你还可以这么做……您需要一个能够有参数而没有参数的方法。

为什么不试试这个……

public ActionResult Show( string username = null )
{
   ...
}

这对我很有效……在这个方法中，你可以测试是否有传入参数。

已更新以删除字符串上无效的nullable语法并使用默认参数值。

将基方法创建为virtual

public virtual ActionResult Index()

将被覆盖的方法创建为override

public override ActionResult Index()

编辑:这显然只适用于当override方法在一个派生类中，而这似乎不是OP的意图。

我需要一个过载:

public ActionResult Index(string i);
public ActionResult Index(int groupId, int itemId);

很少有足够的争论，我最终这样做:

public ActionResult Index(string i, int? groupId, int? itemId)
{
    if (!string.IsNullOrWhitespace(i))
    {
        // parse i for the id
    }
    else if (groupId.HasValue && itemId.HasValue)
    {
        // use groupId and itemId for the id
    }
}

这不是一个完美的解决方案，尤其是当你有很多争论的时候，但它对我来说很有效。

This answer for those who struggling with the same issue. You can implement your own custom filter based on ActionMethodSelectorAttribute. Here I found the best solution for solving your question. Works fine on .net 5 project. If you try to implement the same logic as was in web api controllers then use Microsoft.AspNetCore.Mvc.WebApiCompatShim. This nuget package provides compatibility in ASP.NET Core MVC with ASP.NET Web API 2 to simplify migration of existing Web API implementations. Please check this answer but consider that starting with ASP.NET Core 3.0, the Microsoft.AspNetCore.Mvc.WebApiCompatShim package is no longer available.

我在申请的时候也遇到过同样的问题。没有Modifiyig任何方法信息，我已经提供了[ActionName(“SomeMeaningfulName”)]在动作头部。问题解决

[ActionName("_EmployeeDetailsByModel")]
        public PartialViewResult _EmployeeDetails(Employee model)
        {
            // Some Operation                
                return PartialView(model);
            }
        }

[ActionName("_EmployeeDetailsByModelWithPagination")]
        public PartialViewResult _EmployeeDetails(Employee model,int Page,int PageSize)
        {

                // Some Operation
                return PartialView(model);

        }

您可以使用[ActionName("NewActionName")]来使用不同名称的相同方法:

public class HomeController : Controller
{
    public ActionResult GetEmpName()
    {
        return Content("This is the test Message");
    }

    [ActionName("GetEmpWithCode")]
    public ActionResult GetEmpName(string EmpCode)
    {
        return Content("This is the test Messagewith Overloaded");
    }
}