c# - 系统.MissingMethodException : Method not found: 'System.String .get_DayName()'

Question

我有以下类型:

public class TimeBand
{
    public string DayName { get; set; }
    public int customerId { get; set; }
}

我正在创建一个包含 TimeBands 的列表:

var TimeBandList = new List<TimeBand>
    {
        new TimeBand()
            {
                DayName = DayOfWeek.Monday.ToString(),
                customerId = 10
            },
        new TimeBand()
            {
                DayName = DayOfWeek.Tuesday.ToString(),
                customerId = 11
            }
            .....
    };

我正在使用以下方法将 TimeBands 加载到另一个列表中:

    var timeBandRange = new List<TimeBand>();

    timeBandRange = TimeBandList.Where
                  (p => p.customerId == newCustomerId  
                     && p.DayName == date.DayOfWeek.ToString()).ToList();

这工作正常，但在 TimeBand 类中我决定将 DayName 属性的类型从 string 更改为 DayOfWeek 所以代码变成了这样:

public class TimeBand
{
    public DayOfWeek DayName { get; set; }
    public int customerId { get; set; }
}

var TimeBandList = new List<TimeBand>
    {
        new TimeBand()
            {
                DayName = DayOfWeek.Monday,
                customerId = 10
            },
        new TimeBand()
            {
                DayName = DayOfWeek.Tuesday,
                customerId = 11
            }
            .....
    };

    DateTime date = IndDate;
    var timeBandRange = new List<TimeBand>();

    timeBandRange = TimeBandList.Where
                  (p => p.customerId == parameter.customerId  
                     && p.DayName == date.DayOfWeek).ToList();

此新代码现在在 TimeBandList.Where 行上失败并给出以下错误:System.MissingMethodException:找不到方法:'System.String TimeBand.get_DayName()'。

知道为什么吗？

谢谢

Answer 1

也许你只需要重新编译？我在本地运行此代码并且运行良好。

class Program
{
    static void Main(string[] args)
    {
        TimeBand.DoSomething();
    }
}


public class TimeBand
{
    public DayOfWeek DayName { get; set; }
    public int customerId { get; set; }

    public static void DoSomething()
    {
        var TimeBandList = new List<TimeBand>
            {
                new TimeBand()
                    {
                        DayName = DayOfWeek.Monday,
                        customerId = 10
                    },
                new TimeBand()
                    {
                        DayName = DayOfWeek.Tuesday,
                        customerId = 11
                    }
            };


            DateTime date = DateTime.Now;
            var timeBandRange = new List<TimeBand>();

            timeBandRange = TimeBandList.Where
                          (p => p.customerId == 1  
                             && p.DayName == date.DayOfWeek).ToList();
                }
            }