Format double value to fixed length string

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  12 years ago

  by GregaR

  GregaR

  , Slovenia

  Joined 13 years ago

  Hi all,

  I have a question on formating double values to string...I know how to do it for fixed length of decimals but I cannot find a way how to format it so that a value will always have 4 numbers and depending on that value how many decimals there will be.

   
  

  For example i have a value 125.46458645 which I want to format to 125.5

  and value 12.54654747654 which I want to format to 12.55

  and value 1.254656555 to 1.255

  Thanks

  Best regards

  Grega 

  
  
   

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  12 years ago

  by m8mbl

  Man-Bun Lee

  , United Kingdom

  Joined 13 years ago

  There are quite a few ways to achieve what you want, although you will have to type your result back to Decimal/Double afterwards. The problem is you are formatting the number, which can only be done via string manipulation. I'm sure there is a more direct approach, but I couldn't be bothered reading about Number Styles. Anyhoo.

  Use String.Format("{0:F3}", 124.5)

  Or MyDecimalValue.ToString("##.####")

  The first method uses format specifiers, and there are many types to coincide with various formats, but if you just take the method, F3 = 3 decimal places.

  The second method uses placeholders to format the text, and you just use the necessary amount of string[#] to act as a placeholder for the required number format. Don't forget to type the result back to Decimal/Double.

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