<asp:TextBox ID="txtTotalQuantity" runat="server" Width="25%"></asp:TextBox>

<asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ControlToValidate="txtTotalQuantity"
ErrorMessage="只能填入数字和小数" ValidationExpression="^[0-9][0-9]{0,2}(?:,?[0-9]{3})*(?:\.[0-9]{1,2})?$"></asp:RegularExpressionValidator>

<asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ControlToValidate="txtTotalQuantity"
ErrorMessage="只能填入数字和小数" ValidationExpression="^[0-9][0-9]{0,2}(?:,?[0-9]{3})*(?:\.[0-9]{1,2})?$"></asp:RegularExpressionValidator>

C# .net 在前端页面进行 文本框的验证