All of my tables have common audit fields: modifiedBy,modifiedDateTime, etc.
I would like to have these automatically set, and can set most of them with the following code:
partial class myEntities
{
partial void OnContextCreated()
{
this.SavingChanges += new EventHandler(Entities_SavingChanges);
}
private void Entities_SavingChanges(object sender, EventArgs e)
{
IEnumerable<ObjectStateEntry> objectStateEntries =
from ose
in this.ObjectStateManager.GetObjectStateEntries(EntityState.Added | EntityState.Modified)
where ose.Entity != null
select ose;
var auditDate = DateTime.Now;
var auditUser = System.Web.HttpContext.Current.User.Identity.Name;//I wish
foreach (ObjectStateEntry entry in objectStateEntries)
{
ReadOnlyCollection<FieldMetadata> fieldsMetaData = entry.CurrentValues.DataRecordInfo.FieldMetadata;
FieldMetadata modifiedField = fieldsMetaData.Where(f => f.FieldType.Name == "ModifiedBy").FirstOrDefault();
if (modifiedField.FieldType != null)
{
string fieldTypeName = modifiedField.FieldType.TypeUsage.EdmType.Name;
if (fieldTypeName == PrimitiveTypeKind.String.ToString())
{
entry.CurrentValues.SetString(modifiedField.Ordinal, auditUser);
}
}
}
}
}
The problem is that there doesn't appear to be any way to get access to the current user. The app is intranet only, using Windows auth.
Is there a way to either pass in a parameter, or get access to the HttpContext (which doesn't seem like it would be a good idea, but I'm stuck)? Is there a way to populate the EventArgs with information?
Check out the section where the poster has overridden the SaveChanges method (6th code box down on the page). This way you can pass in the UserID and perform your audit and not have to use an event handler.
Related
I need some advice on how to proceed with the mvc app I'm building. On my page I type out who is logged in to the page. This I first did by creating a base class where I created a user class which contained the users name and a image representing the user. Then I passed this class on to my views. But I also need to pass other models to my views depending on what view I'm in. Sure I could build a class that contain all different models I need to use on each page but there should be a easy way to pass name and image values across the pages and be persistant? I tried TempData together with TempData.Keep() but that was not persistant. How can I pass theses values between pages?
public ActionResult Validate(AccountModels.LoginModel model)
{
if (ModelState.IsValid)
{
if (Membership.ValidateUser(model.UserName, model.Password))
{
var mu = _repo.GetUser(Membership.GetUser().ProviderUserKey.ToString());
TempData["Name"] = mu.Name;
TempData["Image"] = mu.Image;
TempData.Keep();
FormsAuthentication.RedirectFromLoginPage(model.UserName, model.RememberMe);
}
}
return View("Index");
}
As #Jyoti said, you could use of Keep() method.
To make it easy to work with TempData, I wrote these methods in my BaseController, and I use it in every controller when I need to transfer data between actions or between view and controller.
protected TReturnType GetTempDataValue<TReturnType>(PsmConstants.TempDataKey sessionName, bool peekData =false )
{
object value = peekData ? TempData.Peek(sessionName.ToString()) : TempData[sessionName.ToString()];
return (TReturnType) value;
}
protected void RemoveTempData(PsmConstants.TempDataKey sessionName)
{
if (TempData.ContainsKey(sessionName.ToString()) && TempData[sessionName.ToString()] == null) return;
TempData[sessionName.ToString()] = null;
}
protected void SetTempDataValue(PsmConstants.TempDataKey sessionName, object value)
{
if(TempData.ContainsKey(sessionName.ToString()))
TempData[sessionName.ToString()]=null;
TempData[sessionName.ToString()] = value;
}
protected void KeepTempDataValue(PsmConstants.TempDataKey sessionName)
{
if (TempData.ContainsKey(sessionName.ToString()))
TempData.Keep(sessionName.ToString());
}
And this is the Keys enumeration :
public enum TempDataKey
{
PageError = 1,
PageInfo = 2
}
And this is, the usage of these methods(Set value and Get value from TempData):
SetTempDataValue(PsmConstants.TempDataKey.PageError , 'your error message' );
var originalValues = GetTempDataValue<MyModel>(PsmConstants.TempDataKey.Info, true);
Use session instead of Temp if it is not working.but i think it should work.
