c# - 单击保存按钮时保存动态控件状态

Question

我有一个小程序，它在加载时生成四个动态按钮flowLayoutPanel1和一个静态保存按钮。

我的目标是保存动态按钮颜色，以便在重新加载或再次打开表单时，动态按钮的颜色会以与保存时相同的状态重新加载。

下面我将包含我的代码，该代码已被注释以演示我的尝试。我正在使用一个xml文件来保存按钮状态并包含一个保存状态的类。但是，如果创建我的按钮以静态保存，我使用的方法可以正常工作。（我只用一个静态按钮尝试过）

接口： 持有状态的类：

  public class MyFormState
    {
        public string ButtonBackColor { get; set; }
    }

表格代码：

 public partial class Form1 : Form
    {
        //Form Member
        MyFormState state = new MyFormState();
        Button btn;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //loading xml file if it exists
            if (File.Exists("config.xml"))
            {
                loadConfig();

            }

            //Genrating dynamic buttons
            //  flowLayoutPanel1.Controls.Clear();
            for (int i = 0; i <= 3; ++i)
            {
                btn = new Button();
                btn.Text = " Equation " + i;

                flowLayoutPanel1.Controls.Add(btn);
                //click event of buttons
                btn.Click += new EventHandler(btn_Click);
            }

           btn.BackColor = System.Drawing.ColorTranslator.FromHtml(state.ButtonBackColor);


        }

        //method to load file
        private void loadConfig()
        {

            XmlSerializer ser = new XmlSerializer(typeof(MyFormState));
            using (FileStream fs = File.OpenRead("config.xml"))
            {
                state = (MyFormState)ser.Deserialize(fs);
            }
        }

        //saving the xml file and the button colors
        private void writeConfig()
        {
            using (StreamWriter sw = new StreamWriter("config.xml"))
            {

                state.ButtonBackColor = System.Drawing.ColorTranslator.ToHtml(btn.BackColor);
                XmlSerializer ser = new XmlSerializer(typeof(MyFormState));
                ser.Serialize(sw, state);
            }
        }
        int count = 0;


        //backcolor change
        void btn_Click(object sender, EventArgs e)
        {
            Button button = sender as Button;

            if (count == 0)
            {
                button.BackColor = Color.Red;
                count++;
            }

            else if (count == 1)
            {
                button.BackColor = Color.Blue;
                count--;
            }
        }

        //save file
        private void btnSave_Click(object sender, EventArgs e)
        {
            writeConfig();
        }



    }

关于我应该改变什么以使其对我有用的任何建议？谢谢

Answer 1

您的代码工作正常，但仅适用于最后一个按钮。您有 4 个按钮，但只有一个MyFormState对象。创建按钮时，您始终使用相同的私有字段btn。MyFormState所以你需要 4 个对象和 4 个按钮的数组。

MyFormState[] states = new MyFormState[4];
Button[] buttons = new Button[4];

private void Form1_Load(object sender, EventArgs e)
{
    if (File.Exists("config.xml"))
    {
        loadConfig();
    }

    for (int i = 0; i < 4; ++i)
    {
        buttons[i] = new Button();
        buttons[i].Text = " Equation " + i;

        flowLayoutPanel1.Controls.Add(buttons[i]);
        buttons[i].Click += new EventHandler(btn_Click);

        if (states[i] != null)
        {
            buttons[i].BackColor = ColorTranslator.FromHtml(states[i].ButtonBackColor);
        }
    }
}

private void loadConfig()
{
    XmlSerializer ser = new XmlSerializer(typeof(MyFormState[]));
    using (FileStream fs = File.OpenRead("config.xml"))
    {
        states = (MyFormState[])ser.Deserialize(fs);
    }
}

private void writeConfig()
{
    for (int i = 0; i < 4; i++)
    {
        if (states[i] == null)
        {
            states[i] = new MyFormState();
        }
        states[i].ButtonBackColor = ColorTranslator.ToHtml(buttons[i].BackColor);
    }

    using (StreamWriter sw = new StreamWriter("config.xml"))
    {
        XmlSerializer ser = new XmlSerializer(typeof(MyFormState[]));
        ser.Serialize(sw, states);
    }
}