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Use of Partial keyword?

Posted By :Krishna     Posted Date :July 15, 2013    Points :40   Category :.NET Framework 
"Partial" keyword was introduced in framework 2.0,which is used to split single class into into n-number of class files with same class name.



You can also find related Interview Question to Use of Partial keyword?  below: 

Yield keyword in C Sharp

  
C Sharp and yield keyword

Hi,



One of the cool and yet most unknown feature of the C# is the yield keyword. The yield keyword is used in an iterator block to provide a value to the enumerator object or to signal the end of the iteration. When used the expression is evaluated and returned as a value to the enumerator object. Note the expression has to be implicitebly convertible to yield type of the iterator. Here is an example



public static IEnumerable GetIntCollectionFromString(string SomeString){ string[] val = SomeString.Split(' '); int intToAdd; foreach (string token in val) { if (int.TryParse(token, out intVal)) { yield return intVal; } else { yield break; } }}

Here since we are using the yield keyword the function will return the collection of intVal instead of the value of intVal. The statement will only return when the iteration of the loop is complete.



There are some limitation with the yield keywords.

Unsafe blocks are not allowed
Parameters to the method, operator, or accessor cannot be ref or out. (More...)

What is Partial Class?

  
Partial class:
---------------

Instead of defining an entire class, you can split the definition into multiple classes by using the partial keyword. When the application is complied, the C# complier will group all the partial classes together and treat them as a single class. There are a couple of good reasons to use partial classes. Programmers can work on different parts of a class without needing to share the same physical file. Also you can separate your application business logic from the designer-generated code.

C#

Public partial class Employee
{
public void Method1()
{}
}

Public partial class Employee
{
public void Method2()
{}
} (More...)

What is the use of param keyword in C#?

  
In C# param parameter allows us to create a method that may be sent to a set of identically typed arguments as a single logical parameter. (More...)

What is the use of unsafe keyword in C#?

  
In C# the value can be directly referenced to a variable, so there is no need of pointer. Use of pointer sometime crashes the application. But C# supports pointer, that means we can use pointer in C#.

The use of pointer in C# is defined as a unsafe code. So if we want to use pointer in C# the pointer must be present in the body of unsafe declaration. But pointer does not come under garbage collection.

Example:-

unsafe
{
int a, *b;
a = 25;
b = &a;
Console.WriteLine("b= {0}",b);//returns b= 25
} (More...)

what is the purpose of "base" keyword in c# ?

  
There are two uses
1) used to access a base class constructor
2) used to access a base class member in the derived class. (More...)

What is the use of stackalloc keyword in C#?

  
In an unsafe context it is used to allocate C# array directly on the stack. (More...)

C# delegate keyword is derived form which namespace?

  
C# delegate keyword is derived form System.MulticastDelegate. (More...)

Why 'static' keyword is used before Main()?

  
Program execution starts from Main(). S it should be called before the creation of any object. By using static the Main() can now be called directly through the class name and there is no need to create the object to call it. So Main() is declared as static. (More...)

What is the keyword used in VB to carry out the work of virtual keyword of C#?

  
The Overridable keyword. It declare a method to support polymorphism. (More...)

Equivalent keyword of new in VB?

  
Shadow keyword is used to hide a method from a base class. (More...)

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