webforms文本输入=>双字符串和布尔值

您可以使用比较验证器验证文本框,然后如果页面通过验证,则使用double.parse方法。

<asp:TextBox ID="txtDouble" runat="server"></asp:TextBox>
    <asp:CompareValidator ID="CompareValidator1" runat="server" 
        ErrorMessage="Input must contain a double." ControlToValidate="txtDouble" 
        Operator="DataTypeCheck" SetFocusOnError="True" Type="Double"></asp:CompareValidator>
<br />
<asp:Button ID="btnSubmit" runat="server" Text="Submit" />

/*C#*/
protected void btnSubmit_Click(object sender, EventArgs e)
{
    if (Page.IsValid)
    {
        double d = double.Parse(txtDouble.Text);
    }
}