Standard numeric format string
https://docs.microsoft.com/zh-cn/dotnet/standard/base-types/standard-numeric-format-strings
Composite format setting
https://docs.microsoft.com/zh-cn/dotnet/standard/base-types/composite-formatting
Common Type System (CTS) Built-in Type Table
https://docs.microsoft.com/zh-cn/dotnet/csharp/language-reference/keywords/ built-in-types-table
C# Tutorial
http://www.runoob.com/csharp/csharp-tutorial.html
Microsoft C# Programming Guide (online)
https://docs.microsoft.com/zh-cn/dotnet/csharp/programming-guide/index
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