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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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