2.8.10

2024-11-08 00:43:29 +08:00
parent 47585e5c9d
commit 2a46c9f5ce
54 changed files with 1013 additions and 779 deletions
@@ -12,13 +12,13 @@ Public Module ModBase
 #Region "声明"

    '下列版本信息由更新器自动修改
-    Public Const VersionBaseName As String = "2.8.9" '不含分支前缀的显示用版本名
-    Public Const VersionStandardCode As String = "2.8.9." & VersionBranchCode '标准格式的四段式版本号
+    Public Const VersionBaseName As String = "2.8.10" '不含分支前缀的显示用版本名
+    Public Const VersionStandardCode As String = "2.8.10." & VersionBranchCode '标准格式的四段式版本号
    Public Const CommitHash As String = "" 'Commit Hash，由 GitHub Workflow 自动替换
 #If BETA Then
-    Public Const VersionCode As Integer = 340 'Release
+    Public Const VersionCode As Integer = 342 'Release
 #Else
-    Public Const VersionCode As Integer = 341 'Snapshot
+    Public Const VersionCode As Integer = 343 'Snapshot
 #End If
    '自动生成的版本信息
    Public Const VersionDisplayName As String = VersionBranchName & " " & VersionBaseName
@@ -990,7 +990,7 @@ Public Module ModBase
        End Using
    End Function
    ''' <summary>
-    ''' 弹出选取文件夹对话框并且要求选取文件夹。如果没有选择就返回空字符串。
+    ''' 弹出选取文件夹对话框并且要求选取文件夹，以 \ 结尾。如果没有选择就返回空字符串。
    ''' </summary>
    Public Function SelectFolder(Optional Title As String = "选择文件夹") As String
        Dim folderDialog As New Ookii.Dialogs.Wpf.VistaFolderBrowserDialog With {.ShowNewFolderButton = True, .RootFolder = Environment.SpecialFolder.Desktop, .Description = Title, .UseDescriptionForTitle = True}
@@ -1207,7 +1207,8 @@ Re:
    ''' 尝试根据后缀名判断文件种类并解压文件，支持 gz 与 zip，会尝试将 jar 以 zip 方式解压。
    ''' 会尝试创建，但不会清空目标文件夹。
    ''' </summary>
-    Public Sub ExtractFile(CompressFilePath As String, DestDirectory As String, Optional Encode As Encoding = Nothing)
+    Public Sub ExtractFile(CompressFilePath As String, DestDirectory As String, Optional Encode As Encoding = Nothing,
+                           Optional ProgressIncrementHandler As Action(Of Double) = Nothing)
        Directory.CreateDirectory(DestDirectory)
        If CompressFilePath.EndsWithF(".gz", True) Then
            '以 gz 方式解压
@@ -1223,7 +1224,9 @@ Re:
        Else
            '以 zip 方式解压
            Using Archive = ZipFile.Open(CompressFilePath, ZipArchiveMode.Read, If(Encode, Encoding.GetEncoding("GB18030")))
+                Dim TotalCount As Integer = Archive.Entries.Count
                For Each Entry As ZipArchiveEntry In Archive.Entries
+                    If ProgressIncrementHandler IsNot Nothing Then ProgressIncrementHandler(1 / TotalCount)
                    Dim DestinationPath As String = IO.Path.Combine(DestDirectory, Entry.FullName)
                    If DestinationPath.EndsWithF("\") OrElse DestinationPath.EndsWithF("/") Then
                        Continue For '不创建空文件夹
@@ -1293,13 +1296,16 @@ RetryDir:
    ''' <summary>
    ''' 复制文件夹，失败会抛出异常。
    ''' </summary>
-    Public Sub CopyDirectory(FromPath As String, ToPath As String)
+    Public Sub CopyDirectory(FromPath As String, ToPath As String, Optional ProgressIncrementHandler As Action(Of Double) = Nothing)
        FromPath = FromPath.Replace("/", "\")
        If Not FromPath.EndsWithF("\") Then FromPath &= "\"
        ToPath = ToPath.Replace("/", "\")
        If Not ToPath.EndsWithF("\") Then ToPath &= "\"
-        For Each File In EnumerateFiles(FromPath)
+        Dim AllFiles = EnumerateFiles(FromPath).ToList
+        Dim FileCount As Integer = AllFiles.Count
+        For Each File In AllFiles
            CopyFile(File.FullName, File.FullName.Replace(FromPath, ToPath))
+            If ProgressIncrementHandler IsNot Nothing Then ProgressIncrementHandler(1 / FileCount)
        Next
    End Sub
    ''' <summary>
@@ -1552,10 +1558,10 @@ RetryDir:
    End Function

