Question

我已经让代码工作了，所以当我按下按钮“添加更多”时，它会在表单中添加更多的组合框，名称为dayBox1，dayBox2，依此类推。

这是代码：

        private void addMoreBtn_Click(object sender, EventArgs e)
    {
        //Keep track of how many dayBoxes we have
        howMany++;

        //Make a new instance of ComboBox
        ComboBox dayBox = new System.Windows.Forms.ComboBox();

        //Make a new instance of Point to set the location
        dayBox.Location = new System.Drawing.Point(Left, Top);
        dayBox.Left = 13;
        dayBox.Top = 75 + dayLastTop;

        //Set the name of the box to dayBoxWhateverNumberBoxItIs
        dayBox.Name = "dayBox" + howMany.ToString();

        //The TabIndex = the number of the box
        dayBox.TabIndex = howMany;

        //Make it visible
        dayBox.Visible = true;

        //Set the default text
        dayBox.Text = "Pick One";

        //Copy the items of the original dayBox to the new dayBox
        for (int i = 0; i < dayBoxO.Items.Count; i++)
        {
            dayBox.Items.Add(dayBoxO.Items[i]);
        }

        //Add the control to the form
        this.Controls.Add(dayBox);

        //The location of the last box's top with padding
        dayLastTop = dayBox.Top - 49;
    }

打印随按钮事件添加的框的选定成员的最佳方法是什么？

我之前打印我想要的信息的方式是这样的（仅从一个方框）：

public void saveToFile()
        {     
            FileInfo t = new FileInfo("Workout Log.txt");
            StreamWriter Tex = t.CreateText();
            Tex.WriteLine("---------------Workout Buddy Log---------------");
            Tex.WriteLine("------------------- " + DateTime.Now.ToShortDateString() + " ------------------");
            Tex.Write(Tex.NewLine);
            if (dayBoxO.Text != "Pick One")
            {
                Tex.WriteLine("Day: " + dayBoxO.Text);
            }
            else
            {
                Tex.WriteLine("Day: N/A");
            }
        }

我希望能够为每个盒子执行此操作，每个盒子都在一个新行上。所以，它会是这样的：日:( box1的文字）日:( box2的文字）日:( box3的文字）等等... 谢谢！

Answer 1

假设控件存在于表单上，请遍历表单上的所有控件：

var boxes =  from Control c in this.Controls
             where c.GetType() == typeof(System.Windows.Forms.ComboBox)
             select c;

StringBuilder sb = new StringBuilder();
foreach (Control c in boxes)
{
    sb.AppendLine(c.Text); // ...
}

非Linq方法：

StringBuilder sb = new StringBuilder();
foreach (Control c in this.Controls)
{
    if (c.GetType() == typeof(System.Windows.Forms.ComboBox))
    {
        sb.AppendLine(c.Text); // ...
    }
}

然而，依赖于Controls系列有点笨拙;特别是当你开始有面板和其他分组时。您可以考虑将控件添加到您自己的集合中，正如Josh建议的那样。

Answer 2

我立即看到你可以这样做的两种方式：

第一种是在添加控件时维护这些控件的引用列表。

private List<ComboBox> _comboBoxList = new List<ComboBox>();

...

//Make a new instance of ComboBox
ComboBox dayBox = new System.Windows.Forms.ComboBox();

//Add your combobox to the master list
_comboBoxList.Add(dayBox);

...

然后你的saveToFile（）方法将包含一行如下所示：

foreach(var box in _comboBoxList)
{
      Tex.Write(Tex.NewLine);
      if (box.Text != "Pick One")
      {
          Tex.WriteLine("Day: " + box.Text);
      }
      else
      {
          Tex.WriteLine("Day: N/A");
      }
}

第二种方法是指出Mike指出并走控制列表寻找你的组合框。

从动态添加的组合框打印数据？

2 个答案: