使用输出参数在EF 6中调用存储过程？

Question

我有一个MVC 5项目，我正在试图弄清楚如何调用具有输出参数的Oracle存储过程。我已经做了一些搜索，这是我最接近的但是我得到一个错误，它是无效的SQL。

即使我让它成功运行，我假设它会将输出值传递给结果对象并填充IsValid和Remarks属性？

public class ValidateCSPolicyResult
{
    public string IsValid { get; set; }
    public string Remarks { get; set; }
}

using (var ctx = new DataContext())
{

    var empId = new SqlParameter("@empId", employeeId);
    var startDate = new SqlParameter("@startDate", startDateTime);
    var endDate = new SqlParameter("@endDate", endDateTime);
    var swapEmpId = new SqlParameter("@swapEmpId", swapEmployeeId);

    var isValid = new SqlParameter
    {
        ParameterName = "Valid",
        Value = "N",
        Direction = ParameterDirection.Output
    };

    var remarks = new SqlParameter
    {
        ParameterName = "Remarks",
        Value = "",
        Direction = ParameterDirection.Output
    };


    var results = ctx.Database.SqlQuery(ValidateCSPolicyResult)("VALIDATE_CSW_POLICY  @empId, @startDate, @endDate, @swapEmpId, @Valid out, @Remarks out").FirstOrDefault();

}