资源'ImageConverter'无法解析

Question

我是Windows手机和Silverlight开发的新手.在我的学习练习中,我遇到了一个错误,这是我在这篇文章的标题上提到的.

我的主要目标是将图像文件保存并检索到SQLCE数据库,我使用了本教程http://antonswanevelder.com/2011/10/28/writing-an-image-to-sql-ce-linq-to -sql /

但是,我对此代码段有疑问

<Image Source="{Binding ItemImage, Converter={StaticResource ImageConverter}}" Stretch="UniformToFill"/>

我的想法是编译器找不到资源ImageConverter.我真的需要一个帮助.

我的代码是:MainPage.xaml

<phone:PhoneApplicationPage.Resources>
    <DataTemplate x:Key="CallListListBoxItemTemplate">
        <StackPanel Orientation="Vertical">
            <TextBlock Text="{Binding CallName}" Foreground="DarkCyan" FontSize="{StaticResource PhoneFontSizeLarge}"
                       VerticalAlignment="Top" Margin="12,12,0,0"/>
        </StackPanel>
    </DataTemplate>
    <DataTemplate x:Key="PersonalInfoListBoxItemTemplate">
        <Grid >
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="Auto"/>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="Auto"/>
            </Grid.ColumnDefinitions>
            <Image Source="{Binding PersonImage, Converter={StaticResource ImageConverters}}" Stretch="UniformToFill" Name="_personPhoto" />

MainPage.xaml.cs中

public class ImageConverters : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value is byte[])
        {
            MemoryStream ms = new MemoryStream(value as byte[]);
            WriteableBitmap wb = PictureDecoder.DecodeJpeg(ms, 100, 100);
            return wb;
        }
        else
        {
            return null;
        }

    }
    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

Answer 1

让我们考虑您的值转换器位于ProjectName.Converters命名空间中.

在xaml中,您需要添加命名空间:

<phone.PhoneApplicatinPage
        .. all your code here
      xmlns:converters="clr-namespace;ProjectName.Converters"  
      >

并在Resources标签中:

   <phone:PhoneApplicationPage.Resources>
     <converters:ImageConverters x:Key="ImageConverter"/>
      <!- your DataTemplates here-->

和小教程让你在这里更熟悉IValueConverter