protobuf-net can't send Negative number

问题

    [Required]
    [DefaultValue(-1)]

    public int MvcUserId { get; set; }

when I set MvcUserId =-1; but I will get MvcUserId =0; if i use json serlize the object ,everything will be ok.

回答1:

You need to actually apply the default:

[Required]
[DefaultValue(-1)]
public int MvcUserId { get; set; } = -1;

Without that protobuf-net ignores the value on send (because it is the default), and on receive there is nothing to process. protobuf-net assumes that your code correctly applies the defaults.

来源：https://stackoverflow.com/questions/41692470/protobuf-net-cant-send-negative-number