EntityDataSource Null Update Parameters Not Getting Marked Modified
Feb 24, 2011
I am using an EntityDataSource with a FormView on VB.NET application. The FormView contains an AjaxControlToolKit TabContains with multiple tabs. Due to the fact that each tab is a naming container, Bind doesn't work properly for updating values (as discovered from reading other posts on stackoverflow). I instead have to declare UpdateParameters on my EntityDataSource. Example markup is as follows:
<asp:FormView ID="fv" runat="server" DataSourceID="eds" DataKeyNames="ID">
<EditItemTemplate>
<asp:TabContainer ID="tc" runat="server">
<asp:TabPanel ID="tp" runat="server" HeaderText="Tab 1">
[Code]....
This works great, until a customer is edited and their name is set to nothing (assuming in this case, a null name is allowed). The Name UpdateParameter is set to Null but the ObjectStateEntry is not set to modified for Null properties, even if previously the Entity had a value specified. As long as the name is changed to something other than Null, everything is updated correctly.
I found a workaround by putting the following code in the Updating event of the EntityDataSource.
Dim ose As ObjectStateEntry = context.ObjectStateManager.GetObjectStateEntry(action)
For Each p As Parameter In eds.UpdateParameters
ose.SetModifiedProperty(p.Name)
Next
This makes sure that each property in the UpdateParameters has its state set to modified. It works, but it seems like a hack and I can see it causing problems down the road. Is there anything else I could do?
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[Code]....
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[code]...
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[Code]....
Stack Trace:
[Code]....
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[Code] ....
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<
"
asp:DetailsView
ID="DetailsView1"
runat="server"
AutoGenerateRows="False"
DataSourceID="SqlDataSource2"
Height="50px"
Width="544px"
DataKeyNames="id"
ondatabound="DetailsView1_DataBound">
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<
asp:TemplateField
HeaderText="Session -Part I"
SortExpression="session_">
<
EditItemTemplate>
<asp:DropDownList
ID="drpsession1"
runat="server"
DataSourceID="SqlDataSource3"
DataTextField="session_time"
DataValueField="session_id"
SelectedValue='<%# Bind("session_") %>'
AppendDataBoundItems="True"
Width="229px">
<asp:ListItem
Text="Please select"
Value="-1"
/>
</asp:DropDownList>
<asp:SqlDataSource
ID="SqlDataSource3"
runat="server"
ConnectionString="<%$ ConnectionStrings:Connstr %>"
SelectCommand="SELECT dbo.sessions.* FROM dbo.sessions"></asp:SqlDataSource>
</EditItemTemplate>
<
asp:TemplateField
HeaderText="Session - Part II"
SortExpression="session2">
<EditItemTemplate>
<asp:DropDownList
ID="drpsession2"
runat="server"
DataSourceID="SqlDataSource4"
DataTextField="session_time"
DataValueField="session_id"
SelectedValue='<%# Bind("session2") %>'
AppendDataBoundItems="True"
Width="234px">
<asp:ListItem
Text="Please select"
Value="-1"
/>
</asp:DropDownList>
<asp:SqlDataSource
ID="SqlDataSource4"
runat="server"
ConnectionString="<%$ ConnectionStrings:Connstr %>"
SelectCommand="SELECT dbo.sessions2.* FROM dbo.sessions2">
</asp:SqlDataSource>
</EditItemTemplate>
</Fields>
</asp:DetailsView>
<
asp:SqlDataSource
ID="SqlDataSource2"
runat="server"
ConnectionString="<%$ ConnectionStrings:Connstr %>"
UpdateCommand
where regform.id=@id">
="UPDATE dbo.regform SET session_=@session_, session2=@session2 where id=@id">
<UpdateParameters>
<asp:ControlParameter
ControlID="ctl00$ContentPlaceHolder1$DetailsView1$drpsession1"
Name="session_"
PropertyName="SelectedValue"
Type="String"
/>
<asp:ControlParameter
ControlID="ctl00$ContentPlaceHolder1$DetailsView1$drpsession2"
Name="session2"
PropertyName="SelectedValue"
Type="String"
/>
<asp:ControlParameter
ControlID="DetailsView1"
Name="id"
PropertyName="SelectedValue"
/>
</UpdateParameters>
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[Code]....
[Code]....
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[Code]....
[Code]....
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[Code]....
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[Code]....
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I have been in the process of updating my code with security methods, and I've been learning this from [URL](or "Security Guidelines: ASP.NET 2.0"). In the middle of the page under "When Constructing SQL Queries, Use Type Safe SQL Parameters" it says "Use type safe parameters when constructing SQL queries to avoid possible SQL injection attacks that can occur with unfiltered input".
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