c# - 如何验证表单，以便如果缺少字段或未正确填写表单将返回 false

Question

我的 ASP.net 页面中有以下表单:

<asp:UpdatePanel runat="server" ClientIDMode="Static" ID="upReg" UpdateMode="Conditional">
        <ContentTemplate>
            <div class="dvHolder hidOverflow clearfix">
                <input id="txtFirst" type="text" name="login" value="" placeholder="First Name" runat="server" />
                <asp:Label Text="" runat="server" ID="lblRFName" CssClass="lblStyle" />
            </div>
            <div class="dvHolder hidOverflow clearfix">
                <input id="txtLast" type="text" name="login" value="" placeholder="Last Name" runat="server" />
                <asp:Label Text="" runat="server" ID="lblRLName" CssClass="lblStyle" />
            </div>
            <div class="dvHolder hidOverflow clearfix">
                <input id="txtEmail" type="text" name="login" value="" placeholder="Email Address" runat="server" />
                <asp:Label Text="" runat="server" ID="lblREmail" CssClass="lblStyle" />
            </div>
            <div class="dvHolder hidOverflow clearfix">
                <input id="txtUser" type="text" name="login" value="" placeholder="Username" runat="server" />
                <asp:Label Text="" runat="server" ID="lblRUser" CssClass="lblStyle" />
            </div>
            <div class="dvHolder hidOverflow clearfix">
                <input id="txtPass" type="password" name="login" value="" placeholder="Password" runat="server" />
                <asp:Label Text="" runat="server" ID="lblRPass" CssClass="lblStyle" />
            </div>
            <div class="dvHolder hidOverflow clearfix">
                <input id="txtPassC" type="password" name="login" value="" placeholder="Confirm Password" runat="server" />
                <asp:Label Text="" runat="server" ID="lblRPassC" CssClass="lblStyle" />
            </div>
            <div class="dvHolder hidOverflow clearfix setTextRight">
                <asp:Button ID="btnRegister" ClientIDMode="Static" runat="server" Text="Register" OnClick="btnRegister_Click" />
                <asp:Label runat="server" Text="" ID="lblSuccess" ClientIDMode="Static" />
            </div>
        </ContentTemplate>
    </asp:UpdatePanel>
</div>

代码隐藏:

public void btnRegister_Click(object sender, EventArgs e)
{
    if (txtFirst.Value == "")
    {
        lblRFName.Text = "Please enter your first name";
        blnFrmComplete = false;
    }
    else
    {
        lblRFName.Text = "";
        blnFrmComplete = true;
    }
    if (txtLast.Value == "")
    {
        lblRLName.Text = "Please enter your last name";
        blnFrmComplete = false;
    }
    else
    {
        lblRLName.Text = "";
        blnFrmComplete = true;
    }
    if (txtEmail.Value == "")
    {
        lblREmail.Text = "Please enter your email address";
        blnFrmComplete = false;
    }
    else
    {
        if (!(IsValidEmail(txtEmail.Value)))
        {
            lblREmail.Text = "Please enter a valid email address";
            blnFrmComplete = false;
        }
        else
        {
            if (UserExistsWithEmail()) //function to check if email account already exists
            {
                lblREmail.Text = "The email already has an account";
                blnFrmComplete = false;
            }
            else
            {
                lblREmail.Text = "";
                blnFrmComplete = true;
            }
        }
    }
    if (txtUser.Value == "")
    {
        lblRUser.Text = "Please enter a desired username";
        blnFrmComplete = false;
    }
    else
    {
        if (UserExistsWithUsername()) //function to check if username already exists
        {

        }
        else
        {
            lblRUser.Text = "";
            blnFrmComplete = true;
        }
    }
    if (txtPass.Value == "")
    {
        lblRPass.Text = "Please enter a password";
        blnFrmComplete = false;
    }
    else
    {
        if (txtPassC.Value != "" && txtPass.Value == txtPassC.Value)
        {
            lblRPass.Text = "";
            blnFrmComplete = true;
        }
        else
        {
            lblRPass.Text = "Password do not match";
            blnFrmComplete = false;
        }
    }
    if (txtPassC.Value == "")
    {
        if (txtPass.Value != "")
        {
            lblRPassC.Text = "Please confirm your password";
            blnFrmComplete = false;
        }
        else
        {
            lblRPassC.Text = "Please enter your confirmed password";
            blnFrmComplete = false;
        }
    }
    else
    {
        if (txtPass.Value != "" || txtPass.Value == txtPassC.Value)
        {
            lblRPassC.Text = "";
            blnFrmComplete = true;
        }
        else
        {
            lblRPassC.Text = "Confirm password do not match";
            blnFrmComplete = false;
        }
    }

    if (blnFrmComplete == true)
    {
        CreateNewUser();
    }
    upReg.Update();
}

我遇到的问题是因为它是按顺序进行的，如果我缺少电子邮件地址但密码正确，它将返回 true。

我如何修改代码，以便如果任何字段丢失或未正确填写，blnFrmComplete 将为 false，其余代码将不会被检查。

Answer 1

与其将你的 blnFrmComplete 设置为 true，不如将其保留为 true，并让他们仅在以下情况下将其更改为 false有些东西是无效的。什么都不应该将其设置回 true。

因此，您的 bool 值一开始就设置为 true，只有在某些内容无效时才将其切换为 false。如果没有任何内容无效，那么您的 bool 值仍然为真。