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C#

Liam Andersson
Liam Andersson
1,396 Points
Posted by Liam Andersson
Liam Andersson
1,396 Points

RangeAttribute-class?

Hey guys! I have a question for you C# people out there! Do anyone know how to use the RangeAttribute-class? (https://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.rangeattribute(v=vs.110).aspx)

I want to limit the user to only write the numbers 1-5 in my project and I quite didnt understand the RangeAttribute.

Egen.cs in https://w.trhou.se/4oxt1k8ddz

Thansk for any answer!

2 Answers

Steven Parker
Steven Parker
231,261 Points
Steven Parker
Steven Parker
231,261 Points

Attributes like this are only for data-driven applications built on Visual Studio. You won't be able to use them in a simple console application built with the "mono" system.

But it's reasonably easy to test the input and require the user to keep trying while the answer is outside the range:

while (minutes < 1 || minutes > 5) {
    System.Console.WriteLine(minutes + " isn't an acceptable value, please try again!");
    minutes = double.Parse(System.Console.ReadLine());
}

Your code seems to have a test that would do the same thing after you fix its position in the code flow.

Liam Andersson
Liam Andersson
1,396 Points
Liam Andersson
Liam Andersson
1,396 Points

So where exactly does the while statement inside the parentheses mean? And where am I supposed to put this code? I tried putting a similar code to yours outside my other while method but I got errors.

Steven Parker
Steven Parker
231,261 Points
Steven Parker
Steven Parker
231,261 Points

The "while" statement means, "do this for as long as minutes is either less than 1 or greater than 5".

And you might put that loop right after the input is parsed and assigned to "minutes", around line 26 in the snapshot code.

Liam Andersson
Liam Andersson
1,396 Points
Liam Andersson
Liam Andersson
1,396 Points

Nvm I might have figured it out