Question

我有2个winforms，我想在它们之间传递数据。

表格1只不过是一个大型的图片框。

Form2在表单1的顶部始终保持打开状态。它作为半透明控件使用“退出”按钮，我添加了一个轨迹栏。退出按钮工作正常，但是如果值发生变化，我无法读取跟踪栏的值。

我想要发生的是，如果轨迹栏的值发生变化，它会将值发送到第一个表单并触发事件。

我在哪里错了？

Form1

    public sbyte value
    {
        get { return Exitform.myValue; }
    }

    public Fullscreenpreview(string filename)
    {
        InitializeComponent();
        this.pictureBox1.MouseMove += this.pictureBox_MouseMove;

        pictureBox1.Image = new Bitmap(filename);
        pictureBox1.Refresh();

        //to show exit button which is a seperate form
        var frm3 = new Exitform();
        frm3.FormClosed += (o, e) => this.Close();

        frm3.Show();
        frm3.TopMost = true;
        //to show exit button which is a seperate form

        if (myValue != 0)
        {
            MessageBox.Show("zoinks the value is = " + value);
        }
    }

表格2是

public partial class Exitform : Form
{
    private const int CpNocloseButton = 0x200;

    private bool mouseIsDown = false;
    private Point firstPoint;

    public static sbyte myValue = 0;

    public Exitform()
    {
        InitializeComponent();
        this.TopMost = false;
    }

    protected override CreateParams CreateParams
    {
        get
        {
            CreateParams myCp = base.CreateParams;
            myCp.ClassStyle = myCp.ClassStyle | CpNocloseButton;
            return myCp;
        }
    }

    private void button1_Click(object sender, EventArgs e)
    {
        this.Close();
    }

    private void label1_MouseDown(object sender, MouseEventArgs e)
    {
        firstPoint = e.Location;
        mouseIsDown = true;
        //http://stackoverflow.com/questions/3441762/how-can-i-move-windows-when-mouse-down
    }

    private void label1_MouseUp(object sender, MouseEventArgs e)
    {
        mouseIsDown = false;
    }

    private void label1_MouseMove(object sender, MouseEventArgs e)
    {
        if (mouseIsDown)
        {
            // Get the difference between the two points
            int xDiff = firstPoint.X - e.Location.X;
            int yDiff = firstPoint.Y - e.Location.Y;

            // Set the new point
            int x = this.Location.X - xDiff;
            int y = this.Location.Y - yDiff;
            this.Location = new Point(x, y);
        }
    }

    private void contrast_trackbar_Scroll(object sender, EventArgs e)
    {
        myValue = 1;
    }
}

由于安迪

Answer 1

您可以使用与绑定到Close事件相同的方式绑定到Trackbar Scroll事件。您只需要在Form1和Form2之间准备一个“连接”。

在Form2中创建一个公共属性（例如int TrackBarValue），它返回TrackBar的实际值。
在Form2中创建一个公共自定义事件（例如EventHandler TrackBarValueChanged），当TrackBar值更改时将触发该事件
从Form1绑定到TrackBarValueChanged事件

如果仍不清楚，请在评论中告诉我。

Form1.h

public Fullscreenpreview(string filename)
{
    InitializeComponent();
    this.pictureBox1.MouseMove += this.pictureBox_MouseMove;

    pictureBox1.Image = new Bitmap(filename);
    pictureBox1.Refresh();

    //to show exit button which is a seperate form
    frm3 = new Exitform();
    frm3.FormClosed += (o, e) => this.Close();
    frm3.OnTrackBarValueChanged += new EventHandler(TrackBarValueChanged_Event);

    frm3.Show();
    frm3.TopMost = true;
    //to show exit button which is a seperate form
}


private void TrackBarValueChanged_Event(Object sender, EventArgs e)
{
     ExitForm exit = (ExitForm)sender;
     MessageBox.Show("zoinks the value is = " + exit.TrackBarValue.ToString()); 
}

Form2.h

public partial class Exitform : Form
{
    private const int CpNocloseButton = 0x200;

    private bool mouseIsDown = false;
    private Point firstPoint;

    public event EventHandler OnTrackBarValueChanged;

    public Exitform()
    {
        InitializeComponent();
        this.TopMost = false;
    }

    public int TrackBarValue
    {
        get
        {
            return contrast_trackbar.Value;
        }
    }

    protected override CreateParams CreateParams
    {
        get
        {
            CreateParams myCp = base.CreateParams;
            myCp.ClassStyle = myCp.ClassStyle | CpNocloseButton;
            return myCp;
        }
    }

    private void button1_Click(object sender, EventArgs e)
    {
        this.Close();
    }

    private void label1_MouseDown(object sender, MouseEventArgs e)
    {
        firstPoint = e.Location;
        mouseIsDown = true;
        //http://stackoverflow.com/questions/3441762/how-can-i-move-windows-when-mouse-down
    }

    private void label1_MouseUp(object sender, MouseEventArgs e)
    {
        mouseIsDown = false;
    }

    private void label1_MouseMove(object sender, MouseEventArgs e)
    {
        if (mouseIsDown)
        {
            // Get the difference between the two points
            int xDiff = firstPoint.X - e.Location.X;
            int yDiff = firstPoint.Y - e.Location.Y;

