c# - 什么是 ToString ("N0") 格式？

Question

此代码来自 Charles Pettzold 的“Programming Windows Sixth Edition”一书:

public object Convert(object value, Type targetType, object parameter, string language) 
{ 
    return ((double)value).ToString("N0"); 
}

ToString("N0") 应该打印带有逗号分隔符且没有小数点的值。我在文档中找不到对适当的 ToString 重载和 "N0" 格式的引用。请将我指向 .NET 文档中的正确位置。

Answer 1

检查 following article在 MSDN 上关于 N 格式的例子。这也包含在 Standard Numeric Format Strings 中。文章。

相关摘录:

//       Formatting of 1054.32179:
//          N:                     1,054.32 
//          N0:                    1,054 
//          N1:                    1,054.3 
//          N2:                    1,054.32 
//          N3:                    1,054.322 

When precision specifier controls the number of fractional digits in the result string, the result string reflects a number that is rounded to a representable result nearest to the infinitely precise result. If there are two equally near representable results:

• On the .NET Framework and .NET Core up to .NET Core 2.0, the runtime selects the result with the greater least significant digit (that is, using MidpointRounding.AwayFromZero).
• On .NET Core 2.1 and later, the runtime selects the result with an even least significant digit (that is, using MidpointRounding.ToEven).