C# 附加pdf时sendGrid在c中不起作用#

我已经在c#中使用sendGrid编写了一个邮件发送功能。它工作正常，但当附加生成的pdf作为附件时，它不工作

var client = new SendGridClient(apiKey);
var msg = new SendGridMessage()
{
    From = new EmailAddress(senderMailID, senderName),
    Subject = "ABCD",

};

var attach = new Attachment();
attach.Filename = "ABC.pdf";
attach.Content = "~/Templates/output.pdf";

msg.AddAttachment(attach);

msg.AddTo(new EmailAddress(receiverMailID,receiverName));
    var result = await client.SendEmailAsync(msg);

}

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您应该将文件转换为文件的base64表示形式（如示例所示），而不是向其添加路径

所需的代码示例：

var client = new SendGridClient(apiKey);
var msg = new SendGridMessage()
{
    From = new EmailAddress(senderMailID, senderName),
    Subject = "ABCD",

};
var bytes = File.ReadAllBytes("~/Templates/output.pdf");
var file = Convert.ToBase64String(bytes);
msg.AddAttachment("ABC.pdf", file);
var response = await client.SendEmailAsync(msg);

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您可以通过指定哪些不起作用来改进此问题。例如，包括抛出的异常。您的代码将文件路径指定为附件的内容