C# 读取bytes——工具类
https://referencesource.microsoft.com/#mscorlib/system/text/stringbuildercache.cs
https://referencesource.microsoft.com/#mscorlib/system/io/binaryreader.cs
https://referencesource.microsoft.com/#mscorlib/system/text/stringbuildercache.cs
https://referencesource.microsoft.com/#mscorlib/system/io/binaryreader.cs