Protobuf

主要分2种

P1：Google.Protobuf：分v2和v3；

类型对照表v3，地址见这里

Scalar Value Types

A scalar message field can have one of the following types – the table shows the type specified in the .proto file, and the corresponding type in the automatically generated class:

.proto Type	Notes	C++ Type	Java Type	Python Type[2]	Go Type	Ruby Type	C# Type	PHP Type	Dart Type
double		double	double	float	float64	Float	double	float	double
float		float	float	float	float32	Float	float	float	double
int32	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint32 instead.	int32	int	int	int32	Fixnum or Bignum (as required)	int	integer	int
int64	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint64 instead.	int64	long	int/long[3]	int64	Bignum	long	integer/string[5]	Int64
uint32	Uses variable-length encoding.	uint32	int[1]	int/long[3]	uint32	Fixnum or Bignum (as required)	uint	integer	int
uint64	Uses variable-length encoding.	uint64	long[1]	int/long[3]	uint64	Bignum	ulong	integer/string[5]	Int64
sint32	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s.	int32	int	int	int32	Fixnum or Bignum (as required)	int	integer	int
sint64	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s.	int64	long	int/long[3]	int64	Bignum	long	integer/string[5]	Int64
fixed32	Always four bytes. More efficient than uint32 if values are often greater than 228.	uint32	int[1]	int/long[3]	uint32	Fixnum or Bignum (as required)	uint	integer	int
fixed64	Always eight bytes. More efficient than uint64 if values are often greater than 256.	uint64	long[1]	int/long[3]	uint64	Bignum	ulong	integer/string[5]	Int64
sfixed32	Always four bytes.	int32	int	int	int32	Fixnum or Bignum (as required)	int	integer	int
sfixed64	Always eight bytes.	int64	long	int/long[3]	int64	Bignum	long	integer/string[5]	Int64
bool		bool	boolean	bool	bool	TrueClass/FalseClass	bool	boolean	bool
string	A string must always contain UTF-8 encoded or 7-bit ASCII text, and cannot be longer than 232.	string	String	str/unicode[4]	string	String (UTF-8)	string	string	String
bytes	May contain any arbitrary sequence of bytes no longer than 232.	string	ByteString	str	[]byte	String (ASCII-8BIT)	ByteString	string	List<int>

 

V2的类型对照表，见这里

Scalar Value Types

A scalar message field can have one of the following types – the table shows the type specified in the .proto file, and the corresponding type in the automatically generated class:

.proto Type	Notes	C++ Type	Java Type	Python Type[2]	Go Type
double		double	double	float	*float64
float		float	float	float	*float32
int32	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint32 instead.	int32	int	int	*int32
int64	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint64 instead.	int64	long	int/long[3]	*int64
uint32	Uses variable-length encoding.	uint32	int[1]	int/long[3]	*uint32
uint64	Uses variable-length encoding.	uint64	long[1]	int/long[3]	*uint64
sint32	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s.	int32	int	int	*int32
sint64	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s.	int64	long	int/long[3]	*int64
fixed32	Always four bytes. More efficient than uint32 if values are often greater than 228.	uint32	int[1]	int/long[3]	*uint32
fixed64	Always eight bytes. More efficient than uint64 if values are often greater than 256.	uint64	long[1]	int/long[3]	*uint64
sfixed32	Always four bytes.	int32	int	int	*int32
sfixed64	Always eight bytes.	int64	long	int/long[3]	*int64
bool		bool	boolean	bool	*bool
string	A string must always contain UTF-8 encoded or 7-bit ASCII text.	string	String	unicode (Python 2) or str (Python 3)	*string
bytes	May contain any arbitrary sequence of bytes.	string	ByteString	bytes	[]byte

 

V3的用法

1、NET4.5的项目，安装Nuget包<Google.Protobuf>和<Google.Protobuf.Tools>

2、编写proto文件，类型参照上文定义；放一个demo.proto

syntax = "proto3";
package protobuf_unittest_import;
option csharp_namespace = "Export.DAL";

message ListFloat
{
repeated float items =1;
}

message CircleInfoBuf
    {
         int32 No =1;
         string Name =2;
         float Diameter =3;
         float Length =4;
         ListFloat Points =5;
    }

3、运行\packages\Google.Protobuf.Tools.3.9.1\tools\windows_x64下的protoc.exe，执行命令，转成cs代码；

protoc.exe --proto_path=所在目录 --csharp_out=生成的目录   demo.proto 

4、引用此cs文件，编写其他代码

5、序列化和反序列化

序列化

            string bufFile = "";
            using (FileStream fs = new FileStream(bufFile, FileMode.CreateNew))
            {
                using (CodedOutputStream cos = new CodedOutputStream(fs))
                {
                    list.WriteTo(cos);//需序列化的对象
                    fs.Flush();
                }
            }

反序列化

            using (FileStream fs = new FileStream(bufFile, FileMode.Open))
            {
                using (CodedInputStream cos = new CodedInputStream(fs))
                {
                    CircleInfoBuf list = CircleInfoBuf.Parser.ParseFrom(cos);
                    return list;
                }
            }

 

P2：protobuf-net

1、定义类

 

来源：https://www.cnblogs.com/feedback/p/11352520.html