代码之家 › 专栏 › 技术社区 › Nii Laryea

从WP8中的xml读取时出现System.InvalidOperationException

xml-deserialization xml-serialization windows-phone-8 xml c#

Nii Laryea · 技术社区 · 11 年前

这是来自的后续问题 How to create an empty xml in Windows Phone 8 .

我这样做是为了创建xml:

public void create()
    {
        List<DataModel> __dataList = new List<DataModel>();

        XmlWriterSettings xmlWriterSettings = new XmlWriterSettings();
        xmlWriterSettings.Indent = true;

        using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
        {
            using (IsolatedStorageFileStream stream = myIsolatedStorage.OpenFile("Data.xml", FileMode.Create))
            {
                XmlSerializer serializer = new XmlSerializer(typeof(List<DataModel>));
                using (XmlWriter xmlWriter = XmlWriter.Create(stream, xmlWriterSettings))
                {
                    serializer.Serialize(stream, __dataList);
                }
            }
        }
    }

当我尝试用这个代码阅读它时,我会得到另一个 System.InvalidOperationException

    public void read()
    {
        List<DataModel> __dataList = new List<DataModel>();
        try
        {
            using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
            {
                using (IsolatedStorageFileStream stream = myIsolatedStorage.OpenFile("Data.xml", FileMode.Open))
                {
                    XmlSerializer serializer = new XmlSerializer(typeof(List<DataModel>));
                    __dataList = (List<DataModel>)serializer.Deserialize(stream);
                }
            }
        }
        catch (Exception e)
        {
            string s = e.Message;
            e.ToString();
        }
    }

异常消息是“XML文档(2118)中有错误。”我的代码出了什么问题?

编辑 :内部异常为“根级别的数据无效。第2行,位置118。”

编辑2 :我使用读取xml的内容 StreamReader.ReadToEnd() 在反序列化之前,这是返回字符串: <?xml version="1.0" encoding="utf-8"?> <ArrayOfDataModel xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" />

这是我第一次使用xml,所以这个问题可能很简单,但我可能没有意识到。有什么帮助吗?

1 回复 | 直到 7 年前

Romasz Jaihind 11 年前

下面的代码是否也给出了一个错误?数据模型的构造是什么?

      public void create()
  {
     List<DataModel> __dataList = new List<DataModel>();

     //XmlWriterSettings xmlWriterSettings = new XmlWriterSettings();
     //xmlWriterSettings.Indent = true;

     using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
     {
        using (IsolatedStorageFileStream stream = myIsolatedStorage.OpenFile("Data.xml", FileMode.Create))
        {
           try
           {
              XmlSerializer serializer = new XmlSerializer(typeof(List<DataModel>));
              //using (XmlWriter xmlWriter = XmlWriter.Create(stream, xmlWriterSettings))
              //{
              serializer.Serialize(stream, __dataList);
              //}
           }
           catch { }
        }
     }
  }

  public void read()
  {
     List<DataModel> __dataList = new List<DataModel>();
     try
     {
        using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
        {
           using (IsolatedStorageFileStream stream = myIsolatedStorage.OpenFile("Data.xml", FileMode.Open))
           {
              XmlSerializer serializer = new XmlSerializer(typeof(List<DataModel>));
              __dataList = (List<DataModel>)serializer.Deserialize(stream);
           }
        }
     }
     catch (Exception e)
     {
        string s = e.Message;
        e.ToString();
     }
  }

在某个地方:

public class DataModel
{ }

上面的代码对我有效。