Modify Child Object During Gridview OnUpdate Using ObjectDataSource?
Sep 2, 2010
Backgroud: I'm using NHibernate for my model layer, and I have a HTTP module taking care of instantiating the session at the beginning of each request and cleaning it up at the end of each request (i.e. Session Per Request). In this case, I have two object types:
ParentItem - an object with a bunch of properties and a collection of ChildItems. ChildItem - an object with properties including a DateTime (EffectiveDate) and an unenforced FK pointing to a completely different database. The ChildItem class contains a reference back to the parent as well (many-to-one) While the ParentItem has multiple ChildItems in its collection, I'm only generally interested in the latest ChildItem in the collection.
Desire: Want a databound control (GridView or ListView, I don't care which) that allows me to Add/Edit/Delete ParentItems from my datasource. I also want to have the ability to set a new "latest" ChildItem as part of the edit/update.
Issue: I can't seem to access the underlying DataItem from the GridView/ListView in the OnItemUpdating handler (which isn't unexpected, since the data is now in the viewstate). What I thought I could do would be to load a ParentItem from my session using the ID from the databound control, create a new ChildItem, add it to the ParentItem, and then save the ParentItem. Since NHibernate caches the data, the load should give me a copy from cache (no roundtrip to the DB) and I'd either be doing this before the ParentItem was saved back (thus no changes committed to ParentItem, just to ChildItem) or after (thus the cached version is still the same, and my new object will match the updated version). What I get when I do this (for ParentItemID=1):
a different object with the same identifier value was already associated with the session: 1, of entity:
I have a GridView, I bind it to ObjectDataSource. ObjectDataSource takes data from a database's table. Each row in table has unique ID.
I have a button in each row of GridView that should remove this row from database. My ObjectDataSource returns Object, this returned object contains ID (and some other information, like name, user etc.) however I do not show this ID on my grid.
how can I get these ID after user chooses to delete row, I need to know what I should remove.
I am trying to update record in gridview using ObjectDataSource (with conflict detection)The following is the ObjectDataSource
[Code]....
Update Method is as follows
[Code]....
In ObjectDataSourceProducts_Updating(..) event , I am checking objects which are being sent to UpdateProduct(..) method. I found that both the objects " original_ProductDB and productDB " have the same the values. When I click "Update" in GridView after entering new value, ObjectDataSource is not picking new value
I have a List of complex objects containing other objects within that I give as the data source to a gridview.(currently I'm using BoundFields for the columns). I need to bind data to the columns from the objects within at run time. How can this be done?
I'm having an issue when using the Asp.Net Cache functionality. I add an object to the Cache then at another time I get that object from the Cache, modify one of it's properties then save the changes to the database.
But, the next time I get the object from Cache it contains the changed values. So, when I modify the object it modifies the version which is contained in cache even though I haven't updated it in the Cache specifically. Does anyone know how I can get an object from the Cache which doesn't reference the cached version?i.e.
Step 3: Item item = (Item)Cache.Get("test"); if(item.Title == "Test 1"){ Response.Write("Object has been changed in the Cache."); }
I realise that with the above example it would make sense that any changes to the item get reflected in cache but my situation is a bit more complicated and I definitely don't want this to happen.
Is there any way to return object from Session when Select is called on ObjectDataSource? Specifically, I have Products object and saved in Session. Now on another page I have ObjectDataSource which will call same bussiness object method to get Products object. Here I want to hook up any event like Selecting and I would like to return Products object from Session to Select method of ObjectDataSource.
I'm using Dynamic Data and LINQ to SQL for some admin pages on a .NET 3.5 web app. All my admin tables have a CreatedBy, CreatedDate, UpdatedBy, and UpdatedDate.I'm looking for a way to inject the setting of these properties before the objects are inserted and updated.
I've seen an object_inserting hook if you have a linq to sql datasource in the web form, but I'm using dynamic data...is there an easy way to generically set that? And I've also looked at modifying each of the partial classes for my admin objects, but the closest hook I see is to implement the OnValidate method with the Insert action.
UserDS class has getUsers that returns DataTable and getUserNum that returns int, this part works as it's supposed. But I wonder if can access the instance of UserDS somehow (not underlying DataTable)?
public static List<Customer> GetCustomers(int maximumRows, int startRowIndex) { try { ... some select to database here... } catch (Exception ex) { Utils.LogError(ex); throw ex; } }
Now let's imagine that GetCustomers for some reason throws an exception. How could i catch this exception and handle it? I know i can use Application_Error, but i would like to catch this exception somehow on my page and show some friendly message to the user.
I have a series of classes that loosely fit the following pattern:
public class CustomerInfo { public int Id {get; set;} public string Name {get; set;} public class CustomerTable { public bool Insert(CustomerInfo info) { /*...*/ } [code]...
But I get the error message that I can't create an object of the type System.TypeCode from the string containing SB.BusinessLogic.DomainEntity.User for the property Type.
I have designed a collapsible nested gridview project using this article as a reference Collapsible Nested GridView with Paging using ASP.Net. I am trying to modify the code to collapse a gridview when another gridview is expanded so that only one nested gridview will be open at a time.
I'm trying to use an ObjectDataSource's SelectMethod() to retrieve a result set from a sql server database to populate a data table with various stored procs that have any given number of parameters. My approach is to pass an object which contains the stored proc name and information about its parameters into the SelectMethod(). My issue is that I don't know how to actually set the default value. Here is the code I have so far:
namespace WebApplication1 { public class Children { public DataTable Select(object storedProc) { // do stuff here and get db values. } } }
The default value of a Parameter object is a string type. Does anyone know how to set the default value with an object or how I can pass an object into the SelectMethod?
I have an ObjectDataSource in Visual Studio 2008. I have a DataSet defined with a TableAdapter. However, when I go to select the Table Adapter to use in the ObjectDataSource, nothing shows up. I double checked that the DataSet is in fact in the App_Code folder. I do not know what else to try. The following code is the ASP code for that ObjectDataSource:
I am using an ObjectDataSource control to call a MapInfo object. This object has two properties:
public IList Visits public int TotalAvailable
The select method returns an IList but the TotalAvailable property is also populated. I have set the TypeName in the ObjectDataSource to the MapInfo object but because the Select method only returns the IList I don't have access to the TotalAvailable.
[code]....
Is there any way to access this value. I know it is being populated in the MapInfo object but all that gets returned from the Select method is the IList
i have create dynamic menu control , i have master page and login page , once the user login , i want to show the dynamic menu in my master page. below i try to call masterpage control in my child page ,but i throughs the error
Object reference not set to an instance of an object. my master page code public partial class MasterPage : System.Web.UI.MasterPage { protected void Page_Load(object sender, EventArgs e) { } public string MyProperty { set { // lblUser.Text = value; lblUser.Text = value; // here i got the error } } }
My child page code
protected void btnwork_Click(object sender, EventArgs e) { ((MasterPage)this.Master).MyProperty = "Text changed from Sub Page"; }
