<PackageReference Include="FluentEmail.Smtp" Version="2.8.0" />

//如果使用smtp服務(wù)發(fā)送郵件必須要設(shè)置smtp服務(wù)信息
SmtpClient smtp = new SmtpClient
{
  //smtp服務(wù)器地址(我這里以126郵箱為例，可以依據(jù)具體你使用的郵箱設(shè)置)
  Host = "smtp.126.com",
  UseDefaultCredentials = true,
  DeliveryMethod = SmtpDeliveryMethod.Network,
  //這里輸入你在發(fā)送smtp服務(wù)器的用戶名和密碼
  Credentials = new NetworkCredential("郵箱用戶名", "郵箱密碼")
};
//設(shè)置默認(rèn)發(fā)送信息
Email.DefaultSender = new SmtpSender(smtp);
var email = Email
  //發(fā)送人
  .From("zhangsan@126.com")
  //收件人
  .To("lisi@qq.com")
  //抄送人
  .CC("admin@126.com")
  //郵件標(biāo)題
  .Subject("郵件標(biāo)題")
  //郵件內(nèi)容
  .Body("郵件內(nèi)容");
//依據(jù)發(fā)送結(jié)果判斷是否發(fā)送成功
var result = email.Send();
//或使用異步的方式發(fā)送
//await email.SendAsync();
if (result.Successful)
{
  //發(fā)送成功邏輯
}
else
{
  //發(fā)送失敗可以通過result.ErrorMessages查看失敗原因
}

var email = Email
  //發(fā)送人
  .From("zhangsan@126.com")
  //收件人
  .To("lisi@qq.com")
  //抄送人
  .CC("admin@126.com")
  //郵件標(biāo)題
  .Subject("郵件標(biāo)題")
  //只需要額外設(shè)置第二個(gè)參數(shù)為true即可
  .Body("<h1 align=\"center\">.NET大法好</h1><p>是的,這一點(diǎn)毛病都沒有</p>",true);
//發(fā)送
var result = email.Send();

IFluentEmail Body (string body, bool isHtml = false);

var email = Email
  //發(fā)送人
  .From("zhangsan@126.com")
  //郵件標(biāo)題
  .Subject("郵件標(biāo)題")
  //郵件內(nèi)容
  .Body("<h1 align=\"center\">.NET大法好</h1><p>是的,一點(diǎn)毛病都沒有</p>",true);

//構(gòu)建多個(gè)接收人郵箱
string toUserStr = "oldwang@126.com;xiaoming@163.com;xiaoli@qq.com";
List<FluentEmail.Core.Models.Address> toUsers = toUserStr.Split(";")
  .Select(i => new FluentEmail.Core.Models.Address { EmailAddress = i }).ToList();
//支持傳入Address集合
email.To(toUsers)
//抄送人集合
.CC(toUsers);
//發(fā)送
var result = email.Send();

var email = Email
    //發(fā)送人
    .From("zhangsan@qq.com")
    //收件人
    .To("lisi@126.com")
    //抄送人
    .CC("admin@126.com")
    //郵件標(biāo)題
    .Subject("關(guān)于.Net Core怎么樣")
    //郵件內(nèi)容
    .Body("<h1 align=\"center\">.NET Core</h1><p>.Net Core很優(yōu)秀嗎？是的,一點(diǎn)毛病都沒有?。?！</p>",true);

//構(gòu)建附件
var stream = new MemoryStream();
var sw = new StreamWriter(stream);
sw.WriteLine("您好,這是文本里的內(nèi)容");
sw.Flush();
stream.Seek(0, SeekOrigin.Begin);
var attachment = new FluentEmail.Core.Models.Attachment
{
  Data = stream,
  ContentType = "text/plain",
  Filename = "Hello.txt"
};
//添加附件
email.Attach(attachment);
var result = email.Send();

//構(gòu)建附件
var stream = new MemoryStream();
var sw = new StreamWriter(stream);
sw.WriteLine("您好,這是文本里的內(nèi)容");
sw.Flush();
stream.Seek(0, SeekOrigin.Begin);
//附件1
var attachment = new FluentEmail.Core.Models.Attachment
{
  Data = stream,
  ContentType = "text/plain",
  Filename = "Hello.txt"
};

//附件2
var attachment2 = new FluentEmail.Core.Models.Attachment
{
  Data = File.OpenRead(@"D:\test.txt"),
  ContentType = "text/plain",
  Filename = "test.txt"
};

