C# (CSharp) ENTITIES Examples

Programming Language: C# (CSharp)

Class/Type: ENTITIES

Examples at hotexamples.com: 3

C# Entities are classes that represent data in a database. They are used with Entity Framework, a popular Object-Relational Mapping (ORM) tool that simplifies database interaction by providing a way to manipulate database objects using object-oriented programming concepts.

Example 1:

In this example, we can create a C# Entity class to represent a table in a database.

using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

[Table("Students")]
public class Student
{
    [Key]
    public int Id { get; set; }

    [Column("Full_Name")]
    public string Name { get; set; }

    [Required]
    public int Age { get; set; }
}

This entity represents a table called "Students" with columns for "Id", "Full_Name" and "Age". The "Key" attribute identifies "Id" as the primary key and the "Required" attribute ensures "Age" must be present in any new instance of the object.

Example 2:

In this example, we can use C# Entities to retrieve data from a database:

using System.Collections.Generic;
using System.Linq;

public class StudentRepository
{
    private readonly SchoolContext _context;

    public StudentRepository(SchoolContext context)
    {
        _context = context;
    }

    public List GetStudentsByAge(int age)
    {
        return _context.Students.Where(s => s.Age == age).ToList();
    }
}

Here, we have a repository class that utilises a C# Entity called "Student". We pass the context into the constructor and use the LINQ method "Where" to filter all students with a particular age. The method returns a list of student objects. Package library: Entity Framework Core.

C# (CSharp) ENTITIES - 3 examples found. These are the top rated real world C# (CSharp) examples of ENTITIES extracted from open source projects. You can rate examples to help us improve the quality of examples.

Frequently Used Methods

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Construct(1)

Example #1

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File: EntityStorage.cs Project: sleepy-monax/hevadea-monogame

        public Entity ConstructEntity()
        {
            var entity = ENTITIES.Construct(Type);

            entity.Load(this);

            return(entity);
        }

Example #2

Show file

File: Entity.cs Project: lewisclement/KBSGameGroep3

 public Entity(ENTITIES type, PointF location, int spriteID, bool solid = false, Byte height = 50, Byte drawOrder = 8, float boundingBox = 1.0f)
 {
     this.type = type;
     this.location = location;
     this.height = height;
     this.drawOrder = drawOrder;
     this.boundingBox = boundingBox;
     this.spriteID = spriteID;
     this.solid = solid;
     this.ID = entityID++;
 }

Example #3

Show file

File: World.cs Project: lewisclement/KBSGameGroep3

 /// <summary>
 /// Gets all entities by given ENTITIES type
 /// </summary>
 /// <param name="type"></param>
 /// <returns>All entities with given type</returns>
 public List<Entity> getEntitiesByType(ENTITIES type)
 {
     List<Entity> returnEntities = new List<Entity> ();
     foreach (Entity e in objects) {
         if (e.getType () == type)
             returnEntities.Add(e);
     }
     return returnEntities;
 }