    ''' <summary>
-    ''' 获取在子字符串之前的部分。
-    ''' 会裁切尽可能多的内容，但如果未找到子字符串则不裁切。
+    ''' 获取在子字符串第一次出现之前的部分，例如对 2024/11/08 拆切 / 会得到 2024。
+    ''' 如果未找到子字符串则不裁切。
    ''' </summary>
-    <Extension> Public Function Before(Str As String, Text As String, Optional IgnoreCase As Boolean = False) As String
+    <Extension> Public Function BeforeFirst(Str As String, Text As String, Optional IgnoreCase As Boolean = False) As String
        Dim Pos As Integer = If(String.IsNullOrEmpty(Text), -1, Str.IndexOfF(Text, IgnoreCase))
        If Pos >= 0 Then
            Return Str.Substring(0, Pos)
@@ -1564,10 +1570,34 @@ RetryDir:
        End If
    End Function
    ''' <summary>
-    ''' 获取在子字符串之后的部分。
-    ''' 会裁切尽可能多的内容，但如果未找到子字符串则不裁切。
+    ''' 获取在子字符串最后一次出现之前的部分，例如对 2024/11/08 拆切 / 会得到 2024/11。
+    ''' 如果未找到子字符串则不裁切。
    ''' </summary>
-    <Extension> Public Function After(Str As String, Text As String, Optional IgnoreCase As Boolean = False) As String
+    <Extension> Public Function BeforeLast(Str As String, Text As String, Optional IgnoreCase As Boolean = False) As String
+        Dim Pos As Integer = If(String.IsNullOrEmpty(Text), -1, Str.LastIndexOfF(Text, IgnoreCase))
+        If Pos >= 0 Then
+            Return Str.Substring(0, Pos)
+        Else
+            Return Str
+        End If
+    End Function
+    ''' <summary>
+    ''' 获取在子字符串第一次出现之后的部分，例如对 2024/11/08 拆切 / 会得到 11/08。
+    ''' 如果未找到子字符串则不裁切。
+    ''' </summary>
+    <Extension> Public Function AfterFirst(Str As String, Text As String, Optional IgnoreCase As Boolean = False) As String
+        Dim Pos As Integer = If(String.IsNullOrEmpty(Text), -1, Str.IndexOfF(Text, IgnoreCase))
+        If Pos >= 0 Then
+            Return Str.Substring(Pos + Text.Length)
+        Else
+            Return Str
+        End If
+    End Function
+    ''' <summary>
+    ''' 获取在子字符串最后一次出现之后的部分，例如对 2024/11/08 拆切 / 会得到 08。
+    ''' 如果未找到子字符串则不裁切。
+    ''' </summary>
+    <Extension> Public Function AfterLast(Str As String, Text As String, Optional IgnoreCase As Boolean = False) As String
        Dim Pos As Integer = If(String.IsNullOrEmpty(Text), -1, Str.LastIndexOfF(Text, IgnoreCase))
        If Pos >= 0 Then
            Return Str.Substring(Pos + Text.Length)
@@ -1576,8 +1606,8 @@ RetryDir:
        End If
    End Function
    ''' <summary>
-    ''' 获取处于两个子字符串之间的部分。
-    ''' 会裁切尽可能多的内容：匹配开始使用 LastIndexOf，匹配结束使用 IndexOf，但如果未找到子字符串则不裁切。
+    ''' 获取处于两个子字符串之间的部分，裁切尽可能多的内容。
+    ''' 如果未找到子字符串则不裁切。
    ''' </summary>
    <Extension> Public Function Between(Str As String, After As String, Before As String, Optional IgnoreCase As Boolean = False) As String
        Dim StartPos As Integer = If(String.IsNullOrEmpty(After), -1, Str.LastIndexOfF(After, IgnoreCase))
@@ -1844,6 +1874,31 @@ RetryDir:

 #Region "系统"