//添加附件
email.Attach(new List<FluentEmail.Core.Models.Attachment> { attachment, attachment2 });
var result = email.Send();

<PackageReference Include="FluentEmail.Razor" Version="2.8.0" />

<MvcRazorExcludeRefAssembliesFromPublish>true</MvcRazorExcludeRefAssembliesFromPublish>

//聲明使用razor的方式
Email.DefaultRenderer = new RazorRenderer();
//razor內(nèi)容
var template = "你好@Model.Name先生, 請(qǐng)核實(shí)您的電話號(hào)碼是否為@Model.Phone";
var email = Email
  .From("lisi@126.com")
  .To("zhangsan@qq.com")
  .Subject("手機(jī)號(hào)核實(shí)")
  //傳遞自定義POCO類
  //.UsingTemplate<UserInfo>(template, new UserInfo { Name = "張三", Phone嗎 = "100110119120" })
  //或傳遞匿名對(duì)象
  .UsingTemplate(template, new { Name = "張三", Phone嗎 = "100110119120" });
var result = await email.SendAsync();

var email = Email
  .From("lisi@126.com")
  .To("zhangsan@qq.com")
  .Subject("手機(jī)號(hào)核實(shí)")
  //傳遞自定義POCO類
  //.UsingTemplateFromFile<UserInfo>($"{Directory.GetCurrentDirectory()}/template.cshtml", 
  //   new UserInfo { Name = "張三", Phone嗎 = "100110119120" });
  //第一個(gè)參數(shù)為視圖文件位置，第二個(gè)參數(shù)為模型對(duì)象
  .UsingTemplateFromFile($"{Directory.GetCurrentDirectory()}/template.cshtml", 
    new { Name = "張三", Phone嗎 = "100110119120" });
var result = await email.SendAsync();

Install-Package RazorLight -Version 2.0.0-beta10

//razor字符串的方式
var engine = new RazorLightEngineBuilder()
	.UseEmbeddedResourcesProject(typeof(Program))
	.UseMemoryCachingProvider()
	.Build();
string template = "Hello, @Model.Name. Welcome to RazorLight repository";
ViewModel model = new ViewModel {Name = "John Doe"};
//result就是解析后的字符串
string result = await engine.CompileRenderStringAsync("templateKey", template, model);

var engine = new RazorLightEngineBuilder()
	.UseFileSystemProject("${Directory.GetCurrentDirectory()}")
	.UseMemoryCachingProvider()
	.Build();
var model = new {Name = "John Doe"};
string result = await engine.CompileRenderAsync("template.cshtml", model);

public void ConfigureServices(IServiceCollection services)
{
  SmtpClient smtp = new SmtpClient
  {
    //smtp服務(wù)器地址(我這里以126郵箱為例，可以依據(jù)具體你使用的郵箱設(shè)置)
    Host = "smtp.qq.com",
    UseDefaultCredentials = true,
    DeliveryMethod = SmtpDeliveryMethod.Network,
    //這里輸入你在發(fā)送smtp服務(wù)器的用戶名和密碼
    Credentials = new NetworkCredential("zhangsan@qq.com", "zhangsan")
  };
  //注入的時(shí)候可以添加一些默認(rèn)的設(shè)置
  services
    //設(shè)置默認(rèn)發(fā)送用戶
    .AddFluentEmail("zhangsan@qq.com")
    //添加razor模板支持
    //.AddRazorRenderer($"{Directory.GetCurrentDirectory()}/Views")
    .AddRazorRenderer()
    //配置默認(rèn)的smtp服務(wù)信息
    .AddSmtpSender(smtp);
}

public async Task<IActionResult> SendEmail([FromServices]IFluentEmail email)
{
   var result = await email//發(fā)送人
    //發(fā)送人
    .From("zhangsan@126.com")
    //收件人
    .To("lisi@qq.com")
    //抄送人
    .CC("admin@126.com")
    //郵件標(biāo)題
    .Subject("郵件標(biāo)題")
    //郵件內(nèi)容
    .Body("郵件內(nèi)容").SendAsync();
  return View();
}

public async Task<IActionResult> SendEmail([FromServices]IFluentEmail email)
{
   var result = await email//發(fā)送人
    //發(fā)送人
    .From("zhangsan@126.com")
    //收件人
    .To("lisi@qq.com")
    //抄送人
    .CC("admin@126.com")
    //郵件標(biāo)題
    .Subject("郵件標(biāo)題")
    //郵件內(nèi)容
    .Body("郵件內(nèi)容").SendAsync();
  return View();
}