Question

I have a method that takes in 2 numbers. The first number is the value that I want to set (or format) and the second number is the precision to use.

public double ReduceNumber(double Test, int Precision)
{
}

Let’s say I pass in the parameters 125.6023867 and 4. I would like the return value to be 125.6023. I know how to use the FormatNumber() function in VB but now that I am trying to convert to C# I am drawing a blank. All that I can find online is String.Format() which helps but I don’t know how to code for a format that can change regularly.

Answer 1

A formatted string:

public string ReduceNumber(double Test, int Precision)
{
    return Test.ToString(string.Format("F{0}", Precision));
}

This is using the standard numeric format string “F” with a precision specifier.

A rounded double:

public double ReduceNumber(double Test, int Precision)
{
    return Math.Round(Test, Percision);
}

A point about style – parameter names are normally pascalCase in C#.