ago

Well ye but it's not all capital letters (only the last letter) can I do somewhere do a ToUpper?? And if so where

Angius•2d ago

You can use toupper on any string So use it where needed On that combined string for example

~Nost~OP•2d ago

Uh? So how do I do the result to upper then

Angius•2d ago

(a+b).ToUpper()?

~Nost~OP•2d ago

Omg thank you so much lmao now the other half @Angius OMG IT WORKED FINALLY THANK YOU!!!!!!! Oh and btw I just noticed your profile you do YouTube and I used to watch your videos (if it's you) very long but entertaining so ye keep up the amazing work dude

felsokning•2d ago

Don't forget to mark it as solved. 😃

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Help new to c# and need explanation with substring