C# 如何在运行时将图像加载到 WPF？
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How to load image to WPF in runtime?
提问by 3D-kreativ
It seems like it's quite complicated to load an image in runtime to a WPF window.
在运行时将图像加载到 WPF 窗口似乎非常复杂。
Image image;
image = new Uri("Bilder/sas.png", UriKind.Relative);
????.Source = new BitmapImage(image);
I'm trying this code, but I need some help to get it to work. I get some red lines below the code! I also wonder if I need to add some extra code inside the XAML code or is in enough with this:
我正在尝试此代码，但我需要一些帮助才能使其正常工作。我在代码下方看到了一些红线！我还想知道我是否需要在 XAML 代码中添加一些额外的代码，或者是否足够：
<Image Height="200" HorizontalAlignment="Left" Margin="12,12,0,0" Name="image1"
Stretch="Fill" VerticalAlignment="Top" Width="350" />
Wonder because I have seen examples with sorces to the images inside the XAML tags.
想知道，因为我已经看到了 XAML 标签内的图像的示例。
EDIT:
编辑：
I'm using this now:
我现在正在使用这个：
var uri = new Uri("pack://application:,,,/sas.png");
var bitmap = new BitmapImage(uri);
image1.Source = bitmap;
The XAML:
XAML：
<Grid Width="374">
<Image Height="200" HorizontalAlignment="Left" Margin="12,12,0,0" Name="image1" Stretch="Fill" VerticalAlignment="Top" Width="350" />
<Button Content="Start" Height="23" HorizontalAlignment="Left" Margin="12,226,0,0" Name="btnStart" VerticalAlignment="Top" Width="75" />
<Button Content="Land" Height="23" HorizontalAlignment="Left" Margin="287,226,0,0" Name="btnLand" VerticalAlignment="Top" Width="75" />
<ComboBox Height="23" HorizontalAlignment="Left" Margin="110,226,0,0" Name="cmbChangeRoute" VerticalAlignment="Top" Width="156" />
</Grid>
EDIT 2: My issue is solved, this code works fine:
编辑 2：我的问题解决了，这段代码工作正常：
BitmapImage image = new BitmapImage();
image.BeginInit();
image.UriSource = new Uri("pack://application:,,,/Resources/" + company + ".png");
image.EndInit();
image2.Source = image;
回答by WPF-it
Make sure that your sas.pngis marked as Build Action: Contentand Copy To Output Directory: Copy Alwaysin its Visual Studio Properties...
确保您在其 Visual Studio 中sas.png标记为Build Action: Content和...Copy To Output Directory: Copy AlwaysProperties
I think the C# source code goes like this...
我认为 C# 源代码是这样的......
Image image = new Image();
image.Source = (new ImageSourceConverter()).ConvertFromString("pack://application:,,,/Bilder/sas.png") as ImageSource;
and XAML should be
XAML 应该是
<Image Height="200" HorizontalAlignment="Left" Margin="12,12,0,0"
Name="image1" Stretch="Fill" VerticalAlignment="Top"
Source="../Bilder/sas.png"
Width="350" />
EDIT
编辑
Dynamically I think XAML would provide best way to load Images ...
动态地我认为 XAML 将提供加载图像的最佳方式......
<Image Source="{Binding Converter={StaticResource MyImageSourceConverter}}"
x:Name="MyImage"/>
where image.DataContextis stringpath.
哪里image.DataContext是string路。
MyImage.DataContext = "pack://application:,,,/Bilder/sas.png";
public class MyImageSourceConverter : IValueConverter
{
public object Convert(object value_, Type targetType_,
object parameter_, System.Globalization.CultureInfo culture_)
{
return (new ImageSourceConverter()).ConvertFromString (value.ToString());
}
public object ConvertBack(object value, Type targetType,
object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
Now as you set a different data context, Imagewould be automatically loaded at runtime.
现在，当您设置不同的数据上下文时，Image将在运行时自动加载。
回答by Clemens
In WPF an image is typically loaded from a Streamor an Uri.
BitmapImagesupports both and an Uri can even be passed as constructor argument:
BitmapImage支持两者，甚至可以将 Uri 作为构造函数参数传递：
var uri = new Uri("http://...");
var bitmap = new BitmapImage(uri);
If the image file is located in a local folder, you would have to use a file://Uri. You could create such a Uri from a path like this:
如果图像文件位于本地文件夹中，则必须使用file://Uri。您可以从这样的路径创建这样的 Uri：
var path = Path.Combine(Environment.CurrentDirectory, "Bilder", "sas.png");
var uri = new Uri(path);
If the image file is a resource in an assembly, the Uri must follow the the Pack Urischeme:
如果图像文件是程序集中的资源，则 Uri 必须遵循Pack Uri方案：
var uri = new Uri("pack://application:,,,/Bilder/sas.png");
In this case the Visual Studio Build Action for sas.pngwould have to be Resource.
在这种情况下，Visual Studio Build Actionsas.png必须是Resource.
Once you have created a BitmapImageand also have an Imagecontrol like in this XAML
一旦你创建了一个BitmapImage并且还有一个像这个 XAML 中的Image控件
<Image Name="image1" />
you would simply assign the BitmapImage to the Sourceproperty of that Image control:
您只需将 BitmapImage 分配给该SourceImage 控件的属性：
image1.Source = bitmap;
