error generating xml document in C#

Question

I'm trying to so some serialization using C#, but it throws an exception saying that there was an error generating the xml document. This is where I do the serialization:

 public void serialize()
    {
        try
        {
            XmlSerializer ser = new XmlSerializer(typeof(Repository<Student>));
            StreamWriter myWriter = new StreamWriter("stud.xml");
            ser.Serialize(myWriter, rep);
            myWriter.Close();
        }
        catch (Exception e)
        {
            Console.WriteLine("Error " + e.Message);
        }     

    }

And this is the class I want to serialize:

 public class Repository<T> : MyStack<T>
{
    public int size;
    public int capacity;
    public SLL<T> stud;

    public Repository()
    {
        /*
         * Creator for class Repository.
         */
        this.stud = new SLL<T>();
        this.capacity = 20;
        this.size = 0;
    }

where MyStack is an interface, and SSL<T> is singly-linked list I have implemented.

What's the actual exception? Is an InnerException provided?

xspydr
– xspydr

2014-01-11 13:58:39 +00:00
Commented Jan 11, 2014 at 13:58 — xspydr
– xspydr, Commented Jan 11, 2014 at 13:58

Cosmin Vană · Accepted Answer · 2014-01-11 13:58:53Z

2

Please add the full details of your exception to isolate the problem. From the code that you posted, it looks like your classes are not serializable.

Are the Repository, MyStack, SSL serializable classes (do you have the [Serializable] attribute on all the types of the members that will be serialized?)

answered Jan 11, 2014 at 13:58

Cosmin Vană

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2 Comments

user1796659 Over a year ago

System.TypeAccessException: Attempt by method 'Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterRepository1.Write4_RepositoryOfStudent(System.Object)' to access type 'NS.stackRepository.Repository'1<NS.student.Student>' failed.

Cosmin Vană Over a year ago

Check your student class access modifier. Is it internal ? It should be public for the serializer to access it.

Jason Evans · Accepted Answer · 2014-01-11 14:02:38Z

2

It looks odd to serialise the repository class. Instead I would serialise the SLL<T> object, since that is the actual data you are interested in. The repository is just wrapper object for getting to data, thus there's no reason to serialise that.

As Cosmin mentions, make sure you place a [Serializable] attribute on SLL<>

[Serializable]
public class SLL<T>
{
}

answered Jan 11, 2014 at 14:02

Jason Evans

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1 Comment

Jason Evans Over a year ago

Can you let us know why it didn't work? Was there an error? Also can you post the entire code for SLL<> otherwise it's very difficult to help out.

wondra · Accepted Answer · 2014-01-11 14:08:37Z

Here is an example how to serialize. i think you might miss some important parts:

[Serializable]
public class User
{
    [XmlElement("login")]
    [Key]
    public string login { get; set; }

    [XmlElement("KDP")]
    public int KDP { get; set; }

    [XmlElement("attended")]
    public int attended { get; set; }
   etc.

the public getters and setters are important if you ever plan to deserialize. and here is example how to serialize list of these:

    [XmlArrayItem(typeof(User))]
    [XmlElement("usersList")]
    public static List<User> usersList = new List<User>();

        using (StreamWriter myWriter = new StreamWriter(usersPath, false))
        {
            userSerializer.Serialize(myWriter, usersList);
            myWriter.Close();
        }

hope it helps.

Jnyanendra Sethi · Accepted Answer · 2018-06-19 15:05:52Z

1

Use [XmlIgnore] attribute for the property which is causing error generating the xml document, so that other things can be parsed.

answered Jun 19, 2018 at 15:05

Jnyanendra Sethi

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Comments

Jeremy Caney · Accepted Answer · 2024-06-02 00:51:35Z

0

Generating Word with this error means it doesn’t have access to INSERT. Go to regedit:

HKEY_LOCAL_MACHINE\Software\Microsoft\Cryptography\Protect\Providers\df9d8cd0-1501-11d1-8c7a-00c04fc297eb

Make Dword32 key and rename it to ProtectionPolicy and set its value to 1.

edited Jun 2, 2024 at 0:51

Jeremy Caney

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answered Jun 1, 2024 at 8:24

Masoud Tavari

1

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