看起来您需要根据复选框状态创建消息。您可以创建方法，当某个复选框的状态发生变化时，该方法将执行该工作并调用该方法。

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();
}

或者更好的方法-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名称表单方法。还可以考虑使用 StringBuilder 构建整个消息，然后将其分配给label：

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();
} 

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();