Find packages generated project directory execute commands in this directory:
D:\Users\Download\Blog-master\Blog-master\gRPCDemo\packages\Grpc.Tools.1.0.0\tools\windows_x86\protoc.exe -gRPCDemo --csharp_out gRPCDemo gRPCDemo\XXX.proto --grpc_out gRPCDemo --plugin=protoc-gen-grpc=packages\Grpc.Tools.1.0.0\tools\windows_x86\grpc_csharp_plugin.exe