带有嵌入式图像的WPF用户控件未显示该图像 [英] WPF User Control with embedded image is not displaying the image

问题描述

我创建了一个名为ImageButton的用户控件.在Generic.xaml中，控件的模板包含一个带有图片的按钮.在后面的代码中，我创建了一个名为Source的DependencyProperty，类型为ImageSource.在模板中 xaml，图片的Source属性是绑定到用户控件的source属性的模板.这是XAML:

I've created a user control called an ImageButton.  In Generic.xaml, the template for the control contans a Button with an Image in it.  In the code behind, I created a DependencyProperty called Source of type ImageSource.  In the Template xaml, the Image's Source property is template bound to the user control's source property.  Here's the XAML:

<Style TargetType="{x:Type local:ImageButton}">
  <Setter Property="Template">
	<Setter.Value>
	  <ControlTemplate TargetType="{x:Type local:ImageButton}">
		<Button Background="{TemplateBinding Background}" 
		  BorderBrush="{TemplateBinding BorderBrush}"
		  BorderThickness="{TemplateBinding BorderThickness}"
		  Clip="{TemplateBinding Clip}" 
		  ClipToBounds="{TemplateBinding ClipToBounds}" 
		  FlowDirection="{TemplateBinding FlowDirection}"
		  Height="{TemplateBinding Height}"
		  HorizontalAlignment="{TemplateBinding HorizontalAlignment}"
		  HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
		  Margin="{TemplateBinding Margin}"
		  MaxHeight="{TemplateBinding MaxHeight}"
		  MaxWidth="{TemplateBinding MaxWidth}"
		  MinHeight="{TemplateBinding MinHeight}"
		  MinWidth="{TemplateBinding MinWidth}"
		  Opacity="{TemplateBinding Opacity}"
		  OpacityMask="{TemplateBinding OpacityMask}"
		  Padding="{TemplateBinding Padding}"
		  SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
		  ToolTip="{TemplateBinding ToolTip}"
		  VerticalAlignment="{TemplateBinding VerticalAlignment}"
		  VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
		  Visibility="{TemplateBinding Visibility}"
		  Width="{TemplateBinding Width}" >
		<Image Name="Image" 
		  HorizontalAlignment="Stretch"
		  SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
		  Source="{TemplateBinding Source}" 
		  Stretch="Uniform" 
		  VerticalAlignment="Stretch" />
		</Button>
	  </ControlTemplate>
	</Setter.Value>
  </Setter>
</Style>

推荐答案

最有可能是您从数据库读取图像的代码遇到了一些问题，因为我已经测试了您的ImageButton控件，并使用以下代码加载了图像

Most probably your code for reading the image from database has some problem, as I have tested your ImageButton control and image get load using following code

BitmapImage   bmp  =  新  BitmapImage (新  ; Uri ( @" C:\ Photos.jpg")))； btn.Source  =  bmp;

BitmapImage bmp = new BitmapImage(new Uri(@"C:\Photos.jpg")); btn.Source = bmp;

尝试像下面的代码一样使用BeginInit和EndInit

Try using BeginInit and EndInit like following code

 

   MemoryStream ms = ReadFromDatabase();
            BitmapImage bmp = new BitmapImage();
            bmp.BeginInit();
            bmp.StreamSource = ms; //ms is memory stream
            bmp.EndInit();
            btn.Source = bmp;

 

如果上述代码不能解决您的问题，请发布您的代码以从数据库读取图像

Post your code to read image from database if above code doesn't solve your problem

 

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