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#1,115 – Iterating Through a Collection Using the foreach Statement
In the same way that you can iterate through an array using foreach, you can iterate through the elements of a collection one at a time. You do this by writing a loop–a block of code that is executed...
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#1,116 – Iterating Through a String Using the foreach Statement
You can iterate through the individual characters in a string using the foreach statement. The iteration variable is of type char and is set consecutively to each character within the string as the...
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#1,117 – foreach Requires IEnumerable Implementation
The foreach statement works on an object that implements IEnumerable<T> or IEnumerable. It also works on an object whose type has a public GetEnumerator method that returns an...
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#1,118 – foreach Works with Iterator Returned by yield
You can use the yield keyword in a method to implement an iterator. The method in which it is defined returns an IEnumerable or IEnumerator. The resulting iterator can be consumed using the foreach...
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#1,119 – Scope of Iteration Variable Is Limited to Body of foreach
The iteration variable that is set to a new element during each pass of a foreach statement only has scope within the body of the foreach loop. It may not be used or referenced outside of the loop....
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#1,120 – The Iteration Variable in a foreach Loop Is Read-Only
Unlike the for loop, the iteration variable in a foreach loop is read-only. Attempting to assign a value to the variable within the body of the loop will result in a compile-time error. string[] dogs...
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#1,121 – Modifying Elements in a Collection Using foreach
Although the iteration variable in a foreach loop is read-only, you can still use the iteration variable to modify the elements of a collection, as long as they are reference-typed. (Value-typed...
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#1,122 – It’s Okay to Capture Variables within a foreach Loop
Within a foreach loop, you capture an iteration variable when you save it for later use. In versions of C# earlier than 5.0, this led to problems and unexpected behavior. What ended up being captured...
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#1,123 – Using foreach to Iterate on a Multidimensional Array
You can use the foreach statement to iterate through all elements in a multidimensional array. The elements are iterated in a row-major order. That is, all elements in the first row are enumerated,...
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#1,124 – Iterate through Jagged Array with Nested foreach
You can’t use the foreach statement to directly iterate over all elements in a jagged array. You can, however, iterate through the jagged array using nested foreach statements. Each foreach statement...
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