感谢您的评论和回答.我找到了使用Input和OutputFormatters的解决方案.感谢 http://rovani.net/Explicit-Model-Constructor/指出我朝着正确的方向前进.

Thanks for the comments and answers. I found a solution with Input and outputformatters. With thanks to http://rovani.net/Explicit-Model-Constructor/ to point me in the right direction.

我创建了自己的输入和输出格式器，它们继承自JsonInputFormatter以保持相同的功能.
在构造函数中，我设置了受支持的媒体类型(使用了一些类似JSON的媒体类型).
还必须重写CreateJsonSerializer，以将ContractResolver设置为所需的值(可以实现单例).
必须这样做，因为在构造函数中更改serializerSettings会更改所有输入/输出格式器的序列化器设置，这意味着默认的JSON格式器也将使用新的协定解析器. 同样，这样做也意味着您可以通过AddMvc().AddJsonOption()

I've created my own input and outputformatters, which inherit from JsonInputFormatter to keep as much functionality the same.
In the constructor I set the supported mediatype (used some that looks like the existing one for JSON).
Also must override CreateJsonSerializer to set the ContractResolver to the desired one (could implement singleton).
Must do it this way, because changing the serializerSettings in the constructor would change the serializersettings for all input/outputformatters, meaning the default JSON formatters will also use the new contract resolver.
Also doing it this way means you can setup some default JSON options via AddMvc().AddJsonOption()

inputformatter示例，outputformatter使用相同的原理:

Example inputformatter, outputformatter uses the same principle:

static MediaTypeHeaderValue protoMediaType = MediaTypeHeaderValue.Parse("application/jsonfull");

public JsonFullInputFormatter(ILogger logger, JsonSerializerSettings serializerSettings, ArrayPool<char> charPool, ObjectPoolProvider objectPoolProvider) 
    : base(logger, serializerSettings, charPool, objectPoolProvider)
{
    this.SupportedMediaTypes.Clear();
    this.SupportedMediaTypes.Add(protoMediaType);
}

protected override JsonSerializer CreateJsonSerializer()
{
    var serializer = base.CreateJsonSerializer();            
    serializer.ContractResolver = new NoJsonPropertyNameContractResolver();

    return serializer;
}

按照设置类上方的上述URL:

As per the mentioned URL above the setup class:

public class YourMvcOptionsSetup : IConfigureOptions<MvcOptions>
{
    private readonly ILoggerFactory _loggerFactory;
    private readonly JsonSerializerSettings _jsonSerializerSettings;
    private readonly ArrayPool<char> _charPool;
    private readonly ObjectPoolProvider _objectPoolProvider;

    public YourMvcOptionsSetup(ILoggerFactory loggerFactory, IOptions<MvcJsonOptions> jsonOptions, ArrayPool<char> charPool, ObjectPoolProvider objectPoolProvider)
    {
        //Validate parameters and set fields
    }

    public void Configure(MvcOptions options)
    {
        var jsonFullInputFormatter = new JsonFullInputFormatter(
            _loggerFactory.CreateLogger<JsonFullInputFormatter>(),
            _jsonSerializerSettings,
            _charPool,
            _objectPoolProvider
        );

        options.InputFormatters.Add(jsonFullInputFormatter);

        options.OutputFormatters.Add(new JsonFullOutputFormatter(
            _jsonSerializerSettings,
            _charPool
        ));
    }

然后是注册它的扩展方法:

And then an extension method to register it:

public static class MvcBuilderExtensions
{
    public static IMvcBuilder AddJsonFullFormatters(this IMvcBuilder builder)
    {
        if (builder == null)
        {
            throw new ArgumentNullException(nameof(builder));
        }
        ServiceDescriptor descriptor = ServiceDescriptor.Transient<IConfigureOptions<MvcOptions>, YourMvcOptionsSetup>();
        builder.Services.TryAddEnumerable(descriptor);
        return builder;
    }
}

在ConfigureServices中调用它:

services.AddMvc(config =>
{
    config.RespectBrowserAcceptHeader = true; // To use the JsonFullFormatters if clients asks about it via Accept Header
})
.AddJsonFullFormatters() //Add our own JSON Formatters
.AddJsonOptions(opt =>
{
     //Set up some default options all JSON formatters must use (if any)
});

现在，我们的Xamarin应用程序可以访问webapi并接收具有通过JsonProperty属性设置的(简短)属性名称的JSON.
在网站上，我们可以通过添加Accept(获取调用)和ContentType(发布/放置调用)标头来获得完整的JSON属性名称.我们通过jQuery的$.ajaxSetup(做了一次.

Now our Xamarin App can access the webapi and receive JSON with (short) property names set via JsonProperty attribute.
And in the website we can get the full JSON property names by adding an Accept (get calls) and ContentType (post/put calls) header. Which we do once via jQuery's $.ajaxSetup(.

$.ajaxSetup({
    contentType: "application/jsonfull; charset=utf-8",
    headers: { 'Accept': 'application/jsonfull' }
});