+    ''' <summary>
+    ''' 线程安全的，可以直接使用 For Each 的 List。
+    ''' 在使用 For Each 循环时，列表的结果可能并非最新，但不会抛出异常。
+    ''' </summary>
+    Public Class SafeList(Of T)
+        Inherits SynchronizedCollection(Of T)
+        Public Sub New()
+            MyBase.New()
+        End Sub
+        Public Sub New(Data As IEnumerable(Of T))
+            MyBase.New(New Object, Data)
+        End Sub
+        Public Shared Widening Operator CType(Data As List(Of T)) As SafeList(Of T)
+            Return New SafeList(Of T)(Data)
+        End Operator
+        Public Shared Widening Operator CType(Data As SafeList(Of T)) As List(Of T)
+            Return New List(Of T)(Data)
+        End Operator
+        Public Overloads Function GetEnumerator() As IEnumerator(Of T)
+            SyncLock SyncRoot
+                Return Items.ToList.GetEnumerator()
+            End SyncLock
+        End Function
+    End Class
+
    ''' <summary>
    ''' 可用于临时存放文件的，不含任何特殊字符的文件夹路径，以“\”结尾。
    ''' </summary>
@@ -1866,6 +1921,12 @@ RetryDir:
    Public Class RestartException
        Inherits Exception
    End Class
+    ''' <summary>
+    ''' 指示用户手动取消了操作，或用户已知晓操作被取消的原因。
+    ''' </summary>
+    Public Class CancelledException
+        Inherits Exception
+    End Class

    ''' <summary>
    ''' 当前程序是否拥有管理员权限。
@@ -1983,11 +2044,11 @@ NextElement:
                '12~60 月，“1 年 2 个月”
                GetTimeSpanString = Math.Floor(TotalMonthes / 12) & " 年" & If((TotalMonthes Mod 12) > 0, " " & (TotalMonthes Mod 12) & " 个月", "")
            ElseIf TotalMonthes >= 4 Then
-                '4~11 月，“5 月”
-                GetTimeSpanString = TotalMonthes & " 月"
+                '4~11 月，“5 个月”
+                GetTimeSpanString = TotalMonthes & " 个月"
            ElseIf TotalMonthes >= 1 Then
-                '1~4 月，“2 月 13 天”
-                GetTimeSpanString = TotalMonthes & " 月" & If((Span.Days Mod 30) > 0, " " & (Span.Days Mod 30) & " 天", "")
+                '1~4 月，“2 个月 13 天”
+                GetTimeSpanString = TotalMonthes & " 个月" & If((Span.Days Mod 30) > 0, " " & (Span.Days Mod 30) & " 天", "")
            ElseIf Span.TotalDays >= 4 Then
                '4~30 天，“23 天”
                GetTimeSpanString = Span.Days & " 天"
@@ -2108,7 +2169,7 @@ NextElement:
    ''' <summary>
    ''' 在新的工作线程中执行代码。
    ''' </summary>
-    Public Function RunInNewThread(Action As Action, Name As String, Optional Priority As ThreadPriority = ThreadPriority.Normal) As Thread
+    Public Function RunInNewThread(Action As Action, Optional Name As String = Nothing, Optional Priority As ThreadPriority = ThreadPriority.Normal) As Thread
        Dim th As New Thread(
        Sub()
            Try
@@ -2118,7 +2179,7 @@ NextElement:
            Catch ex As Exception
                Log(ex, Name & "：线程执行失败", LogLevel.Feedback)
            End Try
-        End Sub) With {.Name = Name, .Priority = Priority}
+        End Sub) With {.Name = If(Name, "Runtime New Invoke " & GetUuid() & "#"), .Priority = Priority}
        th.Start()
        Return th
    End Function
@@ -568,7 +568,7 @@ Restart:
    End Class

    '任务栏进度条
-    Public LoaderTaskbar As New SynchronizedCollection(Of LoaderBase)
+    Public LoaderTaskbar As New SafeList(Of LoaderBase)
    Public LoaderTaskbarProgress As Double = 0 '平滑后的进度
    Private LoaderTaskbarProgressLast As Shell.TaskbarItemProgressState = Shell.TaskbarItemProgressState.None

