使用c#打开带有附件的默认邮件客户端窗口

using System;
using System.Diagnostics;

class Program
{
    static void Main()
    {
        string recipient = "recipient@example.com";
        string subject = "Hello";
        string body = "This is the email body";
        string attachmentPath = "C:\\path\\to\\attachment.pdf";

        Process.Start($"mailto:{recipient}?subject={Uri.EscapeDataString(subject)}&body={Uri.EscapeDataString(body)}&attachment={Uri.EscapeDataString(attachmentPath)}");
    }
}