My main page has an ObservableCollection (defined in a ViewModel) holding objects (defined in a Model) and I have other pages, one that shows details and one to add a new object. I use the MVVM CommunityToolkit.
I can pass one object from the collection to the details page:
[RelayCommand]
async Task GoToDetails(DailyScrum scrum)
{
if (scrum is null)
return;
await Shell.Current.GoToAsync($"{nameof(View.ScrumDetailsPage)}", true,
new Dictionary<string, object>
{
{"Scrum", scrum }
});
}
However, I am not able to pass the whole collection to the "Add" page, add the new object and pass it back:
[RelayCommand]
async Task AddNewScrum(ObservableCollection<DailyScrum> scrums)
{
if (scrums is null)
return;
await Shell.Current.GoToAsync($"{nameof(View.AddScrumPage)}", true,
new Dictionary<string, object>
{
{"Scrums", scrums }
});
}
How can I do this? Or is it a wrong attempt to pass around the collection? Can I write access the collection from another viewmodel?
If the ObservableCollection's size is small, you can try to use the Newtonsoft.Json package to convert it to string and then pass it. Such as:
var jsonstring = JsonConvert.SerializeObject(scrums);
Shell.Current.GoToAsync($"{nameof(View.AddScrumPage)}?param={jsonstring}");
And convert the string to ObservableCollection with the following code:
ObservableCollection<DailyScrum> data = JsonConvert.DeserializeObject<ObservableCollection<DailyScrum>>(jsonstring);
If the collection's size is big, you can store the string in the Preferences. Such as:
var jsonstring = JsonConvert.SerializeObject(scrums);
Preferences.Set("Data", jsonstring);
And get the data in the AddScrumPage:
bool hasKey = Preferences.ContainsKey("Data");
var content = Preferences.Get("Data", string.Empty);
ObservableCollection<DailyScrum> data = hasKey ? JsonConvert.DeserializeObject<Model>(content) : null;
Update
You can try to use the Shell.Current.Navigation, it has the same effect as the Shell.Current.GoToAsync, such as:
[RelayCommand]
async Task GoToDetails(DailyScrum scrum)
{
if (scrum is null)
return;
await Shell.Current.Navigation.PushAsync(new View.ScrumDetailsPage(scrums))
}
Related
I'm trying to force an authenticated user to change password based on a database Boolean flag. I have used asp.net core resource filter to do that. When ChangePassword flag is on I'm hitting this error. If the ChangePassword flag is is false, application doesn't encounter any error.
InvalidOperationException: If an IAsyncResourceFilter provides a result value by setting the Result property of ResourceExecutingContext to a non-null value, then it cannot call the next filter by invoking ResourceExecutionDelegate.
My codes are as follows -
public class ChangePasswordFilter: IAsyncResourceFilter
{
private readonly UserManager<ApplicationUser> _userManager;
private readonly IUrlHelperFactory _urlHelperFactory;
public ChangePasswordFilter(UserManager<ApplicationUser> userManager, IUrlHelperFactory urlHelperFactory)
{
_userManager = userManager;
_urlHelperFactory = urlHelperFactory;
}
public async Task OnResourceExecutionAsync(ResourceExecutingContext context, ResourceExecutionDelegate next)
{
var HttpContext = context.HttpContext;
var urlHelper = _urlHelperFactory.GetUrlHelper(context);
var redirectUrl = urlHelper.Page("/UserManagement/ChangePassword");
var currentUrl = context.HttpContext.Request.Path;
if (redirectUrl != currentUrl)
{
var user = await _userManager.GetUserAsync(context.HttpContext.User);
if (user?.ChangePassword ?? false)
{
//context.Result = new RedirectResult(redirectUrl);
context.Result = new RedirectToActionResult("ChangePassword", "UserManagement", new { ReturnUrl = HttpContext.Request.Path });
}
}
await next();
}
And in startup.ConfigureServices
services.AddScoped<ChangePasswordFilter>();
services.AddMvc(o =>
{
o.Filters.Add(typeof(ChangePasswordFilter));
});
This example is taken from this answer
Force user change password when loading any webpage
Any help appreciated.
