克隆控件 - C# (Winform) [英] Clone Controls - C# (Winform)

问题描述

可能的重复:
它是可以复制某个控件的所有属性吗?(C#窗口窗体)

我必须创建一些类似于在设计时创建的控件的控件.创建的控件应该与预定义的控件具有相同的属性，或者换句话说，我想复制一个控件.是否有任何一行代码用于此目的?或者我必须通过一行代码设置每个属性?我现在正在做的是:

I have to create some controls similar to a control created as design time. The created control should have same properties as a predefined control, or in other words I want to copy a control. Is there any single line of code for that purpose? or I have to set each property by a line of code? I am doing right now is:

        ListContainer_Category3 = new FlowLayoutPanel();
        ListContainer_Category3.Location = ListContainer_Category1.Location;
        ListContainer_Category3.BackColor = ListContainer_Category1.BackColor;
        ListContainer_Category3.Size = ListContainer_Category1.Size;
        ListContainer_Category3.AutoScroll = ListContainer_Category1.AutoScroll;

推荐答案

一般来说，您可以使用反射将对象的公共属性复制到新实例中.

Generally speaking you can use reflection to copy the public properties of an object to a new instance.

然而，在处理控件时，您需要谨慎.一些属性，如 WindowTarget 只能由框架基础设施使用；所以你需要过滤掉它们.

When dealing with Controls however, you need to be cautious. Some properties, like WindowTarget are meant to be used only by the framework infrastructure; so you need to filter them out.

过滤工作完成后，就可以写出想要的单行了:

After filtering work is done, you can write the desired one-liner:

Button button2 = button1.Clone();

这里有一些代码可以帮助您入门:

Here's a little code to get you started:

public static class ControlExtensions
{
    public static T Clone<T>(this T controlToClone) 
        where T : Control
    {
        PropertyInfo[] controlProperties = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);

        T instance = Activator.CreateInstance<T>();

        foreach (PropertyInfo propInfo in controlProperties)
        {
            if (propInfo.CanWrite)
            {
                if(propInfo.Name != "WindowTarget")
                    propInfo.SetValue(instance, propInfo.GetValue(controlToClone, null), null);
            }
        }

        return instance;
    }
}

当然，你仍然需要调整命名，位置等.也可能处理包含的控件.

Of course, you still need to adjust naming, location etc. Also maybe handle contained controls.

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