使用打开文件对话框将位图图像加载到Windows窗体中

Question

我需要使用打开文件对话框以窗口形式打开位图图像（我将从驱动器中加载它）。图像应适合图片框。这是我尝试过的一些代码，但出现错误！

 private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog dlg = new OpenFileDialog();

            dlg.Title = "Open Image";
            dlg.Filter = "bmp files (*.bmp)|*.bmp";

            if (dlg.ShowDialog() == DialogResult.OK)
            {                     
            PictureBox PictureBox1 = new PictureBox();                    
                PictureBox1.Image(dlg.FileName);
            }

            dlg.Dispose();
        }

Answer 1

您必须使用从磁盘上的文件加载图像的Bitmap class创建Bitmap的实例。现在编写代码时，您正在尝试使用constructor overload property，就好像它是method。

更改您的代码使其看起来像这样（还利用PictureBox.Image来确保正确处理，而不是手动调用using statement方法）：

using

当然，这不会在表单上的任何地方display图像，因为您创建的图片框控件尚未添加到表单中。您需要使用Dispose将刚创建的新图片框控件添加到窗体的

private void button1_Click(object sender, EventArgs e)
{
    // Wrap the creation of the OpenFileDialog instance in a using statement,
    // rather than manually calling the Dispose method to ensure proper disposal
    using (OpenFileDialog dlg = new OpenFileDialog())
    {
        dlg.Title = "Open Image";
        dlg.Filter = "bmp files (*.bmp)|*.bmp";

        if (dlg.ShowDialog() == DialogResult.OK)
        {
            PictureBox PictureBox1 = new PictureBox();

            // Create a new Bitmap object from the picture file on disk,
            // and assign that to the PictureBox.Image property
            PictureBox1.Image = new Bitmap(dlg.FileName);
        }
    }
}

中。注意此处添加到上述代码中的行：

Controls collection

Answer 2

工作正常。试试这个，

Controls

Answer 3

您应该尝试：

• 以可视化的形式创建图片框（更容易）
• 将图片框的Add method属性设置为Add（如果要填充图像）
• 将图片框的

  private void button1_Click(object sender, EventArgs e)
  {
      using (OpenFileDialog dlg = new OpenFileDialog())
      {
          dlg.Title = "Open Image";
          dlg.Filter = "bmp files (*.bmp)|*.bmp";
  
          if (dlg.ShowDialog() == DialogResult.OK)
          {
              PictureBox PictureBox1 = new PictureBox();
              PictureBox1.Image = new Bitmap(dlg.FileName);
  
              // Add the new control to its parent's controls collection
              this.Controls.Add(PictureBox1);
          }
      }
  }

  设置为

  private void addImageButton_Click(object sender, EventArgs e)
  {
      OpenFileDialog of = new OpenFileDialog();
      //For any other formats
      of.Filter = "Image Files (*.bmp;*.jpg;*.jpeg,*.png)|*.BMP;*.JPG;*.JPEG;*.PNG"; 
      if (of.ShowDialog() == DialogResult.OK)
      {
          pictureBox1.ImageLocation = of.FileName;
  
      }
  }

最后：

Dock

Answer 4

Fill

Answer 5

[您也可以这样尝试，SizeMode

Answer 6

PictureBox.Image是属性，而不是方法。您可以这样设置：

StretchImage

Answer 7

您可以尝试以下操作：

private void button1_Click(object sender, EventArgs e)
{
    OpenFileDialog dlg = new OpenFileDialog();
    dlg.Title = "Open Image";
    dlg.Filter = "bmp files (*.bmp)|*.bmp";
    if (dlg.ShowDialog() == DialogResult.OK)
    {                     
        PictureBox1.Image = Image.FromFile(dlg.Filename);
    }
    dlg.Dispose();
}

Answer 8

很简单。只需添加：

private void button1_Click(object sender, EventArgs e)
{
    OpenFileDialog open = new OpenFileDialog();
    if (open.ShowDialog() == DialogResult.OK)
        pictureBox1.Image = Bitmap.FromFile(open.FileName);
}