对于Loop和Foreach连续循环？

Question

我正在尝试将use的所有列值作为DataTable放在面板中。

但问题是我继续拥有相同的循环。我根据CheckBox限制了数组循环，但它仍在循环中。

Do note that there are tabs (they are sheets from an Excel file I've imported).

以下是我的问题的直观表示。

我想将其剪切到F19并结束循环。

这是我的代码：

Column.Count

Answer 1

你只需要创建一次数组，你只需要迭代一次。

int dynamicHeight = 0;
int padding = 10;

CheckBox[] chk = new CheckBox[dt.Columns.Count];

for (int i = 0; i <= dt.Columns.Count - 1; i++)
{
    var column = dt.Columns[i];
    chk[i] = new CheckBox();
    chk[i].Name = column.ColumnName;
    chk[i].Text = column.ColumnName;
    chk[i].AutoCheck = true;
    chk[i].Bounds = new Rectangle(10, 20 + padding + dynamicHeight, 40, 22);
    panelCol.Controls.Add(chk[i]);
    dynamicHeight += 20;
    panelCol.Size = new Size(120, dynamicHeight);
    panelCol.Controls.Add(chk[i]);
    chk[i].Location = new Point(0, dynamicHeight);
    chk[i].Size = new Size(120, 21);
    panelCol.BackColor = Color.White;
    panelCol.AutoScroll = true;
    //panelCol.AutoScrollMinSize = new Size (0, 1200);
}

实际上，我认为你甚至不需要阵列，除非你以后用它做什么。您可以删除它，只需用chk[i]替换checkBox的每个实例。

Answer 2

添加复选框的代码正在运行dt.Columns.Count * dt.Columns.Count次，理想情况下，它应该只运行dt.Columns.Count次以获得所需的输出。

在不改变实施代码的情况下，以下内容适用于您的情况。

 CheckBox[] chk = new CheckBox[dt.Columns.Count];
 for (int i = 0; i <= dt.Columns.Count - 1; i++)
            {

                chk[i] = new CheckBox();
                chk[i].Name = dt.Columns[i].ColumnName;
                chk[i].Text = dt.Columns[i].ColumnName;
                chk[i].AutoCheck = true;
                chk[i].Bounds = new Rectangle(10, 20 + padding + dynamicHeight, 40, 22);
                panelCol.Controls.Add(chk[i]);
                dynamicHeight += 20;
                panelCol.Size = new Size(120, dynamicHeight);
                panelCol.Controls.Add(chk[i]);
                chk[i].Location = new Point(0, dynamicHeight);
                chk[i].Size = new Size(120, 21);
                panelCol.BackColor = Color.White;
                panelCol.AutoScroll = true;
            }

OR

int i = 0;
CheckBox[] chk = new CheckBox[dt.Columns.Count];
foreach (DataColumn column in dt.Columns)
{

    chk[i] = new CheckBox();
    chk[i].Name = column.ColumnName;
    chk[i].Text = column.ColumnName;
    chk[i].AutoCheck = true;
    chk[i].Bounds = new Rectangle(10, 20 + padding + dynamicHeight, 40, 22);
    panelCol.Controls.Add(chk[i]);
    dynamicHeight += 20;
    panelCol.Size = new Size(120, dynamicHeight);
    panelCol.Controls.Add(chk[i]);
    chk[i].Location = new Point(0, dynamicHeight);
    chk[i].Size = new Size(120, 21);
    panelCol.BackColor = Color.White;
    panelCol.AutoScroll = true;

    i++;
    //panelCol.AutoScrollMinSize = new Size (0, 1200);
}