C# 3.0 - Object And Collection Initializers
C# 3.0 新語法 Object Initializers，主要是用來簡化『物件初始化 』並『設定屬性』，將兩者的動作化合而為一。以下範例，主要是實作 Product 類別練習 Object Initializers 與 Collection Initializers 包含 Generic Collection List<T> 與 Dictionary<TKey, TValue>。
實作 Product 類別，並使用 Automatic Properties 來建立 ProductName 及 ProductPrice 屬性：
1: public class Product
2: { 3: // Automatic properties
4: public string ProductName{ get; set; }
5: public int ProductPrice { get; set; }
6: 7: public override string ToString()
8: { 9: return string.Format("ProductName: {0}, ProductPrice: {1}", ProductName, ProductPrice);
10: } 11: }
一般類別變數宣告方式：
1: // 傳統宣告方式
2: Product p1 = new Product();
3: p1.ProductName = "A";
4: p1.ProductPrice = 100; 5: Console.WriteLine(p1.ToString()); 6: /* Output:
7: * ProductName: A, ProductPrice: 100
8: */
Object Initializers：
1: // Object Initializers
2: Product p2 = new Product() { ProductName = "B", ProductPrice = 200 };
3: Console.WriteLine(p2.ToString()); 4: /* Output:
5: * ProductName: B, ProductPrice: 200
6: */
Object Initializers Without Constructor：
1: // Object Initializers Without Constructor
2: Product p3 = new Product { ProductName = "C", ProductPrice = 300 };
3: Console.WriteLine(p3.ToString()); 4: /* Output:
5: * ProductName: C, ProductPrice: 300
6: */
Object and Collection Initializers Without Constructor：
1: // Object and Collection Initializers Without Constructor
2: List<Product> pList2 = new List<Product>
3: { 4: new Product { ProductName = "F", ProductPrice = 600 },
5: new Product { ProductName = "G", ProductPrice = 700 }
6: }; 7: foreach (Product p in pList2)
8: { 9: Console.WriteLine(p.ToString()); 10: } 11: /* Output:
12: * ProductName: F, ProductPrice: 600
13: * ProductName: G, ProductPrice: 700
14: */
Object and Dictionary Collection Initializers Without Constructor：
1: // Object and Dictionary Collection Initializers Without Constructor
2: Dictionary<string, Product> pDictionary = new Dictionary<string, Product>
3: { 4: {"HHH", new Product { ProductName = "H", ProductPrice = 800 } },
5: {"III", new Product { ProductName = "I", ProductPrice = 900 } }
6: }; 7: foreach (KeyValuePair<string, Product> pPair in pDictionary)
8: { 9: Console.WriteLine(pPair.Value.ToString()); 10: } 11: /* Output:
12: * ProductName: H, ProductPrice: 800
13: * ProductName: I, ProductPrice: 900
14: */