c# - C#继承: How to invoke the base class constructor when i call the derived class constructor

我试图弄清楚在调用派生类构造函数时如何调用基类构造函数。

我有一个名为“AdditionalAttachment”的类，该类继承自System.Net.Mail.Attachment。我在新类中添加了另外2个属性，以便可以将现有Attachment类的所有属性与新属性一起使用

public class AdditionalAttachment: Attachment
{
   [DataMember]
   public string AttachmentURL
   {
       set;
       get;
   }
   [DataMember]
   public string DisplayName
   {
       set;
       get;
   }
}

之前我曾经创建过类似的构造函数

//objMs是一个MemoryStream对象

Attachment objAttachment = new Attachment(objMs, "somename.pdf")

我想知道如何为我的类创建相同类型的构造函数，该类构造函数的作用与上述基类的构造函数相同

最佳答案

这会将您的参数传递给基类的构造函数:

public AdditionalAttachment(MemoryStream objMs, string displayName) : base(objMs, displayName)
{
   // and you can do anything you want additionally
   // here (the base class's constructor will have
   // already done its work by the time you get here)
}