删除TableLayoutPanel内的行会导致布局问题 [英] Remove Row inside TableLayoutPanel makes a layout problem

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本文介绍了删除TableLayoutPanel内的行会导致布局问题的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个WinForms应用程序，该应用程序具有 TableLayoutPanel ;这是定义代码：

  tableLayoutPanel1 = new TableLayoutPanel（）; 
 tableLayoutPanel1.Dock = DockStyle.Fill; 
 tableLayoutPanel1.AutoScroll = true; 
 
 tableLayoutPanel1.RowCount = users.Count + 1; 
 tableLayoutPanel1.ColumnCount = 1; 
 tableLayoutPanel1.GrowStyle = TableLayoutPanelGrowStyle.FixedSize; 
 tableLayoutPanel1.ColumnStyles.Add（new ColumnStyle（SizeType.Percent，100F））; 
 
 foreach（用户中的字符串用户）
 {
 tableLayoutPanel1.RowStyles.Add（new RowStyle（SizeType.Absolute，600F））; 
} 
 tableLayoutPanel1.RowStyles.Add（new RowStyle（SizeType.Absolute，600F））; 
 
 int索引= 0; 
 foreach（用户中的字符串用户）
 {
 AddDockedControl（index，user）; 
 index ++; 
} 
 AddDockedControl（index，null）; 
 
 panel1.Controls.Add（tableLayoutPanel1）; 
 
私有无效AddDockedControl（int row，String userName）
 {
 AccountRowUC newUser = new AccountRowUC（this，userName，row）; 
 newUser.BorderStyle = BorderStyle.FixedSingle; 
 newUser.Dock = DockStyle.Top; 
 tableLayoutPanel1.Controls.Add（newUser，0，row）; 
}

现在，当我要删除其中一行时，我正在使用这段代码：

  public void RemoveRowAtIndex（int index）
 {
 if（index> = tableLayoutPanel1 .RowCount）
回报； 
 
 //删除我们要删除
的行的所有控件（int i = 0; i< tableLayoutPanel1.ColumnCount; i ++）
 {
 var控制= tableLayoutPanel1.GetControlFromPosition（i，index）; 
 tableLayoutPanel1.Controls.Remove（control）; 
} 
 
 //向上移行之后要删除的行控件，因为（int i = index + 1; i< tableLayoutPanel1.RowCount; i ++）
 {
 for（int j = 0; j< tableLayoutPanel1.ColumnCount; j ++）
 {
 var control = tableLayoutPanel1.GetControlFromPosition（j，i）; 
 if（control！= null）
 tableLayoutPanel1.SetRow（control，i-1）; 
} 
} 
 
 //删除最后一行
 
 tableLayoutPanel1.RowStyles.RemoveAt（tableLayoutPanel1.RowCount-1）; 
 //tableLayoutPanel1.RowStyles.RemoveAt(index）; 
 tableLayoutPanel1.RowCount--; 
}

问题是，当我删除Row时，会留有很大的空间表格的底部：TableLayoutPanel不会回收 panel1 的大小。

解决方案

基于注释和此答案的布局的解决方案，先前已发布：



由于通过测试而不是进行说明可以更轻松地了解其工作原理，因此，此处为表单：



测试表单（ frmTLPTest1 ）：

 使用System.Drawing; 
使用System.Linq; 
使用System.Windows.Forms; 
 
公共局部类frmTLPTest1：表格
 {
 public frmTLPTest1（）
 {
 InitializeComponent（）; 
 this.tlp1.RowStyles.RemoveAt（1）; 
} 
 
 private void SOfrmTest1_Load（object sender，EventArgs e）
 {
 TlpAddRow（this.tlp1，false）; 
} 
 
 Random rnd = new Random（）; 
 Size [] size = new Size [] {new Size（75，75），new Size（100，100），new Size（125，125）}; 
 Color [] colors = new Color [] {Color.Red，Color.LightGreen，Color.YellowGreen，Color.SteelBlue}; 
控制selectedObject = null; 
 Control selectedParent = null; 
 
 private void btnAddControl_Click（对象发送者，EventArgs e）
 {
 Size size = new Size（125，125）; 
 if（this.chkRandom.Checked）
 size = sizes [rnd.Next（sizes.Length）]; 
 
