PhysicalAddress.None 字段

定义

命名空间:

System.Net.NetworkInformation

程序集:

System.Net.NetworkInformation.dll

Source:

PhysicalAddress.cs

返回一个具有零长度地址的新 PhysicalAddress 实例。 此字段为只读。

public: static initonly System::Net::NetworkInformation::PhysicalAddress ^ None;

public static readonly System.Net.NetworkInformation.PhysicalAddress None;

 staticval mutable None : System.Net.NetworkInformation.PhysicalAddress

Public Shared ReadOnly None As PhysicalAddress 

字段值

PhysicalAddress

示例

下面的代码示例演示如何使用此字段来测试分析地址的结果。

PhysicalAddress^ StrictParseAddress( String^ address )
{
   PhysicalAddress^ newAddress = PhysicalAddress::Parse( address );
   if ( PhysicalAddress::None->Equals( newAddress ) )
      return nullptr;

   return newAddress;
}

public static PhysicalAddress? StrictParseAddress(string? address)
{
    PhysicalAddress newAddress = PhysicalAddress.Parse(address);
    if (PhysicalAddress.None.Equals(newAddress))
        return null;

    return newAddress;
}

注解

如果指定null地址，方法Parse将None返回 。