将DayOfWeek指定为变量

问题描述

以下码工作良好：



For i = 0 to totalDays



Dim weekday As DayOfWeek = sdate.AddDays（i）.DayOfWeek

如果工作日<> DayOfWeek.Friday AndAlso工作日<> DayOfWeek.Saturday那么

RqHours + = 1



结束如果

下一页



这里有错误：



Dim daya As string =" Friday" 

Dim dayb As string =" Saturday"



For i = 0 to totalDays



Dim weekday As DayOfWeek = sdate.AddDays（i）.DayOfWeek

如果  工作日<> daya   AndAlso  工作日
<> dayb  然后

RqHours + = 1



结束如果

下一页

The following code working well:

For i = 0 To totalDays

Dim weekday As DayOfWeek = sdate.AddDays(i).DayOfWeek
If weekday <> DayOfWeek.Friday AndAlso weekday <> DayOfWeek.Saturday Then
RqHours += 1

End If
Next

here is got error:

Dim daya As string = "Friday" 
Dim dayb As string= "Saturday"

For i = 0 To totalDays

Dim weekday As DayOfWeek = sdate.AddDays(i).DayOfWeek
If weekday <> daya AndAlso weekday <> dayb Then
RqHours += 1

End If
Next

请告知

推荐答案

DateTime.DayOfWeek是一个枚举：

DateTime.DayOfWeek is an enumeration:

https://msdn.microsoft.com/en-us/library/system.datetime.dayofweek(v = vs.110）.aspx

https://msdn.microsoft.com/en-us/library/system.datetime.dayofweek(v=vs.110).aspx

要将字符串转换为该枚举的其中一个成员，您需要解析它：

To convert the string to one of the members of that enum, you need to parse it:

Option Strict On
Option Explicit On
Option Infer Off

Public Class Form1
    Private Sub Form1_Load(sender As System.Object, _
                           e As System.EventArgs) _
                           Handles MyBase.Load

        Dim daya As String = "Friday"
        Dim dayb As String = "Saturday"

        Dim dowA As DayOfWeek = _
            DirectCast([Enum].Parse(GetType(DayOfWeek), daya), DayOfWeek)

        Dim dowB As DayOfWeek = _
            DirectCast([Enum].Parse(GetType(DayOfWeek), dayb), DayOfWeek)

        Stop

    End Sub
End Class

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