TempData["Name"] = mu.Name;TempData["Image"] = mu.Image;TempData.Keep();
How you are passing this into other models,Please share the source code so that it will easy to identify.
I am trying to show 10,000 contacts on listview in xamarin forms using realm. But whenever user traverse to contact listing screen
it gets freezed and loads after a while.
Moreover , i have provided an option to search from list as well and that too gets stuck as search if performing on UI thread.
Following is the code to load data from realm
public override async Task Initialize(Object data )
{
private Realm _realmInstance = getRealm();
if (contactList != null)
{
contactList.Clear();
}
contactList = _realmInstance.All<Contact>().OrderByDescending(d => d.contactId).ToList();
// here the binding happens with realm data
contacts = new ObservableCollectionFast<Contact>(contactList);
}
public ObservableCollectionFast<Contact> contacts
{
get { return items; }
set
{
items = value;
OnPropertyChanged("contacts");
}
}
as it was taking time in loading i thought to fetch realm data in background and bind it on UI thread as follows
but that is throwing error
realm accessed from incorrect thread
await Task.Run(() => {
contactList = _realmInstance.All<Contact>().OrderByDescending(d => d.contactId).ToList();
});
if (contactList.Count() > 0)
{
ContactListView = true;
AddContactMsg = false;
}
else
{
AddContactMsg = true;
}
Device.BeginInvokeOnMainThread(() =>
{
contacts = new ObservableCollectionFast<Contact>(contactList);
});
i wanted to try limiting the results by using TAKE function of LINQ but unfortunately its not supported by realm yet. not sure how i can smoothly load records from realm to listview.
EDIT
as per the SushiHangover i have changed things from IList to IQueryable
public IQueryable<Contact> contacts
{
get { return items; }
set
{
items = value;
OnPropertyChanged("contacts");
}
}
public override async Task Initialize(Object data )
{
_realmInstance = getRealm();
contacts = dbContactList= _realmInstance.All<Contact>();
}
so far search is working pretty smoothly but IQueryable change leads to another issue. on repeatedly performing following steps results in app crash
tap on list item
detail page gets open then press back
scroll down to few records
perform step 1 and repeat
this results into stackoverflow error
04-19 06:05:13.980 F/art ( 3943): art/runtime/runtime.cc:289]
Pending exception java.lang.StackOverflowError thrown by 'void
md5b60ffeb829f638581ab2bb9b1a7f4f3f.CellAdapter.n_onItemClick(android.widget.AdapterView,
android.view.View, int, long):-2' 04-19 06:05:13.980 F/art (
3943): art/runtime/runtime.cc:289] java.lang.StackOverflowError: stack
size 8MB
Link to entire log file
code to fire item click command is
public ICommand OnContactSelectCommand => new Command<Contact>(OnContactSelect);
following code will open ups a detail page
private async void OnContactSelect(Contact contact)
{
if (contact != null)
{
await NavigationService.NavigateToAsync<ContactDetailViewModel>(contact.mContactId);
}
}
Note:
when i replace IQueryable with List i do not face any error
somehow my issue is related to realm github thread where user is getting exception on listView.SelectedItem = null while using IQueryable
here is my code of list view item tap
private static void ListViewOnItemTapped(object sender, ItemTappedEventArgs e)
{
var listView = sender as ListView;
if (listView != null && listView.IsEnabled && !listView.IsRefreshing)
{
// have commented this line because it was crashing the app
//listView.SelectedItem = null;
var command = GetItemTappedCommand(listView);
if (command != null && command.CanExecute(e.Item))
{
command.Execute(e.Item);
}
}
}
I'm developing my first app for Windows Phone 7.1 using Reactive UI, and I'm facing difficulties working with ReactiveCollection class.
My app is roughly about accessing the WP7 SQL CE engine (LINQ to SQL). I would like to perform data operations in background, using ReactiveAsyncCommand. Data from database should "automagically" appear in UI, therefore I decided to use ReactiveCollection as a proxy between database and UI.
