c# TableLayoutPanel设置滚动条颜色

你可以通过以下代码更改C# TableLayoutPanel控件的滚动条颜色：

1. 使用以下代码创建自定义滚动条类：

public class CustomScrollbar : NativeWindow
{
    private const int WM_PAINT = 0xF;
    private const int WM_NCDESTROY = 0x82;

    private Control _control;
    private VScrollBar _vScrollBar;
    private HScrollBar _hScrollBar;

    public CustomScrollbar(Control control)
    {
        _control = control;
        _vScrollBar = new VScrollBar();
        _hScrollBar = new HScrollBar();

        _vScrollBar.Visible = true;
        _vScrollBar.Scroll += OnScrollBarScroll;
        _vScrollBar.Dock = DockStyle.Right;

        _hScrollBar.Visible = true;
        _hScrollBar.Scroll += OnScrollBarScroll;
        _hScrollBar.Dock = DockStyle.Bottom;

        _control.Controls.Add(_vScrollBar);
        _control.Controls.Add(_hScrollBar);

        AssignHandle(_control.Handle);
    }

    protected override void WndProc(ref Message m)
    {
        base.WndProc(ref m);

        if (m.Msg == WM_PAINT)
        {
            UpdateScrollBarColors();
        }
        else if (m.Msg == WM_NCDESTROY)
        {
            ReleaseHandle();
        }
    }

    private void OnScrollBarScroll(object sender, ScrollEventArgs e)
    {
        _control.Invalidate();
    }

    private void UpdateScrollBarColors()
    {
        Graphics graphics = Graphics.FromHwnd(_vScrollBar.Handle);

        // Change the color of the scrollbar thumb and track
        SolidBrush brush = new SolidBrush(Color.Red);
        graphics.FillRectangle(brush, _vScrollBar.Bounds);

        // Change the color of the scrollbar arrows
        Pen pen = new Pen(Color.Blue);
        graphics.DrawLine(pen, 0, 0, _vScrollBar.Width, _vScrollBar.Height);
        graphics.DrawLine(pen, 0, _vScrollBar.Height, _vScrollBar.Width, 0);

        brush.Dispose();
        pen.Dispose();
        graphics.Dispose();
    }
}

2. 在Form的构造函数中，为TableLayoutPanel控件创建CustomScrollbar对象：

public Form1()
{
    InitializeComponent();

    CustomScrollbar customScrollbar = new CustomScrollbar(tableLayoutPanel1);
}

3. 最后，更新CustomScrollbar类中的UpdateScrollBarColors方法以更改滚动条的颜色。

这样，你就可以使用自定义滚动条来更改TableLayoutPanel控件的滚动条颜色了。