Thanks.
The link you referenced is for a question on asp.net core 2.0. There are many differences between asp.net core 2.0 and asp.net core 5.0.
However, the error message is quite clear. You are invoking the ResourceExecutionDelegate after setting the ResourceExecutingContext Result property to a non-null value.
I'm not too familiar with ResourceFilters but what happens if you replace await next(); with return;?
I was having the same issue, while trying to implement this same code.
I did add return; after context.Result, and my code is working fine.
My code:
context.Result = new RedirectResult(redirectUrl);
return;
Hope you find this helpful.
I hope I'm going to make my question as clear as possible.
Basically
I have a list of hundreds of items saved in my FirebaseDatabse.
I convert the data to a JSON
Now I want to use that JSON and apply all the data into different items in the unity scene
I have tried to read all nodes/items in my firebase child section, and I also declared 'foreach' method to do something with each child it faces. But it does not work when I want to call another class or function inside the 'foreach' method and I have no idea why it does not!
I really appreciate any help or idea to achieve it.
If possible I want to make a 'foreach' method and deal with each item differently because the key is different so does the value of each item present in the JSON.
Player.Child(UserId).Child("User_Inventory").Child("Items").GetValueAsync().ContinueWith(task => {
if (task.IsFaulted)
{
// Handle the error...
Debug.LogError("Could not finish (LoadPlayerData) !!");
}
else if (task.IsCompleted)
{
DataSnapshot snapshot = task.Result;
// here is the data for all the items that I have
string JSON = snapshot.GetRawJsonValue();
// Now How can I deal with each key/item present in the JSON?
```
[Update]
public void RetrieveData () {
Player.Child(UserId)
.Child("User_Inventory").GetValueAsync().ContinueWith(task => {
if (task.IsFaulted)
{
// Handle the error...
Debug.LogError("Could not finish (LoadPlayerData) !!");
}
else if (task.IsCompleted)
{
DataSnapshot snapshot = task.Result;
foreach (DataSnapshot child in snapshot.Children)
{
print(Child); // shows only one child's data when the below
//line of code is present!!
DisplayInfo(Child.Key, (int)Child.Value);
}
}});
}
public GameObject Item;
public GameObject Contents;
public void DisplayInfo(string Name, int quantity)
{
Item = Contents.transform.parent.Find(Name).GetComponent<QTY_UI>();
Item.Qty = quantity; // just passing quantity to another class
}
Rather than convert your firebase data to a RawJson and trying to iterate the JSON object, you can iterate through the children of the snapshot directly. You can iterate through children of children in the same manner.
if(task.IsCompleted)
{
DataSnapshot snapshot = task.Result;
foreach (DataSnapshot child in snapshot.Children)
{
string key = child.Key;
string value = child.Value;
//Process child here.
}
}
Update:
Try this to get your children in a more manageable format
Dictionary<string, object> dict = new Dictionary<string, object>();
foreach (DataSnapshot child in snapshot.Children)
{
dict.Add(child.Key, child.Value);
}
//dict now contains all of your json children as a dictionary reference.
I'm trying to complete a general repository for all of the entities in my application. I Have a BaseEntity with property Id, CreatorId and LastModifiedUserId. Now I'd like to Update a record in a collection, without having to modify the field CreatorId, so I have (from the client) an Entity valorized with some fields updated that I want to update.
Hi have 2 ways:
UpdateOneAsync
ReplaceOneAsync
The repo is created like this:
public class BaseRepository<T> : IRepository<T> where T : BaseEntity
{
public async Task<T> Replace/Update(T entity){...}
}
So it's very hard to use Update(1), since I should retrieve with reflection all the fields of T and exclude the ones that I don't want to update.
