public DataReaderValueDeserializer(DataReaderMetadata dataReaderMetadata, MethodInfo getValueMethod, Type type, int ordinal)
{
this.dataReaderMetadata = dataReaderMetadata;
this.getValueMethod = getValueMethod;
this.type = type;
this.ordinal = ordinal;
nullableInfo = NullableInfo.GetNullable(type);
}
internal static ParametersSerializer Create(Type connectionType, Type parametersType)
{
var moduleBuilder = DynamicAssembly.GetExistingDynamicAssemblyOrCreateNew(parametersType.Assembly);
var typeName = DynamicAssembly.GetUniqueTypeName("Daf.Map.Runtime." + parametersType.Name + nameof(ParametersSerializer));
var typeBuilder = moduleBuilder.DefineType(typeName, TypeAttributes.Sealed, typeof(ParametersSerializer), Type.EmptyTypes);
// Serialize().
{
var method = typeBuilder.DefineMethod(nameof(ParametersSerializer.Serialize), MethodAttributes.Public | MethodAttributes.Virtual, CallingConventions.Standard, typeof(void), new[] { typeof(DbParameterCollection), typeof(object) });
var il = method.GetILGenerator();
var locals = new LocalsMap(il);
var properties = parametersType.GetProperties();
for (var parameterIndex = 0; parameterIndex < properties.Length; parameterIndex++)
{
var propertyInfo = properties[parameterIndex];
if (propertyInfo.CanRead == false || propertyInfo.GetGetMethod() == null)
{
var backingField = parametersType.GetField("<" + propertyInfo.Name + ">k__BackingField", BindingFlags.Instance | BindingFlags.NonPublic);
if (backingField == null)
{
continue;
}
il.Emit(OpCodes.Ldarg_1);
il.Emit(OpCodes.Ldstr, '@' + propertyInfo.Name);
il.Emit(OpCodes.Ldarg_2);
il.Emit(OpCodes.Ldfld, backingField);
}
else
{
il.Emit(OpCodes.Ldarg_1);
il.Emit(OpCodes.Ldstr, '@' + propertyInfo.Name);
il.Emit(OpCodes.Ldarg_2);
il.Emit(OpCodes.Call, propertyInfo.GetGetMethod());
}
var nullableInfo = NullableInfo.GetNullable(propertyInfo.PropertyType);
if (nullableInfo != null)
{
var isNotNullLabel = il.DefineLabel();
var completeLabel = il.DefineLabel();
var index = locals.GetLocalIndex(propertyInfo.PropertyType, "nullable") ?? locals.DeclareLocal(propertyInfo.PropertyType, "nullable");
il.Emit(OpCodes.Stloc, index);
il.Emit(OpCodes.Ldloca_S, index);
il.Emit(OpCodes.Call, nullableInfo.HasValueGetProperty);
il.Emit(OpCodes.Brtrue_S, isNotNullLabel);
// Value == null
{
il.Emit(OpCodes.Ldsfld, DbNull);
il.Emit(OpCodes.Br_S, completeLabel);
}
// Value != null
{
il.MarkLabel(isNotNullLabel);
il.Emit(OpCodes.Ldloca_S, index);
il.Emit(OpCodes.Call, nullableInfo.GetValueOrDefaultMethod);
il.Emit(OpCodes.Box, nullableInfo.UnderlyingType);
}
il.MarkLabel(completeLabel);
}
else if (propertyInfo.PropertyType.IsClass)
{
var completeLabel = il.DefineLabel();
il.Emit(OpCodes.Dup);
il.Emit(OpCodes.Brtrue_S, completeLabel);
// Value == null
{
il.Emit(OpCodes.Pop);
il.Emit(OpCodes.Ldsfld, DbNull);
}
il.MarkLabel(completeLabel);
}
else
{
il.Emit(OpCodes.Box, propertyInfo.PropertyType);
}
var adoProviderMetadata = AdoProviderMetadata.GetMetadata(connectionType);
il.Emit(OpCodes.Newobj, adoProviderMetadata.ParameterConstructor);
il.Emit(OpCodes.Call, adoProviderMetadata.ParameterCollectionAddMethod);
il.Emit(OpCodes.Pop);
}
il.Emit(OpCodes.Ret);
}
return((ParametersSerializer)Activator.CreateInstance(typeBuilder.CreateTypeInfo()));
}