 PictureBox pBox = new PictureBox（）
 {
 Anchor = AnchorStyles.None，
 BackColor = colors [rnd.Next（colors.Length）]，
 MinimumSize =大小，
 Size =大小
}; 
 
 bool drawborder = false; 
 pBox.MouseEnter + =（s，evt）=> {drawborder = true; pBox.Invalidate（）; }; 
 pBox.MouseLeave + =（s，evt）=> {drawborder = false; pBox.Invalidate（）; }; 
 pBox.MouseDown + =（s，evt）=> {selectedParent = pBox.Parent; 
 selectedObject = pBox; pBox.Invalidate（）; 
}; 
 pBox.Paint + =（s，evt）=> {
 if（drawborder）{
 ControlPaint.DrawBorder（evt.Graphics，pBox.ClientRectangle，
 Color.White，ButtonBorderStyle.Solid）; 
} 
}; 
 
 if（this.tlp1.RowCount == 0）TlpAddRow（this.tlp1，true）; 
 
 var ctl = this.tlp1.GetControlFromPosition（0，this.tlp1.RowCount-1）; 
 int totalWith = 0; 
 if（ctl.Controls..Count> 0）
 totalWith = ctl.Controls.OfType< Control>（）。Sum（c => c.Width + c.Margin.Left + c .Margin.Right）; 
 totalWith + = ctl.Margin.Right + ctl.Margin.Left + pBox.Size.Width + pBox.Margin.Left + pBox.Margin.Right; 
 
 if（overallWith> = this.tlp1.Width）{
 ctl = TlpAddRow（this.tlp1，true）; 
} 
 ctl.Controls.Add（pBox）; 
} 
 
 private void btnRemoveRow_Click（object sender，EventArgs e）
 {
 if（selectedParent为null）返回； 
 if（selectedParent.Controls.Count> 0）
 {
 for（int i = 0; i == selectedParent.Controls.Count-1; i ++）{
 selectedParent .Controls [i] .Dispose（）; 
} 
} 
 TLPRemoveRow（this.tlp1，selectedParent）; 
 selectedParent.Dispose（）; 
} 
 
 private void btnRemoveControl_Click（object sender，EventArgs e）
 {
 if（selectedObject为null）返回； 
控制父项= selectedObject.Parent; 
 selectedObject.Dispose（）; 
 
 if（parent？.Controls.Count == 0）{
 TLPRemoveRow（this.tlp1，parent）; 
 parent.Dispose（）; 
} 
} 
 
私人控件TlpAddRow（TableLayoutPanel tlp，bool addRowCount）
 {
 var flp = new FlowLayoutPanel（）{
锚点= AnchorStyles.Top | AnchorStyles.Bottom，
 AutoSize = true，
 AutoSizeMode = AutoSizeMode.GrowAndShrink，
}； 
 
 tlp.SuspendLayout（）; 
 if（addRowCount）tlp.RowCount + = 1; 
 tlp.Controls.Add（flp，0，tlp.RowCount-1）; 
 tlp.ResumeLayout（true）; 
 return flp; 
} 
 
 private void TLPRemoveRow（TableLayoutPanel tlp，Control control）
 {
 int ctlRow = this.tlp1.GetRow（control）; 
 TLPRemoveRow（tlp，ctlRow）; 
} 
 
 private void TLPRemoveRow（TableLayoutPanel tlp，int row）
 {
 if（row< this.tlp1.RowCount-1）{
 for（int i = row; i< this.tlp1.RowCount-1; i ++）{
 tlp.SetRow（tlp.GetControlFromPosition（0，i + 1），i）; 
} 
} 
 tlp.RowCount-= 1; 
} 
}

测试表单设计器： 

 局部类frmTLPTest1 
 {
 private System.ComponentModel.IContainer组件= null; 
保护的覆盖无效void Dispose（布尔处理）
 {
 if（dispose&&（components！= null））{
 components.Dispose（）; 
} 
 base.Dispose（处置）; 
} 
 
