XmlSerializer反序列化期间如何忽略只读属性集？

Question

I have read only property in my class

[XmlIgnore]
public string Amount
{
    get { return "Some value";  }
}

When I try deserialize object from file I don't want that deserialization goes throw exception and I don't receive object. I tried use xml ignore attribute but it is not help me. Only what I need to set properties which is exist in my file.

XML file

<?xml version="1.0" encoding="utf-8"?>
<Class xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Id>1</KaumeheId>
  <PrivaatKey>123</PrivaatKey>
</Class>

Class

public class Class
{
    public int Id { get; set; }
    public string PrivaatKey { get; set; }
    public string Amount
    {
        get { return "Some value"; }
    }
}

Serializer

public static class XmlDeserializerService<T>
{
    public static void LoadDataToClass(T obj, string filePath)
    {

        XmlSerializer serializer = new XmlSerializer(typeof(T));
        using (FileStream fileStream = new FileStream(filePath, FileMode.Open))
        {
            obj = (T) serializer.Deserialize(fileStream);
        }
    }
}

Additional info(modified):

If I look in debugger under obj.Amount I have Amount = 'obj.Amount' threw an exception of type System.NullReferenceException

Answer 1

I think the problem is in your deserialization method, i would change it to return object:

public static class XmlDeserializerService<T>
{
    public static T LoadDataToClass(string filePath)
    {    
        XmlSerializer serializer = new XmlSerializer(typeof(T));
        using (FileStream fileStream = new FileStream(filePath, FileMode.Open))
        {
            return  (T)serializer.Deserialize(fileStream);
        }
    }
}

My Class is :

public class Class
{
    public int Id { get; set; }
    public string PrivaatKey { get; set; }  
    public string Amount
    {
        get { return "Some value"; }
    }
}

If i use it after that :

var r = XmlDeserializerService<Class>.LoadDataToClass(@"yourxml");

I see all fields:

That works, if you will have a valid xml, one that you have provided has invalid Id tag. Valid one is:

<?xml version="1.0" encoding="utf-8"?>
<Class xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Id>1</Id>
  <PrivaatKey>123</PrivaatKey>
</Class>