public static IEnumerable <T> MapToEntities <T>(this DbDataReader reader)
{
EntityDynamicBuilder <T> builder = EntityDynamicBuilder <T> .CreateBuilder(reader);
while (reader.Read())
{
yield return(builder.Build(reader));
}
}
public static EntityDynamicBuilder <T> CreateBuilder(DbDataReader dataRecord)
{
Type typeOfObject = typeof(T);
EntityDynamicBuilder <T> dynamicBuilder = new EntityDynamicBuilder <T>();
if (_cachedMappers.ContainsKey(typeOfObject))
{
dynamicBuilder.handler = (Load)_cachedMappers[typeOfObject];
return(dynamicBuilder);
}
DynamicMethod method = new DynamicMethod("DynamicCreate", typeOfObject, new Type[] { typeof(DbDataReader) }, typeOfObject, true);
ILGenerator generator = method.GetILGenerator();
LocalBuilder result = generator.DeclareLocal(typeOfObject);
generator.Emit(OpCodes.Newobj, typeOfObject.GetConstructor(Type.EmptyTypes));
generator.Emit(OpCodes.Stloc, result);
for (int i = 0; i < dataRecord.FieldCount; i++)
{
string propName = dataRecord.GetName(i);
PropertyInfo propertyInfo = typeOfObject.GetProperty(propName);
//var propertyInfo = typeOfObject.GetProperty(ConvertLowerUnderscoreNamingToPascalNaming(dataRecord.GetName(i)));
Label endIfLabel = generator.DefineLabel();
if (propertyInfo != null && propertyInfo.GetSetMethod() != null)
{
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldc_I4, i);
generator.Emit(OpCodes.Callvirt, isDBNullMethod);
generator.Emit(OpCodes.Brtrue, endIfLabel);
generator.Emit(OpCodes.Ldloc, result);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldc_I4, i);
generator.Emit(OpCodes.Callvirt, getValueMethod);
generator.Emit(OpCodes.Unbox_Any, dataRecord.GetFieldType(i));
generator.Emit(OpCodes.Callvirt, propertyInfo.GetSetMethod());
generator.MarkLabel(endIfLabel);
}
}
generator.Emit(OpCodes.Ldloc, result);
generator.Emit(OpCodes.Ret);
var delegateMethod = method.CreateDelegate(typeof(Load));
_cachedMappers.GetOrAdd(typeOfObject, delegateMethod);
dynamicBuilder.handler = (Load)delegateMethod;
return(dynamicBuilder);
}
