Dossier d'apprentissage C# : Suggestions pour écrire du code de haute qualité et l'améliorer 9-15

class FirstType : IComparable<FirstType>
{
    public string name;
    public int age;
    public FirstType(int age)
    {
        name = "aa";
        this.age = age;
    }

    public int CompareTo(FirstType other)
    {
        return other.age.CompareTo(age);
    }
}

static void Main(string[] args)
{
    FirstType f1 = new FirstType(3);
    FirstType f2 = new FirstType(5);
    FirstType f3 = new FirstType(2);
    FirstType f4 = new FirstType(1);

    List<FirstType> list = new List<FirstType>
    {
        f1,f2,f3,f4
    };

    list.Sort();

    foreach (var item in list)
    {
        Console.WriteLine(item);
    }
}

class Program : IComparer<FirstType>
{
    static void Main(string[] args)
    {
        FirstType f1 = new FirstType(3);
        FirstType f2 = new FirstType(5);
        FirstType f3 = new FirstType(2);
        FirstType f4 = new FirstType(1);

        List<FirstType> list = new List<FirstType>
        {
            f1,f2,f3,f4
        };

        list.Sort(new Program());

        foreach (var item in list)
        {
            Console.WriteLine(item);
        }
    }

    int IComparer<FirstType>.Compare(FirstType x, FirstType y)
    {
        return x.age.CompareTo(y.age);
    }
}

public override int GetHashCode()
{
    //这样写是为了减少HashCode重复的概率，至于为什么这样写我也不清楚。。 记着就行
    return (System.Reflection.MethodBase.GetCurrentMethod().DeclaringType.FullName +
            "#" + age).GetHashCode();
}

class FirstType : IEquatable<FirstType>
{
    public string name;
    public int age;
    public FirstType(int age)
    {
        name = "aa";
        this.age = age;
    }

    public override bool Equals(object obj)
    {
        return age.Equals(((FirstType)obj).age);
    }

    public bool Equals(FirstType other)
    {
        return age.Equals(other.age);
    }

    public override int GetHashCode()
    {
        return (System.Reflection.MethodBase.GetCurrentMethod().DeclaringType.FullName +
                "#" + age).GetHashCode();
    }

}

class Person : IFormattable
{
    public override string ToString()
    {
        return "Default Hello";
    }

    public string ToString(string format, IFormatProvider formatProvider)
    {

        switch (format)
        {
            case "Chinese":
                return "你好";
            case "English":
                return "Hello";
        }
        return "helo";
    }
}

static void Main(string[] args)
{
    Person p1 = new Person();
    Console.WriteLine(p1);
    Console.WriteLine(p1.ToString("Chinese",null));
    Console.WriteLine(p1.ToString("English", null));
}

//记得在类前添加[Serializable]的标志
[Serializable]
class Person : ICloneable
{
    public string name;

    public Child child;

    public object Clone()
    {
        //浅拷贝
        return this.MemberwiseClone();
    }

    /// <summary>
    /// 深拷贝
    /// 我也不清楚为什么这样写
    /// </summary>
    /// <returns></returns>
    public Person DeepClone()
    {
        using (Stream objectStream = new MemoryStream())
        {
            IFormatter formatter = new BinaryFormatter();
            formatter.Serialize(objectStream, this);
            objectStream.Seek(0, SeekOrigin.Begin);
            return formatter.Deserialize(objectStream) as Person;
        }
    }
}

[Serializable]
class Child
{
    public string name;
    public Child(string name)
    {
        this.name = name;
    }

    public override string ToString()
    {
        return name;
    }
}

static void Main(string[] args)
{
    //使用反射
    Stopwatch watch = Stopwatch.StartNew();
    Person p1 = new Person();
    var add = typeof(Person).GetMethod("Add");
    for (int i = 0; i < 1000000; i++)
    {
        add.Invoke(p1, new object[] { 1, 2 });
    }
    Console.WriteLine(watch.ElapsedTicks);


    //使用dynamic
    watch.Reset();
    watch.Start();
    dynamic d1 = new Person();
    for (int i = 0; i < 1000000; i++)
    {
        d1.Add(1, 2);
    }
    Console.WriteLine(watch.ElapsedTicks);
}