一个非常低级的方法，但我相信这将是最高效的方法，只使用快速整数计算(没有缓慢的字符串解析和区域性敏感的方法):

public static decimal Normalize(this decimal d)
{
    int[] bits = decimal.GetBits(d);

    int sign = bits[3] & (1 << 31);
    int exp = (bits[3] >> 16) & 0x1f;

    uint a = (uint)bits[2]; // Top bits
    uint b = (uint)bits[1]; // Middle bits
    uint c = (uint)bits[0]; // Bottom bits

    while (exp > 0 && ((a % 5) * 6 + (b % 5) * 6 + c) % 10 == 0)
    {
        uint r;
        a = DivideBy10((uint)0, a, out r);
        b = DivideBy10(r, b, out r);
        c = DivideBy10(r, c, out r);
        exp--;
    }

    bits[0] = (int)c;
    bits[1] = (int)b;
    bits[2] = (int)a;
    bits[3] = (exp << 16) | sign;
    return new decimal(bits);
}

private static uint DivideBy10(uint highBits, uint lowBits, out uint remainder)
{
    ulong total = highBits;
    total <<= 32;
    total = total | (ulong)lowBits;

    remainder = (uint)(total % 10L);
    return (uint)(total / 10L);
}

试试下面的代码:

string value = "100";
value = value.Contains(".") ? value.TrimStart('0').TrimEnd('0').TrimEnd('.') : value.TrimStart('0');

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

我使用这个代码来避免“G29”科学符号:

public static string DecimalToString(this decimal dec)
{
    string strdec = dec.ToString(CultureInfo.InvariantCulture);
    return strdec.Contains(".") ? strdec.TrimEnd('0').TrimEnd('.') : strdec;
}

编辑:使用系统CultureInfo.NumberFormat.NumberDecimalSeparator:

public static string DecimalToString(this decimal dec)
{
    string sep = CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator;
    string strdec = dec.ToString(CultureInfo.CurrentCulture);
    return strdec.Contains(sep) ? strdec.TrimEnd('0').TrimEnd(sep.ToCharArray()) : strdec;
}

其他答案:

在WPF应用程序中使用XAML你可以使用

{Binding yourDecimal, StringFormat='#,0.00#######################'}

上面的答案将在某些情况下保留0，因此您仍然可以返回2.00

{Binding yourDecimal, StringFormat='#,0.#########################'}

如果要删除所有后面的零，请相应地进行调整。

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
=>