public void ConstructFieldOrPropertyGetterFixture()
{
var func = ReflectionExtensions.ConstructFieldOrPropertyGetter <ObjectWithProperties, int>("Property1");
func(new ObjectWithProperties()).Should().Equal(1);
var delegate1 = ReflectionExtensions.ConstructFieldOrPropertyGetter(typeof(ObjectWithProperties), "Property1");
delegate1.DynamicInvoke(new ObjectWithProperties()).Should().Equal(1);
}
//public static Expression GetForeinKeyValue<T, TProperty>(Expression<Func<T, TProperty>> property)
//{
// var type = typeof(T);
// var keyName = type.GetRuntimeProperty(typeof(TProperty).Name).GetCustomAttribute<ForeignKeyAttribute>().Name;
// MemberExpression getter = ReflectionExtensions.ConstructFieldOrPropertyGetter(Expression.Parameter(type), keyName);
// return null;
//}
public static Expression <Func <T, TProperty, bool> > GetForeinKeyPredicate <T, TProperty>(Expression <Func <T, TProperty> > path, out Action <T, TProperty> setter)
{
var type = typeof(T);
var typeProperty = typeof(TProperty);
var foreignKeyEntityMember = ((MemberExpression)path.Body).Member;
var keyName = foreignKeyEntityMember.CustomAttributes.First(attrData => attrData.AttributeType == typeof(ForeignKeyAttribute)).ConstructorArguments[0].Value.ToString();
var baseEntityParameter = Expression.Parameter(type, "TBaseEntity");
var foreignEntityParameter = Expression.Parameter(typeProperty, "TForeignEntity");
MemberExpression foreignKeyGetter = ReflectionExtensions.ConstructFieldOrPropertyGetter(baseEntityParameter, keyName);
MemberExpression primaryKeyGetter = ReflectionExtensions.ConstructFieldOrPropertyGetter(foreignEntityParameter, keyName);
var binary = Expression.Equal(foreignKeyGetter, primaryKeyGetter);
setter = ReflectionExtensions.ConstructFieldOrPropertySetter <T, TProperty>(foreignKeyEntityMember.Name);
return(Expression.Lambda <Func <T, TProperty, bool> >(binary, baseEntityParameter, foreignEntityParameter));
}
/// <summary>
/// Construct forreign key setter action
/// </summary>
/// <typeparam name="TObj">Type of entity</typeparam>
/// <param name="complexProperty">Navigate object property</param>
/// <param name="simpleProperty">Foreign key property</param>
/// <returns>setter</returns>
public static Action <TObj> ConstructForeignKeyTrigger <TObj>(string complexProperty, string simpleProperty) where TObj : class
{
ParameterExpression obj = Expression.Parameter(typeof(TObj), "Tobj");
var complexMember = ReflectionExtensions.ConstructFieldOrPropertyGetter(obj, string.Concat(complexProperty, ".", simpleProperty));
var complexMemberParent = ReflectionExtensions.ConstructFieldOrPropertyGetter(obj, complexProperty);
var simpleMember = ReflectionExtensions.ConstructFieldOrPropertyGetter(obj, simpleProperty);
var res = Expression.IfThenElse(Expression.NotEqual(complexMemberParent, Expression.Constant(null)), //if
Expression.Assign(simpleMember, complexMember), //then
Expression.Block( //else
Expression.Assign(complexMemberParent, Expression.New(complexMemberParent.Type)),
Expression.Assign(complexMember, simpleMember)
));
var setter = Expression.Lambda <Action <TObj> >(res, obj);
return(setter.Compile());
}
