枚举组合，正确的方法-vb.net

Question

我在Vb.net中有一个项目，并在Windows窗体应用程序中使用了dotnet framework 3.5。 我正在使用Emum存储和处理任务，如：

Public Enum TaskStatus
        none = 0
        completed = 2
        executing = 4
        executed = 8
        errors = 16      '' Means task got some error in performing some operations
        uploaded = 32
        incomplete = 64  '' Means Task Was Aborted or Process Stopped in between
End Enum

一种功能是处理任务，另一种功能是检查其完成状态，如下

Private Function Manage()
        Dim ts As TaskStatus = TaskStatus.none
        '' Performing Tasks 
        ts = TaskStatus.executing
        '' Task Performed with Error
        ts = TaskStatus.errors Or TaskStatus.executed
        '' Task Uploading
        ts = ts Or TaskStatus.uploaded
        ts = ts Or TaskStatus.completed
        ts = TaskStatus.none
        CheckStatus(ts)
End Function

 Private Function CheckStatus(ByVal ts As TaskStatus)
    ' Now i Want to check
    If ts And (TaskStatus.uploaded Or TaskStatus.errors) Then
        '' Which one of these(Below) is Correct
    End If
    If ts = (TaskStatus.uploaded Or TaskStatus.errors) Then
        '' Which one of these(Above one) is Correct
    End If
    If ts And TaskStatus.incomplete Then
        '' Is it Correct way to check for incompletion
    End If
    If ts And TaskStatus.completed Then
        '' Task is Completed
        '' Is is correct way to check Task Completed
    End If
End Function

在功能CheckStatus中，我想知道使用enum组合进行操作的正确方法吗？

Answer 1

这是一门可以帮助您提出一些想法的课程。 注意附加枚举值all和Enum的flags属性。

Public Class StatusTask
    <Flags> _
    Public Enum TaskStatus
        none = 0
        completed = 2
        executing = 4
        executed = 8
        errors = 16      '' Means task got some error in performing some operations
        uploaded = 32
        incomplete = 64  '' Means Task Was Aborted or Process Stopped in between
        all = -1
    End Enum

    Public ThisStatus As TaskStatus = TaskStatus.none

    Public Sub SetStatus(aStatus As TaskStatus)
        Me.ThisStatus = aStatus
    End Sub

    Public Sub AddStatus(aStatus As TaskStatus)
        Me.ThisStatus = Me.ThisStatus Or aStatus
    End Sub

    Public Sub ClearStatus(aStatus As TaskStatus)
        Me.ThisStatus = Me.ThisStatus And (aStatus Xor TaskStatus.all)
    End Sub

    Public Function HasStatus(aStatus As TaskStatus) As Boolean
        ''if HasFlag not found use
        ''Return (Me.ThisStatus And aStatus) = aStatus

        Return Me.ThisStatus.HasFlag(aStatus)
    End Function
End Class

和一些用法

    Dim foo As New StatusTask
    'set some status
    foo.SetStatus(StatusTask.TaskStatus.completed)
    foo.AddStatus(StatusTask.TaskStatus.executed)
    foo.AddStatus(StatusTask.TaskStatus.incomplete Or StatusTask.TaskStatus.uploaded)
    Debug.WriteLine(foo.ThisStatus)

    'do some checks
    'single
    If foo.HasStatus(StatusTask.TaskStatus.completed) Then
        Stop
    End If

    'multiple(both must be set)
    If foo.HasStatus(StatusTask.TaskStatus.completed) AndAlso foo.HasStatus(StatusTask.TaskStatus.incomplete) Then
        Stop
    End If
    'multiple(both must be set) alternative
    If foo.HasStatus(StatusTask.TaskStatus.completed Or StatusTask.TaskStatus.executed) Then
        Stop
    End If

    'multiple(either set)
    If foo.HasStatus(StatusTask.TaskStatus.errors) OrElse foo.HasStatus(StatusTask.TaskStatus.incomplete) Then
        Stop
    End If

    'clear status
    foo.ClearStatus(StatusTask.TaskStatus.errors) 'errors not set
    Debug.WriteLine(foo.ThisStatus)
    foo.ClearStatus(StatusTask.TaskStatus.completed Or StatusTask.TaskStatus.uploaded)
    Debug.WriteLine(foo.ThisStatus)
    foo.ClearStatus(StatusTask.TaskStatus.incomplete)
    Debug.WriteLine(foo.ThisStatus)
    foo.ClearStatus(StatusTask.TaskStatus.all)
    Debug.WriteLine(foo.ThisStatus)

Answer 2

我会说您在这里所做的工作是一种非常好的方法，但是如果您想检查使用or正确方法，建议将它们分成不同的if语句。

最重要的是，我还建议彼此之间使用elseif代替普通的if语句，以节省一些时间和资源:)

这是我的方法：

Private Function CheckStatus(ByVal ts As TaskStatus)
' Now i Want to check
If ts = TaskStatus.uploaded Then
    'Uploaded
Elseif ts = TaskStatus.errors Then
    'Error
Elseif ts = TaskStatus.incomplete Then
    'Incomplete
Elseif ts = TaskStatus.completed Then
    ' Task is Completed
End If
End Function

这只是我做事的简要速览，但是如果我看错了什么，请告诉我。