private Func <XmlGridRowReader, object> GetDeserializer(
XmlGridRowReader reader)
{
reader.ReadRow();
if (!reader.Columns.Any())
{
throw new InvalidOperationException("No columns");
}
var key = new DeserializerKey(reader.Columns);
if (!deserializers.TryGetValue(key, out var deserializer))
{
lock (deserializers)
{
if (!deserializers.TryGetValue(key, out deserializer))
{
deserializer = CreateDeserializer(type, reader.Columns);
deserializers.Add(key, deserializer);
}
}
}
return(deserializer);
}
public static IEnumerable <T> Read <T>(string xml)
{
if (xml is null)
{
throw new ArgumentNullException(nameof(xml));
}
using (var reader = new XmlGridRowReader(xml))
{
var result = new List <T>();
if (!reader.MoveToGrid())
{
return(result);
}
var deserializer = GetDeserializer(typeof(T), reader);
// Assumes XML is well formed
// Reader will already be positioned on a row, so excute
// a deserialize at least once
do
{
var obj = deserializer(reader);
result.Add((T)obj);
} while (reader.ReadRow());
return(result);
}
}
public static Func <XmlGridRowReader, object> GetDeserializer(
Type type, XmlGridRowReader reader)
{
if (!byType.TryGetValue(type, out var deserializers))
{
lock (byType)
{
if (!byType.TryGetValue(type, out deserializers))
{
deserializers = new TypeDeserializerCache(type);
}
byType.Add(type, deserializers);
}
}
return(deserializers.GetDeserializer(reader));
}
private static Func <XmlGridRowReader, object> GetDeserializer(
Type type, XmlGridRowReader reader)
{
return(TypeDeserializerCache.GetDeserializer(type, reader));
}
