投 IEnumerable<T> 到字典<int,T>

Question

我有一个具有这种返回类型的方法：

IEnumerable<T>

我想映射这个方法并填写一个字典。
预期结果是： Dictionary<int, T>

Dictionary<int, LeaveTypeDto> leaveType = new Dictionary<int, LeaveTypeDto>();
LeaveType.GetList(string.Empty).ToDictionary<int, LeaveTypeDto>();

我怎样才能做到这一点？

注意： GetList返回类型是LeaveType的IEnumerable，部分字段在LeaveTypeDto中映射，部分字段在LeaveType中映射：

"ID,Title,HourlyAvailable,..."

ID 是唯一的，必须在我的字典中用作键，其他字段必须映射到 LeaveTypeDto。

Answer 1

您可以指定要从枚举中获取的键或键和值。

如果我有这样的课程：

public class MyClass
{
    public int Id {get;set;}
    public string Name {get;set;}
}

我可以编写以下内容来获取Dictionary<int, MyClass> ：

IEnumerable<MyClass> values;
IDictionary<int, MyClass> valueDict = values.ToDictionary(t => t.Id);

或以下获取Dictionary<int, string> ：

IEnumerable<MyClass> values;
IDictionary<int, string> valueDict = values.ToDictionary(t => t.Id, t => t.Name);

