!!!主要需要注意 serverUrl需要以/结尾!!!
需要注意引用Microsoft.Extensions.Configuration.Abstractions
1.

//serverUrl需要以“/”结尾
K3CloudApi client = new K3CloudApi("http://xxx.xxx.xxx.xxx/k3cloud/");
var ret = client.LoginByAppSecret("xx", "xx", "xx", "xx", 2052);
K3CloudApi client = new K3CloudApi(new ThirdPassPortInfo
{
ApiAppId = "xxx",
AppSec = "xxx",
CloudDbId = "x",xx
CloudUrl = "http://xxx.xxx.xxx.xxx/k3cloud/",
CloudUser = "xxx",
Language = "2052"
}, 1000);
  1. 也可以手动调用client.LoginByAppSecret

[参考]
​​金蝶云php webapi,金蝶云星空(WebApi集成方式):免密码登录接口​​​如何使用SDK?