How to limit a decimal number?

Question

Possible Duplicate:
How to format a decimal

How can I limit my decimal number so I'll get only 3 digits after the point?

e.g  2.774

Answer 1

Math.Round Method (Decimal, Int32)

Example:

Math.Round(3.44, 1); //Returns 3.4.

Answer 2

Use Math.Round to round it to 3 decimal places.

Answer 3

Limiting the precision of a floating point number is a SQL concept. Decimal in csharp only means that it will remember the precision assigned. You can round to three decimal places before assigning. IE, Math.Round().

Answer 4

I'm assuming you really mean formatting it for output:

Console.WriteLine("{0:0.###}", value);

Answer 5

To get Decimal back use Math.Round with Second parameter specifying number of decimal points.

decimal d = 54.9700M;

decimal f = (Math.Round(d, 2)); // 54.97

To Get String representation of number use .ToString() Specifiying Decimal Points as N3. Where 3 is the decimal points

decimal d = 54.9700M;

string s = number.ToString("N3"); // "54.97"

Answer 6

Part of my answer is the response, another part is just a interesting point:

I often want to see the variable as a prop/field. So a create a extension method to solve my problem:

*Tensao is just an Enum that have a value related.

public static class TensaoExtensions {
    public static double TensaoNominal(this Tensao tensao) {
        return Math.Round((double.Parse(EnumMapper.Convert(typeof(Tensao), tensao.ToString()))) * 1000 / Math.Sqrt(3), 3);
    }
}