 private void InitializeComponent（）
 {
 this.panToolbar = new System.Windows.Forms.Panel（）; 
 this.btnRemoveRow = new System.Windows.Forms.Button（）; 
 this.chkRandom = new System.Windows.Forms.CheckBox（）; 
 this.btnRemoveControl = new System.Windows.Forms.Button（）; 
 this.btnAddControl = new System.Windows.Forms.Button（）; 
 this.panBackground = new System.Windows.Forms.Panel（）; 
 this.tlp1 =新的System.Windows.Forms.TableLayoutPanel（）; 
 this.panToolbar.SuspendLayout（）; 
 this.panBackground.SuspendLayout（）; 
 this.SuspendLayout（）; 
 // 
 // panToolbar 
 // 
 this.panToolbar.BackColor = System.Drawing.Color.DarkOliveGreen; 
 this.panToolbar.Controls.Add（this.btnRemoveRow）; 
 this.panToolbar.Controls.Add（this.chkRandom）; 
 this.panToolbar.Controls.Add（this.btnRemoveControl）; 
 this.panToolbar.Controls.Add（this.btnAddControl）; 
 this.panToolbar.Dock = System.Windows.Forms.DockStyle.Bottom; 
 this.panToolbar.Location = new System.Drawing.Point（0，359）; 
 this.panToolbar.Name = panToolbar; 
 this.panToolbar.Size = new System.Drawing.Size（552，55）; 
 this.panToolbar.TabIndex = 2; 
 // 
 // btnRemoveRow 
 // 
 this.btnRemoveRow.BackColor = System.Drawing.Color.FromArgb（（（int）（（（（byte）（32））） ）），（（（int）（（（byte）（32）））），（（int（（（byte）（32）））））;; 
 this.btnRemoveRow.FlatAppearance.MouseDownBackColor = System.Drawing.Color.FromArgb（（（（int）（（（（byte）（192））））），（（int（（（byte）（64）））） ），（（int）（（（（byte）（0）））））; 
 this.btnRemoveRow.FlatAppearance.MouseOverBackColor = System.Drawing.Color.FromArgb（（（（int）（（（（byte）（128））））），（（int（（（byte）（64）））） ），（（int）（（（（byte）（0）））））; 
 this.btnRemoveRow.FlatStyle = System.Windows.Forms.FlatStyle.Flat; 
 this.btnRemoveRow.ForeColor = System.Drawing.Color.White; 
 this.btnRemoveRow.Location = new System.Drawing.Point（261，11）; 
 this.btnRemoveRow.Name = btnRemoveRow; 
 this.btnRemoveRow.Size = new System.Drawing.Size（119，34）; 
 this.btnRemoveRow.TabIndex = 4; 
 this.btnRemoveRow.Text =删除行; 
 this.btnRemoveRow.UseVisualStyleBackColor = false; 
 this.btnRemoveRow.Click + = new System.EventHandler（this.btnRemoveRow_Click）; 
 // 
 // chkRandom 
 // 
 this.chkRandom.AutoSize = true; 
 this.chkRandom.ForeColor = System.Drawing.Color.White; 
 this.chkRandom.Location =新的System.Drawing.Point（446，20）; 
 this.chkRandom.Name = chkRandom; 
 this.chkRandom.Size = new System.Drawing.Size（94，19）; 
 this.chkRandom.TabIndex = 3; 
 this.chkRandom.Text =随机大小; 
 this.chkRandom.UseVisualStyleBackColor = true; 
 // 
 // btnRemoveControl 
 // 
 this.btnRemoveControl.BackColor = System.Drawing.Color.FromArgb（（（int）（（（（byte）（32））） ）），（（（int）（（（byte）（32）））），（（int（（（byte）（32）））））;; 
 this.btnRemoveControl.FlatAppearance.MouseDownBackColor = System.Drawing.Color.FromArgb（（（（int）（（（（byte）（192））））），（（int（（（byte）（64）））） ），（（int）（（（（byte）（0）））））; 
 this.btnRemoveControl.FlatAppearance.MouseOverBackColor = System.Drawing.Color.FromArgb（（（（int）（（（（byte）（128））））），（（int）（（（（byte）（64）））） ），（（int）（（（（byte）（0）））））; 
 this.btnRemoveControl.FlatStyle = System.Windows.Forms.FlatStyle.Flat; 
 this.btnRemoveControl.ForeColor = System.Drawing.Color.White; 
 this.btnRemoveControl.Location = new System.Drawing.Point（136，11）; 
 this.btnRemoveControl.Name = btnRemoveControl; 
 this.btnRemoveControl.Size = new System.Drawing.Size（119，34）; 
 this.btnRemoveControl.TabIndex = 2; 
 this.btnRemoveControl.Text =删除控件; 
 this.btnRemoveControl.UseVisualStyleBackColor = false; 
 this.btnRemoveControl.Click + = new System.EventHandler（this.btnRemoveControl_Click）; 
 // 
 // btnAddControl 
