C# 组合框已更改，清除继续操作的组合框

我想在组合框更改后清除组合框

例如，如果我有组合框1、2和3，如果2已更改，则清除3的内容

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我有点被这一逻辑所束缚。我应该创建一个递归方法来做这样的事情吗？或者仅仅使用“selectedindexchanged”事件？对此有任何想法都会大有裨益

我不太确定您是在使用MVVM模式，还是在使用web或桌面（winforms或wpf）应用程序，因此我不打算具体介绍技术

一种方法是实现每个textbox的textchanged事件，并处理与每个textbox关联的逻辑。如：

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texbox.textchange事件已触发->因此为明文（textbox2）。

向同一事件订阅组合框

bool _ignore;

private void comboBox_SelectedIndexChanged(object sender, System.EventArgs e)
{
    // ignore event if programmatic change
    if(_ignore)
        return;

    _ignore = true;
    // instead of push/pop can be 3 if
    var index = (sender as ComboBox).SelectedIndex; // push
    comboBox1.SelectedIndex = comboBox2.SelectedIndex = comboBox3.SelectedIndex = -1;
    (sender as ComboBox).SelectedIndex = index; // pop
    _ignore = false;
}

试试这个：

    int maxNo = 4; //you can change this no and logic works till 9 comboboxes
    void clearPreceding(ComboBox cmbBox)
    {
        int cmbBoxNo = Convert.ToInt32(cmbBox.Name.Substring(cmbBox.Name.Length - 1));
        for (int i = cmbBoxNo; i <= maxNo; i++)
        {
            ((ComboBox)this.Controls.Find("comboBox" + i, true)[0]).Text = "";
        }
    }

事件处理程序是：

   private void AllCombobox_SelectedIndexChanged(object sender, EventArgs e)
    {
        clearPreceding((ComboBox)sender);
    }

完整代码：

public partial class Form1 : Form
{
    int maxNo = 4;
    public Form1()
    {
        InitializeComponent();
        comboBox1.SelectedIndexChanged+=AllCombobox_SelectedIndexChanged;
        comboBox2.SelectedIndexChanged += AllCombobox_SelectedIndexChanged;
        comboBox3.SelectedIndexChanged += AllCombobox_SelectedIndexChanged;
        comboBox4.SelectedIndexChanged += AllCombobox_SelectedIndexChanged;
    }
    private void AllCombobox_SelectedIndexChanged(object sender, EventArgs e)
    {
        clearPreceding((ComboBox)sender);
    }

    void clearPreceding(ComboBox cmbBox)
    {
        int cmbBoxNo = Convert.ToInt32(cmbBox.Name.Substring(cmbBox.Name.Length - 1));
        for (int i = cmbBoxNo; i <= maxNo; i++)
        {
            ((ComboBox)this.Controls.Find("comboBox" + i, true)[0]).Text = "";
        }
    }
}

公共部分类表单1:表单
{
int maxNo=4；
公共表格1（）
{
初始化组件（）；
ComboBox 1.SelectedIndexChanged+=所有ComboBox\u SelectedIndexChanged；
ComboBox 2.SelectedIndexChanged+=所有ComboBox\u SelectedIndexChanged；
comboBox3.SelectedIndexChanged+=所有ComboBox\u SelectedIndexChanged；
ComboBox 4.SelectedIndexChanged+=所有ComboBox\u SelectedIndexChanged；
}
私有void AllCombobox\u SelectedIndexChanged（对象发送方，事件参数e）
{
ClearPrevious（（组合框）发送方）；
}
无效ClearBox（组合框cmbBox）
{
int-cmbBoxNo=Convert.ToInt32（cmbBox.Name.Substring（cmbBox.Name.Length-1））；
对于（int i=cmboxno；i），不需要递归方法suffice@SudhakarTillapudi winforms@SudhakarTillapudi我在表格上有4个。@user3302467:请在下面检查我的答案
public partial class Form1 : Form
{
    int maxNo = 4;
    public Form1()
    {
        InitializeComponent();
        comboBox1.SelectedIndexChanged+=AllCombobox_SelectedIndexChanged;
        comboBox2.SelectedIndexChanged += AllCombobox_SelectedIndexChanged;
        comboBox3.SelectedIndexChanged += AllCombobox_SelectedIndexChanged;
        comboBox4.SelectedIndexChanged += AllCombobox_SelectedIndexChanged;
    }
    private void AllCombobox_SelectedIndexChanged(object sender, EventArgs e)
    {
        clearPreceding((ComboBox)sender);
    }

    void clearPreceding(ComboBox cmbBox)
    {
        int cmbBoxNo = Convert.ToInt32(cmbBox.Name.Substring(cmbBox.Name.Length - 1));
        for (int i = cmbBoxNo; i <= maxNo; i++)
        {
            ((ComboBox)this.Controls.Find("comboBox" + i, true)[0]).Text = "";
        }
    }
}