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wp———图片切换效果

　　此篇文章主要是记录一下使用XamlReader加载动画时遇到的一些问题。

首先呢，把源码附上

 1 <phone:PhoneApplicationPage
 2     x:Class="PicChangedAnimation.MainPage"
 3     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 4     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 5     xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
 6     xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
 7     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
 8     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
 9     mc:Ignorable="d" 
10     xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit"
11     FontFamily="{StaticResource PhoneFontFamilyNormal}"
12     FontSize="{StaticResource PhoneFontSizeNormal}"
13     Foreground="{StaticResource PhoneForegroundBrush}"
14     SupportedOrientations="Portrait" Orientation="Portrait"
15     shell:SystemTray.IsVisible="True">
16     <!--LayoutRoot 是包含所有页面内容的根网格-->
17     <Grid x:Name="LayoutRoot" Background="Transparent">
18         <Image x:Name="image" Stretch="Fill" Source="/Image/a.jpg" RenderTransformOrigin="0.5,0.5">
19             <Image.RenderTransform>
20                 <CompositeTransform/>
21             </Image.RenderTransform>
22             <toolkit:GestureService.GestureListener>
23                 <toolkit:GestureListener DragCompleted="GestureListener_DragCompleted_1"/>
24             </toolkit:GestureService.GestureListener>
25         </Image>
26         <Image x:Name="image1" Stretch="Fill" Source="/Image/b.jpg" RenderTransformOrigin="0.5,0.5">
27             <Image.RenderTransform>
28                 <CompositeTransform/>
29             </Image.RenderTransform>
30             <toolkit:GestureService.GestureListener>
31                 <toolkit:GestureListener DragCompleted="GestureListener_DragCompleted_2"/>
32             </toolkit:GestureService.GestureListener>
33         </Image>
34     </Grid>
35 
36 </phone:PhoneApplicationPage>

