PhysicalAddress.None 欄位

定義

命名空間:

System.Net.NetworkInformation

組件:

System.Net.NetworkInformation.dll

來源:

PhysicalAddress.cs

傳回新的 PhysicalAddress 執行個體，其中含有長度為零的位址。 此欄位為唯讀。

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 

欄位值

PhysicalAddress

範例

下列程式代碼範例示範如何使用此欄位來測試剖析地址的結果。

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;
}

備註

如果您指定null位址，方法Parse會None傳回 。