Answer 2

我在 LeaveType 上定义了一个扩展方法：

public static DTO.LeaveTypeDto ToDto(this DataModel.Timekeeper.LeaveType leaveType)
        {
            return new DTO.LeaveTypeDto
            {
                ID = leaveType.ID,
                Code = leaveType.Code,
                Title = leaveType.Title,
                DailyAvailable = leaveType.DailyAvailable,
                HourlyAvailable = leaveType.HourlyAvailable,
                ShiftBaseAvailable = leaveType.ShiftBaseAvailable,
                PredefinedRemaining = leaveType.PredefinedRemaining,
                Active = leaveType.Active,
                StandardLeaveType = leaveType.StandardLeaveType,
                NotRequestAutomaticaly = leaveType.NotRequestAutomaticaly,
                TemplateFileID = leaveType.TemplateFileID,
                ObligateChooseSubstituteForDailyLeave = leaveType.ObligateChooseSubstituteForDailyLeave,
                ObligateChooseSubstituteForHourlyLeave = leaveType.ObligateChooseSubstituteForHourlyLeave,
                ObligateChooseSubstituteForShiftBaseLeave = leaveType.ObligateChooseSubstituteForShiftBaseLeave,
                ObligateChooseInsertAttachment = leaveType.ObligateChooseInsertAttachment,
                CheckSubstituteLimit = leaveType.CheckSubstituteLimit,
                AbsenceRespiteYearXferLimitDays = leaveType.AbsenceRespiteYearXferLimitDays,
                AbsenceRespiteYearXferMode = leaveType.AbsenceRespiteYearXferMode,
                AbsenceRespiteYearXferValuesSummarize = leaveType.AbsenceRespiteYearXferValuesSummarize,
                DailyRequestRegisterRespite = leaveType.DailyRequestRegisterRespite,
                DayMaxHourlyMinutes = leaveType.DayMaxHourlyMinutes,
                DayWorkMinutes = leaveType.WorkingPeriodMaxHourlyMinutes,
                DecreaseAllOnNXOverflow = leaveType.DecreaseAllOnNXOverflow,
                DecreaseBasedOnMonthWorkingDays = leaveType.DecreaseBasedOnMonthWorkingDays,
                DecreaseDayWorkMinutesOnExtraWorkDays = leaveType.DecreaseDayWorkMinutesOnExtraWorkDays,
                DecreaseOnExtraWorkDays = leaveType.DecreaseOnExtraWorkDays,
                DecreaseOnHolidays = leaveType.DecreaseOnHolidays,
                HourlyInOFFDayAvailable=leaveType.HourlyInOFFDayAvailable,
                YearXferValuesSummarize = leaveType.YearXferValuesSummarize,
                YearXferPercentage=leaveType.YearXferPercentage,
                MaxContinuousDaysLimit = leaveType.MaxContinuousDaysLimit,
                HourlyRequestRegisterRespite = leaveType.HourlyRequestRegisterRespite,
                YearXferMode = leaveType.YearXferMode,
                MonthlyDaysLimit = leaveType.MonthlyDaysLimit,
                MonthlyXMinsLimit = leaveType.MonthlyXMinsLimit,
                YearXferLimitDays = leaveType.YearXferLimitDays,
                YearLimitDays = leaveType.YearLimitDays,
                MonthStorable = leaveType.MonthStorable,
                YearHourlyMinsLimit = leaveType.YearHourlyMinsLimit,
                MonthPreusable = leaveType.MonthPreusable,
                MonthlyNXMinsLimit = leaveType.MonthlyNXMinsLimit,
                MonthMaxHourlyMinutes = leaveType.MonthMaxHourlyMinutes,
                IncreaseAbsenceRespiteRemaining = leaveType.IncreaseAbsenceRespiteRemaining,
                DailyLeaveRequestCountPerMonthForOthers = leaveType.DailyLeaveRequestCountPerMonthForOthers,
                DailyLeaveRequestDurationPerMonthForOthers = leaveType.DailyLeaveRequestDurationPerMonthForOthers,
                ShiftLeaveRequestCountPerMonthForOthers = leaveType.ShiftLeaveRequestCountPerMonthForOthers,
                ShiftLeaveRequestDurationPerMonthForOthers = leaveType.ShiftLeaveRequestDurationPerMonthForOthers,
                HourlyLeaveRequestCountPerMonthForOthers = leaveType.HourlyLeaveRequestCountPerMonthForOthers,
                UseLeaveRequetLimitForOthersPerMonth = leaveType.UseLeaveRequetLimitForOthersPerMonth,
                DailyCountPerMonth = leaveType.DailyCountPerMonth,
                CheckMeritRemainingInUnpayedRequest = leaveType.CheckMeritRemainingInUnpayedRequest,
                DayMinHourlyMinutes = leaveType.DayMinHourlyMinutes,
                FirstPresenceRangeHourlyCountPerMonth = leaveType.FirstPresenceRangeHourlyCountPerMonth,
                FirstPresenceRangeLenght = leaveType.FirstPresenceRangeLenght,
                FirstPresenceRangeMaxHourlyLimit = leaveType.FirstPresenceRangeMaxHourlyLimit,
                FirstPresenceRangeMinHourlyLimit= leaveType.FirstPresenceRangeMinHourlyLimit,
                HourlyCountPerMonth = leaveType.HourlyCountPerMonth,
                HourlyLeaveRequestDurationPerMonthForOthers = leaveType.HourlyLeaveRequestDurationPerMonthForOthers,
                IsMonthMaxHourlyStorableToCurrent = leaveType.IsMonthMaxHourlyStorableToCurrent,
                LastPresenceRangeHourlyCountPerMonth = leaveType.LastPresenceRangeHourlyCountPerMonth,
                LastPresenceRangeLenght = leaveType.LastPresenceRangeLenght,
                LastPresenceRangeMaxHourlyLimit = leaveType.LastPresenceRangeMaxHourlyLimit,
                LastPresenceRangeMinHourlyLimit = leaveType.LastPresenceRangeMinHourlyLimit,
                MiddlePresenceRangeHourlyCountPerMonth = leaveType.MiddlePresenceRangeHourlyCountPerMonth,
                MiddlePresenceRangeMaxHourlyLimit = leaveType.MiddlePresenceRangeMaxHourlyLimit,
                MiddlePresenceRangeMinHourlyLimit = leaveType.MiddlePresenceRangeMinHourlyLimit,
                MonthMaxDailyDays=leaveType.MonthMaxDailyDays,
                MonthMaxHourlyStorable=leaveType.MonthMaxHourlyStorable,
                ShiftBaseCountPerMonth=leaveType.ShiftBaseCountPerMonth,
                SuspendsPersonnelStatus=leaveType.SuspendsPersonnelStatus,
                WorkingPeriodMaxHourlyMinutes=leaveType.WorkingPeriodMaxHourlyMinutes,
                YearXMonthMaxHourlyferLimitHours=leaveType.YearXMonthMaxHourlyferLimitHours,
                YearXMonthMaxHourlyferMode=leaveType.YearXMonthMaxHourlyferMode
            };
        }

并通过这一行我的问题解决了。:)

GetList(string.Empty).ToDictionary(lt => lt.ID, lt => lt.ToDto())

Answer 3

System.Linq怎么样

GetList(string.Empty).ToDictionary(k => int.Parse(k.ID))

请注意，如果ID是string ，则前面的示例有效，如果是int则更简单

GetList(string.Empty).ToDictionary(k => k.ID)

Answer 4

如果 ID 是LeaveTypeDto一部分

var q = GetList(string.Empty).ToDictionary(b => b.ID);

否则使用选择重载获取索引，然后使用ToDictionary()

var q = GetList(string.Empty).Select((element, index) => new { i= index, e = element }).ToDictionary(b => b.i, b => b.e);