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public partial class Form1 : Form {在此粘贴代码}，即可实现控件自适应窗口的效果

//默认主窗口类名称为Form1，在此添加代码
public partial class Form1: Form {
    public Form1() {
        InitializeComponent();
    }
    //从这里开始复制下面的代码！！！
    //第一步，定义控件自适应窗口类AutoSizeFormClass
    class AutoSizeFormClass {
        public struct controlRect {
            public int Left;
            public int Top;
            public int Width;
            public int Height;
        }
        public List < controlRect > oldCtrl = new List < controlRect > ();
        int ctrlNo = 0;
        //重要方法一：记录窗体和其控件的初始位置和大小controllInitializeSize()
        public void controllInitializeSize(Control mForm) {
            controlRect cR;
            cR.Left = mForm.Left;
            cR.Top = mForm.Top;
            cR.Width = mForm.Width;
            cR.Height = mForm.Height;
            oldCtrl.Add(cR);
            AddControl(mForm);
        }
        private void AddControl(Control ctl) {
            foreach(Control c in ctl.Controls) {
                controlRect objCtrl;
                objCtrl.Left = c.Left;
                objCtrl.Top = c.Top;
                objCtrl.Width = c.Width;
                objCtrl.Height = c.Height;
                oldCtrl.Add(objCtrl);
                if (c.Controls.Count > 0)
                    AddControl(c);
            }
        }
        //重要方法二：控件自适应大小方法controlAutoSize()
        public void controlAutoSize(Control mForm) {
            if (ctrlNo == 0) {
                controlRect cR;
                cR.Left = 0;
                cR.Top = 0;
                cR.Width = mForm.PreferredSize.Width;
                cR.Height = mForm.PreferredSize.Height;
                oldCtrl.Add(cR);
                AddControl(mForm);
            }
            float wScale = (float) mForm.Width / (float) oldCtrl[0].Width;
            float hScale = (float) mForm.Height / (float) oldCtrl[0].Height;
            ctrlNo = 1;
            AutoScaleControl(mForm, wScale, hScale);
        }
        private void AutoScaleControl(Control ctl, float wScale, float hScale) {
            int ctrLeft0, ctrTop0, ctrWidth0, ctrHeight0;
            foreach(Control c in ctl.Controls) {
                ctrLeft0 = oldCtrl[ctrlNo].Left;
                ctrTop0 = oldCtrl[ctrlNo].Top;
                ctrWidth0 = oldCtrl[ctrlNo].Width;
                ctrHeight0 = oldCtrl[ctrlNo].Height;
                c.Left = (int)((ctrLeft0) * wScale);
                c.Top = (int)((ctrTop0) * hScale); //
                c.Width = (int)(ctrWidth0 * wScale);
                c.Height = (int)(ctrHeight0 * hScale); //
                ctrlNo++;
                if (c.Controls.Count > 0)
                    AutoScaleControl(c, wScale, hScale);
                if (ctl is DataGridView) {
                    DataGridView dgv = ctl as DataGridView;
                    Cursor.Current = Cursors.WaitCursor;
                    int widths = 0;
                    for (int i = 0; i < dgv.Columns.Count; i++) {
                        dgv.AutoResizeColumn(i, DataGridViewAutoSizeColumnMode.AllCells); // 自动调整列宽  
                        widths += dgv.Columns[i].Width; // 计算调整列后单元列的宽度和                       
                    }
                    if (widths >= ctl.Size.Width) // 如果调整列的宽度大于设定列宽  
                        dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.DisplayedCells; // 调整列的模式 自动  
                    else
                        dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill; // 如果小于 则填充  
                    Cursor.Current = Cursors.Default;
                }
            }
        }
    }
    //第二步，实例化上面定义的类
    AutoSizeFormClass asc = new AutoSizeFormClass();
    //第三步，初始化窗口时记录控件的大小和位置
    private void Form1_Load(object sender, EventArgs e) {
        asc.controllInitializeSize(this);
    }
    //第四步，主窗口大小发生变化触发的事件
    private void Form1_SizeChanged(object sender, EventArgs e) {
        asc.controlAutoSize(this);
    }
}