• 原来Image控件的Source属性是一个ImageSource对象啊!


      <StackPanel>
        <StackPanel.Resources>
          <local:ImageConverter x:Key="cvt_image" />
        </StackPanel.Resources>
        <TextBox x:Name="txtPath" Text="E:\网盘\我的酷盘\MyFolder\MyPhoto\Panda.jpg" />
        <Image Source="{Binding ElementName=txtPath, Path=Text}"/>
        <Image Source="{Binding ElementName=txtPath, Path=Text, Converter={StaticResource cvt_image}}" />
      </StackPanel>

     
    这里只是一个示范,其实是可以将数据库中取出来的二进制数据,直接转换成一个BitmapImage对象返回的:

        public class ImageConverter : IValueConverter
        {
            public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
            {
                return new BitmapImage(new Uri(value.ToString()));
            }
    
            public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
            {
                throw new NotImplementedException();
            }
        }


     

    以前不知道,一直以为只能放一个图片的地址,所以一直不知道怎么把Bitmap对象直接放进去,今天总算知道,他原来是一个ImageSource类型,而继承该类型的class有:BitmapImage (继承自BitmapSource)和DrawingImage(继承自ImageSource)。BitmapImage可以显示一个普通位图,DrawingImage可以显示矢量图。

    。。。XAML真是害人啊!唉,介绍WPF纯代码技术的书实在太少了

  • 相关阅读:
    Leetcode: Word Ladder II
    Leetcode: Triangle
    Leetcode: Best Time to Buy and Sell Stock II
    Leetcode: Best Time to Buy and Sell Stock
    Leetcode: Pascal's Triangle II
    Leetcode: Pascal's Triangle
    Leetcode: Path Sum II
    Leetcode: Convert Sorted Array to Binary Search Tree
    Leetcode: Merge Sorted Array
    Leetcode: Word Search
  • 原文地址:https://www.cnblogs.com/puncha/p/3876998.html
Copyright © 2020-2023  润新知