
项目中经常看到在输入金额时,会加逗号,最近在复习正则表达式,就联系下,界面如下:
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X6AACc+DV9atru8EX6AACc+DV9Lt68yxfpAwBwgvRxIeB/5hbCCaWfPsg6o01/8y7f5yB9AAAvADqjzdB+ly/SBwAgBTqjrbbjLl+kDwBACnRGW23HPb5IHwCAFOiMtksd9/gifQAAUqAz2i533uOL9AEASIHOaKv77j5fpA8AQAp0RtuV7+7zRfoAIAXMi8sY74DOaKvvvs8X6QOAFIz9U/p8Mc70ecAX6QOAFDAMc/9FZFzp03DrAV+kDwBSgPTRGW3Xbj3gi/QBQAoYhrknEoQQbuCG7/X+YFzpc73ne75IHwCkQMT0uecIFLdY4R+OZSwK40qfG73f80X6ACAFDMPcFRvPZx/+qVHHooD0AeBZh2GYO2JDCBE6HMtYFMaVPkbT93yRPgBIgVjpwz3m8Mf8SbdlPtaIwrjSp7lvmC/SBwApYBjmtngQQtxe+fNeF/uJcaVPS98wX6QPAFLAMIxNPAgh3KvnodfFfmJ86dM/zBfpA4AU+C99PKPHLW58Hz4l40qfVvNwq3m4zTxCB0gfAKSAYZgh8SCE0Fc64E/yB2M5fErGlT43zSN8kT4ASAHDMFbxIIRwr26TPua9Hj4l40ufgRG+SB8ApEDE9PEaPW4LfCPWlVjHmT7tAyN8kT4ASAHDMBYxIITwx56Ma4enZ1zp0zE40jE40j44QgdIHwCkgGGYwReRcaVP5+DDTsvDzkG7SB8ApADpozPaOi0P+SJ9AJAChmEGXkTGlT7fWR7yRfoAIAVIH53R1mV9yBfpA4AU+O/PKgecMd4BpA8AIDAgfQAAgUFntHVZ/5cv0gcAIAU6o63NPMIX6QMAkAKd0Xap8x7n5c57RGe0QQih9CJ9IISBEekDIQyMSB8IYWBE+kAIA+P/A8KO1a7NKtNLAAAAAElFTkSuQmCC" 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首先,对上面的文本框输入值进行控制,只允许用户输入数字0-9,小数点和退格键,注册文本框的KeyPress事件,代码如下:
//输入值只能在数字0-9之间,允许输入小数点和退格键
if ((e.KeyChar < '' || e.KeyChar > '') && e.KeyChar != && e.KeyChar != )
{
e.Handled = true;
} //第一位不能是0
if (txtMoney.SelectionStart==&&e.KeyChar=='')
{
e.Handled = true;
}
我想在光标离开文本框(其不再是窗体上的活动控件时,给用户输入值加逗号,注册Leave事件),代码如下:
#region 光标离开时加上逗号
string sMsg = txtMoney.Text.Trim();
if (!string.IsNullOrEmpty(sMsg))
{
txtMoney.Text = Regex.Replace(sMsg, @"(?<=\d)(?=(\d{3})+(?!\d))", ",");
}
#endregion
代码中用到了正则表达式中的“环视”。
最后,在移入光标(文本框成为窗体的活动控件时,删除添加的逗号,注册Enter事件),代码如下:
#region 光标移入时删除逗号
string sMsg = txtMoney.Text.Trim();
if (!string.IsNullOrEmpty(sMsg))
{
txtMoney.Text = sMsg.Replace(",", string.Empty);
}
#endregion
主要是复习下对环视的应用。