 // 
 this.btnAddControl.BackColor = System.Drawing.Color.FromArgb（（（（int）（（（（byte）（32））） ）），（（（int）（（（byte）（32）））），（（int（（（byte）（32）））））;; 
 this.btnAddControl.FlatAppearance.MouseDownBackColor = System.Drawing.Color.FromArgb（（（int）（（（（byte）（192）））），（（int）（（（（byte）（64）））） ），（（int）（（（（byte）（0）））））; 
 this.btnAddControl.FlatAppearance.MouseOverBackColor = System.Drawing.Color.FromArgb（（（int）（（（（byte）（128）））），（（int）（（（（byte）（64）））） ），（（int）（（（（byte）（0）））））; 
 this.btnAddControl.FlatStyle = System.Windows.Forms.FlatStyle.Flat; 
 this.btnAddControl.ForeColor = System.Drawing.Color.White; 
 this.btnAddControl.Location = new System.Drawing.Point（11，11）; 
 this.btnAddControl.Name = btnAddControl; 
 this.btnAddControl.Size = new System.Drawing.Size（119，34）; 
 this.btnAddControl.TabIndex = 0; 
 this.btnAddControl.Text =添加控件; 
 this.btnAddControl.UseVisualStyleBackColor = false; 
 this.btnAddControl.Click + = new System.EventHandler（this.btnAddControl_Click）; 
 // 
 // panBackground 
 // 
 this.panBackground.Anchor =（（（System.Windows.Forms.AnchorStyles）（（（（（System.Windows.Forms.AnchorStyles .Top | System.Windows.Forms.AnchorStyles.Bottom）
 | System.Windows.Forms.AnchorStyles.Left）
 | System.Windows.Forms.AnchorStyles.Right））））； 
 this.panBackground.AutoScroll = true; 
 this.panBackground.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink; 
 this.panBackground.BackColor = System.Drawing.Color.FromArgb（（（（int）（（（byte）（32）））））（（（int）（（（byte）（32））））， （（int）（（（（byte）（32））））））;; 
 this.panBackground.Controls.Add（this.tlp1）; 
 this.panBackground.Location = new System.Drawing.Point（0，0）; 
 this.panBackground.Name = panBackground; 
 this.panBackground.Size = new System.Drawing.Size（552，360）; 
 this.panBackground.TabIndex = 3; 
 // 
 // tlp1 
 // 
 this.tlp1.AutoSize = true; 
 this.tlp1.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink; 
 this.tlp1.BackColor = System.Drawing.Color.FromArgb（（（（int）（（（byte）（32）））））（（（int）（（（byte）（32））））， （（int）（（（（byte）（32））））））;; 
 this.tlp1.CellBorderStyle = System.Windows.Forms.TableLayoutPanelCellBorderStyle.Single; 
 this.tlp1.ColumnCount = 1; 
 this.tlp1.ColumnStyles.Add（new System.Windows.Forms.ColumnStyle（））; 
 this.tlp1.ColumnStyles.Add（new System.Windows.Forms.ColumnStyle（System.Windows.Forms.SizeType.Absolute，20F））; 
 this.tlp1.Dock = System.Windows.Forms.DockStyle.Top; 
 this.tlp1.Location = new System.Drawing.Point（0，0）; 
 this.tlp1.Name = tlp1; 
 this.tlp1.RowCount = 1; 
 this.tlp1.RowStyles.Add（new System.Windows.Forms.RowStyle（））; 
 this.tlp1.RowStyles.Add（new System.Windows.Forms.RowStyle（System.Windows.Forms.SizeType.Absolute，1F））; 
 this.tlp1.Size = new System.Drawing.Size（552，2）; 
 this.tlp1.TabIndex = 4; 
 // 
 // frmTLPTest1 
 // 
 this.AutoScaleDimensions = new System.Drawing.SizeF（96F，96F）; 
 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Dpi; 
 this.ClientSize = new System.Drawing.Size（552，414）; 
 this.Controls.Add（this.panBackground）; 
 this.Controls.Add（this.panToolbar）; 
 this.Font =新的System.Drawing.Font（ Segoe UI，9F，System.Drawing.FontStyle.Regular，System.Drawing.GraphicsUnit.Point，（（byte（（0））））; 
 this.Name = frmTLPTest1; 
 this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen; 
 this.Text = frmTLPTest1; 
 this.Load + = new System.EventHandler（this.SOfrmTest1_Load）; 
 this.panToolbar.ResumeLayout（false）; 
 this.panToolbar.PerformLayout（）; 
 this.panBackground.ResumeLayout（false）; 
 this.panBackground.PerformLayout（）; 
 this.ResumeLayout（false）; 
 
