使用 CollectionDataContract 时 DataContractSerializer 为所有值返回 null

Question

我这里引用了一些数据http://docs.microsofttranslator.com/text-translate.html#!/default/post_TranslateArray

<ArrayOfTranslateArrayResponse 
    xmlns="http://schemas.datacontract.org/2004/07/Microsoft.MT.Web.Service.V2" 
    xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
    <TranslateArrayResponse>
        <From>en</From>
        <OriginalTextSentenceLengths 
            xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
            <a:int>14</a:int>
        </OriginalTextSentenceLengths>
        <TranslatedText>Esto es una prueba</TranslatedText>
        <TranslatedTextSentenceLengths 
            xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
            <a:int>18</a:int>
        </TranslatedTextSentenceLengths>
    </TranslateArrayResponse>
    <TranslateArrayResponse>
        <From>en</From>
        <OriginalTextSentenceLengths 
            xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
            <a:int>22</a:int>
        </OriginalTextSentenceLengths>
        <TranslatedText>Hola, yo tengo una manzana</TranslatedText>
        <TranslatedTextSentenceLengths 
            xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
            <a:int>26</a:int>
        </TranslatedTextSentenceLengths>
    </TranslateArrayResponse>
</ArrayOfTranslateArrayResponse>

我正在尝试使用 DataContractSerializer 反序列化此数据。集合中的所有值均为空。我可以使用相同的结构进行序列化，结果与本文相同，但不会反序列化。这是代码。

void Main()
{
    var xmlString = "<ArrayOfTranslateArrayResponse xmlns=\"http://schemas.datacontract.org/2004/07/Microsoft.MT.Web.Service.V2\" xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\"><TranslateArrayResponse><From>language-code</From><OriginalTextSentenceLengths xmlns:a=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\"><a:int>int-value</a:int></OriginalTextSentenceLengths><State/><TranslatedText>string-value</TranslatedText><TranslatedTextSentenceLengths xmlns:a=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\"><a:int>int-value</a:int></TranslatedTextSentenceLengths></TranslateArrayResponse></ArrayOfTranslateArrayResponse>";
    var dcs = new DataContractSerializer(typeof(TranslateArrayResponseCollection));

    using (var stream = new MemoryStream())
    using (var writer = new StreamWriter(stream))
    {
        writer.Write(xmlString);
        writer.Flush();
        stream.Position = 0;

        dcs.ReadObject(stream).Dump();
    }
}

[CollectionDataContract(Name = "ArrayOfTranslateArrayResponse", Namespace = "http://schemas.datacontract.org/2004/07/Microsoft.MT.Web.Service.V2")]
public class TranslateArrayResponseCollection : List<TranslateArrayResponse> { }

[DataContract(Name = "TranslateArrayResponse", Namespace = "")]
public class TranslateArrayResponse
{
    [DataMember]
    public string Error { get; set; }

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

    [DataMember]
    public int[] OriginalSentenceLengths { get; set; }

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

    [DataMember]
    public int[] TranslatedSentenceLengths { get; set; }

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

Answer 1

在您的 XML 数据数组中命名为 OriginalTextSentenceLengths 和 TranslatedTextSentenceLengths。但在您的数据合同中，它们是OriginalSentenceLengths 和TranslatedSentenceLengths。您应该在数据合同中重命名它们：

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

[DataMember]
public int[] TranslatedTextSentenceLengths { get; set; }

另一个问题是缺少元素的命名空间。在我向所有元素添加空命名空间xmlns="" 后，数据被正确反序列化。这是修改后的 XML：

<ArrayOfTranslateArrayResponse 
    xmlns="http://schemas.datacontract.org/2004/07/Microsoft.MT.Web.Service.V2" 
    xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
    <TranslateArrayResponse>
        <From xmlns="">en</From>
        <OriginalTextSentenceLengths xmlns=""
            xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
            <a:int>14</a:int>
        </OriginalTextSentenceLengths>
        <TranslatedText xmlns="">Esto es una prueba</TranslatedText>
        <TranslatedTextSentenceLengths xmlns=""
            xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
            <a:int>18</a:int>
        </TranslatedTextSentenceLengths>
    </TranslateArrayResponse>
    <TranslateArrayResponse>
        <From xmlns="">en</From>
        <OriginalTextSentenceLengths xmlns=""
            xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
            <a:int>22</a:int>
        </OriginalTextSentenceLengths>
        <TranslatedText xmlns="">Hola, yo tengo una manzana</TranslatedText>
        <TranslatedTextSentenceLengths xmlns=""
            xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
            <a:int>26</a:int>
        </TranslatedTextSentenceLengths>
    </TranslateArrayResponse>
</ArrayOfTranslateArrayResponse>

我认为这是DataContractSerializer 的限制。检查此question 与完全相同的问题。您应该通过添加命名空间来修改源 XML，或者使用应该处理这种情况的 XmlSerializer。