string.Format("{0:G29}", decimal.Parse("2.00"))

string.Format("{0:G29}", decimal.Parse(Your_Variable))

像这样试试

string s = "2.4200";

s = s.TrimStart("0").TrimEnd("0", ".");

然后把它转换成浮点数

我从http://dobrzanski.net/2009/05/14/c-decimaltostring-and-how-to-get-rid-of-trailing-zeros/上找到了一个优雅的解决方案

基本上

decimal v=2.4200M;

v.ToString("#.######"); // Will return 2.42. The number of # is how many decimal digits you support.

string.Format("{0:G29}", decimal.Parse("2.00"))

string.Format("{0:G29}", decimal.Parse(Your_Variable))

下面的代码将能够删除后面的0。我知道这很难，但很有效。

private static string RemoveTrailingZeros(string input) 
{
    for (int i = input.Length - 1; i > 0; i-- )
    {
        if (!input.Contains(".")) break;
        if (input[i].Equals('0'))
        {
            input= input.Remove(i);
        }
        else break;
    }
    return input;
}

尝试做更友好的解决方案DecimalToString (https://stackoverflow.com/a/34486763/3852139):

private static decimal Trim(this decimal value)
{
    var s = value.ToString(CultureInfo.InvariantCulture);
    return s.Contains(CultureInfo.InvariantCulture.NumberFormat.NumberDecimalSeparator)
        ? Decimal.Parse(s.TrimEnd('0'), CultureInfo.InvariantCulture)
        : value;
}

private static decimal? Trim(this decimal? value)
{
    return value.HasValue ? (decimal?) value.Value.Trim() : null;
}

private static void Main(string[] args)
{
    Console.WriteLine("=>{0}", 1.0000m.Trim());
    Console.WriteLine("=>{0}", 1.000000023000m.Trim());
    Console.WriteLine("=>{0}", ((decimal?) 1.000000023000m).Trim());
    Console.WriteLine("=>{0}", ((decimal?) null).Trim());
}

输出:

=>1
=>1.000000023
=>1.000000023
=>