string str = "1234";
double resNum;
bool isNum = Double.TryParse( str, NumberStyles.Number, NumberFormatInfo.InvariantInfo, out resNum );
double resNum;
bool isNum = Double.TryParse( str, NumberStyles.Number, NumberFormatInfo.InvariantInfo, out resNum );
如:if(button is System.Forms.Button)
{
MessageBox.Show("是");
}
else
{
MessageBox.Show("不是");
}
NumberFormatInfo.InvariantInfo
在那个命名空间内?
NumberFormatInfo.InvariantInfo
在那个命名空间内?
System.Globalization 命名空间ms-help://MS.VSCC/MS.MSDNVS.2052/cpref/html/frlrfSystemGlobalizationNumberStylesClassTopic.htm