chore: Try Catch
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@@ -30,32 +30,36 @@ Public Class MyImage
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Set(value As String)
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If String.IsNullOrEmpty(value) Then Exit Property
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_SourceData = value
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If Not value.StartsWithF("http") Then ' 本地资源直接使用
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MyBase.Source = New MyBitmap(_SourceData)
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Exit Property
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End If
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If _DownloadTask IsNot Nothing AndAlso Not _DownloadTask.IsCompleted Then ' 之前下载任务还在,直接砍了
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_DownloadTask.Dispose()
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End If
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Dim NeedDownload As Boolean = True '是否需要下载/本地是否有有效缓存
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Dim TempFilePath As String = PathTemp & "Cache\MyImage\" & GetHash(_SourceData) & ".png"
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If _UseCache And File.Exists(TempFilePath) And (DateTime.Now - File.GetCreationTime(TempFilePath)) < FileCacheExpiredTime Then NeedDownload = False ' 缓存文件存在且未过期,不需要重下
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If Not NeedDownload Then
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MyBase.Source = New MyBitmap(TempFilePath)
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Exit Property
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End If
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' 异步下载图片
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Dim TaskID = 0
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_DownloadTask = New Task(Sub()
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NetDownload(_SourceData, TempFilePath, True)
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End Sub)
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TaskID = _DownloadTask.Id
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_DownloadTask.Start()
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_DownloadTask.ContinueWith(Sub(t)
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If t.IsCompleted AndAlso t.Id = TaskID Then ' 任务没有被干掉
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MyBase.Source = New MyBitmap(TempFilePath)
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End If
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End Sub, TaskScheduler.FromCurrentSynchronizationContext())
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Try
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If Not value.StartsWithF("http") Then ' 本地资源直接使用
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MyBase.Source = New MyBitmap(_SourceData)
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Exit Property
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End If
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If _DownloadTask IsNot Nothing AndAlso Not _DownloadTask.IsCompleted Then ' 之前下载任务还在,直接砍了
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_DownloadTask.Dispose()
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End If
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Dim NeedDownload As Boolean = True '是否需要下载/本地是否有有效缓存
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Dim TempFilePath As String = PathTemp & "Cache\MyImage\" & GetHash(_SourceData) & ".png"
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If _UseCache And File.Exists(TempFilePath) And (DateTime.Now - File.GetCreationTime(TempFilePath)) < FileCacheExpiredTime Then NeedDownload = False ' 缓存文件存在且未过期,不需要重下
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If Not NeedDownload Then
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MyBase.Source = New MyBitmap(TempFilePath)
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Exit Property
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End If
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' 异步下载图片
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Dim TaskID = 0
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_DownloadTask = New Task(Sub()
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NetDownload(_SourceData, TempFilePath, True)
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End Sub)
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TaskID = _DownloadTask.Id
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_DownloadTask.Start()
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_DownloadTask.ContinueWith(Sub(t)
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If t.IsCompleted AndAlso t.Id = TaskID Then ' 任务没有被干掉
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MyBase.Source = New MyBitmap(TempFilePath)
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End If
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End Sub, TaskScheduler.FromCurrentSynchronizationContext())
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Catch ex As Exception
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Log(ex, "加载图片失败")
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End Try
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End Set
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End Property
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Public Shared Shadows ReadOnly SourceProperty As DependencyProperty = DependencyProperty.Register("Source", GetType(String), GetType(MyImage), New PropertyMetadata(New PropertyChangedCallback(
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