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

发布时间：2020-12-16 06:51:59 所属栏目：asp.Net 来源：网络整理

导读：我正在尝试编写符合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JSON数组,第一个元素是字符串,以下元素是字符串数组.我可以通过返回一个字符串数组(string [] [])

我正在尝试编写符合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JSON数组,第一个元素是字符串,以下元素是字符串数组.我可以通过返回一个字符串数组(string [] [])并让WCF将其序列化为JSON来获得它.但是,为了符合规范,我试图返回一个对象数组(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.”这是我能得到的唯一错误.

我无法使用一组对象来存储一个字符串和三个数组？为了使用WCF返回符合此规范的正确JSON,我还能做些什么呢？

编辑：添加了更多的代码

解决方法

你发布了一堆[DataMember]的.请发布整个[DataContract].还向我们展示了返回DataContract时返回的JSON.

数据合同不应包含行为.尝试以下(我没有机会测试它,并且需要假装数据来执行此操作)：

[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; }
}

好吧,我已经阅读了足够的规范和JSON规范,以说服自己确实需要返回一个对象数组,而不是一个包含对象数组的类的实例.当然,这并不是很有效.这是你需要的：

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

我只是尝试过它,它起作用了.这是JSON(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",...]
]

（编辑：李大同）

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