C#发送HTML邮件时含空格的网络路径截断及编码异常问题求助

开发者阿泽

2026-7-23

问题修复方案

核心问题分析

HTML链接的href值未加引号包裹，邮件客户端会将空格识别为链接结束符，导致路径截断
UNC共享路径未转换为标准file:// URI格式，客户端无法正确解析
UrlEncode会将空格转为加号，不符合文件路径的编码规范

修复后的代码

public void sendEmail(List<string> toList)
{
    string from = "test@test.com";
    string UserName = ConfigurationManager.AppSettings["UserName"].ToString();
    string password = ConfigurationManager.AppSettings["password"].ToString();
    
    // 处理UNC路径：转换为标准file URI并正确编码空格
    string uncPath = @"\\pcm-test2\shared\PCM_GEO_TEST\NGS Forms";
    Uri fileUri = new Uri(uncPath);
    string encodedPath = fileUri.AbsoluteUri; // 自动转换为file:////pcm-test2/shared/PCM_GEO_TEST/NGS%20Forms
    
    // 构建带引号包裹的HTML链接
    StringBuilder TelURL = new StringBuilder()
        .Append("<a href=\"")
        .Append(encodedPath)
        .Append("\">HERE</a>"); 

    using (MailMessage mm = new MailMessage())
    {
        mm.From = new MailAddress(from);
        mm.To.Add(new MailAddress("rimi@test1.com"));
        mm.Subject = "Test subject";
        mm.Body = TelURL.ToString();
        mm.IsBodyHtml = true;

        SmtpClient client = new SmtpClient();
        client.Credentials = new NetworkCredential(UserName, password);
        client.Port = 111;
        client.EnableSsl = true;
        client.Host = "smtp.office365.com";
        client.DeliveryMethod = SmtpDeliveryMethod.Network;
        client.Send(mm);
    }
}