删除TableLayoutPanel中的特定行

Question

我有TableLayoutPanel,我以编程方式添加Rows.用户基本上选择了一个属性,然后将其与一些控件一起显示在表中.我想我在这里有一个普遍的理解问题,我会尝试解释它.

每行中的一个控件是"删除"按钮.该按钮应该删除它所在的行.我所做的是向按钮添加一个事件处理程序并设置当前的rowcount.

deleteTalent.Click += (sender, e) => buttonClickHandler(numberOfRows);

处理程序代码:

private void buttonClickHandler(int rowCount)
{
    int count = rowCount - 1;
    for (int i = count; i < (count + 5); i++)
    {
        balanceTable.Controls.RemoveAt(count);
    }
    balanceTable.RowStyles.RemoveAt(count);
    balanceTable.RowCount--;

}

我看了好几个小时,玩了一下.但我找不到一个干净利落的解决方案.我也是C#的新手

这是创建新行的完整函数:

private void addBalanceItems(ToolStripMenuItem item)
{
    int numberOfRows = balanceTable.RowCount;
    if (numberOfRows > 1)
    {
        balanceTable.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.AutoSize));

    }
    balanceTable.Height = numberOfRows * 45;
    Steigerungsrechner rechner = new Steigerungsrechner();
    string tag = item.Tag.ToString();

    //change that asap :(
    if (tag == "A") { rechner.column = 1; }
    if (tag == "B") { rechner.column = 2; }
    if (tag == "C") { rechner.column = 3; }
    if (tag == "D") { rechner.column = 4; }
    if (tag == "E") { rechner.column = 5; }
    if (tag == "F") { rechner.column = 6; }
    if (tag == "G") { rechner.column = 7; }
    if (tag == "H") { rechner.column = 8; }

    Label talentName = new Label();
    talentName.Text = item.Text;
    talentName.Height = standardHeight;
    talentName.TextAlign = ContentAlignment.MiddleLeft;
    talentName.AutoSize = true;
    Label cost = new Label();
    cost.TextChanged += (sender, e) => costChangeHandler(cost);
    cost.Height = standardHeight;
    cost.TextAlign = ContentAlignment.MiddleLeft;
    TextBox startValue = new TextBox();
    startValue.TextChanged += (sender, e) => startValueChangeHandler(rechner, startValue, cost);
    startValue.Height = standardHeight;
    startValue.TextAlign = HorizontalAlignment.Center;
    TextBox endValue = new TextBox();
    endValue.TextChanged += (sender, e) => endValueChangeHandler(rechner, endValue, cost);
    endValue.Height = standardHeight;
    endValue.TextAlign = HorizontalAlignment.Center;
    Button deleteTalent = new Button();
    deleteTalent.Text = "x";
    deleteTalent.Click += (sender, e) => buttonClickHandler(numberOfRows);
    deleteTalent.Height = standardHeight;

    balanceTable.Controls.Add(talentName);
    balanceTable.Controls.Add(startValue);
    balanceTable.Controls.Add(endValue);
    balanceTable.Controls.Add(cost);
    balanceTable.Controls.Add(deleteTalent);
    balanceTable.Visible = true;
    balanceTable.RowCount++;
}

任何帮助将不胜感激!:)

Answer 1

是的,从TableLayoutPanel中删除任意行根本不直观.他们真的搞砸了这个设计.

删除行的唯一方法是设置RowCount属性.仅这一点就足够奇怪了; 这个属性确实看起来应该是只读的,每次看到它时,这样做的代码对我来说都是错误的.

但除此之外,这种设计的结果是你不能从中间删除行.重置RowCount属性只会导致行从底部掉落.

解决方法有点笨拙,有多个步骤出错:

1. 从要删除的行中删除控件
2. 如果适用,请将这些控件移动到另一行.
3. 移动要删除的行之后的其他行中的所有控件.
4. 最后,通过递减RowCount属性的值来删除最后一行.

一个快速的谷歌搜索显示有人写了和共享代码声称这样做.它在VB.NET中,但应该很容易翻译成你的母语.

我承认,我已经知道只是将其放置并将RowHeight我希望"删除"的行设置为0.这样,自动调整功能可以为您完成工作.但是,您可能仍希望删除它包含的控件.

Answer 2

下面给出了在给定位置移除行的代码.有一点需要提及:我们通过panel.GetControlFromPosition(...)获得的控件必须是可见的,否则它将返回null而不是不可见的控件.

using System.Windows.Forms;

public static class TableLayoutHelper
{
    public static void RemoveArbitraryRow(TableLayoutPanel panel, int rowIndex)
    {
        if (rowIndex >= panel.RowCount)
        {
            return;
        }

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

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

        var removeStyle = panel.RowCount - 1;

        if (panel.RowStyles.Count > removeStyle)
            panel.RowStyles.RemoveAt(removeStyle);

        panel.RowCount--;
    }
}