Question

好的，这是我的问题。我为我创建的每个复选框分配值，并且只有在选中它们后才会尝试将它们放入列表框中。所以这是我到目前为止编写的代码，其中当单击按钮时，两个值都被写入列表框，无论是否被选中，我如何使其按照我的解释工作？

public Form1()
    {
        InitializeComponent();
        btnOne.Click += btnOne_Click;
        chckOne.CheckedChanged += chckOne_CheckedChanged;
        chckTwo.CheckStateChanged += chckTwo_CheckStateChanged;
    }
    void btnOne_Click(object sender, EventArgs e)
    { 
        lstOne.Items.Add(number1 + number2);
    }

    string number1 = "ONE", number2 = "TWO";
    void chckOne_CheckedChanged(object sender, EventArgs e)
    {
        CheckBox chk = new CheckBox();
        if (chk.Checked == true)
        {
            lstOne.Items.Add(number1);
        }
     }

    void chckTwo_CheckedChanged(object sender, EventArgs e)
    {
        CheckBox chk = new CheckBox();
        if (chk.Checked == true)
        {
            lstOne.Items.Add(number2);
        }
    }

Answer 1

只需定义一个方法：

void chkBox_CheckedChanged(object sender, EventArgs e)
{
    var chkBox = sender as CheckBox;
    if (chk.Checked == true)
    {
        lstOne.Items.Add(chkBox.Text);
    }
    else
    {
        lstOne.Items.Remove(chkBox.Text);
    }
}

并附上所有CheckBox CheckedChanged事件：

 chckOne.CheckedChanged += chkBox_CheckedChanged;
 chckTwo.CheckStateChanged += chkBox_CheckedChanged;

或者，如果您想在按钮中添加所有选中的值，请单击更改您的方法：

void btnOne_Click(object sender, EventArgs e)
{ 
    this.Controls.OfType<CheckBox>()
                 .Where(c => c.Checked == true)
                 .Select(c => c.Text)
                 .ForEach(text => lstOne.Items.Add(text));
}

Answer 2

List<CheckBox> cbList=new List<CheckBox>();

public Form1()
{
        InitializeComponent();
        btnOne.Click += btnOne_Click;
        cbList.Add(chckOne);
        cbList.Add(chckTwo);
        //All the checkbox should be added into cbList.
}

void btnOne_Click(object sender, EventArgs e)
{ 
    lstOne.Items.Clear();  
    var checked_checkbox = cbList.Where(cb=>cb.Checked==true).ToList();
    if(checked_checkbox.Count>0)
    {
        checked_checkbox.ForEach(x=>lstOne.Items.Add(x.Text));// Maybe you want put text of checkbox into listbox.
    }
}

单击按钮后，选中列表框中显示的复选框值

2 个答案: