将IEnumerable<T>转换为Dictionary<int，T>
将IEnumerable<T>转换为Dictionary<int，T>
提问于 2019-01-28 06:41:17
我有一个具有此返回类型的方法：
IEnumerable<T>我想绘制这个方法的地图，并填写一本字典。
预期结果是：Dictionary<int, T>
Dictionary<int, LeaveTypeDto> leaveType = new Dictionary<int, LeaveTypeDto>();
LeaveType.GetList(string.Empty).ToDictionary<int, LeaveTypeDto>();我该怎么做？
注意： GetList返回类型是IEnumerable of LeaveType，一些字段在LeaveTypeDto中映射，而在LeaveType中有一些字段：
"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。
回答 4
Stack Overflow用户
回答已采纳
发布于 2019-01-28 06:44:47
您可以指定要从可枚举项中获取的键或键和值。
如果我有这样的课：
public class MyClass
{
public int Id {get;set;}
public string Name {get;set;}
}我可以编写以下代码来获得一个Dictionary<int, MyClass>
IEnumerable<MyClass> values;
IDictionary<int, MyClass> valueDict = values.ToDictionary(t => t.Id);或者下面的命令来获得一个Dictionary<int, string>
IEnumerable<MyClass> values;
IDictionary<int, string> valueDict = values.ToDictionary(t => t.Id, t => t.Name);Stack Overflow用户
发布于 2019-01-28 12:47:27
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
};
}通过这条线，我的问题解决了。
GetList(string.Empty).ToDictionary(lt => lt.ID, lt => lt.ToDto())Stack Overflow用户
发布于 2019-01-28 06:45:07
那System.Linq呢
GetList(string.Empty).ToDictionary(k => int.Parse(k.ID))注意，如果ID是string，如果它是int，那么前面的示例是有效的。
GetList(string.Empty).ToDictionary(k => k.ID)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/54396746
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