c尖锐的Windows应用程序，文本框也应像2.3一样接受 [英] c sharp windows application ,the textbox should accepts like 2.3 likewise

问题描述

文本框应像2.3一样接受

the textbox should accepts like 2.3 likewise

推荐答案

TextBox 控件的KeyDown 事件可用于此目的.按下0 to 9， .和back space以外的键时，SuppressKeyPress 属性设置为True，这将阻止按下的键传递给TextBox，如下所示

The KeyDown event of TextBox control can be used for this purpose. When a key other than 0 to 9, . and back space is pressed the SuppressKeyPress property is set to True, which blocks the key pressed being passed to the TextBox, as shown below

void Main()
{
    Form form1 = new Form();
    TextBox textBox1 = new TextBox();
    textBox1.KeyDown += (sender, args) => {
    	if(args.KeyCode==Keys.Back || args.KeyCode==Keys.OemPeriod) return;
    	 
    	if((args.KeyValue < (int)'0' || args.KeyValue > (int)'9'))
    		args.SuppressKeyPress = true;
    	
    };
    form1.Controls.Add(textBox1);
    form1.ShowDialog();
}

但是最好使用MaskedTextBox ，这在这里进行了解释，
http://msdn.microsoft.com/en-us/library/system. windows.forms.maskedtextbox.aspx [ ^ ]
出于指定的目的.

But it is preferable to use MaskedTextBox , which is explained here,
http://msdn.microsoft.com/en-us/library/system.windows.forms.maskedtextbox.aspx[^]
for the purpose specified.

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