获得在C＃previous月的第一天和最后一天的日期 [英] Get the previous month's first and last day dates in c#

问题描述

我想不出一个简单的一个或两个内胆的第一天和最后一天将获得previous个月。

我的LINQ ifying的一项调查显示Web应用程序，他们挤在一个新的要求。

本次调查必须包括所有的服务请求为previous一个月。因此，如果在4月15日，我需要所有游行请求ID。

  VAR RequestIds =（来自R在rdc.request
                  其中，r.dteCreated＆GT; = LastMonthsFirstDate和放大器;＆安培;
                  r.dteCreated＆LT; = LastMonthsLastDate
                  选择r.intRequestId）;
 

我只是想不出日期轻松无开关。除非我是盲人，可以俯瞰做它的内部方法。

解决方案

 今天VAR = DateTime.Today;
VAR月=新的日期时间（today.Year，today.Month，1）;
VAR第一= month.AddMonths（-1）;
变种最后= month.AddDays（-1）;
 

在网上他们，如果你真的需要一两行。

I can't think of an easy one or two liner that would get the previous months first day and last day.

I am LINQ-ifying a survey web app, and they squeezed a new requirement in.

The survey must include all of the service requests for the previous month. So if it is April 15th, I need all of Marches request ids.

var RequestIds = (from r in rdc.request 
                  where r.dteCreated >= LastMonthsFirstDate && 
                  r.dteCreated <= LastMonthsLastDate 
                  select r.intRequestId);

I just can't think of the dates easily without a switch. Unless I'm blind and overlooking an internal method of doing it.

解决方案

var today = DateTime.Today;
var month = new DateTime(today.Year, today.Month, 1);       
var first = month.AddMonths(-1);
var last = month.AddDays(-1);

In-line them if you really need one or two lines.

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