IMEX.mes.api/wwwroot/api/test/testWebService.asmx

<%@ WebService Language="C#" Class="WebService" %>

using System;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消注释以下行。 
[System.Web.Script.Services.ScriptService]
public class WebService  : System.Web.Services.WebService {

    [WebMethod]
    public string HelloWorld(string name) {
        return "Hello World" + name;
    }
    
}