获取多个控件并更改属性

Question

好的，所以我的请求解释起来有点复杂。我有一个按钮，单击时会执行以下操作：

peopleNum = 0;
topPosition = 10;
public void submitStudent(string name)
    {
        peopleNum++;
        topPosition += 25;

            ComboBox people_comboBox = new ComboBox();
            people_comboBox.Name = "people_comboBox" + peopleNum;
            //ComboBox people_label_finder = this.Controls.Find("people_comboBox" + peopleNum, true).FirstOrDefault as ComboBox;
            people_comboBox.Left = 150;
            people_comboBox.Top = topPosition;

            string[] people_comboBox_itemList = new string[3];
            people_comboBox_itemList[0] = "Present";
            people_comboBox_itemList[1] = "Late";
            people_comboBox_itemList[2] = "Absent";

            people_comboBox.DataSource = people_comboBox_itemList;
            people_comboBox.MouseEnter += new EventHandler(people_comboBox_enter);
            people_comboBox.MouseLeave += new EventHandler(people_comboBox_leave);

        this.Controls.Add(people_comboBox);
    }

然后对于“people_comboBox_enter”和“people_comboBox_leave”的函数，代码如下：

private void people_comboBox_enter(object sender, EventArgs e)
        {
            ComboBox people_comboBox = this.Controls["people_comboBox" + peopleNum] as ComboBox;
            if (people_comboBox != null)
            {
                people_comboBox.BackColor = Color.Red;
            }
        }

        private void people_comboBox_leave(object sender, EventArgs e)
        {
            ComboBox people_comboBox = this.Controls["people_comboBox" + peopleNum] as ComboBox;
            if (people_comboBox != null)
            {
                people_comboBox.BackColor = Color.White;
            }
        }

我想要发生的是，当鼠标在组合框上时，它会变成红色，当鼠标离开时，它会变回白色。结果实际上是，当鼠标悬停在任何组合框上时（当有多个组合框时），只有最后一个被更改。我怎样才能做到这一点？非常感谢。

Answer 1

不要打扰使用this.Controls。触发事件的控件已经在sender。

在你的“进入”和“离开”事件中试试这个：

var people_comboBox = sender as ComboBox;

使用您当前的方法，每次单击 submitStudent 按钮时，peopleNum 都会递增。所以如果你点击它3次，你基本上每次都在运行这段代码：

ComboBox people_comboBox = this.Controls["people_comboBox2"] as ComboBox;