格式化数字保留N位小数 System.Globalization.NumberFormatInfo provider = new System.Globalization.NumberFormatInfo(); provider.NumberDecimalDigits =intDecLength; //要设定的小数位数 double strCashAmt=Convert.ToDouble(this.txtCashAmt.Text); //先把控件內的值转成double this.txtCashAmt.Text = strCashAmt.ToString("N",provider); //再利