asp.net - 计算 VB.NET 的天数百分比

Question

如何计算使用 VB.NET 完成的天数百分比？

数据读取器采用project_start和project_finished，存储Date()在 SQL-Server-2012 中。

这是我尝试过的：

Dim StartDate As New Date(datareader("project_start"))
Dim FinishDate As New Date(datareader("project_finish"))
Dim Percentage As Date = Date.FromOADate(StartDate.DayOfYear) / Date.FromOADate(FinishDate.DayOfYear) / 100

但我得到这个错误：

Operator '/' is not defined for types 'Date' and 'Date'.

Answer 1

您需要减去 Dates 并使用 TotalDays 属性。下面的示例代码：

Dim start As DateTime = DateTime.Now.AddDays(-50)
Dim endDate As DateTime = DateTime.Now.AddDays(50)

Dim today As DateTime = DateTime.Now

Dim sumDays = (endDate - start).TotalDays
Dim daysToNow = (today - start).TotalDays

Dim percentage = daysToNow / sumDays * 100

Console.WriteLine(percentage)

Console.ReadLine()