Question

c#关于comboBox1_SelectedIndexChanged的问题

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) //压力探测01的接线通道号选择与其他通道号重复时不可选（下同）
{
if (checkBox1.Checked == true)
{
if (comboBox1.Text == comboBox2.Text | comboBox1.Text == comboBox3.Text | comboBox1.Text == comboBox4.Text
|comboBox1.Text == comboBox5.Text| comboBox1.Text == comboBox6.Text | comboBox1.Text == comboBox7.Text
|comboBox1.Text == comboBox8.Text | comboBox1.Text == comboBox9.Text| comboBox1.Text == comboBox10.Text
|comboBox1.Text == comboBox11.Text | comboBox1.Text == comboBox12.Text)
{
comboBox1.SelectedIndex = -1;
MessageBox.Show("此通道号已被选择，请更换！");
}
}
else
{
return;
}
}
我有12个combobox，下拉菜单有12个选项，不可重复选择。重复时就弹出提示。现在 comboBox1.SelectedIndex = -1;这句我想实现自动清除然后重新选择，但是这也就触发了combobox的SelectedIndexChanged，造成提示连续弹出两次，，这怎么解决？？？？？

Answer 1

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) //压力探测01的接线通道号选择与其他通道号重复时不可选（下同）
{
if (checkBox1.Checked &&comboBox1.SelectedIndex >-1)
{
if (comboBox1.Text == comboBox2.Text | comboBox1.Text == comboBox3.Text | comboBox1.Text == comboBox4.Text
|comboBox1.Text == comboBox5.Text| comboBox1.Text == comboBox6.Text | comboBox1.Text == comboBox7.Text
|comboBox1.Text == comboBox8.Text | comboBox1.Text == comboBox9.Text| comboBox1.Text == comboBox10.Text
|comboBox1.Text == comboBox11.Text | comboBox1.Text == comboBox12.Text)
{
comboBox1.SelectedIndex = -1;
MessageBox.Show("此通道号已被选择，请更换！");
}
}
else
{
return;
}
}