@@ -701,7 +701,7 @@ RequestFinished:
        ''' <summary>
        ''' 所属的文件列表任务。
        ''' </summary>
-        Public Tasks As New SynchronizedCollection(Of LoaderDownload)
+        Public Tasks As New SafeList(Of LoaderDownload)
        ''' <summary>
        ''' 所有下载源。
        ''' </summary>
@@ -974,7 +974,8 @@ Capture:
                    Next
                    '是否禁用多线程，以及规定碎片大小
                    Dim TargetUrl As String = GetSource().Url
-                    If TargetUrl.Contains("pcl2-server") OrElse TargetUrl.Contains("gitcode.net") OrElse TargetUrl.Contains("github.com") OrElse TargetUrl.Contains("modrinth") Then Return Nothing
+                    If TargetUrl.Contains("pcl2-server") OrElse TargetUrl.Contains("mcimirror") OrElse TargetUrl.Contains("github.com") OrElse
+                       TargetUrl.Contains("optifine.net") OrElse TargetUrl.Contains("modrinth") Then Return Nothing
                    '寻找最大碎片
                    'FUTURE: 下载引擎重做，计算下载源平均链接时间和线程下载速度，按最高时间节省来开启多线程
                    Dim FilePieceMax As NetThread = Threads
@@ -1303,7 +1304,7 @@ Wrong:
            If String.IsNullOrEmpty(header) Then Return Nothing
            'attachment; filename="filename.ext"
            If Not header.Contains("filename=") Then Return Nothing
-            Return header.After("filename=").Trim(""""c, " "c).Before(";")
+            Return header.AfterLast("filename=").Trim(""""c, " "c).BeforeFirst(";")
        End Function

        '下载文件的最终收束事件
@@ -1469,8 +1470,7 @@ Retry:
        ''' <summary>
        ''' 需要下载的文件。
        ''' </summary>
-        Public Files As List(Of NetFile)
-        Private ReadOnly FilesLock As New Object
+        Public Files As SafeList(Of NetFile)
        ''' <summary>
        ''' 剩余未完成的文件数。（用于减轻 FilesLock 的占用）
        ''' </summary>
@@ -1483,9 +1483,7 @@ Retry:
        Public Overrides Property Progress As Double
            Get
                If State >= LoadState.Finished Then Return 1
-                SyncLock FilesLock
-                    If Not Files.Any() Then Return 0 '必须返回 0，否则在获取列表的时候会错觉已经下载完了
-                End SyncLock
+                If Not Files.Any() Then Return 0 '必须返回 0，否则在获取列表的时候会错觉已经下载完了
                Return _Progress
            End Get
            Set(value As Double)
@@ -1507,16 +1505,14 @@ Retry:
                    Log("[Download] 由于同加载器中失败次数过多引发强制失败：连续失败了 " & value & " 次", LogLevel.Debug)
                    On Error Resume Next
                    Dim ExList As New List(Of Exception)
-                    SyncLock FilesLock
-                        For Each File In Files
-                            For Each Source In File.Sources
-                                If Source.Ex IsNot Nothing Then
-                                    ExList.Add(Source.Ex)
-                                    If ExList.Count > 10 Then GoTo FinishExCatch
-                                End If
-                            Next
+                    For Each File In Files
+                        For Each Source In File.Sources
+                            If Source.Ex IsNot Nothing Then
+                                ExList.Add(Source.Ex)
+                                If ExList.Count > 10 Then GoTo FinishExCatch
+                            End If
                        Next
-                    End SyncLock
+                    Next
 FinishExCatch:
                    OnFail(ExList)
                End If
@@ -1533,17 +1529,15 @@ FinishExCatch:
            '计算进度
            Dim NewProgress As Double = 0
            Dim TotalProgress As Double = 0
-            SyncLock FilesLock
-                For Each File In Files
-                    If File.IsCopy Then
-                        NewProgress += File.Progress * 0.2
-                        TotalProgress += 0.2
-                    Else
-                        NewProgress += File.Progress
-                        TotalProgress += 1
-                    End If
-                Next
-            End SyncLock
+            For Each File In Files
+                If File.IsCopy Then
+                    NewProgress += File.Progress * 0.2
+                    TotalProgress += 0.2
+                Else
+                    NewProgress += File.Progress
+                    TotalProgress += 1
+                End If
+            Next
            If TotalProgress > 0 Then NewProgress /= TotalProgress
            '刷新进度
            If NewProgress < 1 AndAlso NewProgress > 0 Then NewProgress = 2 * (NewProgress ^ 3) - 3 * (NewProgress ^ 2) + 2 * NewProgress '2x^3-3x^2+2x，模拟开头和结尾更慢的情况
@@ -1552,27 +1546,25 @@ FinishExCatch:

