C#运算符重载和转换运算符实例（两个结构）

struct Celsius
{
　　private float degrees;
　　public float Degrees
　　{
　　　　get { return this.degrees; }
　　}
public Celsius(float temp)
{
　　this.degrees = temp;
　　Console.WriteLine("这是摄氏温度的构造！");
}
public static Celsius operator +(Celsius x, Celsius y)//重载+运算符
{
　　return new Celsius(x.degrees + y.degrees);
}
public static Celsius operator -(Celsius x, Celsius y)//重载-运算符
{
　　return new Celsius(x.degrees - y.degrees);
}
/// <summary>
/// 隐式将Celsius转换成float
/// </summary>
/// <param name="c">Celsius类型参数</param>
/// <returns>float类型返回值</returns>
public static implicit operator float(Celsius c)
{
　　return c.Degrees;
}
/// <summary>
/// 隐式的将float转换成Celsius
/// </summary>
/// <param name="f">float类型参数</param>
/// <returns>Celsius类型返回值</returns>
public static implicit operator Celsius(float f)
{
　　Celsius c = new Celsius(f);
　　return c;
}
/// <summary>
/// 转换运算符，显示的将Celsius类型转换成Fahrenheit类型
/// </summary>
/// <param name="c">Celsius类型参数</param>
/// <returns>Fahrenheit类型返回值</returns>
/// 
public static explicit operator Fahrenheit(Celsius c)
{
　　float fl=((9.0f / 5.0f) * c.Degrees + 32);//Celsius类型转换成Fahrenheit的规则
　　Fahrenheit f = new Fahrenheit(fl);
　　return f;
}

public override string ToString()//重写ToString
{
　　return this.Degrees.ToString();
}
}

 

struct Fahrenheit
{
　　private float degrees;
　　　public float Degrees
　　{
　　　　get { return this.degrees; }
　　}
public Fahrenheit(float temp)
{
　　this.degrees = temp;
　　Console.WriteLine("这是华氏温度的构造！");
}

public static Fahrenheit operator +(Fahrenheit x, Fahrenheit y)
{
　　return new Fahrenheit(x.degrees + y.degrees);
}
public static Fahrenheit operator -(Fahrenheit x, Fahrenheit y)
{
　　return new Fahrenheit(x.degrees - y.degrees);
}

public static implicit operator float(Fahrenheit c)
{
　　return c.Degrees;
}
public static implicit operator Fahrenheit(float f)
{
　　Fahrenheit fa = new Fahrenheit(f);
　　return fa;
}

public static explicit operator Celsius(Fahrenheit f)
{
　　float fl = (5.0f / 9.0f) * (f.Degrees - 32);
　　Celsius c = new Celsius(fl);
　　return c;
}

public override string ToString()
{
　　return this.Degrees.ToString();
}
}

 
class Program
{
static void Main(string[] args)
{
　　Fahrenheit f = new Fahrenheit(100f);
　　Console.WriteLine("{0} fahrenheit = {1} celsius", f.Degrees, (Celsius)f);

　　Celsius c = 32f;//隐式将float转换成celsius
　　Console.WriteLine("{0} celsius = {1} fahrenheit",c.Degrees,(Fahrenheit)c);

　　Fahrenheit f2 = f + (Fahrenheit)c;//验证Fahrenheit的+重载
　　Console.WriteLine("{0} + {1} = {2} fahernheit",f.Degrees,(Fahrenheit)c,f2.Degrees);

　　Fahrenheit f3 = 100f;//隐式将float转换成Fahrenheit
　　Console.WriteLine("{0} fahrenheit",f3.Degrees);
}
}