BitmapImage.IsDownloading 属性

定义

命名空间:

System.Windows.Media.Imaging

程序集:

PresentationCore.dll

获取一个值，该值指示 BitmapImage 是否正在下载内容。

public:
 virtual property bool IsDownloading { bool get(); };

public override bool IsDownloading { get; }

member this.IsDownloading : bool

Public Overrides ReadOnly Property IsDownloading As Boolean

属性值

Boolean

如果 BitmapImage 正在下载内容，则为 true；否则为 false。

示例

下面的代码示例演示如何使用代码检查属性的值 IsDownloading 。 属性的值作为一个 MessageBox String。

// Define a BitmapImage.
Image myImage = new Image();
BitmapImage bi = new BitmapImage();

// Begin initialization.
bi.BeginInit();

// Set properties.
bi.CacheOption = BitmapCacheOption.OnDemand;
bi.CreateOptions = BitmapCreateOptions.DelayCreation;
bi.DecodePixelHeight = 125;
bi.DecodePixelWidth = 125;
bi.Rotation = Rotation.Rotate90;
MessageBox.Show(bi.IsDownloading.ToString());
bi.UriSource = new Uri("smiley.png", UriKind.Relative);

// End initialization.
bi.EndInit();
myImage.Source = bi;
myImage.Stretch = Stretch.None;
myImage.Margin = new Thickness(5);

' Define a BitmapImage.
Dim myImage As New Image()
Dim bi As New BitmapImage()

' Begin initialization.
bi.BeginInit()

' Set properties.
bi.CacheOption = BitmapCacheOption.OnDemand
bi.CreateOptions = BitmapCreateOptions.DelayCreation
bi.DecodePixelHeight = 125
bi.DecodePixelWidth = 125
bi.Rotation = Rotation.Rotate90
MessageBox.Show(bi.IsDownloading.ToString())
bi.UriSource = New Uri("smiley.png", UriKind.Relative)

' End initialization.
bi.EndInit()
myImage.Source = bi
myImage.Stretch = Stretch.None
myImage.Margin = New Thickness(5)