public void Grouping()
{
var products = new List <Product>
{
new Product {
Name = "PC", Price = 450.00f, Category = ProductCategory.Computers
},
new Product {
Name = "Monitor", Price = 180.99f, Category = ProductCategory.Computers
},
new Product {
Name = "Printer", Price = 180.99f, Category = ProductCategory.Computers
},
new Product {
Name = "Car", Price = 12749.00f, Category = ProductCategory.Vehicles
},
};
var productsGroupedByCategory = products.GroupBy(p => p.Category);
var productsGroupedByCategoryThenByPrice = from product in products
group product by product.Category into categoryGroup
from categoryProduct in
from product in categoryGroup
group product by product.Price
group categoryProduct by categoryGroup.Key;
var ss = new SerialStream();
ss.Serialize(productsGroupedByCategory.First());
ss.Serialize(productsGroupedByCategory);
ss.Serialize(productsGroupedByCategoryThenByPrice);
var bytes = ss.ToByteArray();
ss = new SerialStream(bytes);
var deserializedProductsGroupedByFirstCategory = ss.DeserializeIGrouping <ProductCategory, Product>();
TestIGrouping(productsGroupedByCategory.First(), deserializedProductsGroupedByFirstCategory);
var deserializedProductsGroupedByCategory = ss.DeserializeIEnumerable <IGrouping <ProductCategory, Product> >();
TestIEnumerableIGrouping(productsGroupedByCategory, deserializedProductsGroupedByCategory);
var deserializedProductsGroupedByCategoryThenByPrice = ss.DeserializeIEnumerable <IGrouping <ProductCategory, IGrouping <float, Product> > >();
TestIEnumerableIGroupingIGrouping(productsGroupedByCategoryThenByPrice, deserializedProductsGroupedByCategoryThenByPrice);
void TestIEnumerableIGroupingIGrouping <TFirstKey, TSecondKey, TElement>(IEnumerable <IGrouping <TFirstKey, IGrouping <TSecondKey, TElement> > > first, IEnumerable <IGrouping <TFirstKey, IGrouping <TSecondKey, TElement> > > second)
{
TestIEnumerableIGrouping(first, second);
for (var i = 0; i < first.Count(); i++)
{
TestIEnumerableIGrouping(first.ElementAt(i), second.ElementAt(i));
}
}
void TestIEnumerableIGrouping <TKey, TElement>(IEnumerable <IGrouping <TKey, TElement> > first, IEnumerable <IGrouping <TKey, TElement> > second)
{
var firstCount = first.Count();
Assert.AreEqual(firstCount, second.Count());
for (var i = 0; i < firstCount; i++)
{
var firstElementAti = first.ElementAt(i);
var secondElementAti = second.ElementAt(i);
Assert.AreEqual(firstElementAti.Key, secondElementAti.Key);
if (typeof(TElement).Name != typeof(IGrouping <,>).Name)
{
TestIGrouping(firstElementAti, secondElementAti);
}
}
}
void TestIGrouping <TKey, TElement>(IGrouping <TKey, TElement> first, IGrouping <TKey, TElement> second)
{
var firstCount = first.Count();
Assert.AreEqual(first.Key, second.Key);
Assert.AreEqual(firstCount, second.Count());
for (var i = 0; i < firstCount; i++)
{
Assert.IsTrue(first.ElementAt(i).Equals(second.ElementAt(i)));
}
}
}