Question

我正在尝试解析以下json： http://libris.kb.se/xsearch?query=%22design%22+language:%28%22ENG%22%29&format=json&format_level=full&database=swepub 正如您在list元素的第一项中所看到的，描述是一个常规字符串。对于其他8个结果也是如此，但是在第9个结果中，由于某种原因，它变成了一个字符串数组。

我正在使用C＃和DataContract尝试解析它，但它显然不起作用，因为结果之间的类型不同。我该如何解决这个问题？我想可以手动解析所有内容，但我宁愿不这样做。

这是我的DataContract的

[DataContract]
public class SwepubHeader
{
    [DataMember(Name = "xsearch")]
    public SwepubBody Body { get; set; }
}

[DataContract]
public class SwepubBody
{
    [DataMember(Name = "from")]
    public int From { get; set; }

    [DataMember(Name = "to")]
    public int To { get; set; }

    [DataMember(Name = "records")]
    public int Records { get; set; }

    [DataMember(Name = "list")]
    public SwepubSearchItem[] SearchItems { get; set; }
}

[DataContract]
public class SwepubSearchItem
{
    [DataMember(Name = "isbn")]
    public string ISBN { get; set; }

    [DataMember(Name = "title")]
    public string Title { get; set; }

    [DataMember(Name = "description")]
    public string Description { get; set; }

    [DataMember(Name = "identifier")]
    public string Identifier { get; set; }

    [DataMember(Name = "type")]
    public string Type { get; set; }

    [DataMember(Name = "publisher")]
    public string Publisher { get; set; }

    [DataMember(Name = "date")]
    public string Date { get; set; }

    [DataMember(Name = "language")]
    public string Language { get; set; }

    [DataMember(Name = "relation")]
    public string Relation { get; set; }

    [DataMember(Name = "subject")]
    public string[] Subjects { get; set; }

    [DataMember(Name = "creator")]
    public string[] Creators { get; set; }
}

这就是我解析它的方式

                    using (var response = request.GetResponse() as HttpWebResponse)
                {
                    if (response != null)
                    {
                        if (response.StatusCode != HttpStatusCode.OK)
                            throw new Exception(String.Format(
                                "Server error (HTTP {0}: {1}).",
                                response.StatusCode,
                                response.StatusDescription));
                        var jsonSerializer = new DataContractJsonSerializer(typeof(SwepubHeader));
                        object objResponse = jsonSerializer.ReadObject(response.GetResponseStream());
                        var jsonResponse = objResponse as SwepubHeader;
                        return jsonResponse;
                    }
                }

Answer 1

url返回两个不同的JSON对象。这真的不是一个很好的设计，但是如果你无法控制它，那么一个选择是尝试用字符串数据反序列化它，如果失败则用一个字符串数组反序列化它。

编辑：为了使这项工作变得轻松，您应该对对象进行反序列化。但它不是一个字符串数组...它是一个字符串或一个对象数组...所以下面的代码将处理这个......用以下代码替换你的Description属性...

[DataMember(Name = "description")]
public object description { get; set; }

public string Description {
    get
    {
        var seperator = string.Empty; // replace with what you want
        var s = description as string;
        if (s != null)
            return s;
        var sArray = description as object[];
        if (sArray != null)
            return String.Join(seperator, sArray);
        return null;
    }
    set
    {
        description = value;
    }
}

Answer 2

这对于他们的JSON格式来说真的不是一个很好的设计，但你可以通过将描述作为一个对象来处理它。然后，您如何处理该对象取决于您，但您可以创建另一个属性，将其转换为您需要的属性：

[DataMember(Name = "description"]
private object _description;

public string Description
{
    get
    {
        if (_description != null)
        {
            if (_description is string)
            {
                // Do Nothing
                // You can remove this, just putting this here to 
                //   show conditional is implicit
            }
            else if (_description is string[])
            {
                // Join string[] using '\n\n' as the connector
                _description = string.Join("\n\n", (string[])_description);
            }
        }

        return _description as string;
    }
}

解析有时是数组的json字符串

2 个答案: