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C# 2.0 Yield Return Iterator
By
Matthew Cochran April 04, 2006
One interesting new feature of the C# 2.0 is the “yield” keyword. Basically it is used to iterate through objects returned by a method. It creates a state engine in IL so you can create methods that retain their state and don’t have to go through the pain of maintaining state in your code.
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Description
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A Programmer's Introduction to C# 2.0, Third Edition is a critical update to the highly successful second edition. It is written by a member of the original C# language-design team and a C# program manager, so you can be certain this book contains the expertise you're looking for.
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One interesting new feature of the C# 2.0 is the "yield" keyword. Basically it is used to iterate through objects returned by a method. It creates a state engine in IL so you can create methods that retain their state and dont have to go through the pain of maintaining state in your code.
Here is a simple example that demonstrates how yield return can be used to maintain state in a method. Every time you call GetInt() you will receive a new incremented integer.
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public static IEnumerable<int> GetInt()
{
for (int i = 0; i < 5; i++)
yield return i;
} |
Here's the implementation.
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class Program
{
static void Main(string[] args)
{
foreach (int i in GetInt())
Console.WriteLine("Got " + i.ToString());
}
public static IEnumerable<int> GetInt()
{
for (int i = 0; i < 5; i++)
yield return i;
}
} |
Usually, the "yield" keyword will be useful when you implement the GetEnumerator() method of the IEnumerable interface
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class TestClass: IEnumerable<int>
{
#region IEnumerable<int> Members
public IEnumerator<int> GetEnumerator()
{
for (int i = 0; i < 5; i++)
yield return i;
}
#endregion
#region IEnumerable Members
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
#endregion
} |
Hopefully, this brief sample has helped you understand the new "yield" keyword and how it can be used.
Until next time,
Happy coding
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