将 XML 中的 反序列化为 List<>

我在反序列化 WCF Web 服务的结果时遇到问题。该方法返回一个List<RecipeEntity>，它被序列化为 XML，如下所示。当我尝试反序列化时，我只是得到一个异常，如下所示。看来我无法反序列化<ArrayOfRecipe> to List<RecipeEntity>。注意RecipeEntity由合约名称映射到Recipe.

搜索后，我看到许多建议 XmlArray 和 XmlElement 属性，但据我所知，它们不适用于此处GetRecipes()方法。我只看到它们在序列化类的字段上使用。

我知道我可以把List<RecipeEntity> in a RecipeListclass 并返回它，但我宁愿对于任何给定类型直接反序列化为 List 。

例外：

System.InvalidOperationException was caught
  Message=There is an error in XML document (1, 2).
  StackTrace:
       at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, Object events)
       at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle)
       at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader)
       at GroceriesAppSL.Pages.Home.GetRecipesCallback(RestResponse response)
  InnerException: System.InvalidOperationException
       Message=<ArrayOfRecipe xmlns='Groceries.Entities'> was not expected.
       StackTrace:
            at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderList1.Read5_Recipe()
       InnerException: 

数据合约：

[DataContract(Name = "Recipe", Namespace = "Groceries.Entities")]
public class RecipeEntity
{
    [DataMember] public int Id;
    [DataMember] public string Name;
    [DataMember] public string Description;
}

执行：

[ServiceContract]
public interface IMyService
{
    [OperationContract]
    [WebGet(ResponseFormat = WebMessageFormat.Xml, UriTemplate = "Recipes/{username}")]
    List<RecipeEntity> GetRecipes(string username);
}

public class MyService : IMyService
{
    public List<RecipeEntity> GetRecipes(string username)
    {
        return _recipeDB.Recipes.Select(ToEntity).ToList();
    }
}

XML 结果示例，仅供说明之用。

<ArrayOfRecipe xmlns="Groceries.Entities" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<Recipe>
<Id>139</Id>
<Name>ExampleRecipe</Name>
<Description>5 L milk;4 eggs</Description>
</Recipe>
<Recipe>...</Recipe>
<Recipe>...</Recipe>
<Recipe>...</Recipe>
...
</ArrayOfRecipe>

反序列化代码：

using (var xmlReader = XmlReader.Create(new StringReader(response.Content)))
{
    var xs = new System.Xml.Serialization.XmlSerializer(typeof(List<RecipeEntity>));
    var recipes = (List<RecipeEntity>)xs.Deserialize(xmlReader);
}

您正在使用DataContractSerializer序列化和XmlSerializer反序列化。这两个不使用相同的方法。您必须使用DataContractSerializer在您的反序列化方法中，或者您必须将您的操作或服务标记为XmlSerializerFormat属性（在这种情况下，WCF 将使用XmlSerializer代替DataContractSerializer). DataContract and DataMember属性仅用于DataContractSerializer. XmlSerializer使用它自己定义的属性System.Xml.Serialization命名空间。