只有最后动态创建的图片框才可访问 [英] only last dynamically created picturebox is accessible

问题描述

我正在创建一个 WinForm 应用程序，其中我有 TabControl1 并且在运行时创建 TabPage 和 PictureBox 。



按钮点击，我制作新标签页和 PictureBox 并将它们添加到 TabControl1 。



现在，我可以更改最后创建的 PictureBox 的图像。

当我尝试更改任何<$ c的图像时$ c> PictureBox ，除了最后一个，我无法做到这一点



这是代码示例。



button1 创建新的 TabPage 和 PictureBox 。

  private   void  button1_Click（ object  sender，EventArgs e）
 {
 TabPage tpgallery =  new  TabPage（）; 
 tpgallery.Name =   tpgallery; 
 tpgallery.Text =  图库; 
 
 tabControl1.TabPages.Add（tpgallery）; 
 
 picturebox1 =  new  PictureBox（）; 
 
 picturebox1.Name =   picturebox1name; 
 picturebox1.Image = WindowsFormsApplication7.Properties.Resources.logo1; 
 
 tpgallery.Controls.Add（picturebox1）; 
} 

button2 更改 PictureBox 。

  private   void  button2_Click（ object  sender，EventArgs e）
 {
 picturebox1.Image = WindowsFormsApplication7.Properties.Resources.logo2; 
} 

更正了格式和语法问题。

[/ edit]

解决方案

pictureBox1 保存对最后创建的引用，即问题。

 私人  void  button2_Click（  object  sender，EventArgs e）
 {
 PictureBox pb = tabControl1.SelectedTab.Controls.OfType< picturebox>（）。FirstOrDefault（p = < span class =code-keyword>>  p.Name ==   picturebox1name）; 
 
  if （pb！=  null ）
 pb.Image = WindowsFormsApplication7.Properties.Resources.logo2; 
} 

在此处找到 - 只有最后动态创建的图片框才可访问 [ ^ ]







添加链接文字以反映文章标题。

更正格式和语法问题。

[/编辑] 的

I am creating a WinForm application, in which I have a TabControl1 and at run time created TabPage and PictureBox.

On a Button Click, I make new tab page and PictureBox and add them to the TabControl1.

Now, I can change image of only last created PictureBox.
and when I try to change the image of any PictureBox, except the last one, I am not able to do that

This is the code example.

button1 creates new TabPage and PictureBox.

private void button1_Click(object sender, EventArgs e)
{
    TabPage tpgallery = new TabPage();           
    tpgallery.Name = "tpgallery";
    tpgallery.Text = "  Gallery  ";            
    
    tabControl1.TabPages.Add(tpgallery);           
    
    picturebox1 = new PictureBox();           
    
    picturebox1.Name = "picturebox1name";           
    picturebox1.Image = WindowsFormsApplication7.Properties.Resources.logo1;
    
    tpgallery.Controls.Add(picturebox1);          
}

button2 changes image of PictureBox.

private void button2_Click(object sender, EventArgs e)
{
    picturebox1.Image = WindowsFormsApplication7.Properties.Resources.logo2;
}

[Edit member="Tadit"]
Corrected formatting and grammatical issues.
[/Edit]

解决方案

pictureBox1 holds the reference to the last created one, that's the problem.

private void button2_Click(object sender, EventArgs e)
{
    PictureBox pb = tabControl1.SelectedTab.Controls.OfType<picturebox>().FirstOrDefault(p => p.Name == "picturebox1name");

    if (pb != null)
        pb.Image = WindowsFormsApplication7.Properties.Resources.logo2; 
}

Found Here - only last dynamically created picturebox is accessible[^]


[Edit member="Tadit"]
Link text added to reflect the article title.
Corrected formatting and grammatical issues.
[/Edit]

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