Here's my model, so you could have a better idea:
public class EncounteredModel
{
public ReactiveCollection<Fact> FactsCollection;
public ReactiveCollection<FactEntry> FactEntriesCollection;
private EncounteredModel()
{
using (EncounteredDataContext db = new EncounteredDataContext())
{
FactsCollection = new ReactiveCollection<Fact>(from fact in db.Facts select fact);
FactEntriesCollection = new ReactiveCollection<FactEntry>(from factEntry in db.FactEntries select factEntry);
}
FactsCollection.ItemsAdded.Subscribe(fact => { using (var db = new EncounteredDataContext()) { db.Facts.InsertOnSubmit(fact); db.SubmitChanges(); } });
FactsCollection.ItemsRemoved.Subscribe(fact => { using (var db = new EncounteredDataContext()) { db.Facts.DeleteOnSubmit(fact); db.SubmitChanges(); } });
FactEntriesCollection.ItemsAdded.Subscribe(factEntry => { using (var db = new EncounteredDataContext()) { db.FactEntries.InsertOnSubmit(factEntry); db.SubmitChanges(); } });
FactEntriesCollection.ItemsRemoved.Subscribe(factEntry => { using (var db = new EncounteredDataContext()) { db.FactEntries.DeleteOnSubmit(factEntry); db.SubmitChanges(); } });
}
private static EncounteredModel instance;
public static EncounteredModel Instance
{
get
{
if (instance == null)
instance = new EncounteredModel();
return instance;
}
}
}
In my view model I've tried using 2 different variants:
Create a derived reactive collection and bind UI to it (With ReactiveCollection.CreateDerivedCollection() method. It's derived from the EncounteredModel.FactsCollection, for example.
Use ObservableAsPropertyHelper<IEnumerable<Fact>>, then subscribe to Model's ReactiveCollection Changed IObservable to populate the OAPH.
Both variants, unfortunately, give me "Invalid cross-thread access." Stack trace is generally the same for both variants, here's one for the variant 1 (shortened to the significant part):
at MS.Internal.XcpImports.CheckThread()
at System.Windows.DependencyObject.GetValueInternal(DependencyProperty dp)
at System.Windows.FrameworkElement.GetValueInternal(DependencyProperty dp)
at System.Windows.DependencyObject.GetValue(DependencyProperty dp)
at System.Windows.Controls.ItemsControl.get_ItemsHost()
at System.Windows.Controls.ItemsControl.OnItemsChangedHandler(Object sender, ItemsChangedEventArgs args)
at System.Windows.Controls.ItemContainerGenerator.OnItemAdded(Object item, Int32 index, Boolean suppressEvent)
at System.Windows.Controls.ItemContainerGenerator.System.Windows.Controls.ICollectionChangedListener.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at System.Windows.Controls.WeakCollectionChangedListener.SourceCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Windows.Controls.ItemCollection.NotifyCollectionChanged(NotifyCollectionChangedEventArgs e)
When I change to ReactiveCommand (not async one), everything's fine. Any ideas how to overcome this? Much thanks in advance.
ReactiveCollection doesn't proxy everything to the UI thread, if you add items to it from a worker thread, you will signal the UI on that same thread and get the crash.
However, one thing that ReactiveAsyncCommand does for you is give you back the results back on the UI thread, so you can do something like this:
var cmd = new ReactiveAsyncCommand();
cmd.RegisterAsyncFunc(() => getAllTheItems())
.Subscribe(theItems => theItems.ForEach(item => collection.Add(item)));
The Subscribe is guaranteed to be on the UI thread (if it isn't, that's a bug)
I'm using SPMetal in order to generate entity classes for my sharepoint site and I'm not exactly sure what the best practice is to use when there are multiple content types for a single list. For instance I have a task list that contains 2 content types and I'm defining them via the config file for SPMetal. Here is my definition...
