I´m in the works for the version 2.0 of the library and one of the milestones is to improve a bit the performance (mostly the use of reflection and string handling)
Now I´m trying to use the cool DynamicMethods of .NET 2.0 and I´m surprised how easy and fast them are !!
I just finish to implement the setters via a Dynamic Method using the CreateDelegate and I get a 25% of improved performance over the past versions !!!! (in files with more than 500 or 1000 records)
Here is the code that I´m using:
For example in the FieldBase I was using the FieldInfo.SetValue but now I create a new method at run time
(Suppose that the RecordClass is SampleType and the field Field1 of DateTime)
static void SetField1(object record, object val) {
((SampleType)record).Field1 = (DateTime)val;
}
I need so a Delegate for these methods calls (all private to the FieldBase class)
delegate void SetValueDelegate(object record, object value);
SetValueDelegate mSetDelegate;
finally playing a bit with Reflector we need to add to the constructor we need these lines:
protected FieldBase(FieldInfo fi)
{
DynamicMethod dm = new DynamicMethod("__SetFH__" + fi.Name, typeof(void),
new Type[] { typeof(object), typeof(object) }, fi.DeclaringType, true);
ILGenerator il = dm.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Castclass, fi.DeclaringType);
il.Emit(OpCodes.Ldarg_1);
if (fi.FieldType.IsValueType)
il.Emit(OpCodes.Unbox_Any, fi.FieldType);
else
il.Emit(OpCodes.Castclass, fi.FieldType);
il.Emit(OpCodes.Stfld, fi);
il.Emit(OpCodes.Ret);
mSetDelegate = (SetValueDelegate)dm.CreateDelegate(typeof(SetValueDelegate));
And at last instead of using the slow:
mFieldInfo
.SetValue(record, val);
We use :
mSetDelegate(record, val);
I will post the benchmarks when I finish the tweaks.
See ya
