1、创建grpc服务器端项目，

2、把项目里的 greet.proto 文件的属性 gRPC Stub Classes  设置为Client and Server，这样，客户端就可以引用，否则，此前度娘无解，

3、greet.proto中的service可以创建多个，例如：

service Greeter {
  // Sends a greeting
  rpc SayHello (HelloRequest) returns (HelloReply);
  rpc SayHello2 (NameVales) returns(NameVales);
}

service Gr2{
	rpc SayH(NameVales)  returns(NameVales);
}

创建多个service后，需要先编译，再在 startup里加入 ：

endpoints.MapGrpcService<Gr2Service>();

 greet.proto分析：

syntax = "proto3";

//本项目的命名空间
option csharp_namespace = "GrpcService3";

//本项目的包名
package greet;


// 服务
service Greeter {
  //功能
  rpc SayHello (HelloRequest) returns (HelloReply);
  rpc SayHello2 (NameVales) returns(NameVales);
}

service Gr2{
	rpc SayH(NameVales)  returns(NameVales);
}
// 以下为各种请求/反馈的类型
message HelloRequest {
  string name = 1;
}

message HelloReply {
  string message = 1;
}
message NameVales{
	string name=1;
	int32 val=2;
}

proto支持的数据类型：

.proto 类型	C++类型	Java类型	Python类型[2][2]	Go类型	Ruby类型	C#类型	PHP类型	Dart类型
double	double	double	float	float64	Float	double	float	double
float	float	float	float	float32	Folat	float	float	double
int32	int32	int	int	int32	Fixnum or Bignum(as required)	int	integer	int
int64	int64	long	int/long[3][3]	int64	Bignum	long	integer/string[5][5]	int64
uint32	uint32	int[1][1]	int/long[3][3]	uint32	Fixnum or Bignum(as required)	uint	integer	int
uint64	uint64	long[1][1]	int/long[3][3]	uint64	Bignum	ulong	integer/string[5][5]}$	int64
sint32	int32	int	int	int32	Fixnum or Bignum(as required)	int	integer	int
sint64	int64	long	int/long[3][3]	int64	Bignum	long	integer/string[5][5]	int64
fixed32	uint32	int[1][1]	int	int32	Fixnum or Bignum(as required)	int	integer	int
fixed64	uint64	long[1][1]	int/long[3][3]	uint64	Bignum	ulong	integer/string[5][5]	int64
sfixed32	uint32	int[1][1]	int	int32	Fixnum or Bignum(as required)	int	integer	int
sfixed64	uint64	long[1][1]	int/long[3][3]	uint64	Bignum	ulong	integer/string[5][5]	int64
bool	bool	boolean	bool	bool	TrueClass/FalseClass	bool	boolean	bool
string	string	String	str/unicode[4][4]	string	String(UTF-8)	string	string	String
bytes	string	ByteString	str	[]byte	String(ASCII-8BIT)	ByteString	string	List<int>

 还可以枚举：

message SearchRequest {
  string query = 1;
  int32 page_number = 2;
  int32 result_per_page = 3;
  enum Corpus {
    UNIVERSAL = 0;
    WEB = 1;
    IMAGES = 2;
    LOCAL = 3;
    NEWS = 4;
    PRODUCTS = 5;
    VIDEO = 6;
  }
  Corpus corpus = 4;
}

4、创建net core wpf项目，NuGet安装 Grpc.Core，

5、引入上面的项目，

6、使用：

            //地址一定要加上端口，否则未知错误
            var channel =new Channel(@"127.0.0.1:80", ChannelCredentials.Insecure);
            //前面说到的proto文件属性一定要设置为server+client，否则，此前度娘无解
            var client = new GrpcService3.Greeter.GreeterClient(channel);

            var c = new GrpcService3.Gr2.Gr2Client(channel);
            var a= c.SayH(new GrpcService3.NameVales());


            var reply = client.SayHello2(new GrpcService3.NameVales { Name = "LineZero",Val=22 });
            var r2 = client.SayHello(new GrpcService3.HelloRequest { Name = "dddddddddd" });