<List Member="Tasks" Name="Tasks">
<ContentType Class="LegalReview" Name="LegalReviewContent"/>
<ContentType Class="Approval" Name="ApprovalContent"/>
</List>
This seems to work pretty well in that the generated objects do inherit from WorkflowTask but the generated type for the data context is a List of WorkflowTask. So when I do a query I get back a WorkflowTask object instead of a LegalReview or Approval object. How do I make it return an object of the correct type?
[Microsoft.SharePoint.Linq.ListAttribute(Name="Tasks")]
public Microsoft.SharePoint.Linq.EntityList<WorkflowTask> Tasks {
get {
return this.GetList<WorkflowTask>("Tasks");
}
}
UPDATE
Thanks for getting back to me. I'm not sure how I recreate the type based on the SPListItem and would appreciate any feedback.
ContractManagementDataContext context = new ContractManagementDataContext(_url);
WorkflowTask task = context.Tasks.FirstOrDefault(t => t.Id ==5);
Approval a = new Approval(task.item);
public partial class Approval{
public Approval(SPListItem item){
//Set all properties here for workflowtask and approval type?
//Wouldn't there be issues since it isn't attached to the datacontext?
}
public String SomeProperty{
get{ //get from list item};
set{ //set to list item};
}
Linq2SharePoint will always return an object of the first common base ContentType for all the ContentTypes in the list. This is not only because a base type of some description must be used to combine the different ContentTypes in code but also it will then only map the fields that should definitely exist on all ContentTypes in the list. It is however possible to get access to the underlying SPListItem returned by L2SP and thus from that determine the ContentType and down cast the item.
As part of a custom repository layer that is generated from T4 templates we have a partial addition to the Item class generated by SPMetal which implements ICustomMapping to get the data not usually available on the L2SP entities. A simplified version is below which just gets the ContentType and ModifiedDate to show the methodology; though the full class we use also maps Modified By, Created Date/By, Attachments, Version, Path etc, the principle is the same for all.
public partial class Item : ICustomMapping
{
private SPListItem _SPListItem;
public SPListItem SPListItem
{
get { return _SPListItem; }
set { _SPListItem = value; }
}
public string ContentTypeId { get; internal set; }
public DateTime Modified { get; internal set; }
public virtual void MapFrom(object listItem)
{
SPListItem item = (SPListItem)listItem;
this.SPListItem = item;
this.ContentTypeId = item.ContentTypeId.ToString();
this.Modified = (DateTime)item["Modified"];
}
public virtual void MapTo(object listItem)
{
SPListItem item = (SPListItem)listItem;
item["Modified"] = this.Modified == DateTime.MinValue ? this.Modified = DateTime.Now : this.Modified;
}
public virtual void Resolve(RefreshMode mode, object originalListItem, object databaseObject)
{
SPListItem originalItem = (SPListItem)originalListItem;
SPListItem databaseItem = (SPListItem)databaseObject;
DateTime originalModifiedValue = (DateTime)originalItem["Modified"];
DateTime dbModifiedValue = (DateTime)databaseItem["Modified"];
string originalContentTypeIdValue = originalItem.ContentTypeId.ToString();
string dbContentTypeIdValue = databaseItem.ContentTypeId.ToString();
switch(mode)
{
case RefreshMode.OverwriteCurrentValues:
this.Modified = dbModifiedValue;
this.ContentTypeId = dbContentTypeIdValue;
break;
case RefreshMode.KeepCurrentValues:
databaseItem["Modified"] = this.Modified;
break;
case RefreshMode.KeepChanges:
if (this.Modified != originalModifiedValue)
{
databaseItem["Modified"] = this.Modified;
}
else if (this.Modified == originalModifiedValue && this.Modified != dbModifiedValue)
{
this.Modified = dbModifiedValue;
}
if (this.ContentTypeId != originalContentTypeIdValue)
{
throw new InvalidOperationException("You cannot change the ContentTypeId directly");
}
else if (this.ContentTypeId == originalContentTypeIdValue && this.ContentTypeId != dbContentTypeIdValue)
{
this.ContentTypeId = dbContentTypeIdValue;
}
break;
}
}
}
Once you have the ContentType and the underlying SPListItem available on your L2SP entity it is simply a matter of writing a method which returns an instance of the derived ContentType entity from a combination of the values of the base type and the extra data for the missing fields from the SPListItem.
