Entity Framework Interview Questions And Answers
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On selecting this option Entity Framework will adhere to Singular or Plural coding conventions. When we create a edmx file, it will have the list of entities and context class which will be derived from DB Context class. Page 1 of 3.- What Is Entity Framework Core? It ships in Nuget packages, the main one being Microsoft. Entity Framework EF Core is a lightweight, extensible, open source and cross-platform version of the popular Entity Framework data access technology. EF Core...
Entity Framework Interview Questions And Answers | Freshers | Experienced
What are some of the advantages of using a session? There are numerous advantages of making use of a session as mentioned below: It is used to store user data across the span of an application. It is very easy to implement and store any sort of object in the program. Individual entities of user data can be stored separately if required. The session is secure, and objects get stored on the runtime server. Is it possible to manually set a timeout for a session in.- It can easily be done by manipulating the web. Next up on this set of top. NET interview questions for freshers and experienced developers, we can take a look at the questions categorized as intermediate! Intermediate Interview Questions What is the meaning of boxing and unboxing in. Boxing is the process that is used when a user wishes to convert a value type into a reference type directly. Unboxing is the opposite of boxing, where the reference type is converted back into a value type. What is the use of manifest in the. NET framework? Manifest is mainly used to store the metadata of the assembly.
- It contains a variety of metadata which is required for many things as given below: Assembly version information Scope checking of the assembly Reference validation to classes What are memory-mapped files used for in. Memory-mapped files in. NET are used to instantiate the contents of a logical file into the address of the application. This helps a user run processes simultaneously on a single machine and have the data shared between processes. The MemoryMappedFile. CreateFromFiles function is used to obtain a memory-mapped file object easily. What is the meaning of CAS in. It is vital in the prevention of unauthorized access to programs and resources in the runtime.
- It can provide limited access to code to perform only certain operations rather than providing all at a given point in time. CAS forms to be a part of the native. NET security architecture. What is the meaning of garbage collection? Garbage collection is a process that is used to maintain various aspects of memory to prevent memory leaks during program execution. An entity called the garbage collector is used to allocate and deallocate memory as and when required by an application. This is done by performing checks on the references of variables and objects used by the application. If an object is no longer required by the application, the memory is deallocated and freed up.
- If you want to learn Data Structures in C and master various aspects of C programming language, make sure to check out C Programming Course from Intellipaat. What is the use of GAC in. GAC is a part of CLR, which is used to store the assemblies that are shared across all of the applications. A user can make use of the gacutil application to add any file into GAC easily. The next. NET interview question we will check involves an important concept. What are the three generations of garbage collection in. The three generations of garbage collection are as follows: Gen 0: Stores short-lived objects Gen 1: Objects moved from Gen 0 live here Gen 2: Stores long-lived objects and Gen 1 objects Next on this top dot net interview questions blog, we have to check out a frequently asked concept that is MVC.
- What is MVC? It is an architectural model that is used to build applications in. It serves as the foundation for the creation of applications. MVC consists of three entities as the name suggests: Model: Used to store and pull back data from a database View: Used to display the contents of an application Controllers: Entities that handle user interaction What are the types of memories supported in the.
- There are two types of memories present in. What is the use of delegation in. A delegate works similar to that of a function pointer of other programming languages. It provides a way to encapsulate the reference of a method in an object. A delegate object can be easily passed to a program after this, and then a method, which was referenced earlier, can be called. Custom events can also be created in the class using a delegate. Next up on this top. NET interview questions and answers, we need to understand a very important difference. Check it out. What is the difference between an abstract class and an interface in. Abstract Class Provides the partial implementation of functionalities that is done by inheriting classes Used to declare the behavior of an implementing class Used to declare properties, methods, events, and fields as well FIelds cannot be declared using interfaces What is the meaning of AutoPostBack in.
- AutoPostBack is a property in the. NET framework, which provides automatic postback whenever an event starts its execution cycle. To use AutoPostBack, you have to set the property to True. What are the parameters that control connection pooling behaviors in. There are four main parameters that control connection pooling behaviors in. NET as given below: Connect Timeout.
- Question 5. Answer : The Entity Framework is a component of the. NET Framework starting with version 3. Question 6. What Is Csdl? Answer : Conceptual schema definition language CSDL is an XML-based language that describes the entities, relationships, and functions that make up a conceptual model of a data-driven application. The metadata that is described with CSDL is used by the Entity Framework to map entities and relationships that are defined in a conceptual model to a data source.