} 
 
 private System.Windows.Forms.Panel panToolbar; 
私人System.Windows.Forms.Button btnAddControl; 
私人System.Windows.Forms.Button btnRemoveControl; 
私人System.Windows.Forms.CheckBox chkRandom; 
私人System.Windows.Forms.Panel panBackground; 
私人System.Windows.Forms.TableLayoutPanel tlp1; 
私人System.Windows.Forms.Button btnRemoveRow; 
}


I have a WinForms application that has a TableLayoutPanel; this is the definition code:

tableLayoutPanel1 = new TableLayoutPanel();
tableLayoutPanel1.Dock = DockStyle.Fill;
tableLayoutPanel1.AutoScroll = true;

tableLayoutPanel1.RowCount = users.Count + 1;
tableLayoutPanel1.ColumnCount = 1;
tableLayoutPanel1.GrowStyle = TableLayoutPanelGrowStyle.FixedSize;
tableLayoutPanel1.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 100F));

foreach (String user in users)
{
    tableLayoutPanel1.RowStyles.Add(new RowStyle(SizeType.Absolute, 600F));
}
tableLayoutPanel1.RowStyles.Add(new RowStyle(SizeType.Absolute, 600F));

int index = 0;
foreach (String user in users)
{
    AddDockedControl(index, user);
    index++;
}
AddDockedControl(index, null);

panel1.Controls.Add(tableLayoutPanel1);

private void AddDockedControl(int row, String userName)
{
    AccountRowUC newUser = new AccountRowUC(this, userName, row);
    newUser.BorderStyle = BorderStyle.FixedSingle;
    newUser.Dock = DockStyle.Top;
    tableLayoutPanel1.Controls.Add(newUser, 0, row);
}

Now, when I want to remove one of the rows, I'm using this code: 

public void RemoveRowAtIndex(int index)
{
    if (index >= tableLayoutPanel1.RowCount)
        return;

    // delete all controls of row that we want to delete
    for (int i = 0; i < tableLayoutPanel1.ColumnCount; i++)
    {
        var control = tableLayoutPanel1.GetControlFromPosition(i, index);
        tableLayoutPanel1.Controls.Remove(control);
    }

    // move up row controls that comes after row we want to remove
    for (int i = index + 1; i < tableLayoutPanel1.RowCount; i++)
    {
        for (int j = 0; j < tableLayoutPanel1.ColumnCount; j++)
        {
            var control = tableLayoutPanel1.GetControlFromPosition(j, i);
            if (control != null)
                tableLayoutPanel1.SetRow(control, i - 1);
        }
    }

    // remove last row

    tableLayoutPanel1.RowStyles.RemoveAt(tableLayoutPanel1.RowCount - 1);
    //tableLayoutPanel1.RowStyles.RemoveAt(index);
    tableLayoutPanel1.RowCount--;
}

The problem is that when I remove a Row, a big space is left at the bottom of the table: the TableLayoutPanel won't reclaim the size of panel1.

解决方案

A solution base on the layout described in the comments and this answer, previously posted:
Center multiple rows of controls in a FlowLayoutPanel

Description:
(Full code of a test Form provided at bottom of this post)

  1. Create a new Form (here, named frmTLPTest1)
  2. Add two Panels. One is used to host some buttons, the other one will be the Container of a TableLayoutPanel.
  3. Set the Container panel to AutoScroll = true, AutoSizeMode = AutoSizeMode.GrowAndShrink, set all the Anchors (Left, Top, Right, Bottom)
  4. Inside the Container panel, drop a new TableLayoutPanel: set it to AutoSize = true, AutoSizeMode = AutoSizeMode.GrowAndShrink, Dock = DockStyle.Top
  5. Remove all Rows and Columns from the TableLayoutPanel except one of each (you cannot remove all). Set the dimensions of both to AutoSize.

Important note (also reported in the linked answer):

In the Form constructor, one of the RowStyles is removed. This is important: the TLP will keep 2 RowStyles. One is applied to the existing Row; the second style will be applied to the first Row you add: to the first one only, not the others. If this style is not removed, it will compromise the layout.

The core methods used to Add Rows to/Remove Rows from the TableLayoutPanel, make use of a FlowLayoutPanel as the TLP Row content and can also be used as Container of other controls, eventually.

TlpAddRow(TableLayoutPanel tlp, bool addRowCount) method:
Adds a new FlowLayoutPanel to the Cell of the TableLayoutPanel specified and adds a new Row if requested.
Since the Designer won't allow to remove all the Rows, the First Row (FlowLayoutPanel) must not increment the Rows count: the addRowCount argument will be set to false. 

private Control TlpAddRow(TableLayoutPanel tlp, bool addRowCount)
{
    var flp = new FlowLayoutPanel() {
        Anchor = AnchorStyles.Top | AnchorStyles.Bottom,
        AutoSize = true,
        AutoSizeMode = AutoSizeMode.GrowAndShrink,
    };

    tlp.SuspendLayout();
    if (addRowCount) tlp.RowCount += 1;
    tlp.Controls.Add(flp, 0, tlp.RowCount - 1);
    tlp.ResumeLayout(true);
    return flp;
}

TLPRemoveRow(TableLayoutPanel tlp, Control control) method (overloaded):

