从具有不同形式的表单调用方法作为参数？ [英] Calling method from a form with a different form as the argument?

问题描述

我有一个颜色对话框，一个用于设置表单的BackColor，但是我设置它的全局方法不会接受MainForm - 我的其他形式而不是设置表单 - 作为Form的参数方法。



以下是我的按钮代码：

I have a color dialog, one which is used to set the BackColor of the forms, however the global method I made to set it will not accept MainForm -- my other form than the settings form -- as the Form argument for the method.

Below is my code for the button:

private void button1_Click(object sender, EventArgs e)
        {
            AppBackgroundColorDialog.ShowDialog();
            globalvariables.DefaultBackgroundColor = AppBackgroundColorDialog.Color;
            globalvariables.SetBackColor(this);

            //Below is what's in question
            globalvariables.SetBackColor(MainForm);

            /*I also tried what is beneath this comment, which works and makes more
            sense, but results in two MainForm(s). I must also note that it does not
            appear as well as simply changing the color of the already open form 
            would.*/
            Form newmainform = new MainForm();
            globalvariables.SetBackColor(newmainform);
            newmainform.Show();
        }

下面是我的全局变量类的代码和设置表单背景颜色的方法（毫无疑问，你可以毫无疑问）推断）：

Below is the code for my global variables class and the method for setting form background color (as you can undoubtedly infer):

public class globalvariables
    {
        public static Color DefaultBackgroundColor = Color.FromArgb(255, 255, 255);

        public static void SetBackColor(Form form)
        {
            form.BackColor = globalvariables.DefaultBackgroundColor;
        }
    }

我意识到MainForm是一种类型，而不是变量，但我不确定如何处理或如何设置背景颜色而不使用关闭MainForm，然后使用新设置的背景颜色重新打开它。我是否必须在MainForm中调用该方法，或者有没有办法从SettingsForm中执行此操作？



提前谢谢！

I realize MainForm is a type, not a variable, but I'm not sure what to do about that or how to set the background color without using closing MainForm, then reopening it with the newly set background color. Do I have to call the method from within MainForm, or is there a way to do so from SettingsForm?

Thank you in advance!

推荐答案

如果您想影响表单的当前实例，只需传递当前实例：

If you want to affect the current instance of the form, you just pass the current instance:

private void button1_Click(object sender, EventArgs e)
        {
            AppBackgroundColorDialog.ShowDialog();
            globalvariables.DefaultBackgroundColor = AppBackgroundColorDialog.Color;
            globalvariables.SetBackColor(this);
        }

如果您要做的是从设置表单中更改调用设置表单的表单，那么它会更复杂 - 您应该做的是设置表格提高主窗体处理的事件 - 并且改变它自己的颜色（或者将它自己的实例传递给你的SetBackColor方法）。

听起来很复杂，但实际上并非如此：在两种表格之间转移信息，第2部分：儿童到家长 [ ^ ]解释了如何。

If what you are trying to do is alter the form that called the settings form from within the settings form, then it's more complex - and what you should do is have the settings form raise an event which the main form handles - and that changes it's own colour (or passes it's own instance to your SetBackColor method).
That sounds complicated, but it really isn't: Transferring information between two forms, Part 2: Child to Parent[^] explains how.

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