仍然选中复选框时,在文本框中保留消息

时间:2012-12-09 16:54:24

标签: c# .net

我在文本框中有3个带有相应消息的复选框。当复选框仍处于选中状态时,我的老师希望邮件保留在文本框中,并在未选中时隐藏文本。在我的情况下,当我检查3个复选框时,它们将显示3个相应的消息,但是当我取消选中其中一个复选框并且仍然检查其他两个时,所有消息都将消失。我的问题是,当我取消选中其中一个复选框并且仍然检查其他2个时,相应的消息以及其余两个选中的复选框将保留在其文本框中。

private void chkCarWheels_CheckedChanged(object sender, EventArgs e)
{
    if (chkCarWheels.Checked == true)
        lblMessage.Text = lblMessage.Text + mycar.hasWheels(4);
    else
        lblMessage.Text = "My  " + txtName.Text + " Car";
}

private void chkCarAcceleration_CheckedChanged(object sender, EventArgs e)
{
    if (chkCarAcceleration.Checked == true)
       lblMessage.Text = lblMessage.Text + mycar.Accelerate();
    else
        lblMessage.Text = "My  " + txtName.Text + " Car";
} 

private void chkCarBreakpad_CheckedChanged(object sender, EventArgs e)
{
    if (chkCarBreakpad.Checked == true)
        lblMessage.Text = lblMessage.Text + mycar.hasBreak();
    else
        lblMessage.Text = "My  " + txtName.Text + " Car";
}

2 个答案:

答案 0 :(得分:0)

看起来您需要根据复选框状态创建消息。您可以创建方法,该方法将完成工作并在某些复选框的状态发生变化时调用它。

private void chkCarWheels_CheckedChanged(object sender, EventArgs e)
{
    BuildMessage();
}

private void chkCarAcceleration_CheckedChanged(object sender, EventArgs e)
{
    BuildMessage();
} 

private void chkCarBreakpad_CheckedChanged(object sender, EventArgs e)
{
    BuildMessage();
}

或者更好的一个 - 为所有复选框创建一个事件处理程序

// use for chkCarWheels, chkCarAcceleration, chkCarBreakpad
private void chkCar_CheckedChanged(object sender, EventArgs e)
{
    BuildMessage();
}

private void BuildMessage()
{     
    lblMessage.Text = "My  " + txtName.Text + " Car";
    if (chkCarWheels.Checked)
        lblMessage.Text = lblMessage.Text + mycar.hasWheels(4);
    if (chkCarAcceleration.Checked)
       lblMessage.Text = lblMessage.Text + mycar.Accelerate();
    if (chkCarBreakpad.Checked)
       lblMessage.Text = lblMessage.Text + mycar.hasBreak();
}

您不需要将布尔值与true / false进行比较。直接使用这些值if (chkCarWheels.Checked)。请记住,在C#中我们使用CamelCase名称形式方法。还要考虑使用StringBuilder构建整个邮件,然后将其分配给标签:

private void BuildMessage()
{
    StringBuilder sb = new StringBuilder();
    sb.AppendFormat("My {0} Car", txtName.Text);
    if (chkCarWheels.Checked)
        sb.Append(mycar.hasWheels(4));
    if (chkCarAcceleration.Checked)
       sb.Append(mycar.Accelerate());
    if (chkCarBreakpad.Checked)
       sb.Append((mycar.hasBreak());
    lblMessage.Text = sb.ToString();
} 

答案 1 :(得分:0)

试试这个:

    private void chkCarWheels_CheckedChanged(object sender, EventArgs e)
    {
        chkCar();
    }

    private void chkCarAcceleration_CheckedChanged(object sender, EventArgs e)
    {
        chkCar();
    } 

    private void chkCarBreakpad_CheckedChanged(object sender, EventArgs e)
    {
       chkCar()
    } 



private void chkCar()
{

string msg="";

if (chkCarWheels.Checked)
msg=msg+mycar.hasWheels(4);

if(chkCarAcceleration.Checked)
msg=msg+mycar.Accelerate();

if(chkCarBreakpad.Checked)
msg=msg+mycar.hasBreak();

lblMessage.Text=msg;

}