C# 結構與類別總結 (3) — Equals() 行為實測程式碼與輸出驗證

定義結構與類別

struct StructurePerson { public string FirstName; public string LastName; }
class ClassPerson { public string FirstName; public string LastName; }

實測程式碼

StructurePerson strX = new StructurePerson { LastName = "Bejaoui", FirstName = "Bechir" };
StructurePerson strY = new StructurePerson { LastName = "Bejaoui", FirstName = "Bechir" };
if (strX.Equals(strY)) Console.WriteLine("strX = strY"); // 輸出 strX = strY

ClassPerson clsX = new ClassPerson { LastName = "Bejaoui", FirstName = "Bechir" };
ClassPerson clsY = new ClassPerson { LastName = "Bejaoui", FirstName = "Bechir" };
if (clsX.Equals(clsY)) Console.WriteLine("clsX = clsY"); // 輸出 clsX != clsY

結果解讀

• 結構：值相等 → true。
• 類別：不同實例 → 參考不同 → false。

驗證結構為值類型、類別為參考類型的核心差異。