private static Func <InternalEntityEntry, TProperty> CreateCurrentValueGetter <TProperty>(IPropertyBase propertyBase)
{
var entityClrType = propertyBase.DeclaringEntityType.ClrType;
var entryParameter = Expression.Parameter(typeof(InternalEntityEntry), "entry");
var shadowIndex = (propertyBase as IProperty)?.GetShadowIndex() ?? -1;
Expression currentValueExpression;
if (shadowIndex >= 0)
{
currentValueExpression = Expression.Call(
entryParameter,
InternalEntityEntry.ReadShadowValueMethod.MakeGenericMethod(typeof(TProperty)),
Expression.Constant(shadowIndex));
}
else
{
currentValueExpression = Expression.Property(
Expression.Convert(
Expression.Property(entryParameter, "Entity"),
entityClrType),
propertyBase.GetPropertyInfo());
}
var storeGeneratedIndex = propertyBase.GetStoreGeneratedIndex();
if (storeGeneratedIndex >= 0)
{
currentValueExpression = Expression.Call(
entryParameter,
InternalEntityEntry.ReadStoreGeneratedValueMethod.MakeGenericMethod(typeof(TProperty)),
currentValueExpression,
Expression.Constant(storeGeneratedIndex));
}
return(Expression.Lambda <Func <InternalEntityEntry, TProperty> >(
currentValueExpression,
entryParameter)
.Compile());
}
