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[CLOSED] very strange null reference exception?

  1. #1
    Aug 01, 2013, 2:19 AM

    [CLOSED] very strange null reference exception? 

    <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm8.aspx.cs" Inherits="TobrosCWT.pages.pingzheng.WebForm8" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
</head>
<script runat="server">
       

    public class Company
    {
        public int ID { get; set; }
        public string Name { get; set; }
    }

    public List<Company> GetData()
    {
        return new List<Company>
                {
                    new Company{ID = 1,Name = "comp1"},
                    new Company{ID = 2,Name = "comp2"},
                };
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!X.IsAjaxRequest)
        {
            this.BindData();

        }
    }
    private void BindData()
    {
        this.store1.DataSource = GetData();
        this.store1.DataBind();
    }

    protected void clickme(object sender, DirectEventArgs e)
    {
        this.cc_bz.Show();
    }

</script>
<body>
    <form id="form1" runat="server">
        <ext:ResourceManager runat="server"></ext:ResourceManager>
        <ext:GridPanel runat="server" ID="gridpanel1" Height="100">
            <TopBar>

                <ext:Toolbar runat="server">
                    <Items>
                        <ext:Button runat="server" Text="show the column">
                            <DirectEvents>
                                <Click OnEvent="clickme"></Click>
                            </DirectEvents>
                        </ext:Button>
                    </Items>
                </ext:Toolbar>
            </TopBar>
            <ext:Store>
                <ext:Store runat="server" ID="store1">
                    <Model>
                        <ext:Model runat="server" IDProperty="ID">
                            <Fields>
                                <ext:ModelField Name="ID" Type="Int" />
                                <ext:ModelField Name="Name" />

                            </Fields>
                        </ext:Model>
                    </Model>
                </ext:Store>

            </ext:Store>
            <ColumnModel ID="ColumnModel1" runat="server">
                <Columns>
                    <ext:Column runat="server" DataIndex="ID" Text="ID"></ext:Column>
                    <ext:Column ID="Column1" runat="server" DataIndex="Name" Text="NAME"></ext:Column>

                    <ext:ComponentColumn Hidden="true" ID="cc_bz" runat="server" Align="Right" Text="币别" DataIndex="bizhong" Editor="True" Width="230">
                        <Component>
                            <ext:Container ID="Container3" runat="server" Layout="HBoxLayout">
                                <Items>

                                    <ext:ComboBox ID="ComboBox1" runat="server" ItemID="Currency" InputWidth="60">
                                        <Items>
                                            <ext:ListItem Text="USD" Value="1" Mode="Raw" />
                                            <ext:ListItem Text="EURO" Value="2" Mode="Raw" />
                                        </Items>
                                    </ext:ComboBox>
                                    <ext:TextField runat="server" InputWidth="60"></ext:TextField>
                                    <ext:TextField runat="server" FieldLabel="原币" LabelWidth="40" InputWidth="50"></ext:TextField>
                                </Items>
                            </ext:Container>
                        </Component>

                    </ext:ComponentColumn>
                </Columns>
            </ColumnModel>
        </ext:GridPanel>
    </form>
</body>
</html>
    this.store1 throws null reference exception, but I have defined the store1 in the gridpanel, why?
    Last edited by Daniil; Aug 06, 2013 at 9:28 AM. Reason: [CLOSED]
  2. #2
    Aug 01, 2013, 3:04 AM
    Hello!

    There is a typo in Store declaration. You have:

    <ext:Store>
	<ext:Store runat="server" ID="store1">
    Should be:

    <Store>
	<ext:Store runat="server" ID="store1">
    Here is the full sample:

    <%@ Page Language="C#" %>

<%@ Register assembly="Ext.Net" namespace="Ext.Net" tagprefix="ext" %>
 
<!DOCTYPE html>
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
</head>
<script runat="server">
        
 
    public class Company
    {
        public int ID { get; set; }
        public string Name { get; set; }
    }
 
    public List<Company> GetData()
    {
        return new List<Company>
                {
                    new Company{ID = 1,Name = "comp1"},
                    new Company{ID = 2,Name = "comp2"},
                };
    }
 
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!X.IsAjaxRequest)
        {
            this.BindData();
 
        }
    }
    private void BindData()
    {
        this.store1.DataSource = GetData();
        this.store1.DataBind();
    }
 
    protected void clickme(object sender, DirectEventArgs e)
    {
        this.cc_bz.Show();
    }
 
</script>
<body>
    <form id="form1" runat="server">
        <ext:ResourceManager runat="server"></ext:ResourceManager>
        <ext:GridPanel runat="server" ID="gridpanel1" Height="100">
            <TopBar>
 
                <ext:Toolbar runat="server">
                    <Items>
                        <ext:Button runat="server" Text="show the column">
                            <DirectEvents>
                                <Click OnEvent="clickme"></Click>
                            </DirectEvents>
                        </ext:Button>
                    </Items>
                </ext:Toolbar>
            </TopBar>
            <Store>
                <ext:Store runat="server" ID="store1">
                    <Model>
                        <ext:Model runat="server" IDProperty="ID">
                            <Fields>
                                <ext:ModelField Name="ID" Type="Int" />
                                <ext:ModelField Name="Name" />
 
                            </Fields>
                        </ext:Model>
                    </Model>
                </ext:Store>
            </Store>
            <ColumnModel ID="ColumnModel1" runat="server">
                <Columns>
                    <ext:Column runat="server" DataIndex="ID" Text="ID"></ext:Column>
                    <ext:Column ID="Column1" runat="server" DataIndex="Name" Text="NAME"></ext:Column>
 
                    <ext:ComponentColumn Hidden="true" ID="cc_bz" runat="server" Align="Right" Text="币别" DataIndex="bizhong" Editor="True" Width="230">
                        <Component>
                            <ext:Container ID="Container3" runat="server" Layout="HBoxLayout">
                                <Items>
 
                                    <ext:ComboBox ID="ComboBox1" runat="server" ItemID="Currency" InputWidth="60">
                                        <Items>
                                            <ext:ListItem Text="USD" Value="1" Mode="Raw" />
                                            <ext:ListItem Text="EURO" Value="2" Mode="Raw" />
                                        </Items>
                                    </ext:ComboBox>
                                    <ext:TextField runat="server" InputWidth="60"></ext:TextField>
                                    <ext:TextField runat="server" FieldLabel="原币" LabelWidth="40" InputWidth="50"></ext:TextField>
                                </Items>
                            </ext:Container>
                        </Component>
                    </ext:ComponentColumn>
                </Columns>
            </ColumnModel>
        </ext:GridPanel>
    </form>
</body>
</html>

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