我真的不明白为什么我的缩略图没有显示。 。我正在显示来自Google book api的图片。有人可以帮我解决这个问题。这是相关的代码。
一个混乱：我需要创建一个位图图像并在转换器中将我的uri分配给它？没有用图像源设置字符串会不会有效？ <DataTemplate x:Key="BooksItemTemplate">
<Grid DataContext="{Binding}" Margin="{StaticResource PhoneTouchTargetOverhang}" Background="Transparent">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Button Name="btnAnswer4"> // problem is here
<Image Name="thumbnailimage" Source="{Binding Images}" Width="110" Height="150" VerticalAlignment="Top"/>
</Button>
<StackPanel Grid.Column="1" VerticalAlignment="Top">
<TextBlock Text="{Binding BookTitle}" Style="{StaticResource PhoneTextNormalStyle}" TextWrapping="Wrap" FontFamily="{StaticResource PhoneFontFamilySemiBold}"/>
<TextBlock Text="{Binding Identificationno}" Style="{StaticResource PhoneTextNormalStyle}" TextWrapping="Wrap" FontFamily="{StaticResource PhoneFontFamilySemiLight}"/>
</StackPanel>
</Grid>
</DataTemplate>
<phone:LongListSelector x:Name="bookslist"
Background="Transparent"
ItemTemplate="{StaticResource BooksItemTemplate}"/>
这是我的存储库类
public class BookCategoriesRepository
{
private List<BookCategories> bookcategoriesList = new List<BookCategories>();
public BookCategoriesRepository()
{
bookcategoriesList.Add(new BookCategories() { BookcategoryId = 1, CategoryId = 1, Identificationno = "ASDDDD", BookId = 1, BookTitle = "The power of art", Images = "http://bks1.books.google.com/books?id=mKbrGAAACAAJ&printsec=frontcover&img=1&zoom=5&source=gbs_api" });
bookcategoriesList.Add(new BookCategories() { BookcategoryId = 2, CategoryId = 1, Identificationno = "ASDDDD1", BookId = 2, BookTitle = "Barto ´k, Hungary, and the Renewal of Tradition", Images = "http://bks1.books.google.com/books?id=mKbrGAAACAAJ&printsec=frontcover&img=1&zoom=5&source=gbs_api" });
bookcategoriesList.Add(new BookCategories() { BookcategoryId = 3, CategoryId = 1, Identificationno = "ASDDDD2", BookId = 3, BookTitle = "America Is the Prison", Images = "http://bks0.books.google.com/books?id=a3yRlKxxDtkC&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_api" });
bookcategoriesList.Add(new BookCategories() { BookcategoryId = 4, CategoryId = 1, Identificationno = "ASDDDD3", BookId = 4, BookTitle = "Variations on a Blue Guitar", Images = "http://bks5.books.google.com/books?id=TKKd0TaNInAC&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_api" });
bookcategoriesList.Add(new BookCategories() { BookcategoryId = 5, CategoryId = 1, Identificationno = "ASDDDD4", BookId = 5, BookTitle = "Sponsorship", Images = "http://bks7.books.google.com/books?id=VlON_hK0fVEC&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_api" });
bookcategoriesList.Add(new BookCategories() { BookcategoryId = 6, CategoryId = 1, Identificationno = "ASDDDD5", BookId = 6, BookTitle = "I sensi delle arti", Images = "http://bks7.books.google.com/books?id=P7_pAAAAMAAJ&printsec=frontcover&img=1&zoom=5&source=gbs_api" });
bookcategoriesList.Add(new BookCategories() { BookcategoryId = 7, CategoryId = 1, Identificationno = "ASDDDD6", BookId = 7, BookTitle = "Mahler's Fourth Symphony", Images = "http://bks1.books.google.com/books?id=ybNqORIKIekC&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_api" });
bookcategoriesList.Add(new BookCategories() { BookcategoryId = 8, CategoryId = 1, Identificationno = "ASDDDD7", BookId = 8, BookTitle = "The Commissariat of Enlightenment", Images = "http://bks0.books.google.com/books?id=a3yRlKxxDtkC&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_api" });
bookcategoriesList.Add(new BookCategories() { BookcategoryId = 9, CategoryId = 1, Identificationno = "ASDDDD8", BookId = 9, BookTitle = "Smallest Giant", Images= "http://bks5.books.google.com/books?id=TKKd0TaNInAC&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_api" });
bookcategoriesList.Add(new BookCategories() { BookcategoryId = 10, CategoryId = 1, Identificationno = "ASDDDD9", BookId = 10, BookTitle = "Dame Joan Hammond", Images = "http://bks7.books.google.com/books?id=VlON_hK0fVEC&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_api" });
bookcategoriesList.Add(new BookCategories() { BookcategoryId = 11, CategoryId = 1, Identificationno = "ASDDDD10", BookId = 11, BookTitle = "Star Trek and Philosophy", Images = "http://bks1.books.google.com/books?id=ybNqORIKIekC&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_api" });
bookcategoriesList.Add(new BookCategories() { BookcategoryId = 12, CategoryId = 1, Identificationno = "ASDDDD11", BookId = 12, BookTitle = "Manejo De Conflictos Desde La Sabiduria Del Cine Y Las Canciones", Images = "http://bks0.books.google.com/books?id=a3yRlKxxDtkC&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_api" });
bookcategoriesList.Add(new BookCategories() { BookcategoryId = 13, CategoryId = 2, Identificationno = "ASDDDD12", BookId = 13, BookTitle = "Smallest Giant", Images = "http://bks5.books.google.com/books?id=TKKd0TaNInAC&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_api" });
bookcategoriesList.Add(new BookCategories() { BookcategoryId = 14, CategoryId = 2, Identificationno = "ASDDDD13", BookId = 14, BookTitle = "Afropolis", Images = "http://bks7.books.google.com/books?id=VlON_hK0fVEC&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_api" });
}
public class BookCategories
{
private long _BookcategoryId { get; set; }
public long BookcategoryId
{
get
{
return _BookcategoryId;
}
set
{
_BookcategoryId = value;
}
}
private long _BookId { get; set; }
public long BookId
{
get
{
return _BookId;
}
set
{
_BookId = value;
}
}
private long _CategoryId { get; set; }
public long CategoryId
{
get
{
return _CategoryId;
}
set
{
_CategoryId = value;
}
}
private string _BookTitle { get; set; }
public string BookTitle
{
get
{
return _BookTitle;
}
set
{
_BookTitle = value;
}
}
private string_Image { get; set; }
public string Images
{
get
{
return _Image;
}
set
{
_Image = value;
}
}
private string _Identificationno { get; set; }
public string Identificationno
{
get
{
return _Identificationno;
}
set
{
_Identificationno = value;
}
}
}
这是xaml.cs页面方法
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
base.OnNavigatedTo(e);
string categoryid = string.Empty;
if (NavigationContext.QueryString.TryGetValue("catid", out categoryid))
{
bookcategoriesvm.GetBookcategories(Convert.ToInt64(categoryid));
}
bookslist.ItemsSource = bookcategoriesvm.BooksCategoriesList;
}
答案 0 :(得分：0)
有时它可能是由错误的日期+时间配置引起的。