C#静态类型不能用作参数 [英] C# Static types cannot be used as parameters

问题描述

public static void SendEmail(String from, String To, String Subject, String HTML, String AttachmentPath = null, String AttachmentName = null, MediaTypeNames AttachmentType = null)
{
    ....

    // Add an attachment if required
    if (AttachmentPath != null)
    {
        var ct = new ContentType(MediaTypeNames.Text.Plain);
        using (var a = new Attachment(AttachmentPath, ct)
                    {
                        Name = AttachmentName,
                        NameEncoding = Encoding.UTF8,
                        TransferEncoding = TransferEncoding.Base64
                    })
        {
            mailMessage.Attachments.Add(a);
        }
    }

    ....
}

如您所见， MediaTypeNames AttachmentType 会引发错误:

As you can see the MediaTypeNames AttachmentType throws the error:

'System.Net.Mime.MediaTypeNames': static types cannot be used as parameters

处理此问题的最佳方法是什么?

What is the best way to deal with this?

推荐答案

您不能将静态类型作为参数传递给方法，因为这样一来就必须实例化它，并且不能创建a的实例. static 类.

You can't pass a static type to a method as a parameter because then it would have to be instantiated, and you can't create an instance of a static class.

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