枚举器性能问题(需要更好的方法) [英] Enumerator Performance Issue (Needs a better method)

问题描述

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推荐答案

基于代码的第一印象:访问UI控件的属性总是很慢.由于您要遍历文件，因此我认为不必将文本等设置为控件，而应使用变量.这也适用于textbox1和... 2.由于文本框2在迭代过程中是静态的"，因此将文本"属性中的值带到字符串变量中，然后在循环中使用它.

另外，由于您在代码中填充了一个列表框，因此请不要随便添加项目，而是将它们收集到一个集合中，然后在循环之后，使用ListBox.ObjectCollection.AddRange方法 [ ^ ]

加法:

我编写的代码很可能是错误的，因为我不了解代码的全部概念，但也许是以下内容:

Based on the first impression of your code: Accessing properties of an UI control is always slow. Since you''re iterating through files , in my opinion you don''t have to set the texts etc to the controls, use variables instead. This also applies to textbox1 and ...2. Since textbox 2 is ''static in during your iteration, take the value from the Text property to a string variable and use that in your loop.

Also since you fill a list box in your code, don''t add the items as you go but gather them into a collection and after the loop, use ListBox.ObjectCollection.AddRange Method[^]

Addition:

Most likely the code I wrote is wrong since I didn''t know the whole idea for the code, but perhaps something like the following:

...
        Dim text1 As String
        Dim text2 As String
        Dim diTop As New System.IO.DirectoryInfo(ComboBox1.SelectedItem)
        Try
            ' Enumerate all subdirectories.
            For Each di In diTop.EnumerateDirectories("*")
                Try
                    ' Enumerate each file in each subdirectory.
                    For Each fi In di.EnumerateFiles("*", System.IO.SearchOption.AllDirectories)
                        text1 = getMd5Hash(fi.FullName)
                        If text2.Contains(text1) Then
                            itemList.Add(fi.FullName)
                        End If
                        Try
                            ' Catch unauthorized access to a file.
                        Catch UnAuthFile As UnauthorizedAccessException
                            Console.WriteLine("UnAuthFile: {0}",
                                                UnAuthFile.Message)
                        End Try
                    Next
                    ListBox2.Items.AddRange(itemList.ToArray())
                    ' Catch unauthorized access to a subdirectory.
                Catch UnAuthSubDir As UnauthorizedAccessException
...

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