With Replace(2) I cannot find a way to specify which fields i should exclude when replacing an object with another. Projectionproperty in FindOneAndReplaceOptions<T>() just excludes the fields on the document that is returned after the update.
Am I missing a way in the replace method to exclude the fields or should I try to retrieve the fields with reflection and use a Update?
I don't know if this solution is ok for you .. what i do is :
Declare in Base Repo a method like
public virtual bool Update(TEntity entity, string key)
{
var result = _collection.ReplaceOne(x => x.Id.Equals(key), entity, new UpdateOptions
{
IsUpsert = false
});
return result.IsAcknowledged;
}
then in your controller when you want to update your entities is there where you set the prop you want to change .. like:
[HttpPut]
[ProducesResponseType(typeof(OrderDTO), 200)]
[ProducesResponseType(400)]
public async Task<ActionResult<bool>> Put([FromBody] OrderDTO value)
{
try
{
if (!ModelState.IsValid) return BadRequest(ModelState);
var orderOnDb = await _orderService.FindAsync(xx => xx.Id == value.Id);
if (orderOnDb == null) return BadRequest(Constants.Error.NOT_FOUND_ON_MONGO);
// SET PROPERTY TO UPDATE (MANUALLY)
orderOnDb.LastUpdateDate = DateTime.Now;
orderOnDb.PaymentMethod = value.PaymentMethod;
orderOnDb.StateHistory = value.StateHistory;
//Save on db
var res = await _orderRepo.UpdateAsync(orderOnDb, orderOnDb.Id);
return res;
}
catch (Exception ex)
{
_logger.LogCritical(ex, ex.Message);
throw ex;
}
}
Hope it helps you!!!
While using MongoDB C# driver with WebApi I came to the following problem. When I want to read all documents (or even just one) from the database the repo's function will get the correct data but in WebApi the object returned from the repo causes a stack overflow. I suspect that I am doing something wrong with the way the objects are returned.
WebApi where the Repo's method is called:
// GET api/<controller>
public async Task<List<Event>> Get()
{
return await _repo.FindAll();
}
// GET api/<controller>/5
public async Task<Event> Get(string id)
{
Event e = await _repo.FindById(id);
return e;
}
And corresponding methods in the Repo:
public async Task<Event> FindById(string id)
{
Event e = await _collection.Find<Event>(x => x.ID == ObjectId.Parse(id)).FirstAsync();
return e;
}
public async Task<List<Event>> FindAll()
{
var filter = new BsonDocument();
List<Event> list = await _collection.Find(filter).ToListAsync();
return await Task<List<Event>>.FromResult(list);
}
Thanks for all the help in advance!
Edit: I found that when I return string from the function instead of Event the whole thing works.
What I think is making problems is the ID property in the Event.
The problem was that the Event had an ObjecId property. The JSON.Net doesn't know about that type. See the solution here: JSON.NET cast error when serializing Mongo ObjectId
In Asp.net MVC the url structure goes like
http://example.com/{controller}/{action}/{id}
For each "controller", say http://example.com/blog, there is a BlogController.
But my {controller} portion of the url is not decided pre-hand, but it is dynamically determined at run time, how do I create a "dynamic controller" that maps anything to the same controller which then based on the value and determines what to do?
Same thing with {action}, if the {action} portion of my url is also dynamic, is there a way to program this scenario?
Absolutely! You'll need to override the DefaultControllerFactory to find a custom controller if one doesn't exist. Then you'll need to write an IActionInvoker to handle dynamic action names.
