阻止用户在不向数据库表添加数据的情况下继续
本文关键字:数据 添加 情况下 继续 数据库 用户 | 更新日期: 2023-09-27 18:22:06
我在ASP.net中创建了一个使用MultiView
控件的注册向导,其中有多个View
控件。下面是一个View
控件的示例;
<asp:View ID="address_view" runat="server">
<h1>Address:</h1>
<asp:Button ID="add_new_address" CssClass="blue" runat="server" Text="Add New Address" OnClick="add_new_address_Click" />
<div id="add_address_div" runat="server">
<asp:DropDownList ID="address_dropdown_insert" runat="server">
<asp:ListItem Value="Home">Home Address</asp:ListItem>
<asp:ListItem Value="Term">Term Time Address</asp:ListItem>
<asp:ListItem Value="Mail">Mail Address</asp:ListItem>
<asp:ListItem Value="Business">Business Address</asp:ListItem>
</asp:DropDownList><br />
Address 1:
<asp:TextBox Text="" runat="server" ID="address_1TextBox" /><br />
Address 2:
<asp:TextBox Text="" runat="server" ID="address_2TextBox" /><br />
Town/City:
<asp:TextBox Text="" runat="server" ID="town_cityTextBox" /><br />
County:
<asp:TextBox Text="" runat="server" ID="countyTextBox" /><br />
PostCode:
<asp:TextBox Text="" runat="server" ID="postcodeTextBox" /><br />
Country:
<asp:TextBox Text="" runat="server" ID="countryTextBox" />
<asp:Button runat="server" CommandName="Insert" Text="Insert" ID="InsertButton" OnClick="insert_address_button_Click" />
<asp:Button runat="server" CommandName="Cancel" Text="Clear" ID="Button4" OnClick="cancel_address_button_Click" /><br />
</div>
<asp:ListView ID="address_list" runat="server" DataSourceID="user_address" DataKeyNames="address_id">
<EditItemTemplate>
// code here
</EditItemTemplate>
<EmptyDataTemplate>
<br />
<p>There are currently no addresses found, please click the button above to add a new address.</p>
</EmptyDataTemplate>
<ItemTemplate>
//code here
</ItemTemplate>
<LayoutTemplate>
//code here
</LayoutTemplate>
</asp:ListView>
<br />
<asp:Button CommandName="NextView" ID="Button1" runat="server" Text="Next" />
</asp:View>
插入表单插入到的数据库表名为address
。它有以下字段
address_id
user_id
address_type
address_1
address_2
town_city
county
postcode
country
user_id
是从另一个名为users
的表中提取的。
我有以下C#来获取当前登录用户的user_id
;
//get id of logged in user
string user_id = Session["user_id"].ToString();
我的问题是,如果用户的user_id
没有出现在address
表中,当他们单击Button1
时,我如何防止他们继续进入下一个视图?
我是C#的新手,所以如果有任何帮助,我将不胜感激。
在输入地址之前,您将希望禁用Button1。最初您的按钮1标记将包括Enabled="false"
<asp:Button CommandName="NextView" Enabled="false" ID="Button1" runat="server" Text="Next" />
然后,在insert_address_button_Click处理程序中,成功添加地址后,启用按钮,如下所示:
protected void insert_address_button_Click(object sender, EventArgs e)
{
// ..insert the address. If successful, enable the "Next" button
Button1.Enabled = true;
}
这是一个简单的方法,但应该按照你的要求去做。
编辑:要在用户中寻址按钮1的状态,请返回地址视图:
protected void Page_Load(object sender, EventArgs e)
{
Button1.Enabled = address_list.Items.Any();
}