我想在我的 ListView 中显示一张图片,但我不知道该怎么做。
我的 Guest 类有方法 GetGuestImage()
它返回给我一个绝对路径。
当此文件存在时应加载,当不存在时应加载占位符图像。
我如何实现这一点?
<ListView x:Name="listview">
<ListView.View>
<GridView>
<GridViewColumn DisplayMemberBinding="{Binding GetGuestImage()}" Header="Image" />
<GridViewColumn DisplayMemberBinding="{Binding Vorname}" Header="Vorname" />
<GridViewColumn DisplayMemberBinding="{Binding Nachname}" Header="Nachname" />
<GridViewColumn DisplayMemberBinding="{Binding Postleitzahl}" Header="PLZ" />
<GridViewColumn DisplayMemberBinding="{Binding Ort}" Header="Ort" />
<GridViewColumn DisplayMemberBinding="{Binding Land}" Header="Land" />
</GridView>
</ListView.View>
</ListView>
最佳答案
您可以使用 CellTemplate 和值转换器来完成此操作:
<ListView x:Name="listview" xmlns:local="clr-namespace:WpfApplication1">
<ListView.Resources>
<local:ImageConverter x:Key="ImageConverter" />
</ListView.Resources>
<ListView.View>
<GridView>
<GridViewColumn Header="Image">
<GridViewColumn.CellTemplate>
<DataTemplate>
<Image Source="{Binding Path=., Converter={StaticResource ImageConverter}}" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn DisplayMemberBinding="{Binding Vorname}" Header="Vorname" />
<GridViewColumn DisplayMemberBinding="{Binding Nachname}" Header="Nachname" />
<GridViewColumn DisplayMemberBinding="{Binding Postleitzahl}" Header="PLZ" />
<GridViewColumn DisplayMemberBinding="{Binding Ort}" Header="Ort" />
<GridViewColumn DisplayMemberBinding="{Binding Land}" Header="Land" />
</GridView>
</ListView.View>
</ListView>
namespace WpfApplication1
{
public class ImageConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
dynamic dataObject = value;
if (dataObject != null)
{
string path = dataObject.GetGuestImage();
if(System.IO.File.Exists(path))
return new Uri(dataObject.GetGuestImage(), UriKind.RelativeOrAbsolute);
}
return new Uri(@"c:\yourplaceholderimage.png", UriKind.RelativeOrAbsolute);
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
}
虽然您不能直接绑定(bind)到 GetGuestImage() 方法。另一个想法可能是通过数据对象类的 Uri 属性公开路径并绑定(bind)到这个。那么你不需要转换器:
<GridViewColumn Header="Image">
<GridViewColumn.CellTemplate>
<DataTemplate>
<Image Source="{Binding GuestImage}" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
public class YourDataClass
{
public Uri GuestImage
{
get { return new Uri(@"c:\picture.png", UriKind.RelativeOrAbsolute); }
}
//+ the other properties...
}
关于c# - 在 WPF ListView 中显示图像,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42022530/