s WEB FORMS UI in VB.NET

Generation PDF 417 in VB.NET s WEB FORMS UI

CHAPTER 10 s WEB FORMS UI
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The current Project object is retrieved from Session (or pulled from the database), and the new values entered by the user are mapped into the object s properties using the DataMapper from 5. Then SaveProject() is called to save the project and update Session with the newly updated data. The update operation works in a similar manner, so I won t detail it here.
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DeleteObject is a bit different: Protected Sub ProjectDataSource_DeleteObject( _ ByVal sender As Object, ByVal e As Csla.Web.DeleteObjectArgs) _ Handles ProjectDataSource.DeleteObject Try Project.DeleteProject(New Guid(e.Keys("Id").ToString)) Session("currentObject") = Nothing e.RowsAffected = 1 Catch ex As Csla.DataPortalException Me.ErrorLabel.Text = ex.BusinessException.Message e.RowsAffected = 0 Catch ex As Exception Me.ErrorLabel.Text = ex.Message e.RowsAffected = 0 End Try End Sub If the user clicks the link in the DetailsView control to delete the project, the DeleteObject event is raised. e.Keys contains the Id row value from the DetailsView, because the DataKeyNames property on the control is set to Id. This value is used to create a Guid, which is then passed to the Shared DeleteProject() method to delete the project. Of course, this immediately deletes the Project using the data portal, and so proper exception handling is implemented to display any exception messages in ErrorLabel. Once the Project has been deleted, it makes no sense to leave the user on ProjectEdit. If the delete operation is successful, the DetailsView control raises an ItemDeleted event: Protected Sub DetailsView1_ItemDeleted( _ ByVal sender As Object, _ ByVal e As System.Web.UI.WebControls.DetailsViewDeletedEventArgs) _ Handles DetailsView1.ItemDeleted Response.Redirect("ProjectList.aspx") End Sub The user is simply redirected to ProjectList, where she should no longer see the deleted project in the list.
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ResourcesDataSource
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The ResourcesDataSource control takes care of data binding dealing with the Resources collection from the Project object. The GridView control in MainView is bound to this control, and the page handles its DeleteObject, SelectObject, and UpdateObject events.
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CHAPTER 10 s WEB FORMS UI
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There s no need to handle the InsertObject event, because the GridView isn t used to dynamically add ProjectResource objects to the collection. I ll discuss adding a new child object shortly. The SelectObject event handler returns the collection of ProjectResource objects for the Project: Protected Sub ResourcesDataSource_SelectObject( _ ByVal sender As Object, ByVal e As Csla.Web.SelectObjectArgs) _ Handles ResourcesDataSource.SelectObject Dim obj As Project = GetProject() e.BusinessObject = obj.Resources End Sub It first gets the current Project object by calling GetProject(). Then it simply provides the Resources collection to the data source control, which in turn provides it to any UI controls requiring the data. The DeleteObject and UpdateObject event handlers are worth exploring a bit. The DeleteObject handler gets the ResourceId value from the GridView control through e.Keys and uses that value to remove the ProjectResource object from the collection: Protected Sub ResourcesDataSource_DeleteObject( _ ByVal sender As Object, ByVal e As Csla.Web.DeleteObjectArgs) _ Handles ResourcesDataSource.DeleteObject Dim obj As Project = GetProject() Dim rid As Integer = CInt(e.Keys("ResourceId")) obj.Resources.Remove(rid) e.RowsAffected = SaveProject(obj) End Sub The current Project object is retrieved, and then the Remove() method is called on the Resources collection to remove the specified child object. SaveProject() is then called to commit the change. UpdateObject is a bit more complex: Protected Sub ResourcesDataSource_UpdateObject( _ ByVal sender As Object, ByVal e As Csla.Web.UpdateObjectArgs) _ Handles ResourcesDataSource.UpdateObject Dim obj As Project = GetProject() Dim rid As Integer = CInt(e.Keys("ResourceId")) Dim res As ProjectResource = obj.Resources.GetItem(rid) Csla.Data.DataMapper.Map(e.Values, res) e.RowsAffected = SaveProject(obj) End Sub In this case, the actual child object is retrieved from the Resources collection. Then the values entered into the GridView by the user are pulled from e.Values and are mapped into the child object using DataMapper. And finally, SaveProject() is called to commit the changes.
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