Intermittent errors while de-serializing object from XML

Question

I have a program that takes objects stored as XML in a database (basicly a message queue) and de-serializes them. Intermittently, I will get one of the following errors:

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Answer 1

This is a sign that you are not caching your serialisers which is not good at all => it leads to memory leak and I suspect you will experience this.

Remember that .NET generates code and compiles them into assemblies every time you create a serialiser.

Always create your serialisers and then cache them.

Here is a sample:

public class SerialiserCache
{

    private static readonly SerialiserCache _current = new SerialiserCache();
    private Dictionary _cache = new Dictionary();

    private SerialiserCache()
    {

    }

    public static SerialiserCache Current
    {
        get { return _current; }
    }

    public XmlSerializer this[Type t]
    {
        get
        {
            LoadIfNecessary(t);
            return _cache[t];
        }
    }

    private void LoadIfNecessary(Type t)
    {

        // double if to prevent race conditions 
        if (!_cache.ContainsKey(t))
        {
            lock (_cache)
            {
                if (!_cache.ContainsKey(t))
                {
                    _cache[t] = new XmlSerializer(typeof(T));
                }
            }
        }
    }

}