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我已經創建了一個用戶控件只是爲了包含一個圖像,因爲我必須使用Measureoverride和arrangeoverride方法,我不能創建一個子類(圖像被seled)...無論如何,事情是,當我調用this.Image.Measure(SizeIwantto給圖像)圖像的desiredSize字段未設置...任何人都知道爲什麼? 我以前曾經管理方法,布點和它的工作... 這裏是代碼(我已經檢查了所有的其他尺寸和他們都不是0或NaN)UserControl繪圖Silverlight 4
protected override Size MeasureOverride(Size availableSize)
{
//the size that the element wants to have
Size imageDesiredSize = new Size();
imageDesiredSize = availableSize;
//if the current element's size is a pertentage
if ((futureHeight != 0))
{
imageDesiredSize.Height = availableSize.Height * futureHeight/100;
}
if ((futureWidth != 0))
{
imageDesiredSize.Width = availableSize.Width * futureWidth/100;
}
if (widthWrap)
{
imageDesiredSize.Width = ((BitmapImage)this.Source).PixelWidth;
}
if (heightWrap)
{
imageDesiredSize.Height = ((BitmapImage)this.Source).PixelHeight;
}
System.Diagnostics.Debug.WriteLine("imagedesired" + imageDesiredSize);
this.image.Measure(imageDesiredSize);
System.Diagnostics.Debug.WriteLine("desiredsize" + this.image.DesiredSize);
return imageDesiredSize;
}