- Question 7. What Is Ssdl? In an Entity Framework application, storage model metadata is loaded from a. StoreItemCollection and is accessible by using methods in the System. MetadataWorkspace class. The Entity Framework uses storage model metadata to translate queries against the conceptual model to store-specific commands. Question 8. What Is Msl? Answer : Mapping specification language MSL is an XML-based language that describes the mapping between the conceptual model and storage model of an Entity Framework application. In an Entity Framework application, mapping metadata is loaded from an. The Entity Framework uses mapping metadata at runtime to translate queries against the conceptual model to store-specific commands.
- Question 9. What Is Entity Data Model? The EDM addresses the challenges that arise from having data stored in many forms. For example, consider a business that stores data in relational databases, text files, XML files, spreadsheets, and reports. This presents significant challenges in data modeling, application design, and data access. When designing a data-oriented application, the challenge is to write efficient and maintainable code without sacrificing efficient data access, storage, and scalability.
Top 20 Entity Framework Interview Questions - You Must Know In Detail
When data has a relational structure, data access, storage, and scalability are very efficient, but writing efficient and maintainable code becomes more difficult. When data has an object structure, the trade-offs are reversed: Writing efficient and maintainable code comes at the cost of efficient data access, storage, and scalability.Top 25 Entity Framework Interview Questions & Answers - Talent Economy
Even if the right balance between these trade-offs can be found, new challenges arise when data is moved from one form to another. The Entity Data Model addresses these challenges by describing the structure of data in terms of entities and relationships that are independent of any storage schema. This makes the stored form of data irrelevant to application design and development. And, because entities and relationships describe the structure of data as it is used in an application not its stored form , they can evolve as an application evolves. Question Answer : The Entity Data Model EDM uses three key concepts to describe the structure of data: entity type, association type, and property. These are the most important concepts in describing the structure of data in any implementation of the EDM.35 Entity Framework Interview Questions (ANSWERED + .NET Core Updates) For 2021
Entity Type: The entity type is the fundamental building block for describing the structure of data with the Entity Data Model. In a conceptual model, entity types are constructed from properties and describe the structure of top-level concepts, such as a customers and orders in a business application. Association Type: An association type also called an association is the fundamental building block for describing relationships in the Entity Data Model. In a conceptual model, an association represents a relationship between two entity types such as Customer and Order. Property: Entity types contain properties that define their structure and characteristics.- There are several advantages and disadvantages to Entity Framework. The pros of the Entity Framework are: It offers Auto Migrations and thus helps to modify and set up the database as it may permit the database to experience changes made in the model codes. Can shorten codes. It offers excellent prototypes. This enables the developers to write codes that happen to be object-oriented. Command the model form. It can complicate or perplex things and happens to be time-consuming. The syntax is complex and complicated. Unavailable for all RDMS. There are three kinds of inheritance that are supported by Entity Frameworks as follows: TPT or Table per Type: This technique depicts a separate or distinct table for all and every domain class. TPC or Table per Concrete Class: This technique depicts a single table for a lone concrete class, but excluding the abstract class. So, if one inherits the abstract class in innumerable concrete classes then the features of the abstract classes become a fragment of every table of the concrete class.
Entity Framework Interview Questions- Entity Framework Core Questions
Core Supporting Inheritance: For mapping, there are limited patterns of class hierarchy that may be depicted in a relational database. Net and Entity Framework? Entity Framework lowers development cost and time. It also helps the designers to visually develop models and delineating of the database. Moreover, Entity Framework offers the power to program a conceptual prototype. Net: ADO. Net components. Net functions on disjunction architecture. Data happens to hold as XML. Net is extremely swift and data may be collected in data sets.- Net also abstracts esoteric programming which is necessary for accessing a database. Implementation of the script will add 2 collected processes into the database. Choose those procedures from the functions list in the Add tab. Right-click on any blank portion on the Entity Framework developer and choose the Model browser. Save the StoreDBModel. It also comprises information that is utilized to supply the prototypes graphically by the ADO. Net Entity Data Model Designer. Hence, it includes every delineation detail regarding the process of object mapping with SQL tables. This section aid you in the mapping of your RDMS data formation and explain relationship, function, and entities respectively.
- Net to communicate with the database. LINQ to Entities: aids you to communicate opposed to the object prototype. The Object Services Layer: aids in inheritance, merging data, identity resolution, etc. The Entity Data Model: abstracts the relational or logical schema and reveals the fundamental schema of data utilizing conceptual prototype, storage model, and mapping model. How to create EDM? EDM or the Entity Data Model happens to be an expanded style of the Entity-relationship prototype which states the fundamental prototype of the data utilizing several modeling procedures.
