如何更改Windows中所有按钮的属性? [英] How to change property of all buttons in windows from?

问题描述

我在 Form1 上有一些按钮.我想将其 FlatStyle 属性设置为 FlatStyle.Popup .我搜索并编写了一些代码，如下所示:

I have some buttons on Form1. I want to set their FlatStyle property to FlatStyle.Popup. I searched and wrote some code as below:

// List<Control> ButtonsList = new List<Control>();
 List<Button> ButtonsList = new List<Button>();
 public Form1()
        {
            InitializeComponent();
            this.Icon = Properties.Resources.autorun;  //Project->Properties->Resources->
            ButtonsList = GetAccessToAllButtons(this).OfType<Button>.ToList(); //*** hot line ***

            foreach(Button btn in ButtonList)
            {
                btn.FlatStyle = FlatStyle.Popup;
            }

        }



 public IEnumerable<Control> GetAccessToAllButtons(Control thisClass)
        {
            List<Control> ControlsList = new List<Control>();
            foreach (Control child in thisClass.Controls)
            {
                ControlsList.AddRange(GetAccessToAllButtons(child));
            }
            ControlsList.Add(thisClass);
            return ControlsList;
        }

但是当我在代码的热线中使用 GetAccessToAllButtons()时，VS会产生此错误:

But when I use GetAccessToAllButtons() in hot line of my code, VS generates this error:

'System.Linq.Queryable.OfType(Query.Linq.IQueryable)'是一个'方法'，在给定的上下文中无效

'System.Linq.Queryable.OfType(Query.Linq.IQueryable)' is a 'method', which is not valid in the given context

我怎么了?

我在此处的参考信息错过了().这是一个可以接受的答案！我可以参考其他情况吗?还是只是一个错字?

My reference at here missed the (). It is an accepted answer! Do we have a different situation at my reference? or it is only a typo?

推荐答案

OfType 是通用方法，您必须将其用作方法.只需将该行替换为以下内容:

OfType is Generic Method and you must use it as a method. Just replace that line to the following:

ButtonsList = GetAccessToAllButtons(this).OfType<Button>().ToList();

我也建议您编写如下方法:

Also I will recommend you to write method as below:

public List<Button> GetAllButtons(Form f)
{
    List<Button> resultList = new List<Button>();
    foreach(Control a in f.Controls)
    {
        if(a is Button)
        {
            resultList.Add((Button)a);
        }
    }
    return resultList;
}

并以这种方式使用它:

var myBtns = GetAllButtons(yourForm);
foreach (var btn in myBtns)
{
    btn.FlatStyle = FlatStyle.Popup;
}

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