View Code

  1 using System;
  2 using System.Windows;
  3 using System.Windows.Markup;
  4 using System.Windows.Controls;
  5 using Microsoft.Phone.Controls;
  6 using System.Windows.Navigation;
  7 using System.Windows.Media.Animation;
  8 
  9 namespace PicChangedAnimation
 10 {
 11     public partial class MainPage : PhoneApplicationPage
 12     {
 13         // 构造函数
 14         public MainPage()
 15         {
 16             InitializeComponent();
 17         }
 18 
 19 
 20         // ====================================================================================================================
 21         private void GestureListener_DragCompleted_1(object sender, DragCompletedGestureEventArgs e) {
 22             if (e.HorizontalChange < -50 && e.HorizontalVelocity < 0) {
 23                 //LeftSlideStoryboard.Begin();
 24                 string moveLeft = -(LayoutRoot.ActualWidth) + "";
 25                 Storyboard sb = InitLeftSlideStoryboard(moveLeft, image1, image);
 26                 if (sb != null) {
 27                     try { 
 28                         sb.Begin(); 
 29                     } catch (Exception ex) { 
 30                         System.Diagnostics.Debug.WriteLine(ex.Message); 
 31                     }
 32                 }
 33                 e.Handled = true;
 34             } else if (e.HorizontalChange > 50 && e.HorizontalVelocity > 0) {
 35                 string moveLeft = LayoutRoot.ActualWidth + "";
 36                 Storyboard sb = InitLeftSlideStoryboard(moveLeft, image1, image);
 37                 if (sb != null) {
 38                     try { 
 39                         sb.Begin(); 
 40                     } catch (Exception ex) { 
 41                         System.Diagnostics.Debug.WriteLine(ex.Message); 
 42                     }
 43                 }
 44                 e.Handled = true;
 45             }
 46         }
 47 
 48         private void GestureListener_DragCompleted_2(object sender, DragCompletedGestureEventArgs e) {
 49             if (e.HorizontalChange < -50 && e.HorizontalVelocity < 0) {
 50                 //LeftSlideStoryboard.Begin();
 51                 string moveLeft = -(LayoutRoot.ActualWidth) + "";
 52                 Storyboard sb = InitLeftSlideStoryboard(moveLeft, image, image1);
 53                 if (sb != null) {
 54                     try { 
 55                         sb.Begin(); 
 56                     } catch (Exception ex) { 
 57                         System.Diagnostics.Debug.WriteLine(ex.Message); 
 58                     }
 59                 }
 60                 e.Handled = true;
 61             } else if (e.HorizontalChange > 50 && e.HorizontalVelocity > 0) {
 62                 string moveLeft = LayoutRoot.ActualWidth + "";
 63                 Storyboard sb = InitLeftSlideStoryboard(moveLeft, image, image1);
 64                 if (sb != null) {
 65                     try { 
 66                         sb.Begin(); 
 67                     } catch (Exception ex) { 
 68                         System.Diagnostics.Debug.WriteLine(ex.Message); 
 69                     }
 70                 }
 71                 e.Handled = true;
 72             }
 73         }
 74 
 75         // ====================================================================================================================
 76 //        // {0}-{-480}
 77 //        private string LEFT_SLIDE_STORYBOARD =
 78 //            @"<Storyboard x:Name=""LeftSlideStoryboard"" 
 79 //                xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""
 80 //                xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml""
 81 //                xmlns:phone=""clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone""
 82 //                xmlns:shell=""clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone""
 83 //                xmlns:d=""http://schemas.microsoft.com/expression/blend/2008""
 84 //                xmlns:mc=""http://schemas.openxmlformats.org/markup-compatibility/2006""
 85 //                mc:Ignorable=""d"" >
 86 //                <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty=""(UIElement.Opacity)"">
 87 //                    <EasingDoubleKeyFrame KeyTime=""0"" Value=""0""/>
 88 //                    <EasingDoubleKeyFrame KeyTime=""0:0:0.6"" Value=""1""/>
 89 //                </DoubleAnimationUsingKeyFrames>
 90 //                <DoubleAnimation Duration=""0:0:0.6"" To=""0"" Storyboard.TargetProperty=""(UIElement.Opacity)"" d:IsOptimized=""True""/>
 91 //                <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty=""(UIElement.RenderTransform).(CompositeTransform.TranslateX)"">
 92 //                    <EasingDoubleKeyFrame KeyTime=""0:0:0.6"" Value=""{0}""/>
 93 //                    <EasingDoubleKeyFrame KeyTime=""0:0:0.61"" Value=""0""/>
 94 //                </DoubleAnimationUsingKeyFrames>
 95 //            </Storyboard>";
 96         private string LEFT_SLIDE_STORYBOARD =
 97             @"<Storyboard x:Name=""LeftSlideStoryboard"" 
 98                 xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""
 99                 xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml""
100                 xmlns:phone=""clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone""
101                 xmlns:shell=""clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone""
102                 xmlns:d=""http://schemas.microsoft.com/expression/blend/2008""
103                 xmlns:mc=""http://schemas.openxmlformats.org/markup-compatibility/2006""
104                 mc:Ignorable=""d"" >
105                 <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty=""(UIElement.Opacity)"">
106                     <EasingDoubleKeyFrame KeyTime=""0"" Value=""0""/>
107                     <EasingDoubleKeyFrame KeyTime=""0:0:0.01"" Value=""0""/>
108                     <EasingDoubleKeyFrame KeyTime=""0:0:0.6"" Value=""1""/>
109                     <EasingDoubleKeyFrame KeyTime=""0:0:0.61"" Value=""1""/>
110                 </DoubleAnimationUsingKeyFrames>
111                 <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty=""(UIElement.Visibility)"">
112                     <DiscreteObjectKeyFrame KeyTime=""0"">
113                         <DiscreteObjectKeyFrame.Value>
114                             <Visibility>Collapsed</Visibility>
115                         </DiscreteObjectKeyFrame.Value>
116                     </DiscreteObjectKeyFrame>
117                     <DiscreteObjectKeyFrame KeyTime=""0:0:0.01"">
118                         <DiscreteObjectKeyFrame.Value>
119                             <Visibility>Visible</Visibility>
120                         </DiscreteObjectKeyFrame.Value>
121                     </DiscreteObjectKeyFrame>
122                     <DiscreteObjectKeyFrame KeyTime=""0:0:0.6"">
123                         <DiscreteObjectKeyFrame.Value>
124                             <Visibility>Visible</Visibility>
125                         </DiscreteObjectKeyFrame.Value>
126                     </DiscreteObjectKeyFrame>
127                     <DiscreteObjectKeyFrame KeyTime=""0:0:0.61"">
128                         <DiscreteObjectKeyFrame.Value>
129                             <Visibility>Visible</Visibility>
130                         </DiscreteObjectKeyFrame.Value>
131                     </DiscreteObjectKeyFrame>
132                 </ObjectAnimationUsingKeyFrames>
133                 <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty=""(UIElement.Opacity)"">
134                     <EasingDoubleKeyFrame KeyTime=""0"" Value=""1""/>
135                     <EasingDoubleKeyFrame KeyTime=""0:0:0.01"" Value=""1""/>
136                     <EasingDoubleKeyFrame KeyTime=""0:0:0.6"" Value=""0""/>
137                 </DoubleAnimationUsingKeyFrames>
138                 <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty=""(UIElement.Visibility)"">
139                     <DiscreteObjectKeyFrame KeyTime=""0"">
140                         <DiscreteObjectKeyFrame.Value>
141                             <Visibility>Visible</Visibility>
142                         </DiscreteObjectKeyFrame.Value>
143                     </DiscreteObjectKeyFrame>
144                     <DiscreteObjectKeyFrame KeyTime=""0:0:0.01"">
145                         <DiscreteObjectKeyFrame.Value>
146                             <Visibility>Visible</Visibility>
147                         </DiscreteObjectKeyFrame.Value>
148                     </DiscreteObjectKeyFrame>
149                     <DiscreteObjectKeyFrame KeyTime=""0:0:0.6"">
150                         <DiscreteObjectKeyFrame.Value>
151                             <Visibility>Visible</Visibility>
152                         </DiscreteObjectKeyFrame.Value>
153                     </DiscreteObjectKeyFrame>
154                     <DiscreteObjectKeyFrame KeyTime=""0:0:0.61"">
155                         <DiscreteObjectKeyFrame.Value>
156                             <Visibility>Collapsed</Visibility>
157                         </DiscreteObjectKeyFrame.Value>
158                     </DiscreteObjectKeyFrame>
159                 </ObjectAnimationUsingKeyFrames>
160                 <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty=""(UIElement.RenderTransform).(CompositeTransform.TranslateX)"">
161                     <EasingDoubleKeyFrame KeyTime=""0:0:0.6"" Value=""{0}""/>
162                     <EasingDoubleKeyFrame KeyTime=""0:0:0.61"" Value=""0""/>
163                 </DoubleAnimationUsingKeyFrames>
164             </Storyboard>";
165         
166         public Storyboard InitLeftSlideStoryboard(string moveLeft, Image backCtrl, Image frontCtrl) {
167             string displayXaml = string.Format(LEFT_SLIDE_STORYBOARD, moveLeft);
168             Storyboard storyboard = null;
169             try {
170                 storyboard = XamlReader.Load(displayXaml) as Storyboard;
171                 Storyboard.SetTarget(storyboard.Children[0], backCtrl);
172                 Storyboard.SetTarget(storyboard.Children[1], backCtrl);
173                 Storyboard.SetTarget(storyboard.Children[2], frontCtrl);
174                 Storyboard.SetTarget(storyboard.Children[3], frontCtrl);
175                 Storyboard.SetTarget(storyboard.Children[4], frontCtrl);
176             } catch (Exception e) { 
177                 System.Diagnostics.Debug.WriteLine(e.Message); 
178             }
179             return storyboard;
180         }
181 
182     }
183 }

