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c#formattingdecimal
CyberDude
CyberDude

Reputation: 9009

Special decimal formatting

Is there a string format that can be used on a decimal so that the following results are obtained?

123 => "123"
123.4 => "123.40"
123.45 => "123.45"
123.456 => "123.46"

In English, the number should always be displayed with exactly two decimals, except when it holds an integer value, when it should have no decimals (so no "123.00" displays are allowed).

Upvotes: 4

Views: 1332

Answers (5)

Mehdi LAMRANI
Mehdi LAMRANI

Reputation: 11607

You should use Math.Round method first and then use a toString() Conversion 

    //123.456 => "123.46"
    myDecimal = Math.Round(myDecimal, 2);

The second parameter being the number of decimal places to round to and then you do the following :

    myDecimal.ToString();

No real need for the N2 actually, this way you display numbers "as is" after rounding, ie, 124 if there is no decimals after point, or 123.46 after rounding 123.456

Upvotes: 0

Clyde
Clyde

Reputation: 8145

Something like this?

public static string ToSpecialFormatString(this decimal val)

  if (val == Math.Floor(val))
  {
    return val.ToString("N0");
  }
  return val.ToString("N2");
}

Upvotes: 0

Jon Skeet
Jon Skeet

Reputation: 1503829

I don't know of any such format, I'm afraid. You might need to use:

string text = (d == (int) d) ? ((int) d).ToString() : d.ToString("N2");

EDIT: The code above will only work when d is in the range between int.MinValue and int.MaxValue. Obviously you can do better than that using long, but if you want to cover the full range of decimal you'll need something a little more powerful.

Upvotes: 1

dustyburwell
dustyburwell

Reputation: 5813

You can use "#.##" as your format string. So:

123.23.ToString("#.##") => 123.23
123.00.ToString("#.##") => 123

One caveat is that:

123.001.ToString("#.##") => 123

But whether or not that's acceptable is up to you.

Upvotes: 0

Anthony Pegram
Anthony Pegram

Reputation: 126982

Perhaps not ideal, but a starting point. Simply format to 2 decimal places and replace any .00 with an empty string.

decimal a = 123;
decimal b = 123.4M;
decimal c = 123.456M;

Debug.Assert(a.ToString("0.00").Replace(".00", "") == "123");
Debug.Assert(b.ToString("0.00").Replace(".00", "") == "123.40");
Debug.Assert(c.ToString("0.00").Replace(".00", "") == "123.46");

Upvotes: 0

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