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difference between for and for each loop..?

The for loop executes a statement or a block of statements repeatedly until a specified expression evaluates to false. there is need to specify the loop bounds( minimum or maximum).

int j = 0;

for (int i = 1; i <= 5; i++)

{

j = j + i ;

}

The foreach statement repeats a group of embedded statements for each element in an array or an object collection.you do not need to specify the loop bounds minimum or maximum.

int j = 0;

int[] tempArr = new int[] { 0, 1, 2, 3, 5, 8, 13 };

foreach (int i in tempArr )

{

j = j + i ;

}

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What is the difference between for-loop container and foreach-loop container in ssis?

foreach loop executes a predetermined number of times eg. list of items, rows in a table, etc. a for loop executes until a certain condition is met


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Foreach is for an IEnumerable, not just an array (unless you are using C# 1.1 or earlier). A collection (List, Dictionary, etc) can also generate a sequence from foreach-statement. In fact, if you have a class that is NOT an array, but it implements all the required methods of IEnumerable, it may be applied as:public class Storage: IEnumerable {...}Storage myStorage = new Storage();...Foreach (Thing stuff in myStorage){...}


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What is IEnumerable?

I understand the IEnumerator/IEnumerable methods and properties and also how they are interrelated. But I fail to understand from the foreach loop perspective. Say for example, if I say the following line of code, how does the compiler look at foreach loop and break it down to IEnumerable/IEnumerator for every occurance of foreach loop in your code. In other words, what happens under the hood? I tried to go through couple of articles on the web. But they were NOT looked from the foreach loop perspective or I might have failed to understand. Could somebody explain with the example or direct me to any articles that explains clearly. All help is greatly appreciated.Answer: To keep it short the compiler doesn't do much. It just translates the foreach code into a while under the hood. Here's an example: List list = new List; ........ foreach(int item in list) { //Do stuff} Becomes: Enumerator enum = ((IEnumerable)list).GetEnumerator(); enum.Reset(); while(enum.MoveNext()) { int item = enum.Current;//Do stuff} or something very close to that. The acual code compiled most likely has a try / finally block around the while to dispose the enumerator

Related Questions

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Is it mandatory to use array in foreach loop C-sharp can foreach be used without array?

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