什么都不說了, 一切都在代碼里:

 

 1             string a1 = "aaa";  // 在堆中分配"aaa"
 2             string a2 = "aaa";  // 堆中已有"aaa", 則不再給"aaa"分配新空間,a2指向a1的地址
 3             string a3 = new string("aaa".ToCharArray()); // new產(chǎn)生新的對象，分配新的空間
 4
 5             Console.WriteLine(object.ReferenceEquals(a1, "aaa")); //Ture
 6             Console.WriteLine(object.ReferenceEquals(a1, a2));    //True
 7             Console.WriteLine(object.ReferenceEquals(a1, a3));    //False
 8
 9             string b1 = "bbb";
10
11             string c1 = "aaabbb";        // 定義"aaabbb"
12             string c2 = "aaa" + "bbb";   // "aaa"和"bbb"都是常量, 合成為"aaabbb"指向c1
13             string c3 = a1 + "bbb";      // a1是變量, 則給c3分配新的空間
14             string c4 = a1 + b1;         // 同上, c4分配新的空間
15             string c5 = a1 + b1;         // 同上, c5分配新的空間
16
17             Console.WriteLine(object.ReferenceEquals(c1, c2));  //True
18             Console.WriteLine(object.ReferenceEquals(c1, c3));  //False
19             Console.WriteLine(object.ReferenceEquals(c1, c4));  //False
20             Console.WriteLine(object.ReferenceEquals(c3, c4));  //False
21             Console.WriteLine(object.ReferenceEquals(c5, c4));  //False