[英]Why do I need to Dispose a System.Net.Mail.MailMessage instance?
What unmanaged resources does it allocates that needs to be disposed? 它需要分配哪些非托管资源? Isn't it just a simple array of managed data?
它不仅仅是一个简单的托管数据阵列吗? So why disposing?
那么为什么要处置呢?
A mail message has attachments -> attachments are Streams -> Streams are to be disposed. 邮件消息包含附件 - >附件是Streams - > Streams将被丢弃。
Here is the decompiled Dispose method of MailMessage: 这是MailMessage的反编译Dispose方法:
protected virtual void Dispose(bool disposing)
{
if (disposing && !this.disposed)
{
this.disposed = true;
if (this.views != null)
{
this.views.Dispose();
}
if (this.attachments != null)
{
this.attachments.Dispose();
}
if (this.bodyView != null)
{
this.bodyView.Dispose();
}
}
}
As a general rule a class should implement IDisposable if any of its contained children implement it. 作为一般规则,如果任何包含的子节点实现它,则类应该实现IDisposable。
A MailMessage can have attachments, an attachment is represented by MIME part which itself holds a Stream. MailMessage可以有附件,附件由MIME部分表示,MIME部分本身包含Stream。 This Stream needs closing as it might hold an unmanaged pointer to the underlying data.
此Stream需要关闭,因为它可能包含指向底层数据的非托管指针。
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