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