Allows to remove a Row from the specified TableLayoutPanel. The Row to be removed can be derived from the Control that is used as the Row Container (a FlowLayoutPanel, here, but it could be a Panel, another TableLayoutPanel, or some other type of Container control).
The Row can also be removed by directly specifying the Row index. 

private void TLPRemoveRow(TableLayoutPanel tlp, Control control)
{
    int ctlRow = this.tlp1.GetRow(control);
    TLPRemoveRow(tlp, ctlRow);
}

private void TLPRemoveRow(TableLayoutPanel tlp, int row)
{
    if (row < this.tlp1.RowCount - 1) {
        for (int i = row; i < this.tlp1.RowCount - 1; i++) {
            tlp.SetRow(tlp.GetControlFromPosition(0, i + 1), i);
        }
    }
    tlp.RowCount -= 1;
}

Visual results of this Layout:

Since it's easier to understand how it work by testing rather than explaining, here's the full layout of the Form:

Test Form (frmTLPTest1): 

using System.Drawing;
using System.Linq;
using System.Windows.Forms;

public partial class frmTLPTest1 : Form
{
    public frmTLPTest1()
    {
        InitializeComponent();
        this.tlp1.RowStyles.RemoveAt(1);
    }

    private void SOfrmTest1_Load(object sender, EventArgs e)
    {
        TlpAddRow(this.tlp1, false);
    }

    Random rnd = new Random();
    Size[] sizes = new Size[] { new Size(75, 75), new Size(100, 100), new Size(125, 125)};
    Color[] colors = new Color[] { Color.Red, Color.LightGreen, Color.YellowGreen, Color.SteelBlue };
    Control selectedObject = null;
    Control selectedParent = null;

    private void btnAddControl_Click(object sender, EventArgs e)
    {
        Size size = new Size(125, 125);
        if (this.chkRandom.Checked)
            size = sizes[rnd.Next(sizes.Length)];

        PictureBox pBox = new PictureBox()
        {
            Anchor = AnchorStyles.None,
            BackColor = colors[rnd.Next(colors.Length)],
            MinimumSize = size,
            Size = size
        };

        bool drawborder = false;
        pBox.MouseEnter += (s, evt) => { drawborder = true;  pBox.Invalidate(); };
        pBox.MouseLeave += (s, evt) => { drawborder = false; pBox.Invalidate(); };
        pBox.MouseDown += (s, evt) => { selectedParent = pBox.Parent;
                                        selectedObject = pBox;  pBox.Invalidate();
        };
        pBox.Paint += (s, evt) => {
            if (drawborder) {
                ControlPaint.DrawBorder(evt.Graphics, pBox.ClientRectangle, 
                                        Color.White, ButtonBorderStyle.Solid);
            }
        };

        if (this.tlp1.RowCount == 0) TlpAddRow(this.tlp1, true); 

        var ctl = this.tlp1.GetControlFromPosition(0, this.tlp1.RowCount - 1);
        int overallWith = 0;
        if (ctl.Controls?.Count > 0)
            overallWith = ctl.Controls.OfType<Control>().Sum(c => c.Width + c.Margin.Left + c.Margin.Right);
        overallWith += ctl.Margin.Right + ctl.Margin.Left + pBox.Size.Width + pBox.Margin.Left + pBox.Margin.Right;

        if (overallWith >= this.tlp1.Width) {
            ctl = TlpAddRow(this.tlp1, true);
        }
        ctl.Controls.Add(pBox);
    }

    private void btnRemoveRow_Click(object sender, EventArgs e)
    {
        if (selectedParent is null) return;
        if (selectedParent.Controls.Count > 0)
        {
            for (int i = 0; i == selectedParent.Controls.Count - 1; i++) {
                selectedParent.Controls[i].Dispose();
            }
        }
        TLPRemoveRow(this.tlp1, selectedParent);
        selectedParent.Dispose();
    }

    private void btnRemoveControl_Click(object sender, EventArgs e)
    {
        if (selectedObject is null) return;
        Control parent = selectedObject.Parent;
        selectedObject.Dispose();

        if (parent?.Controls.Count == 0) {
            TLPRemoveRow(this.tlp1, parent);
            parent.Dispose();
        }
    }

    private Control TlpAddRow(TableLayoutPanel tlp, bool addRowCount)
    {
        var flp = new FlowLayoutPanel() {
            Anchor = AnchorStyles.Top | AnchorStyles.Bottom,
            AutoSize = true,
            AutoSizeMode = AutoSizeMode.GrowAndShrink,
        };

