c# - 我怎样才能让一个类在表单内创建一个 PictureBox 对象

Question

我正在尝试创建一个 MainCharacter 类，其工作是根据通过房间传递的一些参数在“房间”对象内创建一个 PictureBox每次加载时。

这是MainCharacter类的代码:

namespace VirtualMuseum
{
    class MainCharacter
    {
        string characterName;
        int characterGender;
        bool registeredUser;
        int[] playerPosition;


        // Character constructor
        public MainCharacter(string name, int gender, bool registered, int[] location)
        {
            characterName = name;
            characterGender = gender;
            registeredUser = registered;
            playerPosition = location;
        }

        public void drawCharacter()
        {
            PictureBox playerBox = new PictureBox();
            playerBox.Image = Properties.Resources.mc___main_characters_sprites_by_ssb_fan4ever_d53kkhx;
            playerBox.Width = 28;
            playerBox.Height = 32;
            playerBox.Location = new Point(playerPosition[0], playerPosition[1]);
            playerBox.Visible = true;    
        }
    }
}

例如，在 room1 内创建玩家对象的代码行

MainCharacter player1 = new MainCharacter(playerName, playerGender, registeredUser, playerPosition);

问题是，当进入创建播放器对象的特定房间时，表单内看不到 PictureBox。

-----新 Action -----

按照您的指示，在 Room 类中使用以下代码

public Hall()
    {
        playerPosition = new int[] { 350, 400 };

        InitializeComponent();
        //pictureBox2.Parent = pictureBox1;
        MessageBox.Show(playerPosition.ToString());

        MainCharacter player1 = new MainCharacter(playerName, playerGender, registeredUser, playerPosition);

        player1.drawCharacter(this);
}

MainCharacter 类中的以下代码:

public void drawCharacter(Form form)
    {
        PictureBox playerBox = new PictureBox();
        playerBox.Image = Properties.Resources.mc___main_characters_sprites_by_ssb_fan4ever_d53kkhx;
        playerBox.Width = 28;
        playerBox.Height = 32;
        playerBox.Location = new Point(playerPosition[0], playerPosition[1]);

        // Add the pictureBox to the selected form
        form.Controls.Add(playerBox);
}

尽管我在drawCharacter方法中定义了图片框的大小，但我设法在表单内绘制了一些东西，但它看起来像一条非常小的线。

Answer 1

选项1
拥有表单的实例后，请在drawCharacter末尾添加以下代码:

formInstance.Controls.Add(playerBox);

例如:

public void drawCharacter(Form formInstance)
{
    PictureBox playerBox = new PictureBox();
    // Set properties ...

    formInstance.Controls.Add(playerBox);
}

然后在您的表单中，当您需要调用此方法时使用:

 var player1 = new MainCharacter(playerName, playerGender, registeredUser, playerPosition);
 player1.drawCharacter(this);

选项2
您可以更改方法以返回 PictureBox:

public PictureBox drawCharacter()
{
    PictureBox playerBox = new PictureBox();
    // Set properties ...

    return  playerBox;
}

然后在您的表单中，当您需要调用此方法时使用:

var player1 = new MainCharacter(playerName, playerGender, registeredUser, playerPosition);
this.Controls.Add(player1.drawCharacter());

要点:

• 正如“Ivan Stoev”的评论中提到的，所有控件都必须添加到表单的 Controls 集合中。
• 不要忘记将位置属性设置为合适的位置或更好的选项，使用 FlowLayoutPanel 并将 PictureBox 添加到其中。例如，如果您在 (flowLayoutPanel1) 上放置 FlowLayoutPabel，则可以使用选项 2 并以这种方式向其添加图片框

使用 FlowLayoutPanel 的代码:

var player1 = new MainCharacter(playerName, playerGender, registeredUser, playerPosition);
this.flowLayoutPanel1.Controls.Add(player1.drawCharacter());