Question

我只是在玩Visual Studio 2012并尝试使用本地SQL Server数据库创建一个非常简单的newssite。问题是RequiredFieldValidator不在文本框上工作。即使这些框是空的，数据库仍然会使用空记录进行更新，我只是不知道为什么验证器在VS2010中工作正常。如果按下提交按钮，则会显示错误，但数据库仍会使用空记录进行更新。有谁知道为什么？我在表单的C＃文件中使用ScriptResourceMapping，如果这有任何区别的话。

这是我的代码：

 <section id="addnews_panel">
        <h2>Rubrik</h2>
        <asp:TextBox ID="txtHeadlineForm1" runat="server" Width="332px" CausesValidation="True" ValidationGroup="newsForm"></asp:TextBox>
        <br />
        <asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" ControlToValidate="txtHeadlineForm1" ErrorMessage="Write something" ValidationGroup="newsForm"></asp:RequiredFieldValidator>
        <h2>Rubrik 2</h2>
        <asp:TextBox ID="txtHeadlineForm2" runat="server" Width="328px" CausesValidation="True" ValidationGroup="newsForm"></asp:TextBox>
        <br />
        <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ControlToValidate="txtHeadlineForm2" ErrorMessage="Write something" ValidationGroup="newsForm"></asp:RequiredFieldValidator>
        <h2>Ingress</h2>
        <asp:TextBox ID="txtIngressForm" runat="server" Height="99px" TextMode="MultiLine" Width="325px" CausesValidation="True" ValidationGroup="newsForm"></asp:TextBox>
        <br />
        <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="txtIngressForm" ErrorMessage="Write something" ValidationGroup="newsForm"></asp:RequiredFieldValidator>
        <h2>Nyhet</h2>
        <asp:TextBox ID="txtNewsForm" runat="server" Height="288px" TextMode="MultiLine" Width="507px" CausesValidation="True" ValidationGroup="newsForm"></asp:TextBox>
        <br />
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txtNewsForm" ErrorMessage="Write something" ValidationGroup="newsForm"></asp:RequiredFieldValidator>

        <br />
        <asp:Button ID="btnAddNews" runat="server" Text="Lägg till nyhet" OnClick="btnAddNews_Click" ValidationGroup="newsForm" />

        <h2>

        <asp:Label ID="lblResult" runat="server"></asp:Label>

        </h2>

    </section>



protected void btnAddNews_Click(object sender, EventArgs e)
    {

            using (dbnewsEntities db = new dbnewsEntities())
            {
                var addNews = new tblNews();
                addNews.headline = txtHeadlineForm1.Text;
                addNews.headline2 = txtHeadlineForm2.Text;
                addNews.ingress = txtIngressForm.Text;
                addNews.news = txtNewsForm.Text;
                addNews.date = DateTime.Now.ToString();
                db.tblNews.Add(addNews);
                db.SaveChanges();
            }

            lblResult.Text = "News added!";



    }

Answer 1

您需要包含ScriptManager来执行此验证客户端：

<asp:ScriptManager />

或者您需要在回发后专门检查页面是否有效：

if(Page.IsValid)
{
    using (dbnewsEntities db = new dbnewsEntities())
    {
        var addNews = new tblNews();
        addNews.headline = txtHeadlineForm1.Text;
        addNews.headline2 = txtHeadlineForm2.Text;
        addNews.ingress = txtIngressForm.Text;
        addNews.news = txtNewsForm.Text;
        addNews.date = DateTime.Now.ToString();
        db.tblNews.Add(addNews);
        db.SaveChanges();
    }
}

Answer 2

您必须始终在服务器端进行验证，以防绕过客户端验证（即JavaScript已关闭）。要验证服务器端，请尝试以下操作：

protected void btnAddNews_Click(object sender, EventArgs e)
{
    // Only save to the database and update UI if the page is valid
    if (Page.IsValid)
    {
        using (dbnewsEntities db = new dbnewsEntities())
        {
            var addNews = new tblNews();
            addNews.headline = txtHeadlineForm1.Text;
            addNews.headline2 = txtHeadlineForm2.Text;
            addNews.ingress = txtIngressForm.Text;
            addNews.news = txtNewsForm.Text;
            addNews.date = DateTime.Now.ToString();
            db.tblNews.Add(addNews);
            db.SaveChanges();
        }

        lblResult.Text = "Nyhet sparad!";
    }
}

如果您发现页面验证失败，另一种方法是摆脱该方法，如下所示：

protected void btnAddNews_Click(object sender, EventArgs e)
{
    // If the page is invalid, then return from the method
    if (!Page.IsValid)
    {
        return;
    }

    using (dbnewsEntities db = new dbnewsEntities())
    {
        var addNews = new tblNews();
        addNews.headline = txtHeadlineForm1.Text;
        addNews.headline2 = txtHeadlineForm2.Text;
        addNews.ingress = txtIngressForm.Text;
        addNews.news = txtNewsForm.Text;
        addNews.date = DateTime.Now.ToString();
        db.tblNews.Add(addNews);
        db.SaveChanges();
    }

    lblResult.Text = "Nyhet sparad!";
}

我个人喜欢第一种保存方法，如果事情是有效的，因为第二种方法需要做的第一件事就是检查页面无效并挽救（阅读：返回）。每个人都有自己的。

Answer 3

你应该使用

的ValidationGroup = “newsForm” on RequiredFieldValidator字段和Button控件不在文本框控件中使用。

可能是你的问题已经解决，而且RequiredFieldValidator正常工作。

RequiredFieldValidator不会阻止数据库使用空行进行更新 - Visual Studio 2012

3 个答案: