C#默认等于行为。
示例
Equals在Object类本身中声明。
public virtual bool Equals(Object obj);
默认情况下，Equals具有以下行为：
如果实例是引用类型，则Equals仅当引用相同时才返回true。
如果实例是值类型，则Equals仅当类型和值相同时才返回true。
string是一个特例。它的行为类似于值类型。
namespace ConsoleApplication
{
public class Program
{
public static void Main(string[] args)
{
//areFooClassEqual：否
Foo fooClass1 = new Foo("42");
Foo fooClass2 = new Foo("42");
bool areFooClassEqual = fooClass1.Equals(fooClass2);
Console.WriteLine("fooClass1 and fooClass2 are equal: {0}", areFooClassEqual);
//False
//areFooIntEqual：正确
int fooInt1 = 42;
int fooInt2 = 42;
bool areFooIntEqual = fooInt1.Equals(fooInt2);
Console.WriteLine("fooInt1 and fooInt2 are equal: {0}", areFooIntEqual);
//areFooStringEqual：真
string fooString1 = "42";
string fooString2 = "42";
bool areFooStringEqual = fooString1.Equals(fooString2);
Console.WriteLine("fooString1 and fooString2 are equal: {0}", areFooStringEqual);
}
}
public class Foo
{
public string Bar { get; }
public Foo(string bar)
{
Bar = bar;
}
}
}