源码：
复制代码 代码如下:
[StructLayout(LayoutKind.Explicit)]
public struct IP
{
public IP(UInt32 value)
{
this._text1 = 0;
this._text2 = 0;
this._text3 = 0;
this._text4 = 0;
this._value = value;
}
public IP(Byte text1, Byte text2, Byte text3, Byte text4)
{
this._value = 0;
this._text1 = text1;
this._text2 = text2;
this._text3 = text3;
this._text4 = text4;
}
[FieldOffset(0)]
private UInt32 _value;
[FieldOffset(0)]
private Byte _text1;
[FieldOffset(1)]
private Byte _text2;
[FieldOffset(2)]
private Byte _text3;
[FieldOffset(3)]
private Byte _text4;

public UInt32 Value
{
get { return this._value; }
set { this._value = value; }
}
public Byte Text1
{
get { return this._text1; }
set { this._text1 = value; }
}
public Byte Text2
{
get { return this._text2; }
set { this._text2 = value; }
}
public Byte Text3
{
get { return this._text3; }
set { this._text3 = value; }
}
public Byte Text4
{
get { return this._text4; }
set { this._text4 = value; }
}

public override string ToString()
{
return String.Format("{0}.{1}.{2}.{3}", this._text1.ToString(), this._text2.ToString(),
this._text3.ToString(), this._text4.ToString());
}

public static implicit operator IP(UInt32 value)
{
return new IP(value);
}
public static explicit operator UInt32(IP ip)
{
return ip._value;
}
}

测试：
复制代码 代码如下:
class Program
{
static void Main(string[] args)
{
IP ip = new IP(192,168,1,1);
Console.WriteLine(ip);
UInt32 value = (UInt32)ip;
Console.WriteLine(value);
Console.WriteLine(ip.Value);
IP ip2 = (IP)(1234567);
Console.WriteLine(ip2);

Console.ReadKey();
}
}