        tlp.SuspendLayout();
        if (addRowCount) tlp.RowCount += 1;
        tlp.Controls.Add(flp, 0, tlp.RowCount - 1);
        tlp.ResumeLayout(true);
        return flp;
    }

    private void TLPRemoveRow(TableLayoutPanel tlp, Control control)
    {
        int ctlRow = this.tlp1.GetRow(control);
        TLPRemoveRow(tlp, ctlRow);
    }

    private void TLPRemoveRow(TableLayoutPanel tlp, int row)
    {
        if (row < this.tlp1.RowCount - 1) {
            for (int i = row; i < this.tlp1.RowCount - 1; i++) {
                tlp.SetRow(tlp.GetControlFromPosition(0, i + 1), i);
            }
        }
        tlp.RowCount -= 1;
    }
}

Test Form Designer: 

partial class frmTLPTest1
{
    private System.ComponentModel.IContainer components = null;
    protected override void Dispose(bool disposing)
    {
        if (disposing && (components != null)) {
            components.Dispose();
        }
        base.Dispose(disposing);
    }

    private void InitializeComponent()
    {
        this.panToolbar = new System.Windows.Forms.Panel();
        this.btnRemoveRow = new System.Windows.Forms.Button();
        this.chkRandom = new System.Windows.Forms.CheckBox();
        this.btnRemoveControl = new System.Windows.Forms.Button();
        this.btnAddControl = new System.Windows.Forms.Button();
        this.panBackground = new System.Windows.Forms.Panel();
        this.tlp1 = new System.Windows.Forms.TableLayoutPanel();
        this.panToolbar.SuspendLayout();
        this.panBackground.SuspendLayout();
        this.SuspendLayout();
        // 
        // panToolbar
        // 
        this.panToolbar.BackColor = System.Drawing.Color.DarkOliveGreen;
        this.panToolbar.Controls.Add(this.btnRemoveRow);
        this.panToolbar.Controls.Add(this.chkRandom);
        this.panToolbar.Controls.Add(this.btnRemoveControl);
        this.panToolbar.Controls.Add(this.btnAddControl);
        this.panToolbar.Dock = System.Windows.Forms.DockStyle.Bottom;
        this.panToolbar.Location = new System.Drawing.Point(0, 359);
        this.panToolbar.Name = "panToolbar";
        this.panToolbar.Size = new System.Drawing.Size(552, 55);
        this.panToolbar.TabIndex = 2;
        // 
        // btnRemoveRow
        // 
        this.btnRemoveRow.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(32)))), ((int)(((byte)(32)))), ((int)(((byte)(32)))));
        this.btnRemoveRow.FlatAppearance.MouseDownBackColor = System.Drawing.Color.FromArgb(((int)(((byte)(192)))), ((int)(((byte)(64)))), ((int)(((byte)(0)))));
        this.btnRemoveRow.FlatAppearance.MouseOverBackColor = System.Drawing.Color.FromArgb(((int)(((byte)(128)))), ((int)(((byte)(64)))), ((int)(((byte)(0)))));
        this.btnRemoveRow.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
        this.btnRemoveRow.ForeColor = System.Drawing.Color.White;
        this.btnRemoveRow.Location = new System.Drawing.Point(261, 11);
        this.btnRemoveRow.Name = "btnRemoveRow";
        this.btnRemoveRow.Size = new System.Drawing.Size(119, 34);
        this.btnRemoveRow.TabIndex = 4;
        this.btnRemoveRow.Text = "Remove Row";
        this.btnRemoveRow.UseVisualStyleBackColor = false;
        this.btnRemoveRow.Click += new System.EventHandler(this.btnRemoveRow_Click);
        // 
        // chkRandom
        // 
        this.chkRandom.AutoSize = true;
        this.chkRandom.ForeColor = System.Drawing.Color.White;
        this.chkRandom.Location = new System.Drawing.Point(446, 20);
        this.chkRandom.Name = "chkRandom";
        this.chkRandom.Size = new System.Drawing.Size(94, 19);
        this.chkRandom.TabIndex = 3;
        this.chkRandom.Text = "Random Size";
        this.chkRandom.UseVisualStyleBackColor = true;
        // 
        // btnRemoveControl
        // 
        this.btnRemoveControl.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(32)))), ((int)(((byte)(32)))), ((int)(((byte)(32)))));
        this.btnRemoveControl.FlatAppearance.MouseDownBackColor = System.Drawing.Color.FromArgb(((int)(((byte)(192)))), ((int)(((byte)(64)))), ((int)(((byte)(0)))));
        this.btnRemoveControl.FlatAppearance.MouseOverBackColor = System.Drawing.Color.FromArgb(((int)(((byte)(128)))), ((int)(((byte)(64)))), ((int)(((byte)(0)))));
        this.btnRemoveControl.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
        this.btnRemoveControl.ForeColor = System.Drawing.Color.White;
        this.btnRemoveControl.Location = new System.Drawing.Point(136, 11);
        this.btnRemoveControl.Name = "btnRemoveControl";
