Question

好的，所以我的请求解释起来有点复杂。我有一个按钮，点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”的功能，这里是代码：

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，当鼠标在组合框上方时，它将变为红色，当鼠标离开时，它将变回白色。结果实际上是，当鼠标悬停在任何一个组合框上时（当有多个组合框时）只有最后一个组合框被更改。我怎么能做到这一点？非常感谢你。

Answer 1

不要使用this.Controls。触发事件的控件已在sender。

在“输入”和“离开”事件中尝试此操作：

var people_comboBox = sender as ComboBox;

使用您当前的方法，每次单击peopleNum按钮时submitStudent都会递增。因此，如果您单击它3次，则基本上每次都运行此代码：

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

获得多个控件和更改属性

1 个答案: