Code Snippet

這裡作個小小的使用心得整理...

情境一：一般UserControl / Shape物件設定背景圖，例如Rectangle

Dim rect As New Rectangle()
Dim imgbrush As New ImageBrush()
imgbrush.ImageSource = New BitmapImage(New Uri("SomePic.jpg", UriKind.Relative))
rect.Fill = imgbrush

如果你寫得很熟了，然後你的組員也熟悉你的寫法...

rect.Fill = New ImageBrush() With{.ImageSource = New BitmapImage(New Uri("SomePic.jpg",UriKind.Relative))}

兩種寫法單純只是程式寫作上問題，都是一樣的結果，寫程式重點還是要人家看得懂。所以我寫這種東西都會特別跟成員講，我懶得寫那麼多行，給我想辦法習慣我的寫法吧！ 哈哈~

ps.. BitmapImage物件需要import System.Windows.Media.Imaging

(算是)情境二：設定Image物件

這也是初學時會遇到的問題，Image物件設定圖片的屬性是Image.Source，它本身就是一個ImageSource物件了，所以不用再用imagebrush..使用如下

Dim img As New Image()

	img.Source = New BitmapImage(New Uri("SomePic.jpg", UriKind.Relative))

情境三：使用webClient抓取圖片(串流)

webclient OpenReadAsync..

Dim wc As New WebClient()
AddHandler wc.OpenReadCompleted, AddressOf OpenReadCompleted
wc.OpenReadAsync(New Uri("XXXPath/image.jpg", UriKind.Relative))

OpenReadCompleted..

Private Sub OpenReadCompleted(ByVal sender As Object, ByVal e As OpenReadCompletedEventArgs)

	    If IsNothing(e.Error) Then

	        Try

	            Dim bitmap As New System.Windows.Media.Imaging.BitmapImage

	            bitmap.SetSource(e.Result)

	            img.Source = bitmap

	        Catch ex As Exception

	            MessageBox.Show(ex.InnerException.Message)

	        End Try

	    End If

	End Sub

重點就只是用SetSource來設定串流而以...