static void Main()
{
var janet = new Person { FirstName = "Janet", LastName = "Jackson" };
Person[] persons1 = { new Person { FirstName = "Michael", LastName = "Jackson" }, janet };
Person[] persons2 = { new Person { FirstName = "Michael", LastName = "Jackson" }, janet };
if (persons1 != persons2)
Console.WriteLine("not the same reference");
if (!persons1.Equals(persons2))
Console.WriteLine("equals returns false - not the same reference");
if ((persons1 as IStructuralEquatable).Equals(persons2, EqualityComparer<Person>.Default))
{
Console.WriteLine("the same content");
}
var t1 = Tuple.Create<int, string>(1, "Stephanie");
var t2 = Tuple.Create<int, string>(1, "Stephanie");
if (t1 != t2)
Console.WriteLine("not the same reference to the tuple");
if (t1.Equals(t2))
Console.WriteLine("equals returns true");
TupleComparer tc = new TupleComparer();
if ((t1 as IStructuralEquatable).Equals(t2, tc))
{
Console.WriteLine("yes, using TubpleComparer");
}
}
static void Main()
{
var janet = new Person {
FirstName = "Janet", LastName = "Jackson"
};
Person[] persons1 = { new Person {
FirstName = "Michael", LastName = "Jackson"
}, janet };
Person[] persons2 = { new Person {
FirstName = "Michael", LastName = "Jackson"
}, janet };
WriteLine($"{persons1[0]} | {persons1[1]}");
WriteLine($"{persons2[0]} | {persons2[1]}");
if (persons1 != persons2)
{
WriteLine("not the same reference");
}
if (!persons1.Equals(persons2))
{
WriteLine("equals returns false - not the same reference");
}
if ((persons1 as IStructuralEquatable).Equals(persons2, EqualityComparer <Person> .Default))
{
WriteLine("the same content");
}
var t1 = Tuple.Create <int, string>(1, "Stephanie");
var t2 = Tuple.Create <int, string>(1, "Stephanie");
if (t1 != t2)
{
WriteLine("not the same reference to the tuple");
}
if (t1.Equals(t2))
{
WriteLine("equals returns true");
}
var tc = new TupleComparer();
if ((t1 as IStructuralEquatable).Equals(t2, tc))
{
WriteLine("yes, using TupleComparer");
}
if ((t1 as IStructuralEquatable).Equals(t2, new TupleComparer()))
{
WriteLine("equals using TupleComparer");
}
}
static void Main()
{
Person[] persons1 = { new Person {
FirstName = "Michael", LastName = "Jackson"
} };
Person[] persons2 = { new Person {
FirstName = "Michael", LastName = "Jackson"
} };
// 比较的是地址..
if (persons1 != persons2)
{
Console.WriteLine("not the same reference");
}
// 数组没有实现 Equals 方法, 检测也会不相等
if (!persons1.Equals(persons2))
{
Console.WriteLine("equals returns false - not the same reference");
}
// 转换成 IStructuralEquatable 就可以实现比较
if ((persons1 as IStructuralEquatable).Equals(persons2, EqualityComparer <Person> .Default))
{
Console.WriteLine("the same content");
}
//------------------------------------------------
var t1 = Tuple.Create <int, string>(1, "Stephanie");
var t2 = Tuple.Create <int, string>(1, "Stephanie");
// 比较的是地址
if (t1 != t2)
{
Console.WriteLine("not the same reference to the tuple");
}
// 相等, Tuple 有 Equal 方法
if (t1.Equals(t2))
{
Console.WriteLine("equals returns true");
}
// 使用自定义比较器
TupleComparer tc = new TupleComparer();
if ((t1 as IStructuralEquatable).Equals(t2, tc))
{
Console.WriteLine("yes, using TubpleComparer");
}
}