Your controller factory will look something like:
public class DynamicControllerFactory : DefaultControllerFactory
{
private readonly IServiceLocator _Locator;
public DynamicControllerFactory(IServiceLocator locator)
{
_Locator = locator;
}
protected override Type GetControllerType(string controllerName)
{
var controllerType = base.GetControllerType(controllerName);
// if a controller wasn't found with a matching name, return our dynamic controller
return controllerType ?? typeof (DynamicController);
}
protected override IController GetControllerInstance(Type controllerType)
{
var controller = base.GetControllerInstance(controllerType) as Controller;
var actionInvoker = _Locator.GetInstance<IActionInvoker>();
if (actionInvoker != null)
{
controller.ActionInvoker = actionInvoker;
}
return controller;
}
}
Then your action invoker would be like:
public class DynamicActionInvoker : ControllerActionInvoker
{
private readonly IServiceLocator _Locator;
public DynamicActionInvoker(IServiceLocator locator)
{
_Locator = locator;
}
protected override ActionDescriptor FindAction(ControllerContext controllerContext,
ControllerDescriptor controllerDescriptor, string actionName)
{
// try to match an existing action name first
var action = base.FindAction(controllerContext, controllerDescriptor, actionName);
if (action != null)
{
return action;
}
// #ray247 The remainder of this you'd probably write on your own...
var actionFinders = _Locator.GetAllInstances<IFindAction>();
if (actionFinders == null)
{
return null;
}
return actionFinders
.Select(f => f.FindAction(controllerContext, controllerDescriptor, actionName))
.Where(d => d != null)
.FirstOrDefault();
}
}
You can see a lot more of this code here. It's an old first draft attempt by myself and a coworker at writing a fully dynamic MVC pipeline. You're free to use it as a reference and copy what you want.
Edit
I figured I should include some background about what that code does. We were trying to dynamically build the MVC layer around a domain model. So if your domain contained a Product class, you could navigate to products\alls to see a list of all products. If you wanted to add a product, you'd navigate to product\add. You could go to product\edit\1 to edit a product. We even tried things like allowing you to edit properties on an entity. So product\editprice\1?value=42 would set the price property of product #1 to 42. (My paths might be a little off, I can't recall the exact syntax anymore.) Hope this helps!
After a little more reflection, there may be a bit simpler way for you to handle the dynamic action names than my other answer. You'll still need to override the default controller factory. I think you could define your route like:
routes.MapRoute("Dynamic", "{controller}/{command}/{id}", new { action = "ProcessCommand" });
Then on your default/dynamic controller you'd have
public ActionResult ProcessCommand(string command, int id)
{
switch(command)
{
// whatever.
}
}
You need to write your own IControllerFactory (or perhaps derive from DefaultControllerFactory) and then register it with ControllerBuilder.
Iam working with it in .Core but i'll share it's MVC version for all, after that i will share the core version
case OwnerType.DynamicPage:
var dp = mediator.Handle(new Domain.DynamicPages.DynamicPageDtoQuery { ShopId = ShopId, SeoId = seoSearchDto.Id }.AsSingle());
if (dp != null)
{
return GetDynamicPage(dp.Id);
}
break;
// some codes
private ActionResult GetDynamicPage(int id)
{
var routeObj = new
{
action = "Detail",
controller = "DynamicPage",
id = id
};
var bController = DependencyResolver.Current.GetService<DynamicPageController>();
SetControllerContext(bController, routeObj);
return bController.Detail(id);
}
// and
private void SetControllerContext(ControllerBase controller, object routeObj)
{
RouteValueDictionary routeValues = new RouteValueDictionary(routeObj);
var vpd = RouteTable.Routes["Default"].GetVirtualPath(this.ControllerContext.RequestContext, routeValues);
RouteData routeData = new RouteData();
foreach (KeyValuePair<string, object> kvp in routeValues)
{
routeData.Values.Add(kvp.Key, kvp.Value);
}
foreach (KeyValuePair<string, object> kvp in vpd.DataTokens)
{
routeData.DataTokens.Add(kvp.Key, kvp.Value);
}
routeData.Route = vpd.Route;
if (routeData.RouteHandler == null)
routeData.RouteHandler = new MvcRouteHandler();
controller.ControllerContext = new ControllerContext(this.ControllerContext.HttpContext, routeData, controller);
}