View Code

然后呢，说下遇到的问题：
1、“System.Windows.Markup.XamlParseException”类型的第一次机会异常在 System.Windows.ni.dll 中发生undeclared prefix [Line: 1 Position: 42]

　　问题出在，加载xaml语句时，存在没有声明就使用的类型前缀

　　我们添加上下面的引用就可以了

1 xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""
2 xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml""
3 xmlns:phone=""clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone""
4 xmlns:shell=""clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone""
5 xmlns:d=""http://schemas.microsoft.com/expression/blend/2008""
6 xmlns:mc=""http://schemas.openxmlformats.org/markup-compatibility/2006""
7 mc:Ignorable=""d""

2、“System.InvalidOperationException”类型的第一次机会异常在 System.Windows.ni.dll 中发生Animation target not specified.
　　

　　问题出在，没有指定动画的目标控件，但即使我们在xaml中指定了，但一样会出现这样的问题，原因在上面的xaml中没有控件的声明。

　　解决方法可以采用c#代码中指定，如下

1 storyboard = XamlReader.Load(displayXaml) as Storyboard;
2 Storyboard.SetTarget(storyboard.Children[0], backCtrl);
3 Storyboard.SetTarget(storyboard.Children[1], backCtrl);
4 Storyboard.SetTarget(storyboard.Children[2], frontCtrl);
5 Storyboard.SetTarget(storyboard.Children[3], frontCtrl);
6 Storyboard.SetTarget(storyboard.Children[4], frontCtrl);

源码下载

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原文地址：https://www.cnblogs.com/qq278360339/p/3210070.html