        Public Sub New(Name As String, FileTasks As List(Of NetFile))
            Me.Name = Name
-            Files = FileTasks
+            Files = New SafeList(Of NetFile)(FileTasks)
        End Sub
        Public Overrides Sub Start(Optional Input As Object = Nothing, Optional IsForceRestart As Boolean = False)
-            SyncLock FilesLock
-                If Input IsNot Nothing Then Files = Input
-                '去重
-                Dim ResultArray As New List(Of NetFile)
-                For i = 0 To Files.Count - 1
-                    For ii = i + 1 To Files.Count - 1
-                        If Files(i).LocalPath = Files(ii).LocalPath Then GoTo NextElement
-                    Next
-                    ResultArray.Add(Files(i))
+            If Input IsNot Nothing Then Files = New SafeList(Of NetFile)(Input)
+            '去重
+            Dim ResultArray As New SafeList(Of NetFile)
+            For i = 0 To Files.Count - 1
+                For ii = i + 1 To Files.Count - 1
+                    If Files(i).LocalPath = Files(ii).LocalPath Then GoTo NextElement
+                Next
+                ResultArray.Add(Files(i))
 NextElement:
-                Next i
-                Files = ResultArray
-                '设置剩余文件数
-                SyncLock FileRemainLock
-                    For Each File In Files
-                        If File.State <> NetState.Finish Then FileRemain += 1
-                    Next
-                End SyncLock
+            Next
+            Files = ResultArray
+            '设置剩余文件数
+            SyncLock FileRemainLock
+                For Each File In Files
+                    If File.State <> NetState.Finish Then FileRemain += 1
+                Next
            End SyncLock
            State = LoadState.Loading
            '开始执行
@@ -1615,25 +1607,23 @@ NextElement:
                        Next
                    End If
                    '最多 5 个线程，最少每个线程分配 10 个文件
-                    SyncLock FilesLock
-                        Dim FilesPerThread As Integer = Math.Max(5, Files.Count / 10 + 1)
-                        Dim FilesInThread As New List(Of NetFile)
-                        For Each File In Files
-                            FilesInThread.Add(File)
-                            If FilesInThread.Count = FilesPerThread Then
-                                Dim FilesToRun As New List(Of NetFile)
-                                FilesToRun.AddRange(FilesInThread)
-                                RunInNewThread(Sub() StartCopy(FilesToRun, FoldersFinal), "NetTask FileCopy " & Uuid)
-                                FilesInThread.Clear()
-                            End If
-                        Next
-                        If FilesInThread.Any Then
+                    Dim FilesPerThread As Integer = Math.Max(5, Files.Count / 10 + 1)
+                    Dim FilesInThread As New List(Of NetFile)
+                    For Each File In Files
+                        FilesInThread.Add(File)
+                        If FilesInThread.Count = FilesPerThread Then
                            Dim FilesToRun As New List(Of NetFile)
                            FilesToRun.AddRange(FilesInThread)
                            RunInNewThread(Sub() StartCopy(FilesToRun, FoldersFinal), "NetTask FileCopy " & Uuid)
                            FilesInThread.Clear()
                        End If
-                    End SyncLock
+                    Next
+                    If FilesInThread.Any Then
+                        Dim FilesToRun As New List(Of NetFile)
+                        FilesToRun.AddRange(FilesInThread)
+                        RunInNewThread(Sub() StartCopy(FilesToRun, FoldersFinal), "NetTask FileCopy " & Uuid)
+                        FilesInThread.Clear()
+                    End If
                Catch ex As Exception
                    OnFail(New List(Of Exception) From {ex})
                End Try
@@ -1728,24 +1718,20 @@ Retry:
                Dim UsefulExs = ExList.Where(Function(e) Not e.Message.Contains("(404)")).ToList
                [Error] = If(UsefulExs.Any, UsefulExs(0), ExList(0))
                '获取实际失败的文件
-                SyncLock FilesLock
-                    For Each File In Files
-                        If File.State = NetState.Error Then
-                            [Error] = New Exception("文件下载失败：" & File.LocalPath & vbCrLf & Join(
-                                File.Sources.Select(Function(s) If(s.Ex Is Nothing, s.Url, s.Ex.Message & "（" & s.Url & "）")), vbCrLf), [Error])
-                            Exit For
-                        End If
-                    Next
-                End SyncLock
+                For Each File In Files
+                    If File.State = NetState.Error Then
+                        [Error] = New Exception("文件下载失败：" & File.LocalPath & vbCrLf & Join(
+                            File.Sources.Select(Function(s) If(s.Ex Is Nothing, s.Url, s.Ex.Message & "（" & s.Url & "）")), vbCrLf), [Error])
+                        Exit For
+                    End If
+                Next
                '在设置 Error 对象后再更改为失败，避免 WaitForExit 无法捕获错误
                State = LoadState.Failed
            End SyncLock
            '中断所有文件
-            SyncLock FilesLock
-                For Each TaskFile In Files
-                    If TaskFile.State < NetState.Merge Then TaskFile.State = NetState.Error
-                Next
-            End SyncLock
+            For Each TaskFile In Files
+                If TaskFile.State < NetState.Merge Then TaskFile.State = NetState.Error
+            Next
            '在退出同步锁后再进行日志输出
            Dim ErrOutput As New List(Of String)
            For Each Ex As Exception In ExList
@@ -1760,11 +1746,9 @@ Retry:
            End SyncLock
            Log("[Download] " & Name & " 已取消！")
            '中断所有文件
-            SyncLock FilesLock
-                For Each TaskFile In Files
-                    TaskFile.Abort(Me)
-                Next
-            End SyncLock
+            For Each TaskFile In Files
+                TaskFile.Abort(Me)
+            Next
        End Sub

