如何在运行时将图像加载到 WPF? [英] How to load image to WPF in runtime?

问题描述

在运行时将图像加载到 WPF 窗口似乎相当复杂.

It seems like it's quite complicated to load an image in runtime to a WPF window.

Image image;
image = new Uri("Bilder/sas.png", UriKind.Relative);
????.Source = new BitmapImage(image);

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:

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:

<Image Height="200" HorizontalAlignment="Left" Margin="12,12,0,0" Name="image1" 
       Stretch="Fill" VerticalAlignment="Top" Width="350" />

很奇怪，因为我看到过 XAML 标签内的图像来源示例.

Wonder because I have seen examples with sorces to the images inside the XAML tags.

我现在正在使用它:

var uri = new Uri("pack://application:,,,/sas.png");
var bitmap = new BitmapImage(uri);
image1.Source = bitmap;

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>

编辑 2:我的问题解决了，这段代码工作正常:

EDIT 2: My issue is solved, this code works fine:

BitmapImage image = new BitmapImage(
    new Uri("pack://application:,,,/Resources/" + company + ".png"));
image2.Source = image;

推荐答案

在 WPF 中，图像通常从 流 或 Uri.

In WPF an image is typically loaded from a Stream or an Uri.

BitmapImage 支持两者，甚至可以将 Uri 作为构造函数参数传递:

BitmapImage supports both and an Uri can even be passed as constructor argument:

var uri = new Uri("http://...");
var bitmap = new BitmapImage(uri);

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:

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:

var path = Path.Combine(Environment.CurrentDirectory, "Bilder", "sas.png");
var uri = new Uri(path);

如果图像文件是程序集资源，则 Uri 必须遵循 打包 Uri 方案:

If the image file is an assembly resource, the Uri must follow the the Pack Uri scheme:

var uri = new Uri("pack://application:,,,/Bilder/sas.png");

在这种情况下，sas.png 的 Visual Studio 构建操作必须是 Resource.

In this case the Visual Studio Build Action for sas.png would have to be Resource.

一旦你创建了一个 BitmapImage 并且还有一个 Image 控件就像在这个 XAML 中

Once you have created a BitmapImage and also have an Image control like in this XAML

<Image Name="image1" />

您只需将 BitmapImage 分配给该 Image 控件的 Source 属性:

you would simply assign the BitmapImage to the Source property of that Image control:

image1.Source = bitmap;

这篇关于如何在运行时将图像加载到 WPF?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！