        this.btnRemoveControl.Size = new System.Drawing.Size(119, 34);
        this.btnRemoveControl.TabIndex = 2;
        this.btnRemoveControl.Text = "Remove Control";
        this.btnRemoveControl.UseVisualStyleBackColor = false;
        this.btnRemoveControl.Click += new System.EventHandler(this.btnRemoveControl_Click);
        // 
        // btnAddControl
        // 
        this.btnAddControl.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(32)))), ((int)(((byte)(32)))), ((int)(((byte)(32)))));
        this.btnAddControl.FlatAppearance.MouseDownBackColor = System.Drawing.Color.FromArgb(((int)(((byte)(192)))), ((int)(((byte)(64)))), ((int)(((byte)(0)))));
        this.btnAddControl.FlatAppearance.MouseOverBackColor = System.Drawing.Color.FromArgb(((int)(((byte)(128)))), ((int)(((byte)(64)))), ((int)(((byte)(0)))));
        this.btnAddControl.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
        this.btnAddControl.ForeColor = System.Drawing.Color.White;
        this.btnAddControl.Location = new System.Drawing.Point(11, 11);
        this.btnAddControl.Name = "btnAddControl";
        this.btnAddControl.Size = new System.Drawing.Size(119, 34);
        this.btnAddControl.TabIndex = 0;
        this.btnAddControl.Text = "Add Control";
        this.btnAddControl.UseVisualStyleBackColor = false;
        this.btnAddControl.Click += new System.EventHandler(this.btnAddControl_Click);
        // 
        // panBackground
        // 
        this.panBackground.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
        | System.Windows.Forms.AnchorStyles.Left) 
        | System.Windows.Forms.AnchorStyles.Right)));
        this.panBackground.AutoScroll = true;
        this.panBackground.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink;
        this.panBackground.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(32)))), ((int)(((byte)(32)))), ((int)(((byte)(32)))));
        this.panBackground.Controls.Add(this.tlp1);
        this.panBackground.Location = new System.Drawing.Point(0, 0);
        this.panBackground.Name = "panBackground";
        this.panBackground.Size = new System.Drawing.Size(552, 360);
        this.panBackground.TabIndex = 3;
        // 
        // tlp1
        // 
        this.tlp1.AutoSize = true;
        this.tlp1.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink;
        this.tlp1.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(32)))), ((int)(((byte)(32)))), ((int)(((byte)(32)))));
        this.tlp1.CellBorderStyle = System.Windows.Forms.TableLayoutPanelCellBorderStyle.Single;
        this.tlp1.ColumnCount = 1;
        this.tlp1.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle());
        this.tlp1.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Absolute, 20F));
        this.tlp1.Dock = System.Windows.Forms.DockStyle.Top;
        this.tlp1.Location = new System.Drawing.Point(0, 0);
        this.tlp1.Name = "tlp1";
        this.tlp1.RowCount = 1;
        this.tlp1.RowStyles.Add(new System.Windows.Forms.RowStyle());
        this.tlp1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Absolute, 1F));
        this.tlp1.Size = new System.Drawing.Size(552, 2);
        this.tlp1.TabIndex = 4;
        // 
        // frmTLPTest1
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(96F, 96F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Dpi;
        this.ClientSize = new System.Drawing.Size(552, 414);
        this.Controls.Add(this.panBackground);
        this.Controls.Add(this.panToolbar);
        this.Font = new System.Drawing.Font("Segoe UI", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
        this.Name = "frmTLPTest1";
        this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
        this.Text = "frmTLPTest1";
        this.Load += new System.EventHandler(this.SOfrmTest1_Load);
        this.panToolbar.ResumeLayout(false);
        this.panToolbar.PerformLayout();
        this.panBackground.ResumeLayout(false);
        this.panBackground.PerformLayout();
        this.ResumeLayout(false);

    }

    private System.Windows.Forms.Panel panToolbar;
    private System.Windows.Forms.Button btnAddControl;
    private System.Windows.Forms.Button btnRemoveControl;
    private System.Windows.Forms.CheckBox chkRandom;
    private System.Windows.Forms.Panel panBackground;
    private System.Windows.Forms.TableLayoutPanel tlp1;
    private System.Windows.Forms.Button btnRemoveRow;
}

这篇关于删除TableLayoutPanel内的行会导致布局问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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