将写内容过程比较常用的内容片段备份一下，下面资料是关于C#演示用户定义的类如何能够重载运算符的内容。
using System;
public struct Complex
{
public int real;
public int imaginary;
public Complex(int real, int imaginary)
{
this.real = real;
this.imaginary = imaginary;
}
public static Complex operator +(Complex c1, Complex c2)
{
return new Complex(c1.real + c2.real, c1.imaginary + c2.imaginary);
}
public override string ToString()
{
return(String.Format("{0} + {1}i", real, imaginary));
}
public static void Main()
{
Complex num1 = new Complex(2,3);
Complex num2 = new Complex(3,4);
Complex sum = num1 + num2;
Console.WriteLine("First complex number: {0}",num1);
Console.WriteLine("Second complex number: {0}",num2);
Console.WriteLine("The sum of the two numbers: {0}",sum);
}
}
代码2
using System;
public struct DBBool
{
public static readonly DBBool dbNull = new DBBool(0);
public static readonly DBBool dbFalse = new DBBool(-1);
public static readonly DBBool dbTrue = new DBBool(1);
int value;
DBBool(int value)
{
this.value = value;
}
public static implicit operator DBBool(bool x)
{
return x? dbTrue: dbFalse;
}
public static explicit operator bool(DBBool x)
{
if (x.value == 0) throw new InvalidOperationException();
return x.value > 0;
}
public static DBBool operator ==(DBBool x, DBBool y)
{
if (x.value == 0 || y.value == 0) return dbNull;
return x.value == y.value? dbTrue: dbFalse;
}
public static DBBool operator !=(DBBool x, DBBool y)
{
if (x.value == 0 || y.value == 0) return dbNull;
return x.value != y.value? dbTrue: dbFalse;
}
public static DBBool operator !(DBBool x)
{
return new DBBool(-x.value);
}
public static DBBool operator &(DBBool x, DBBool y)
{
return new DBBool(x.value < y.value? x.value: y.value);
}
public static DBBool operator |(DBBool x, DBBool y)
{
return new DBBool(x.value > y.value? x.value: y.value);
}
public static bool operator true(DBBool x)
{
return x.value > 0;
}
public static bool operator false(DBBool x)
{
return x.value < 0;
}
public static implicit operator string(DBBool x)
{
return x.value > 0 ? "dbTrue"
: x.value < 0 ? "dbFalse"
: "dbNull";
}
public override bool Equals(object o)
{
try
{
return (bool) (this == (DBBool) o);
}
catch
{
return false;
}
}
public override int GetHashCode()
{
return value;
}
public override string ToString()
{
switch (value)
{
case -1:
return "DBBool.False";
case 0:
return "DBBool.Null";
case 1:
return "DBBool.True";
default:
throw new InvalidOperationException();
}
}
}
class Test
{
static void Main()
{
DBBool a, b;
a = DBBool.dbTrue;
b = DBBool.dbNull;
Console.WriteLine( "!{0} = {1}", a, !a);
Console.WriteLine( "!{0} = {1}", b, !b);
Console.WriteLine( "{0} & {1} = {2}", a, b, a & b);
Console.WriteLine( "{0} | {1} = {2}", a, b, a | b);
if (b)
Console.WriteLine("b is definitely true");
else
Console.WriteLine("b is not definitely true");
}
}
