重写的话，约定基类方法必须先执行
public virtual void PackageRouter<TWriter>(
ref TWriter writer
)
where TWriter : IBytesWriter
Public Overridable Sub PackageRouter(Of TWriter As IBytesWriter) (
ByRef writer As TWriter
)abstract PackageRouter :
writer : 'TWriter byref -> unit when 'TWriter : IBytesWriter
override PackageRouter :
writer : 'TWriter byref -> unit when 'TWriter : IBytesWriter[缺少 "M:TouchSocket.Core.RouterPackage.PackageRouter``1(``0@)" 的 <param name="writer"/> 文档]
[缺少 "M:TouchSocket.Core.RouterPackage.PackageRouter``1(``0@)" 的 <typeparam name="TWriter"/> 文档]