Question

我有一个XML字符串，它可以从API调用中检索为xml字符串。我需要在应用程序中将其转换为视图模型，以便可以在视图中显示它。但是，由于viewmodel仅具有很少的节点/元素，因为xml文档中有该节点/元素，所以当我尝试对其进行反序列化时会抛出异常。下面是代码和错误。

API端点返回此

<response>
  <data>
    <categories>
      <category>
        <id>1</id>
        <name>hats</name>
      </category>
    </categories>
  </data>
</response>

代码：

namespace CatApp.Models
{
[XmlRoot("Categories")]
public class CategoriesViewModel
{
    public CategoriesViewModel()
    {
        _categories = new List<Category>();
    }


    private  List<Category> _categories;
    [XmlElement("Category")]
    public List<Category> Categories
    {
        get { return _categories; }
        set { value = _categories; }
    }

    public class Category
    {
        [XmlElement("Id")]
        public int Id { get; set; }

        [XmlElement("Name")]
        public string Name { get; set; }
    }

  }
}


  public static async Task<CategoriesViewModel> GetAllCategories()
  {
        var model = new CategoriesViewModel();
        try
        {
            var response = await client.GetStreamAsync(uri);
            model = DeserializeXMLToObject<CategoriesViewModel>(response);


        }
        catch (Exception ex)
        {
            var exception = ex;
        }
        return model;
    }

   public static T DeserializeXMLToObject<T>(Stream stream)
   {
        T returnObject = default(T);
        try
        {
                XmlSerializer serializer = new XmlSerializer(typeof(T));

                returnObject = (T)serializer.Deserialize(stream);
        }
        catch (Exception ex)
         {

        }
        return returnObject;
    }

错误于   System.Xml.Serialization.XmlSerializer.Deserialize（XmlReader   xmlReader，字符串encodingStyle，XmlDeserializationEvents事件）
  在System.Xml.Serialization.XmlSerializer.Deserialize（Stream stream）
  在CatApp.Controllers.HomeController.DeserializeXMLToObject [T]（Stream   流中）   C：\ Users \ umerh \ source \ repos \ CatAPI \ CatApp \ Controllers \ HomeController.cs：line   50

Answer 1

首先，C＃属性中的元素名称必须与XML中的元素名称匹配。区分大小写：Categories不等于categories，依此类推。

[XmlRoot("categories")] // <--
public class CategoriesViewModel
{
    public CategoriesViewModel()
    {
        _categories = new List<Category>();
    }

    private List<Category> _categories;

    [XmlElement("category")] // <--
    public List<Category> Categories
    {
        get { return _categories; }
        set { value = _categories; }
    }

    public class Category
    {
        [XmlElement("id")] // <--
        public int Id { get; set; }

        [XmlElement("name")] // <--
        public string Name { get; set; }
    }
}

第二，您可以跳过一些xml元素，如下所示：

public static T DeserializeXMLToObject<T>(Stream stream)
{
    T returnObject = default(T);
    try
    {
        XmlSerializer serializer = new XmlSerializer(typeof(T));

        using (var xmlReader = XmlReader.Create(stream))
        {
            xmlReader.ReadToFollowing("categories"); // Skip elements before categories node
            returnObject = (T)serializer.Deserialize(xmlReader);
        }
    }
    catch (Exception ex)
    {

    }
    return returnObject;
}

反序列化具有更多节点然后类型的字符串，该类型将在c＃

1 个答案: