xaml和wpf中的多绑定图像源(multibind image source in xaml & wpf)

xaml和wpf中的多绑定图像源(multibind image source in xaml & wpf)

在我的项目中，我有一个名为Images的文件夹，其中我在我的应用程序中使用的所有图像都保存在子文件夹中。所有图像都在构建过程中设置为“资源”。

myproject |__Images |__AppImages |__StarOn.png |__StarOff.png

现在，如果我像这样手动设置我的图像：

<Image Source="Images\AppImages\StarOn.png" width="32" height="32"/>

图像正确显示在图像框中。

我想使用转换器和这样的绑定设置图像：

<Image> <Image.Source> <Binding Path="Number" converter="{StaticResource GetImagePathConverter}"/> </Image.Source> </Image>

其中数字是整数

我的转换器是：

public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { int questionNr=int.parse(value.ToString()); if (questionNr>100) { return "Images\\AppImages\\StarOn.png"; } return "Images\\AppImages\\starOff.png"; }

但这不是改变形象？

我做错了什么？ 如何从转换器正确设置图像源？

提前致谢

In my project, i have a folder called Images, where all the images iam using in my application are saved in subfolders.All the images are set to "Resource" in the buildprocess.

myproject |__Images |__AppImages |__StarOn.png |__StarOff.png

Now, if i do set my image manually like this:

<Image Source="Images\AppImages\StarOn.png" width="32" height="32"/>

the image is correctly shown in the imagebox.

i would like to set the image using a converter and a binding like this:

<Image> <Image.Source> <Binding Path="Number" converter="{StaticResource GetImagePathConverter}"/> </Image.Source> </Image>

where the number is an integer

and my converter is:

public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { int questionNr=int.parse(value.ToString()); if (questionNr>100) { return "Images\\AppImages\\StarOn.png"; } return "Images\\AppImages\\starOff.png"; }

but this is not changing the image ?..

what iam doing wrong ? how can i set the image source correctly from the converter ?

thanks in advance

最满意答案

您使用转换器的方式不正确。 您需要创建转换器的实例，通过StaticResource在绑定中使用它。 local:是您需要在xaml中声明的本地命名空间 -

<Image> <Image.Resources> <local:GetImagePathConverter x:Key="GetImagePathConverter"/> </Image.Resources> <Image.Source> <Binding Path="Number" Converter="{StaticResource GetImagePathConverter}"/> </Image.Source> </Image>

此外， Source属性不是字符串类型，而是ImageSource因此您需要转换器中的某些内容 -

public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { int questionNr=int.parse(value.ToString()); if (questionNr>100) { return new BitmapImage(new Uri("Images\\AppImages\\StarOn.png", UriKind.Relative)); } return new BitmapImage(new Uri("Images\\AppImages\\StarOff.png", UriKind.Relative)); }

Your way of using converter is incorrect. You need to create an instance of your converter use it in your binding through StaticResource. local: is the local namespace which you need to declare in your xaml -

<Image> <Image.Resources> <local:GetImagePathConverter x:Key="GetImagePathConverter"/> </Image.Resources> <Image.Source> <Binding Path="Number" Converter="{StaticResource GetImagePathConverter}"/> </Image.Source> </Image>

Also, Source property is not of type string but instead ImageSource so you need something in your converter -

public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { int questionNr=int.parse(value.ToString()); if (questionNr>100) { return new BitmapImage(new Uri("Images\\AppImages\\StarOn.png", UriKind.Relative)); } return new BitmapImage(new Uri("Images\\AppImages\\StarOff.png", UriKind.Relative)); }