2.10.7

Plain Craft Launcher 2/Controls/MyImage.vb

@@ -25,7 +25,7 @@
 
     ''' <summary>
     ''' 与 Image 的 Source 类似。
-    ''' 若输入以 http 开头的字符串，则会尝试下载图片然后显示，图片会保存为本地缓存。
+    ''' 若输入以 http 开头的字符串，则会尝试下载图片然后显示；若 EnableCache 设为 True，图片还会保存为本地缓存。
     ''' 支持 WebP 格式的图片。
     ''' </summary>
     Public Shadows Property Source As String '覆写 Image 的 Source 属性
@@ -46,7 +46,7 @@
     Sub(sender, e) If sender IsNot Nothing Then CType(sender, MyImage).Source = e.NewValue.ToString())))
 
     ''' <summary>
-    ''' 当 Source 首次下载失败时，会从该备用地址加载图片。
+    ''' 若 Source 是一个网络图片，该地址将作为第二下载源。
     ''' </summary>
     Public Property FallbackSource As String
         Get
@@ -111,74 +111,36 @@
             Return
         End If
         '从缓存加载网络图片
-        Dim Url As String = Source
-        Dim Retried As Boolean = False
-        Dim TempPath As String = GetTempPath(Url)
-        Dim TempFile As New FileInfo(TempPath)
         Dim EnableCache As Boolean = Me.EnableCache
+        Dim TempPath As String = GetTempPath(Source) & If(EnableCache, "", GetUuid()) '不启用缓存时加上随机字符串，避免冲突
+        Dim TempFile As New FileInfo(TempPath)
         If EnableCache AndAlso TempFile.Exists Then
             ActualSource = TempPath
             If (Date.Now - TempFile.LastWriteTime) < FileCacheExpiredTime Then Return '无需刷新缓存
         End If
         RunInNewThread(
         Sub()
-            Dim TempDownloadingPath As String = Nothing
             Try
 RetryStart:
                 '下载
-                ActualSource = LoadingSource '显示加载中图片
-                TempDownloadingPath = TempPath & RandomInteger(0, 10000000)
-                Directory.CreateDirectory(GetPathFromFullPath(TempPath)) '重新实现下载，以避免携带 Header（#5072）
-                Using Client As New Net.WebClient
-                    Client.DownloadFile(Url, TempDownloadingPath)
-                End Using
-                If Url <> Source AndAlso Url <> FallbackSource Then
-                    '已经更换了地址
-                    File.Delete(TempDownloadingPath)
-                ElseIf EnableCache Then
+                ActualSource = LoadingSource '显示加载中的占位图片
+                NetDownloadByLoader(
+                    If(String.IsNullOrEmpty(FallbackSource), {Source}, {Source, FallbackSource}),
+                    TempPath, SimulateBrowserHeaders:=True)
+                If EnableCache Then
                     '保存缓存并显示
-                    If File.Exists(TempPath) Then File.Delete(TempPath)
-                    FileSystem.Rename(TempDownloadingPath, TempPath)
                     RunInUi(Sub() ActualSource = TempPath)
                 Else
                     '直接显示
-                    RunInUiWait(Sub() ActualSource = TempDownloadingPath)
-                    File.Delete(TempDownloadingPath)
+                    RunInUiWait(Sub() ActualSource = TempPath)
+                    File.Delete(TempPath)
                 End If
             Catch ex As Exception
                 Try
                     If TempPath IsNot Nothing Then File.Delete(TempPath)
-                    If TempDownloadingPath IsNot Nothing Then File.Delete(TempDownloadingPath)
                 Catch
                 End Try
-                If Not Retried Then
-                    '更换备用地址
-                    Log(ex, $"下载图片可重试地失败（{Url}）", LogLevel.Developer)
-                    Retried = True
-                    Url = If(FallbackSource, Source)
-                    '空
-                    If Url Is Nothing Then
-                        ActualSource = Nothing
-                        Return
-                    End If
-                    '本地图片
-                    If Not Url.StartsWithF("http") Then
-                        ActualSource = Url
-                        Return
-                    End If
-                    '从缓存加载网络图片
-                    TempPath = GetTempPath(Url)
-                    TempFile = New FileInfo(TempPath)
-                    If EnableCache AndAlso TempFile.Exists() Then
-                        ActualSource = TempPath
-                        If (Date.Now - TempFile.CreationTime) < FileCacheExpiredTime Then Return '无需刷新缓存
-                    End If
-                    '下载
-                    If Source = Url Then Thread.Sleep(1000) '延迟 1s 重试
-                    GoTo RetryStart
-                Else
-                    Log(ex, $"下载图片失败（{Url}）", LogLevel.Hint)
-                End If
+                Log(ex, $"下载图片失败", LogLevel.Hint)
             End Try
         End Sub, "MyImage PicLoader " & GetUuid() & "#", ThreadPriority.BelowNormal)
     End Sub