- It also depicts a set of fundamentals that explains data formation disregarding its collected form. EDM is hence the connection between the database and the prototype. Choose the ADO. Net Entity Data Model arrangement or template. Add name and click on the Add button. Lazy Loading is a process of collection of entities or a single entity that is loaded spontaneously for the first time from the database and property that refers to those entities or entities can be accessed. In other words, lazy loading means delaying the loading of related data, until it is specifically requested. While loading the POCO type of entities, lazy loading is produced by generating derived proxy type instances. Lazy loading then overrides the virtual properties to insert the hook of the loading. If the configuration is defined as the default and proper instruction is not given to the entity framework in a query, then it will return the lazy loading only.
Entity Framework Interview Questions And Answers | Medicoguia.com
The Difference between Model-First and code first approach. In code first approach, the entity framework does not include any configuration file like edmx file for storing the schema of the database. Code first approach is used for the fast development of the codes and developers have full control of the entire entities. In model first approach there is no existing database that offers the designer to create a conceptual data model. It implies. In this approach, manual changes to the database cannot be done as the model defines the database.- The model first approach goes well with the power pack database Generation installed. The entity framework can be connected to the SQL Server in the following way: A console application is to be created Create a class by right click on the application Create the variables of the class and set the required properties Save the class Add one more class in the same way Right-click and create a new folder for generating the Framework Dynamic Link Library DLL The folder can be renamed as the developer wants Save the application before adding any framework Right-click the Program. Config file In the main program, declare the context and objects Press F5 to execute 14 How to prevent sql injection in entity framework?
- The SQL injection is a technique for code injection that can attack data-driven applications and can destroy the database. The SQL injection is one of the most commonly used web hacking procedure that injects malicious codes in the SQL statements through the input of the web page. This happens due to the passing of all data to the database through the QL parameters. LINQ queries are not susceptible to the attacks by SQL injection as they are made by implying concatenation or manipulation of the string. Complex types are scalar properties that consist of different types of entities that enable the scalar elements to be organized within the required entities.
- Complex types do not include keys and thus exist independently. It cannot participate actively in the associations and do not have navigation properties. The properties of the complex type cannot be null. Scalar properties can be null of the complex objects. A complex type cannot inherit anything from the other complex types. The complex type must be defined as the class. When DbContext. DetectChanges is called, Entity framework detects changes on an object of the complex type in the members. Dapper is a microframework for a simple object mapper that maps the output of the native query to a domain or a c class. Dapper is a high-performance system for data access that is built by StackOverflow and is released as an open-source.
- It is very easy to fire a query in SQL against the database and to map the result into the C domain class. It extends the IDbconnection interface that is available in the System. Data namespace. Dapper includes many methods for the extension of the data access and mapping the result defined under the class SqlMapper found under the namespace of the dapper. Fluent API is a way of specifying the configuration of the model that covers everything executed by the annotations of the data. Fluent API and data annotations may be used together, but more preference is given by the Code First to Fluent API, then data annotations and finally to the default conventions. Fluent API is a way to configure the domain classes.
Ultimate List Of Entity Framework Interview Questions - Chubby Developer
Fluent API allows the user to configure the properties of the entities. Proxy Objects act as an intermediary between an accessible object and the client. Proxy Objects monitors the lifespan of the accessible objects and forwards the calls to the objects when it is not destroyed. Proxy objects check the availability of accessible objects whenever a client calls an IAccessible property to know proper information about the object.Interview Questions On Linq To Entity Framework - Entity Framework Interview Questions
The proxy object passes the requests of the client to the accessible object. When an accessible object is not present or is destroyed, an error is returned by the proxy object. The proxy object is always clear to the client. Lazy loading can be turned off for a particular context or an entity. To turn off the lazy loading for a specific property, do not convert it to the virtual. To disable the lazy loading for the entire entities in a context, the configuration property must be set to false.Medicoguia.com Entity Framework Interview Questions - CodeProject
Now let us see the ways for turning off the lazy loading. ProxyCreationEnabled should be true. LazyLoadingEnabled should be made true. Navigation property should not be defined as virtual and public. The context will do the lazy loading if the property is defined as virtual. Migration History Table is utilized by Code First Migrations to collect details regarding migrations that are required to apply to the Database. However, this utilization of it has been altered in Entity Framework 6 and Migration History Table is no more a salient system table. Eager loading happens to be a procedure where a query for a single kind of entity also charges related entities as a fragment of the query. Eager loading can be attained by the utilization of the Include process. It depicts that appealing related data to be sent back along with query outcomes from the Database. There is only a lone communication made to the data origin, a huge amount of data is sent back in the starting query.
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