C#•14mo ago

❔ I need help to convert a string type of textbox text to int

I have a textbox to enter a number then I wanna get number in a int variable

20 Replies

Haze.•14mo ago

What have you tried so far?

mkpast•14mo ago

System.Convert.ToInt32(Txt.Text) int x = int.Parse(Txt.Text) it gives me errors System.FormatException: 'Input string was not in a correct format.' how can i fix it? can you help me? @Haze.

Sumit Shekhawat•14mo ago

@ǃ THE REAL DRAGON AKUMA when you get value from textbox, is this in decimal format? Like 1.00

mkpast•14mo ago

no it's int like 32

Sumit Shekhawat•14mo ago

int x = Convert.ToInt32(Txt.Text);

mkpast•14mo ago

I tried it but it didn't work

Sumit Shekhawat•14mo ago

This statement should be work. also you can remove extra spaces if any come with using Trim() Method like Txt.Text.Trim()

cap5lut•14mo ago

generally speaking, u shouldnt use Convert for this, but instead int.TryParse(string, out int):

if (int.TryParse(Txt.Text, out int number)
{
  // do something with the number
}
else
{
  // handle that the number wasnt parsable
}

if (int.TryParse(Txt.Text, out int number)
{
  // do something with the number
}
else
{
  // handle that the number wasnt parsable
}

but besides that i guess its what sumit is thinking: random whitespaces, so sanitizing the input before passing it would be the correct way TryParse(...) (and usually all these TrySomething(...) methods) return a bool value if it succeeded or not. the out is a bit complexer: imagine i would have instead written:

int number;
if (int.TryParse(Txt.Text, out number)
// ...

int number;
if (int.TryParse(Txt.Text, out number)
// ...

the out basically means, that the method TryParse will assign a value to the given variable (number), which u can then use to further process ur stuff. having it out int number instead just means that its declaring the variable there, instead of before the if (its mainly syntactical sugar ;p)

Cattywampus•14mo ago

don't use convert, use tryparse instead you can do it like this for example

MODiX•14mo ago

SlimStv#2835

REPL Result: Success

string str = "123ABC";
int tmp = 0;
Int32.TryParse(Regex.Replace(str, "[^0-9]",""), out tmp);
Console.WriteLine(tmp);

string str = "123ABC";
int tmp = 0;
Int32.TryParse(Regex.Replace(str, "[^0-9]",""), out tmp);
Console.WriteLine(tmp);

Console Output

Compile: 578.933ms | Execution: 35.671ms | React with ❌ to remove this embed.

Cattywampus•14mo ago

depends on your setup, you may not need the regex there

mkpast•14mo ago

thanks u

cap5lut•14mo ago

i mentioned it already this as is, i wouldnt recommend tho. its valid to complain to the user that their input is garbage ;p (especially since that example is a valid integer in hex format ;p)

Cattywampus•14mo ago

if it answers your question @ǃ THE REAL DRAGON AKUMA you can close this

mkpast•14mo ago

ok wait i'm copying codes

Cattywampus•14mo ago

yeah based on your posted code, you'd need to make sure that they're all numbers my code would bypass that but in production, you don't want that you can check if your string contains numbers o via char.IsDigit

cap5lut•14mo ago

its all a matter of how vague u want to allow the user input. for explicit stuff, use the TryParse method. after that comes more complecity, sanitizing strings, culture based input formats and so on. given ur current knowledge i would say trimming whitespaces to sanitize and TryParse is what u should go for if u do not have further questions, remember to $close the thread 😉

MODiX•14mo ago

Use the /close command to mark a forum thread as answered

cap5lut•14mo ago

ofc if u have more question regarding this topic ask ;p i have explained the out part in more detail here if u want a deeper understanding of it: https://discord.com/channels/143867839282020352/1105905561591087144/1106118506803634246

Accord•14mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ I need help to convert a string type of textbox text to int