[英]MaskedTextBox Minimum/Maximum Lengths
I have a masked textbox with the need to have a min/max length set on them. 我有一个蒙版文本框,需要在其上设置最小/最大长度。 When these conditions are met a button becomes enabled.
当满足这些条件时,将启用一个按钮。
I was thinking of handling the TextChanged event to determine the length of the entered text and set the buttons enabled value. 我正在考虑处理TextChanged事件,以确定输入的文本的长度并设置按钮的启用值。
Is there a better approach? 有没有更好的方法?
btnOK.Enabled = txtDataEntry.Text.Length >= MinDataLength && txtDataEntry.Text.Length <= MaxDataLength;
// At your texbox valdating Event //在您的texbox评估活动中
private void textBox4_Validating(object sender, CancelEventArgs e)
{
TextBox tb = sender as TextBox;
if (tb != null)
{
int i=tb.Text.Length;
//Set your desired minimumlength here '7'
if (i<7)
{
MessageBox.Show("Too short Password");
return;
}
}
else
e.Cancel = true;
}
IMO TextChanged event is good place to handle this feature condition. IMO TextChanged事件是处理此功能状况的好地方。
Update 更新资料
Do it in KeyPress event like this: 在KeyPress事件中执行以下操作:
maskedtxtbox.KeyPress => (s , ev ) {
if(maskedtxtbox.Length > 9)
{
//This prevent from key to go to control
e.Handled =true;
button1.Enabled = true;
}
};
哪种方法甚至比您建议的简单?
myTextBox.Textchanged+=(s,o)=>{ myButton.Enabled = myTextBox.Length==10; };
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