运行带有错误的C＃protobuf示例

Question

Newbie in C#, I installed Rider on MacOS and installed Google.Protobuf and protobuf-net in the solution. And I find the example of C# protobuf on link , and add the files into the solution. However, when I compile the .cs files, I got those errors.

Addressbook.cs(263, 57): [CS1615] Argument 1 may not be passed with the 'ref' keyword
Addressbook.cs(445, 61): [CS1615] Argument 1 may not be passed with the 'ref' keyword
Addressbook.cs(580, 57): [CS1615] Argument 1 may not be passed with the 'ref' keyword

So how to solve these problems?

Answer 1

It seems like the methods argument do not accept a reference: ref argument ;

To resolve this issue make sure to remove the ref before the arguments in the lines 263, 445, 580 of the Addressbook.cs file.

example given:

if (!pb::UnknownFieldSet.MergeFieldFrom(ref _unknownFields, input)) {
          return;
}

should be:

if (!pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input)) {
          return;
}

Answer 2

By comparing the official examples and protoc --csharp_out files, I found that the difference appears in the clause mentioned by @nnty. In the official examples, that clause is replaced by

_unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);

so change all the error place with above sentence may help solve the problem.