如何在运行时禁用阴影? [英] how to disable shadow at runtime?

问题描述

我已经根据我的要求对表单进行了子类化，并使用以下代码启用了阴影，

I have subclassed form for my requirements and enable shadow with below codes,

bool showShadow=true;

public bool ShowShadow
{ 
    get{ return showShadow;}
    set{showShadow= value;}
}

protected override CreateParams CreateParams
{ 
   get
   {                
      CreateParams value = base.CreateParams;
      value.ExStyle |= WindowMessages.WS_EX_TOPMOST;
      if (this.ShowShadow)
         value.ClassStyle |= WindowMessages.CS_DROPSHADOW;
      return value;
   }
}

我已经通过以下代码创建单个实例来显示自定义表单，

I have shown the customized form just by creating single instance through below code,

MyForm myform= new MyForm();
myForm.Visible= true;

并通过 myform.Visible = false; 隐藏它;

and hided it through myform.Visible = false;

并且我禁用了窗体的阴影，但是由于 CreateParams 未使用禁用的阴影更新，因此正在绘制阴影.

and i disables the shadow for the form, but the shadow is drawing since the CreateParams is not updated with disabled shadow.

有谁知道如何在运行时更改 ShowShadow 属性的同时为单个表单实例调用 CreateParams?

Does anyone know, how to invoke CreateParams for a single instance of form while changing the ShowShadow property at runtime?

请帮我解决这个问题.

推荐答案

当值改变时，你必须使用 SetWindowLong P/Invoke.

You will have to P/Invoke with SetWindowLong when the value is changed.

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