We might have experienced in the MVC View, if we have Enumerable list is null for dropdown or select box normally we get an exception.
In MVC Razor controls we need to make sure all enumerable properties of a view model object should be set by default as empty.
Example:
SelectedList list = numerable.Empty<SelectedList>()
Use “Array.ConvertAll “ convert string array to integer array.
For example:
String Items = “1,2,3,4”
1) Convert into array
String[] ItemsArray = items.Split(‘,’);
2) Convert into Integer Array
Int[] intItemsArray = Array.ConvertAll(ItemsArray,Int.Parse );
Thanks,
Aravind
MVC:
In MVC , M is a model which can hold logic to persists the data. V represents view it just responsible to display data and C is controller .
C Is heart for the MVC. Controller is responsible to handle the incoming request and invoke the corresponding view by passing the model.
Controller can call multiple view by as per business logic .
MVP:
In MVP , P stands for presenter and Controller is replaced by Presenter. Presenter is not responsible to handle the input request. Presenter and View communicates with each other
thorough some interface. Presenter is responsible for handling all the requests made by the view and Communicate with model and updates the view. In MVP , The Presenter
should associated with one View.
MVVM:
In MVVM, VM view model is same as Presenter But VM can have multiple views. View has a reference to ViewModel and it supports two way binding.
All above design patterns are used to implement loosely coupled system which allows us achieve extendibility, testability and scalability .
Controllers:
A controller built using the MVC should
• Contain the logic required to initialize the scope
• Contain the logic/behaviors required by the view to present data from the scope
• Contain the logic/behaviors required to update the scope based on user interaction
The controller should not
• Contain logic that manipulates the DOM (that is the job of the view)
• Contain logic that manages the persistence of data (that is the job of the model)
• Manipulate data outside of the scope
Views:
• Contain the logic and markup required to present data to the user
Views should not
• Contain complex logic (this is better placed in a controller)
• Contain logic that creates, stores, or manipulates the domain model
Models:
• Contain the domain data
• Contain the logic for creating, managing, and modifying the domain data (even if that means
executing remote logic via web services)
• Provide a clean API that exposes the model data and operations on it
The model should not
• Expose details of how the model data is obtained or managed (in other words, details of the
data storage mechanism or the remote web service should not be exposed to controllers and views)
• Contain logic that transforms the model based on user interaction (because this is the
controller’s job)
• Contain logic for displaying data to the user (this is the view’s job)
In general the web application would not allow the special characters when posting the data to server to avoid injections.
There are two ways we can handle the scenario
1) Don’t allow special characters : Provide user friendly message to the user. And this might be annoying to client sometimes it is required to enter special characters.
2) Allow the special characters: Let allow the special characters and handle it using data scrubbing. Use proper encoding and decoding techniques to handle special characters.
In ASP.net MVC , we have to decorate “AllowHtml” for a property requires a HTML. So that asp.net will handle it.
Finalize method is called in the Following Events.
1. When Generation[0] is Full on the managed heap.
2. When the program force the Garbage collector by GC.Collect.
3. When Windows reports low memory to the CLR, the CLR force the garbage collection.
4. When ClR is Unloading as ApplicationDomain.
5. CLR is shutting down
1) Go to Model browser
2) On Model Browser type Stored Procedure name looking to update
3) Find all references and delete from Model.
4) Right click and Update Model
5) Click the Stored procedure and Click on finish
6) 