图片不会改变WPF控件 [英] Picture not changing in WPF control

问题描述

我提到这个，写了几乎相同的代码但是在不同的语言中，它没有按预期工作！

我使用winform（C ++ / Cli）作为主机& 'WPF用户控件Libaray'（C＃）作为子控件。

使用Winform中的ElementHost组件在winforms中集成WPF用户控件（PictureBox）。

基本上我想改变WPF控件中的图片来自winform按钮。它编译和编译运行正常。

但唯一的问题是，即使图片的路径正确，图像也不会改变。



代码以下是winform button_click事件

  private ：System :: Void button1_Click（System ::  Object  ^ sender，System :: EventArgs ^ e）{
 OpenFileDialog ^ ofd =  gcnew  OpenFileDialog（）; 
 WpfControlLibrary1 :: UserControl1 ^ uc =  gcnew  UserControl1（）; 
  if （ofd-> ShowDialog（）== Windows :: Forms :: DialogResult :: OK）
 uc-> open（ ofd->文件名）; 
} 

以下代码位于UserControl1.xaml.cs

  public   void  open（ string  path）
 {
 MessageBox.Show（path）;  //  路径似乎很好 
 img.Source =  new  BitmapImage（ new  Uri（path））; 
} 

以下代码位于UserControl1.xaml

 <   UserControl     x：类  =  WpfControlLibrary1.UserControl1  
   
                             xmlns   =  http://schemas.microsoft.com/winfx/2006/xaml/presentation  
   
                             xmlns：x   =  http://schemas.microsoft .com / winfx / 2006 / xaml  
   
  < span class =code-attribute>                           xmlns：mc   =  http://schemas.openxmlformats.org/markup -compatibility / 2006    
   
                             xmlns：d   =  http://schemas.microsoft.com/expression/blend/2008    
   
                    < span class =code-attribute>         mc：可忽略  =  d    
   
                             d：DesignHeight   =  300    d：DesignWidth   =  300 >  
 <  网格   保证金  =   -  54,0,0,0 >  
 <  图片    x：名称  =  img     拉伸 < span class =code-keyword> = 统一   不透明度  =  1   来源  = 考拉。 jpg  /  >  
 <   / Grid  >  
 <   / UserControl  >  

我尝试了什么：



尝试删除xaml代码中的源图像，它没有效果

解决方案

图像的加载不是那么简单。看看这个文档或其他示例代码

i referred this, wrote almost same code but in different langauge, its not working as expected!
i'm using winform(C++/Cli) as host & 'WPF User Control Libaray'(C#) as a child control.
integrated WPF user control(PictureBox) in winforms using ElementHost component in Winform.
Basically i wanted to change picture in WPF control from winform button. It compiles & runs fine.
But the only issue is that image is not changing even if the path for picture is proper.

below code is in winform button_click Event

private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
    OpenFileDialog ^ofd = gcnew OpenFileDialog();
    WpfControlLibrary1::UserControl1 ^uc = gcnew UserControl1();
    if (ofd->ShowDialog() == Windows::Forms::DialogResult::OK)      
    uc->open(ofd->FileName);        
}

Below code is in UserControl1.xaml.cs

public void open(string path)
{
    MessageBox.Show(path); //path seems to be fine
    img.Source = new BitmapImage(new Uri(path));
}

Below code is in UserControl1.xaml

<UserControl x:Class="WpfControlLibrary1.UserControl1"

             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 

             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 

             mc:Ignorable="d" 

             d:DesignHeight="300" d:DesignWidth="300">
    <Grid Margin="-54,0,0,0">
        <Image x:Name="img"  Stretch="Uniform" Opacity="1" Source="Koala.jpg"/>
    </Grid>
</UserControl>

What I have tried:

tried removing Source image in xaml code, it made no effect

解决方案

The loading of an image isnt so short handed. Take a look at this documentation or other example code.

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