UPDATE: I don't actually have an example converter class as we don't use the above mapping extension to Item in this way. However I could imagine something like this would work:
public static class EntityConverter
{
public static Approval ToApproval(WorkflowTask wft)
{
Approval a = new Approval();
a.SomePropertyOnWorkflowTask = wft.SomePropertyOnWorkflowTask;
a.SomePropertyOnApproval = wft.SPListItem["field-name"];
return a;
}
}
Or you could put a method on a partial instance of WorkflowTask to return an Approval object.
public partial class WorkflowTask
{
public Approval ToApproval()
{
Approval a = new Approval();
a.SomePropertyOnWorkflowTask = this.SomePropertyOnWorkflowTask;
a.SomePropertyOnApproval = this.SPListItem["field-name"];
return a;
}
public LegalReview ToLegalReview()
{
// Create and return LegalReview as for Approval
}
}
In either situation you would need to determine the method to call to get the derived type from the ContentTypeId property of the WorkflowTask. This is the sort of code I would normally want to generate in one form or another as it will be pretty repetitive but that is a bit off-topic.
I have a simple user control in Windows Phone 7 and I want to get access to the querystring collection from the user controls Constructor. I have tried many ways and cannot seem to get acess to the containing XAML's querystring collection.
Essentially I am navigating to the page and the my user control is going to access the querystring value to write the value back to the interface.
Am I missing adding an assembly or reference or something?
I am not sure you should be trying to get at the information from the page's constructor, as it won't necessairly get called every time you land on this page. A better approach is to override the OnNavigatedTo method inherited from PhoneApplicationPage. Looking a little more carefully at your question, you may be trying to do this within a control embedded in the page, in which case you need to get at the Page in order to obtain the navigation information.
Regardless, the NavigationContext property from the page has a QueryString parameter that you can use to access the information you're after.
The following example assumes I have a parameter named "Message" in the query string when navigating to this page:
public partial class MyPage : PhoneApplicationPage
{
// Constructor
public MyPage()
{
InitializeComponent();
}
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
base.OnNavigatedTo(e);
String navigationMessage;
if (NavigationContext.QueryString.TryGetValue("Message", out navigationMessage))
{
this.textBlock1.Text = navigationMessage;
}
}
}
Sorry about that - I started to get there, and thanks for the clarification. Your best bet then is to walk up the visual tree from your control to find the Page, then you can have at the NavigationContext. In my sample below, I have a button on a custom control within the page, whose click event finds the nav context and looks for a certain navigation parameter - I couldn't tell from the question or your follow-up what would drive the control to "want" to find the content of the query string.
(Note about getting info from the ctor follows the code below)
public partial class WindowsPhoneControl1 : UserControl
{
public WindowsPhoneControl1()
{
InitializeComponent();
}
private void button1_Click(object sender, RoutedEventArgs e)
{
GetTheQueryString();
}
private void GetTheQueryString()
{
var result = "No Joy";
var page = FindRootPage(this);
if (page != null)
{
if (page.NavigationContext.QueryString.ContainsKey("Param"))
{
result = page.NavigationContext.QueryString["Param"];
}
}
queryStringText.Text = result;
}
private static PhoneApplicationPage FindRootPage(FrameworkElement item)
{
if (item != null && !(item is PhoneApplicationPage))
{
item = FindRootPage(item.Parent as FrameworkElement);
}
return item as PhoneApplicationPage;
}
}
Note that this won't work from the ctor because of how Xaml works...the Xml tag drives the ctor to be called, then properties are set as indicated, then it is added as a child/item/etc in its container. If you do need to get at the context ASAP using this "walk up the tree" technique, handle the Control's Loaded event, by which time the control does have a parent and a tree that can be walked...
public WindowsPhoneControl1()
{
InitializeComponent();
Loaded += WindowsPhoneControl1_Loaded;
}
private void WindowsPhoneControl1_Loaded(Object sender, RoutedEventArgs e)
{
GetTheQueryString();
}
I would add a property to the UserControl subclass that would be set by the page in its OnNavigatedTo() method.