Question

在grpc的原始文件中使用地图作为.net核心，以将字典作为请求参数发送，从而使其在自动生成的代码中成为私有字段（只读）。所以我无法分配字典来映射并在API请求中传递它。我如何使其可读写。？

Sample proto request: 

service xyz{
rpc testTrans(TestRequest) returns (TestResponse);
}
message TestRequest {
  map<string,string> props = 1;
}

所以自动生成的代码如下：

    public const int PropsFieldNumber = 1;

    private static readonly pbc::MapField<string, string>.Codec _map_Props_codec
        = new pbc::MapField<string, string>.Codec(pb::FieldCodec.ForString(10), pb::FieldCodec.ForString(18), 10);

    private readonly pbc::MapField<string, string> Props_ = new pbc::MapField<string, string>();

    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
    public pbc::MapField<string, string> Props {
      get { return Props_; }
    }

所以现在当我尝试按如下所示在请求中分配属性时，它会引发错误： 属性或索引器TestRequest。无法将属性分配给它-只读。

       public static void testTrans(Dictionary<string, string> test)
        {
             var res = client.InitTrans(new TestRequest
                {
                    Props = test
                });
        }

Answer 1

当您要直接声明和初始化值时，似乎已被阻止：

var res = client.InitTrans(new TestRequest
            {
              //Property could not be assigned to -- it is read only...error
              Props = new Map<string,string>.Add("somekey", "somevalue");
              // Alternatively the same problem will also occur when you do
              // Props = new Map<string,string>.Add(SomeDict);
            }

相反，应该变通办法是初始化变量，然后稍后（在整个消息对象初始化之后）将值添加到字典中。

     var res = new TestRequest{};

     //test is some dictionary

     res.TestRequest.Props.Add(test);

     //alternatively you can also add with (key, value)

     res.TestRequest.Props.Add("someKey", "someValue);

.netCore

1 个答案: