[英]How to enable a button that is disabled based on textBox? c#
I got a textBox that load value from my database and a button that update changes based on the value of the textBox. 我有一个从数据库中加载值的textBox,还有一个根据textBox的值更新更改的按钮。 What I need is to enabled the button if the textBox value changed.
我需要的是在textBox值更改的情况下启用按钮。 For example, the value that the textBox loads is 3 if I also input again 3 in the textBox the button will still be disable.
例如,如果我也再次在textBox中输入3,则textBox加载的值为3,该按钮仍将被禁用。 The button will only enabled if I changed the value for example to 4 or any number but not 3.
仅当我将值更改为4或任何数字但未更改为3时,该按钮才会启用。
Cache the original value somewhere then compare in the TextChanged Event 将原始值缓存到某个地方,然后在TextChanged事件中进行比较
private void textBox1_TextChanged(object sender, EventArgs e)
{
if (textBox1.Text == OriginalValue)
{
button1.Enabled = false;
}
else
{
button1.Enabled = true;
}
}
Alternatively, you could just do this (see CodesInChaos' comment below): 或者,您可以执行此操作(请参见下面的CodesInChaos评论):
private void textBox1_TextChanged(object sender, EventArgs e)
{
button1.Enabled = textBox1.Text != OriginalValue;
}
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