            // Set the new point
            int x = this.Location.X - xDiff;
            int y = this.Location.Y - yDiff;
            this.Location = new Point(x, y);
        }
    }

    private void contrast_trackbar_Scroll(object sender, EventArgs e)
    {
        OnTrackBarValueChanged(this, EventArgs.Empty);
    }
}

Answer 2

Zoltan提供的答案和stackoverflow中提供的答案 Zoom using two forms。为我提供了我正在寻找的答案。使用我从标题中找不到的两种表格缩放。

我将此作为答案发布的唯一原因是将新代码显示为Zoltan答案下方的单独条目，而不是向下滚动到我的代码下方以查看他的回复。

变量名称已从第一次发布更改，因为我刚试验。

表1

public sbyte contrast
{
    get { return Exitform.contrastvalue; }
}

public Fullscreenpreview(string filename)
{
    InitializeComponent();
    this.pictureBox1.MouseMove += this.pictureBox_MouseMove;

    pictureBox1.Image = new Bitmap(filename);
    pictureBox1.Refresh();

    //to show exit button which is a separate form
    var frm3 = new Exitform();
    frm3.FormClosed += (o, e) => this.Close();
    frm3.TrackBarMoved += new Action<int>(ChangeContrast);//<< Added

    frm3.Show();
    frm3.TopMost = true;
    //to show exit button which is a separate form

    frm3.FormClosed -= (o, e) => this.Close();//<< for memory leaks
    frm3.TrackBarMoved -= new Action<int>(ChangeContrast);//<< for memory leaks
}

private void ChangeContrast(int contrastVal)
{
    MessageBox.Show("zoinks the value is = " + contrastVal);
}

表格2

public partial class Exitform : Form
{
    private const int CpNocloseButton = 0x200;

    private bool mouseIsDown = false;
    private Point firstPoint;

    public static sbyte contrastvalue = 0;

    public Exitform()
    {
        InitializeComponent();
        this.TopMost = false;
    }

    protected override CreateParams CreateParams
    {
        get
        {
            CreateParams myCp = base.CreateParams;
            myCp.ClassStyle = myCp.ClassStyle | CpNocloseButton;
            return myCp;
        }
    }

    private void button1_Click(object sender, EventArgs e)
    {
        this.Close();
    }

    private void label1_MouseDown(object sender, MouseEventArgs e)
    {
        firstPoint = e.Location;
        mouseIsDown = true;
        //https://stackoverflow.com/questions/3441762/how-can-i-move-windows-when-mouse-down
    }

    private void label1_MouseUp(object sender, MouseEventArgs e)
    {
        mouseIsDown = false;
    }

    private void label1_MouseMove(object sender, MouseEventArgs e)
    {
        if (mouseIsDown)
        {
            // Get the difference between the two points
            int xDiff = firstPoint.X - e.Location.X;
            int yDiff = firstPoint.Y - e.Location.Y;

            // Set the new point
            int x = this.Location.X - xDiff;
            int y = this.Location.Y - yDiff;
            this.Location = new Point(x, y);
        }
    }

    public event Action<int> TrackBarMoved;// << public event to sense if the trackbar is moved
    private void contrast_trackbar_Scroll(object sender, EventArgs e)
    {
        sbyte contrastVal = (sbyte)(this.contrast_trackbar.Value);//local variable just for use in trackbar

        TrackBarMoved(contrast_trackbar.Value);//pull value is trackbar moved

        string trackerbarvalue = Convert.ToString(contrastVal, CultureInfo.CurrentCulture);// convert to string to push to label
        contrastlabel.Text = trackerbarvalue;//actual push to label

        contrastvalue = (sbyte)contrast_trackbar.Value;
    }
}

除了一些重命名变量，内部清理以及向标签报告轨迹栏的值之外，代码只有一些小的改动。正如Zoltan正确指出的那样，我需要绑定trackbar滚动事件，就像我绑定close事件一样。这是通过。

完成的

frm3.TrackBarMoved += new Action<int>(ChangeContrast);//<< Added

我还添加了取消订阅以帮助防止资源泄漏

frm3.FormClosed -= (o, e) => this.Close();//<< for memory leaks
frm3.TrackBarMoved -= new Action<int>(ChangeContrast);//<< for memory leaks

另一种形式

public event Action<int> TrackBarMoved;// << public event to sense if the trackbar is moved

用于广播事件

由于安迪

Winform Trackbar值以一种形式传递给第二种形式

2 个答案: