我有以下代码搜索DataGridView表中的文件夹目录,并将所需格式的所有文件放入列表中,它还会收集上次修改日期的列表,以便以后在应用程序中使用。
代码有效,但眼睛疼痛。我想整理以下循环以提高效率 - 我的意思是我在For循环中有一个For循环,它创建了文件名列表,然后我有两个单独的Do Until循环,从头到尾搜索列表挑出需要调整的文件名。
我非常有兴趣学习一种更好的方法来实现相同的结果,因为我对编码效率的了解非常重要。基本上,这可以在一个或两个循环中完成,因为循环遍历列表两次的想法似乎效率低下了吗?
Public Class
Private Sub btnDirectory_Click(sender As Object, e As EventArgs) Handles btnDirectory.Click
Dim FileNames As New List(Of String)
Dim FileDates As New List(Of Date)
Dim DocNo As String
Dim rowCheck As String
Dim ProjectNo As String = "1111"
Dim FileNameCheck As String
Dim str As String
Dim k As Integer = 0
Dim i As Integer
Dim j As Integer
Dim CorrectType As Boolean = False
'The first loop grabs all files of the wanted format from a datagridview table containing all directories to be checked
For Each rw In Background.Table1.Rows
rowCheck = Background.Table1(0, k).Value
If Not String.IsNullOrEmpty(rowCheck) Then
For Each file As String In My.Computer.FileSystem.GetFiles(Background.Table1(0, k).Value)
CorrectType = False
FileNameCheck = IO.Path.GetFileNameWithoutExtension(file)
If FileNameCheck.Contains(ProjectNo) AndAlso FileNameCheck.Contains("-") AndAlso Not String.IsNullOrEmpty(FileNameCheck) AndAlso FileNameCheck.Contains(" ") Then
DocNo = FileNameCheck.Substring(0, FileNameCheck.IndexOf(" "))
If FileNameCheck.Substring(0, FileNameCheck.IndexOf("-")) = ProjectNo AndAlso CountLetters(DocNo) = 3 Then
CorrectType = True
End If
End If
If CorrectType = True Then
FileNames.Add(FileNameCheck)
FileDates.Add(IO.File.GetLastWriteTime(file))
End If
Next
End If
k += 1
Next
'The next loop tidies up the file formats that contain a "-00-" in their names
j = FileNames.Count
i = 0
Do
str = FileNames(i)
If str.Contains("-00-") Then
FileNames(i) = RemoveChar(str, "-00-") ' RemoveChar is a function that replaces "-00-" with a "-"
End If
i += 1
Loop Until i = j
i = 0
j = FileNames.Count
'Finally, this loop checks that no two files have the exact same name, and gets rid of one of them if that is the case
Do
Dim st1 As String = FileNames(j - 1)
Dim st2 As String = FileNames(j - 2)
If st1 = st2 Then
FileNames.RemoveAt(j - 1)
FileDates.RemoveAt(j - 1)
End If
j -= 1
Loop Until j = 1
End Sub
End Class
答案 0 :(得分:1)
代码肯定很难看。
For Each rw
循环不使用rw
。您可以使用以下循环替换它:
For k = 1 to Background.Table1.Rows.Count
' Do things here
Next k
您指定了rowCheck
并使用了一次,但您错过了在For Each file
行重复使用它的机会。
如果您拥有CorrectType = True
,则可以轻松放置相应的代码。
If FileNameCheck.Substring(0, FileNameCheck.IndexOf("-")) = ProjectNo AndAlso CountLetters(DocNo) = 3 Then
CorrectType = True
End If
End If
If CorrectType = True Then
FileNames.Add(FileNameCheck)
FileDates.Add(IO.File.GetLastWriteTime(file))
End If
变为:
If FileNameCheck.Substring(0, FileNameCheck.IndexOf("-")) = ProjectNo AndAlso CountLetters(DocNo) = 3 Then
FileNames.Add(FileNameCheck)
FileDates.Add(IO.File.GetLastWriteTime(file))
End If
我必须承认,接下来的两个循环使我的眼睛流血(比喻,而不是字面意思)。
j = FileNames.Count
i = 0
Do
str = FileNames(i)
If str.Contains("-00-") Then
FileNames(i) = RemoveChar(str, "-00-") ' RemoveChar is a function that replaces "-00-" with a "-"
End If
i += 1
Loop Until i = j
变为
for i = 1 to FileNames.Count
str = FileNames(i)
If str.Contains("-00-") Then
FileNames(i) = RemoveChar(str, "-00-") ' RemoveChar is a function that replaces "-00-" with a "-"
End If
Next I
和
i = 0
j = FileNames.Count
'Finally, this loop checks that no two files have the exact same name, and gets rid of one of them if that is the case
Do
Dim st1 As String = FileNames(j - 1)
Dim st2 As String = FileNames(j - 2)
If st1 = st2 Then
FileNames.RemoveAt(j - 1)
FileDates.RemoveAt(j - 1)
End If
j -= 1
Loop Until j = 1
变为
'Finally, this loop checks that no two files have the exact same name, and gets rid of one of them if that is the case
For j = FileNames.Count - 1 to 1 Step -1 ' Check my counting here - stop at 1, 2 or 0?
Dim st1 As String = FileNames(j)
Dim st2 As String = FileNames(j - 1)
If st1 = st2 Then
FileNames.RemoveAt(j)
FileDates.RemoveAt(j)
End If
Next j