Challenge #1 - Solution 1 - Contains Query Manual

ProductsController.cs

var parameter = Expression.Parameter(typeof(Product), "x");
var property = Expression.Property(parameter, "Name")

// Find single parameter 'Contains' method of string with reflection:
var method = typeof(string).GetMethod(nameof(string.Contains), types: new[] { typeof(string) });
var comparison = Expression.Call(
                              method: method,
                              instance: property
                              arguments: new []{ Expression.Constant(filter.Name) });
var lambda = Expression.Lambda<Func<Product, bool>>(comparison, parameter);
var query = db.Products.Where(comparison);