asp.net - 在 WCF 中将对象数组序列化为 JSON 以符合 OpenSearch

Question

我正在尝试编写一个符合 OpenSearch 规范的 OpenSearch 建议服务。

http://www.opensearch.org/Specifications/OpenSearch/Extensions/Suggestions

此规范要求服务返回一个 JSON 数组，其中第一个元素是字符串，后面的元素是字符串数组。通过返回一个字符串数组 (string[][]) 并让 WCF 将其序列化为 JSON，我几乎可以得到它。但是，为了符合规范，我尝试返回一个对象数组(object[])，第一个是字符串，其余的是字符串数组(string[])。

每当我尝试返回对象数组时，它都不起作用，例如:

来自服务:

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class SuggestionService : ISuggestionService
{
    public object[] Search(string searchTerms)
    {
        SearchSuggestions = new object[4];
        SearchText = searchTerms;
        SearchSuggestions[0] = SearchText;
        Text = new string[10];
        Urls = new string[10];
        Descriptions = new string[10];

        // Removed irrelevant ADO.NET code
        while (searchResultReader.Read() && index < 10)
        {

            Text[index] = searchResultReader["Company"].ToString();
            Descriptions[index] = searchResultReader["Company"].ToString();
            Urls[index] = "http://dev.localhost/Customers/EditCustomer.aspx?id=" +
                          searchResultReader["idCustomer"];
            index++;
        }

        SearchSuggestions[1] = Text;
        SearchSuggestions[2] = Descriptions;
        SearchSuggestions[3] = Urls;
        return SearchSuggestions;
    }

    [DataMember]
    public string SearchText { get; set; }

    [DataMember]
    public string[] Text { get; set; }

    [DataMember]
    public string[] Descriptions { get; set; }

    [DataMember]
    public string[] Urls { get; set; }

    [DataMember]
    public object[] SearchSuggestions { get; set; }
}

这是整个界面:

[ServiceContract]
public interface ISuggestionService
{
    [OperationContract]
    [WebGet(UriTemplate = "/Search?q={searchTerms}",
        BodyStyle = WebMessageBodyStyle.Bare,
        ResponseFormat = WebMessageFormat.Json)]
    object[] Search(string searchTerms);
}

这会导致服务返回“错误 324 (net::ERR_EMPTY_RESPONSE):未知错误。”这是我遇到的唯一错误。

我无法使用对象数组来存储一个字符串和三个数组吗？为了使用 WCF 返回符合此规范的正确 JSON，我还能做什么？

编辑:添加了更多代码

Answer 1

您发布了一堆 [DataMember]。请发布完整的[数据契约(Contract)]。还向我们展示您返回 DataContract 时返回的 JSON。

<小时/>

数据契约(Contract)不应包含行为。尝试以下操作(我还没有机会测试它，并且需要伪造数据才能做到这一点):

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class SuggestionService : ISuggestionService
{
    public SearchResults Search(string searchTerms)
    {
        var results = new SearchResults
                          {
                              SearchText = searchTerms,
                              Text = new string[10],
                              Urls = new string[10],
                              Descriptions = new string[10]
                          };

        // Removed irrelevant ADO.NET code
        int index = 0;
        while (searchResultReader.Read() && index < 10)
        {

            results.Text[index] = searchResultReader["Company"].ToString();
            results.Descriptions[index] = searchResultReader["Company"].ToString();
            results.Urls[index] = "http://dev.localhost/Customers/EditCustomer.aspx?id=" +
                          searchResultReader["idCustomer"];
            index++;
        }

        return results;
    }
}

[DataContract]
public class SearchResults
{
    [DataMember]
    public string SearchText { get; set; }

    [DataMember]
    public string[] Text { get; set; }

    [DataMember]
    public string[] Descriptions { get; set; }

    [DataMember]
    public string[] Urls { get; set; }
}

<小时/>

好吧，我已经阅读了足够多的规范和 JSON 规范，以说服自己您确实需要返回一个对象数组，而不是包含对象数组的类的实例。当然，这并不完全有效。这是您需要的:

[ServiceContract]
[ServiceKnownType(typeof(string))]
[ServiceKnownType(typeof(string[]))]
public interface ISuggestionService
{
    [OperationContract]
    [WebGet(UriTemplate = "/Search?q={searchTerms}",
        BodyStyle = WebMessageBodyStyle.Bare,
        ResponseFormat = WebMessageFormat.Json)]
    object[] Search(string searchTerms);
}

我刚刚尝试了一下，成功了。这是 JSON(已添加缩进):

[
    "abc",
    ["Company1","Company2","Company3",...],
    ["Company1 Description","Company2 Description","Company3 Description",...],
    ["http:\/\/dev.localhost\/Customers\/EditCustomer.aspx?id=1",
     "http:\/\/dev.localhost\/Customers\/EditCustomer.aspx?id=2",
     "http:\/\/dev.localhost\/Customers\/EditCustomer.aspx?id=3",...]
]