DropDownList with Invalid SelectedValue because it does not exist in the list of items

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DropDownList with Invalid SelectedValue because it does not exist in the list of items

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#1 by (1 votes)

1

I can not understand what's wrong. DropDown is in a Formview of a user control. The dropDown binds to a database table that should return 2 id and name values

FormView

 <td><asp:DropDownList width="350px"
 ID="EntregaRegiaoDropDownList" runat="server" SelectedValue='<%# Bind ("Regiao") %>' DataSourceID ="SqlDataSource1" DataTextField ="RegiaoNome" DataValueField ="RegiaoID" Enabled ="False"></asp:DropDownList></td>

Code behind userControl.ascx

public bool Editable
{
    get 
    {
        if (ViewState["editable"] != null)
        {
            return (bool)ViewState["editable"];
        }
        else
        {
            return true;
        }
    }
    set 
    {
        ViewState["editable"] = value;
    }
}
protected override void OnPreRender(EventArgs e)
{
    //Find o botao edit visible
    Button EditButton=
        FormView1 .FindControl ("EditButton") as Button;
    if (EditButton !=null )
    {
        EditButton .Visible =Editable ;
    } 
}

DropDownList 'has a SelectedValue which is invalid because it does not   exist in the list of items. Parameter name: value

Exception Details: System.ArgumentOutOfRangeException:   'DeliveryRegiaoDropDownList' has a SelectedValue which is invalid   because it does not exist in the list of items. Parameter name: value

Source Error:

Line 30: {

Line 31: // Find the visible edit button

Line 32: Button EditButton =

Line 33: FormView1 .FindControl ("EditButton") as Button;

Line 34: if (EditButton! = null)

Source File: c: \ Users \ PC \ Documents \ Visual Studio

2012 \ WebSites \ BaumSGVO \ UserControls \ ClientsDetails.ascx.cs Line:   32

Stack Trace:

[ArgumentOutOfRangeException: 'DeliveryRegiaoDropDownList' has a   SelectedValue which is invalid because it does not exist in the list   of items. Parameter name: value]

c# asp.net

asked by anonymous 25.04.2014 / 11:20

1 answer

Call in Ajax How to write what is received in an Apache port right in mySQL?

score 1 · Accepted Answer

 <td>
   <asp:DropDownList width="350px" ID="EntregaRegiaoDropDownList" runat="server"
     SelectedValue='<%# Bind ("Regiao") %>' //VALOR ATRELADO = REGIAO
     DataSourceID="SqlDataSource1" 
     DataTextField="RegiaoNome" 
     DataValueField="RegiaoID"              //VALOR DO VALUE = REGIAOID
     Enabled="False"></asp:DropDownList>
 </td>

You should instead use the SelectedValue property at the time of editing a form, please note that you DataValueField as RegiaoID and < strong> SelectedValue only places Region , this makes it impossible for the application to run because it is set to different fields , put < strong> RegiaoID and also run again, which should solve, now for better control, I suggest you use the SelectedValue property directly in codebehind. Home Remember that you can only select the value 'matching' the RegionID = RegiaoID fields.

ERROR:
SelectedValue = '<% # Bind ("Region")% >'