简单序列化 ODataQueryOptions

Question

我正在努力：

    [EnableQuery]
    [HttpGet]
    [ODataRoute("")]
    public IHttpActionResult Get(ODataQueryOptions<UserODataModel> options)
    {
        var users = _repository.RetrieveOData();
       
        var serialQuery = JsonConvert.SerializeObject(options, jsonOptions);
        
        //save serialQuery somewhere

        return Ok(users);
    }

但是得到了

Newtonsoft.Json.JsonSerializationException: 'Error getting value from 'ReadTimeout' on 'Microsoft.Owin.Host.SystemWeb.CallStreams.InputStream'.'

"Timeouts are not supported on this stream."

我知道已经有一个关于序列化流的问题：

Newtonsoft Json.net - how to serialize content of a stream?

但在这种情况下，我不能从 ODataQueryOptions 中“提取流值”，或者我可以吗？

有点想法？

Answer 1

由于我们在同一家公司工作，如果有人感兴趣，我们找到了一种方法（可能不是很好的方法）来序列化 ODataQueryOptions：

    public static ODataQueryOptions DeserializeQueryOptions(SerializedQueryOptions options)
    {
        var uri = new Uri(teste.OriginalUri);
        var model = ODataConfig.Model; //GetEdmModel
        var segment = model.EntityContainer.FindEntitySet(options.EdmType);
        var newPath = new Microsoft.AspNet.OData.Routing.ODataPath(new EntitySetSegment(segment));

        var httpConfiguration = new HttpConfiguration();
        httpConfiguration.EnableDependencyInjection();
        var request = new HttpRequestMessage(HttpMethod.Get, uri)
        {
            Properties =
            {
                { HttpPropertyKeys.HttpConfigurationKey, httpConfiguration },
            }
        };

        var context = new ODataQueryContext(model, options.EntityType, newPath);
        var oDataQueryOptions = new ODataQueryOptions(context, request);

        return oDataQueryOptions;
    }

    public static SerializedQueryOptions SerializeQueryOptions(ODataQueryOptions options)
    {
        return new SerializedQueryOptions
        {
            OriginalUri = options.Request.RequestUri.AbsoluteUri,
            EdmType = options.Context.NavigationSource.Name,
            EntityType = options.Context.ElementClrType
        };
    }

将其序列化为对象后，您可以将其序列化为 JSON 字符串：

    var queryOptionsSerialized = new SerializedQueryOptions()
    {
        OriginalUri = "http://localhost:25723/odata/users?$skip=0&$top=2&$orderby=fullName&$count=true",
        EdmType = "users",
        EntityType = typeof(UserODataModel)
    };

    var json = JsonConvert.SerializeObject(queryOptionsSerialized);
    var deserialized = JsonConvert.DeserializeObject<SerializedQueryOptions>(json);

    var options = ODataQueryOptionsHelper.DeserializeQueryOptions(deserialized);

Answer 2

万一不使用 OData 路由或使用 ApiController（不是 ODataController），修改获取ODataPath的方式为：

ODataUriParser parser = new ODataUriParser(model, serviceRoot, requestUri);
ODataPath path = parser.ParsePath();
//var newPath = new Microsoft.AspNet.OData.Routing.ODataPath(new EntitySetSegment(segment));
Microsoft.AspNet.OData.Routing.ODataPath newPath = new Microsoft.AspNet.OData.Routing.ODataPath(path.FirstOrDefault());

其中 serviceRoot 是模型中定义的路径之外的 Url 部分。

简单序列化 ODataQueryOptions

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