如何对日期进行算术运算?

本文介绍了如何对日期进行算术运算?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在使用C#.NET和SQL SERVER制作窗口应用程序.我有两个日期标签.开始日期和结束日期分别带有datetimepicker控件.现在我有第三个标签来计算日期之间的持续时间(差异) .我尝试了以下代码

I am making window application using C#.NET and SQL SERVER.I Have two labels in a form for dates.starting date and ending date with respective datetimepicker control.Now i have third label who computes the duration(difference)between dates.I have tried following code

private void txtduration_MouseClick(object sender, MouseEventArgs e) { int n; if (startingdate.Value > endingdate.Value) { n = Convert.ToInt32(startingdate.Value - endingdate.Value); txtduration.Text = n.ToString(); } else n = Convert.ToInt32(endingdate.Value - startingdate.Value); txtduration.Text = n.ToString(); }

遇到错误 无法投射对象以键入"System.Timespan"以键入System.iconvertible 请就此帮我 提前感谢 问候

getting an error Unable to cast object to type ''System.Timespan'' to type System.iconvertible Please help me regarding this Thanx in advance regards

推荐答案

如果减去两个DateTime数据类型，则结果为TimeSpan.然后，您尝试将其转换为int，这是不可能的.根据您要尝试执行的操作，执行以下操作: If you subtract two DateTime data types, then you get a TimeSpan as a result. You are then trying to convert this into an int, which is not possible. Depending on what you are trying to do you need do do this: int n; if (startingdate.Value > endingdate.Value) { n = (int)(startingdate.Value - endingdate.Value).TotalSeconds; //n = (int)(startingdate.Value - endingdate.Value).TotalMinutes; //n = (int)(startingdate.Value - endingdate.Value).TotalDays; etc txtduration.Text = n.ToString(); } else n = (int)(endingdate.Value - startingdate.Value).TotalSeconds; txtduration.Text = n.ToString();

假设您正在尝试以其中一种格式查找总时长 希望对您有帮助

This assumes you are trying to find the total duration in one of those formats Hope this helps