如何从另一个表单更改所有表单的背景

Question

 //when button is clicked
 this.BackgroundImage = new Bitmap(@"file_location");

无论如何我可以制作一个 Base class 并更改

的文件位置

 this.BackgroundImage = new Bitmap(@"file_location");

在我之后打开的表格上，根据选择的图像，所有表格将共享相同的背景图像

Answer 1

可能的解决方案：以某个值保存图像的颜色或路径。当打开一些新表单时，将此值作为参数传递到它的构造函数中。在初始化设置 BackgroundImage.

之后

第一种形式：

var backGround = String.Empty;
private void SelectBackGround(){
//some stuff
   backGround = imgPath;
}

protected void btn_click(...){
   var form = new Form2(backGround);
   form.Show();
}

在 Form2 中：

public Form2(string img){
   //init controls
   this.BackgroundImage = new Bitmap(img);
}

像这样...

Answer 2

如果您想在单击按钮后更改应用中所有表单的背景图像，请尝试以下操作：

public class BaseForm: Form
{
  private static Bitmap _skin = new Bitmap(@"default");
  // base Form stores static image which should be set as background for derived forms
  public static Bitmap Skin 
  {
    get { return _skin; }
    set { _skin = value; OnSkinChanged(EventArgs.Empty); }
  }

  // when current image changes, event is raised
  static event EventHandler SkinChanged;

  static void OnSkinChanged(EventArgs e)
  {
    if (SkinChanged!=null)
        SkinChanged(null, e);
  }

  public BaseForm()
  {
     InitializeComponent();

     // all derived forms are subscribed to event of changing background image
     // they update own background image
     BaseForm.SkinChanged += SetSkinHandler;

     // set background when form created
     if (!DesignMode) // do not change in design mode (optional check)
        SetSkin();     
  }

  private void SetSkinHandler(object sender, EventArgs e)
  {
    SetSkin();
  }

  private void SetSkin()
  {
    this.BackgroundImage = BaseForm.Skin;
  }

  protected override void Dispose(bool disposing)
  {
        if (disposing)
        {
            BaseForm.SkinChanged -= SetSkinHandler;
        }
        // default
        if (disposing && (components != null))
        {
            components.Dispose();
        }
        base.Dispose(disposing);
  }
}

在按钮点击处理程序中设置图像（从设置菜单中获取）

private void SkinButtonClick(object sender, EventArgs e)
{
  BaseForm.Skin = new Bitmap(@"file_location");
}

如何从另一个表单更改所有表单的背景

How to change the background on all forms from another form

c#

inheritance

winforms