无法将属性或索引器“附件”分配给 - 它是只读的答案

【问题标题】：Property or indexer "Attachments" cannot be assigned to -- it is read only无法将属性或索引器“附件”分配给 - 它是只读的
【发布时间】：2016-07-27 01:58:45
【问题描述】：

我正在尝试发送带有图片附件的邮件，但仍然报错（*不能将属性或索引器“附件”分配给——它是只读的 *）

string pathToPic = @"c:\MyDir\Img\img"+ automaticalyGeneratedNumber.toString() + ".png";


using (var message = new MailMessage(fromAddress, toAddress)
            {
                Subject = Environment.MachineName,
                Body = "PC NAME : " + Environment.MachineName + "\r\nIP ADRESS : " + Dns.GetHostEntry(Dns.GetHostName()).AddressList[1],
                Attachments = new Attachment(@"c:\MyDir\Img" + "/img" + (Saving.CountImagesTaken(@"c:\MyDir\Img") - 1).ToString() + ".png"),
            })
            {
                smtp.Send(message);
            }

【问题讨论】：

标签： c# email attachment

【解决方案1】：

为什么要使代码如此复杂。您需要使用message.Attachments.Add，因为Attachments 属性是只读的：

var message = new MailMessage(fromAddress, toAddress)
{
    Subject = Environment.MachineName,
    Body = "PC NAME : " + Environment.MachineName + "\r\nIP ADRESS : " + Dns.GetHostEntry(Dns.GetHostName()).AddressList[1],
};
message.Attachments.Add(new Attachment(@"c:\MyDir\Img" + "/img" + (Saving.CountImagesTaken(@"c:\MyDir\Img") - 1).ToString() + ".png"));
using (message)
{
    smtp.Send(message);
}

【讨论】：