How to make sure a zero is always at the end

I need t开发者_开发问答o make sure that a double always ends with 0

6 = 6.0  
5.9876577878 = 5.98765778780

I tried the format but did not bring the expected result.

How can this be done?

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Not sure if the String.Format method allows you to do this. Here's something you can do though:

public static class DoubleUtils {
    public static String EnsureEndsWithZero(this double value) {
        String str = value.ToString();
        if(!str.EndsWith("0")) {
            if(str.Contains(".")) {
                str += "0";
            } else {
                str += ".0";
            }
        }
        return str;
    }
}

Usage:

double val = 10.1;
Console.WriteLine(val.EnsureEndsWithZero());

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Unless you're extremely liberal about how many zeros are at the end of the number (i.e. 1 OR MORE zeros is okay), then I think you'd have to check the resulting string to see if there's a zero after the decimal point, and add one or both if they aren't there.