    End Class
@@ -1786,8 +1770,7 @@ Retry:
        ''' <summary>
        ''' 当前的所有下载任务。
        ''' </summary>
-        Public Tasks As New List(Of LoaderDownload)
-        Private ReadOnly LockTasks As New Object
+        Public Tasks As New SafeList(Of LoaderDownload)

        ''' <summary>
        ''' 已下载完成的大小。
@@ -1860,11 +1843,9 @@ Retry:
                End If
 #End Region
 #Region "刷新下载任务属性"
-                SyncLock LockTasks
-                    For Each Task In Tasks
-                        Task.RefreshStat()
-                    Next
-                End SyncLock
+                For Each Task In Tasks
+                    Task.RefreshStat()
+                Next
 #End Region
            Catch ex As Exception
                Log(ex, "刷新下载公开属性失败")
@@ -2010,9 +1991,7 @@ Retry:
                    Task.Files(i) = File '回设
                Next
            End SyncLock
-            SyncLock LockTasks
-                Tasks.Add(Task)
-            End SyncLock
+            Tasks.Add(Task)
        End Sub

    End Class
@@ -17,15 +17,19 @@ Public Class MyBitmap
    '自动类型转换
    '支持的类：Image，ImageSource，Bitmap，ImageBrush，BitmapSource
    Public Shared Widening Operator CType(Image As System.Drawing.Image) As MyBitmap
+        If Image Is Nothing Then Return Nothing
        Return New MyBitmap(Image)
    End Operator
    Public Shared Widening Operator CType(Image As MyBitmap) As System.Drawing.Image
+        If Image Is Nothing Then Return Nothing
        Return Image.Pic
    End Operator
    Public Shared Widening Operator CType(Image As ImageSource) As MyBitmap
+        If Image Is Nothing Then Return Nothing
        Return New MyBitmap(Image)
    End Operator
    Public Shared Widening Operator CType(Image As MyBitmap) As ImageSource
+        If Image Is Nothing Then Return Nothing
        Dim Bitmap = Image.Pic
        Dim rect = New System.Drawing.Rectangle(0, 0, Bitmap.Width, Bitmap.Height)
        Dim bitmapData = Bitmap.LockBits(rect, ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb)
@@ -37,15 +41,19 @@ Public Class MyBitmap
        End Try
    End Operator
    Public Shared Widening Operator CType(Image As System.Drawing.Bitmap) As MyBitmap
+        If Image Is Nothing Then Return Nothing
        Return New MyBitmap(Image)
    End Operator
    Public Shared Widening Operator CType(Image As MyBitmap) As System.Drawing.Bitmap
+        If Image Is Nothing Then Return Nothing
        Return Image.Pic
    End Operator
    Public Shared Widening Operator CType(Image As ImageBrush) As MyBitmap
+        If Image Is Nothing Then Return Nothing
        Return New MyBitmap(Image)
    End Operator
    Public Shared Widening Operator CType(Image As MyBitmap) As ImageBrush
+        If Image Is Nothing Then Return Nothing
        Return New ImageBrush(New MyBitmap(Image.Pic))
    End Operator