Question

似乎有些东西被打破了...我的Web窗体应用程序中有一个asp文本框，它有一个必需的字段验证器。如果文本框为空，则显示验证程序，但也执行服务器代码，在这种情况下代码插入表中：

<div class="form-group">
            <asp:Label ID="lblPName" runat="server" CssClass="col-md-2 control-label" Text="Category Name"></asp:Label>
            <div class="col-md-3">
                <asp:TextBox ID="txtCategoryName" runat="server" CssClass="form-control"></asp:TextBox>
                <asp:RequiredFieldValidator ID="RequiredFieldValidator1" CssClass="text-danger" runat="server" ErrorMessage="This Field is required" ControlToValidate="txtCategoryName"></asp:RequiredFieldValidator>
            </div>
        </div>

按钮代码：

<div class="form-group">
            <div class="col-md-2"></div>
            <div class="col-md-6">
                <asp:Button ID="btnAddCategory" CssClass="btn btn-default" runat="server" Text="Add" onclick="btnAddCategory_Click" />
            </div>
        </div>

我的服务器端代码用于插入数据：

string cs = ConfigurationManager.ConnectionStrings["MyDatabaseConnectionString"].ConnectionString;
        using (SqlConnection con = new SqlConnection(cs))
        {
            SqlCommand cmd = new SqlCommand("Insert into tblCategories values(@CategoryName)", con);
            cmd.Parameters.AddWithValue("@CategoryName", txtCategoryName.Text);
            con.Open();
            cmd.ExecuteNonQuery();
            txtCategoryName.Text = string.Empty;
        }
        BindCategoryRepeater();

为什么会发生类似的事情？

Answer 1

在Button和RequiredFieldValidator中添加验证组：

 <asp:RequiredFieldValidator ID="RequiredFieldValidator1" CssClass="text-danger" runat="server" ErrorMessage="This Field is required" ValidationGroup="test" ControlToValidate="txtCategoryName"></asp:RequiredFieldValidator>

 <asp:Button ID="btnAddCategory" CssClass="btn btn-default" runat="server" Text="Add" onclick="btnAddCategory_Click" ValidationGroup="test"  />

Answer 2

参考：RequiredFieldValidator Class

在服务器端代码中添加带有Page.IsValid的if else

if(Page.IsValid)
{
    string cs = ConfigurationManager.ConnectionStrings["MyDatabaseConnectionString"].ConnectionString;
    using (SqlConnection con = new SqlConnection(cs))
    {
        SqlCommand cmd = new SqlCommand("Insert into tblCategories values(@CategoryName)", con);
        cmd.Parameters.AddWithValue("@CategoryName", txtCategoryName.Text);
        con.Open();
        cmd.ExecuteNonQuery();
        txtCategoryName.Text = string.Empty;
    }
    BindCategoryRepeater();
}
else
{
    //handle the error
}

验证器显示，但按钮执行服务器代码

2 个答案: