public static string Stringify(Expression node)
{
var printer = new SimpleExpressionPrinter();
printer.Visit(node);
return(printer._sb.ToString().Trim());
}
public void Should_Remove_Null_Propgation_In_MethodCall_Expressions()
{
List <Product> productList = new List <Product>()
{
new Product()
{
Name = "Product 1"
},
new Product()
{
Name = null
}
};
var productsQueryable = productList.AsQueryable();
var withPropagation = (from p in productsQueryable
where (p.Name == null ? "product 1" : p.Name.ToLower()) == "product 1"
select p).Expression;
var withoutPropagation = (from p in productsQueryable
where p.Name.ToLower() == "product 1"
select p).Expression;
var propagationRemoved = new MethodCallNullPropagationYanker().Visit(withPropagation);
string withPropagationString = SimpleExpressionPrinter.Stringify(withPropagation);
string withoutPropagationString = SimpleExpressionPrinter.Stringify(withoutPropagation);
string propagationRemovedString = SimpleExpressionPrinter.Stringify(propagationRemoved);
Assert.NotEqual(withPropagationString, propagationRemovedString);
Assert.Equal(withoutPropagationString, propagationRemovedString);
}
public void Should_Remove_Null_Propgation_In_MethodCall_Expressions()
{
var storeList = new List <Store>
{
new Store {
Name = "Store 1"
},
};
var productList = new List <Product>()
{
new Product {
Name = "Product 1", Stores = storeList
},
};
var productsQueryable = productList.AsQueryable();
var withPropagation = (from p in productsQueryable
where (p.Stores == null ? Enumerable.Empty <Store>() : p.Stores).Any(x => x.Name == "Store 1")
select p).Expression;
var withoutPropagation = (from p in productsQueryable
where (p.Stores.Any(x => x.Name == "Store 1"))
select p).Expression;
var propagationRemoved = new EnumerableNullPropagationYanker().Visit(withPropagation);
string withPropagationString = SimpleExpressionPrinter.Stringify(withPropagation);
string withoutPropagationString = SimpleExpressionPrinter.Stringify(withoutPropagation);
string propagationRemovedString = SimpleExpressionPrinter.Stringify(propagationRemoved);
Assert.NotEqual(withPropagationString, propagationRemovedString);
Assert.Equal(withoutPropagationString, propagationRemovedString);
}
