单击组合框时，文本框的颜色发生变化 [英] text box color change when click the combobox

问题描述

任何人都可以帮助我解决这个问题吗
当我从组合框中选择一个项目时，当数量小于5时，如何更改文本框的底色(用于显示数量).

Can any body help me to solve this
when i select a item from combobox how can i change the back color of my text box(used to show quantity) when the quantity became less than 5 .

推荐答案

''与我以前的答案基本相同:(数量取自文本框，也可以通过将textBox2.Text替换为comboBox1.SelectedItem.ToString()来取自组合框)

That'' basically the same as my previous answer: (quantity is taken from the textBox, but can also be taken from the combobox by replacing textBox2.Text with comboBox1.SelectedItem.ToString())

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
  int quantity = 0;
  if (!Int32.TryParse(textBox2.Text, out quantity))
  {
    textBox2.BackColor = Color.Red;
    return;
  }
  if (quantity < 5)
    textBox2.BackColor = Color.Green;
  else
    textBox2.BackColor = Color.White;
}

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