why do we need Yield Keyword in C#?

suppose you have a list of Integers List numbers=new List{1,2,3,4,5,6,7,8,9,10};
now you are asked to create a method to return all numbers greater than 7 , and you are not allowed to use Linq.
so when we are not allowed to use Linq , then creating a method which return some entity out of many , unnecessarily forces us to create another temperory List to hold such values
ex

public List<int> NumsGeraterThan7(List<int> numbers)
{
List<int> temp=new List<int>();
foreach(int i in numbers){
if(i>7){
temp.Add(i)
}
return temp;
}

As you can see , we are unnecessaryliy creating Temperory List.
Yield solves this problem

public List<int> NumsGeraterThan7(List<int> numbers)
{
foreach(int i in numbers){
if(i>7){
yield return i;
}
}

so , you can see we are not creating temperory List.
How Yield successfully solves the problem?
Ans:- Yield does stateful iteration , meaning it remembers the last location from where he has to iterate everytime.

1 Reply

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Sachin Singh5y ago
Accepted answer
suppose you have a list of Integers List
numbers=new List{1,2,3,4,5,6,7,8,9,10};
now you are asked to create a method to return all numbers greater than 7 , and you are not allowed to use Linq.
so when we are not allowed to use Linq , then creating a method which return some entity out of many , unnecessarily forces us to create another temperory List to hold such values
ex
public List<int> NumsGeraterThan7(List<int> numbers)
{
  List<int> temp=new List<int>();
  foreach(int i in numbers){
if(i>7){
  temp.Add(i)
}
return temp;
}

As you can see , we are unnecessaryliy creating Temperory List.
Yield solves this problem
public List<int> NumsGeraterThan7(List<int> numbers)
{

  foreach(int i in numbers){
if(i>7){
  yield return i;
}

}

so , you can see we are not creating temperory List.
How Yield successfully solves the problem?
Ans:- Yield does stateful iteration , meaning it remembers the last location from where he has to iterate everytime.
+2