如果输入的登录电子邮件地址(用户名)已存在于数据库中,我已编写自定义验证以防止用户将信息保存在数据库中。
<div class="span3">
<asp:TextBox ID="txtLoginEmailAddress" class="SearchTxtBox" runat="server" Text='<%# ds.Tables[0].Rows[0]["LoginEmailAddress"] %>'
MaxLength="50"> </asp:TextBox>
</div>
<div class="span6">
<asp:RequiredFieldValidator ID="valLoginEmailAddressRequired" runat="server" CssClass="Validator"
ValidationGroup="save" Display="Dynamic" ControlToValidate="txtLoginEmailAddress"
ErrorMessage="<b>User Name is required</b>"></asp:RequiredFieldValidator>
<asp:CustomValidator ID="CheckAvailablity" runat="server" ValidationGroup="save" ControlToValidate="txtLoginEmailAddress"
OnServerValidate="ValidateUserName"></asp:CustomValidator>
<asp:Label ID="valDuplicatePassword" runat="server" style="color:red" Visible="False"></asp:Label></td>
</div>
<asp:Button ID="btnSave" runat="server" Text="Save" CssClass="btn btn-small " OnClick="btnSave_Click"
ValidationGroup="save" />
在cs文件中
protected void ValidateUserName(object sender, ServerValidateEventArgs e)
{
SystemUserBL bl = new SystemUserBL(SessionContext.SystemUser);
ds = new DataSet();
bl.FetchForLoginEmailAddress(ds, txtLoginEmailAddress.Text);
if (ds.Tables[0].Rows.Count > 0)
{
e.IsValid = false;
valDuplicatePassword.Visible = true;
valDuplicatePassword.Text = "<b>This User Name is already in use by another user.</b>";
btnSave.Enabled = false;
btnSaveclose.Enabled = false;
}
else
{
e.IsValid = true;
btnSave.Enabled = true;
btnSaveclose.Enabled = true;
valDuplicatePassword.Visible = true;
valDuplicatePassword.Text = "<b>Congratulations! " + txtLoginEmailAddress.Text + " is available.</b>";
}
}
protected void btnSave_Click(object sender, EventArgs e)
{
try
{
if (save())
{
SucessMessage();
}
}
catch (Exception ee)
{
ErrorMessage(ee.Message);
}
}
现在,当我们点击“保存”按钮时,它会在将数据保存到数据库后显示验证消息。我希望它不应该保存在数据库中,自定义验证应该像其他ASP.NET的验证一样工作。请帮忙!!!
答案 0 :(得分:1)
在继续处理之前,您必须明确检查页面是否有效。所以在你的情况下:
protected void btnSave_Click(object sender, EventArgs e)
{
try
{
if (this.IsValid()) //this checks that the page passed validation, including custom validation
{
if (save())
{
SucessMessage();
}
}
else
{
//any custom error message (additional to the validators themselves) should go here
}
}
catch (Exception ee)
{
ErrorMessage(ee.Message);
}
}
严格来说,这适用于所有ASP.NET验证程序,但尤其是在您未使用客户端验证的情况下,您更有可能遇到此问题。即使您的验证器确实启用了客户端,您也应该进行此检查 - 恶意用户很容易绕过客户端验证并提交无效数据。
有关此主题的更详细讨论,请参阅此博客:https://www.jardinesoftware.net/2012/03/31/net-validators-dont-forget-page-isvalid/