不可能填写html身体内容，



没有其他办法，



你可以从c＃代码后面做到这一点仅用于outlook，而不是任何gmail，yahoo等...



mailto是打开默认电子邮件客户端窗口的唯一选项

It is not possibe to fill html content in body,

there is no other way,

you can do it from c# code behind only for outlook, not any gmail, yahoo etc...

mailto is the only option to open default email client window