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C# Note You don t have to worry about this when you use iterators the compiler will automatically generate a thread-safe implementation of IEnumerator. Every call to your iterator method executes all the code before, between, and after every yield return, in the thread that is doing the enumeration.

Caution You must select the field from the Insert Formula dialog by clicking the Insert Field or Group button and then selecting the field. You cannot simply enter the name of the field in the text box shown in Figure 9-11.

12. On the Site Settings page, select Administration Go to Site Administration. 13. On the Top-Level Site Administration page, select Management and Statistics Save Site as Template. 14. On the Save Site as Template page, name the new template Sports Team. Give it a file name and description. 15. Note that this page would allow you to save the site content as part of the template, if you wished. Click OK to finish. Once you have created saved templates for a site collection, you can go back and manage the templates. Accessing the set of templates for a site collection is done through the Top-Level Site Administration page. On this page select Site Collection Galleries Manage Site Template Gallery. This will show you a list of all templates for the site collection excluding the default templates. From this list, you can edit the template properties or delete the template altogether.

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Collections should implement IEnumerable and may add IEnumerable members All the FCL collection classes in this chapter can be directly enumerated That is, you can write a foreach (int I in IntList) just like you can write IntList[Index] or IntListAdd(Value) This means that they implement GetEnumerator by creating a tiny object that pairs a reference to the collection with an index into the collection I hesitate to say all collections should implement GetEnumerator directly, but I can t imagine why one wouldn t A collection should only have properties or methods that return an IEnumerable when it needs secondary ways of enumerating itself For example, the Hashtable and the Dictionary<,> have a primary enumerator that supplies key/value pairs, along with secondary enumerators that supply only Keys or only Values In a Hashtable or Dictionary<,>, all three enumerators show different aspects of the same data.

Figure 9-11. Complete the rule details. Now complete the definition of the rule by clicking the OK button. Next, you can go through the Add Rule command a second time selecting the same IF expression, but this time select Bad under formatting. This option will format the field value with red text on a light red background, making it obvious to the user that the value is incorrect. When the user corrects the problem, the field style reverts to the default black text on a white background so you do not have to create a special rule for corrected values. Rather than select the Add Rule command, you can also select the Manage Rules button in the Rules group to open a panel along the right side of the screen that shows all of the currently defined rules for the selected field as shown in Figure 9-12.

You can, of course, create synthetic, or manufactured, enumerations as in the 12\Sorted C# project, which adds a Sorted() method to a List<> descendant: public IEnumerable<T> Sorted(Comparison<T> comparison) { List<T> Copy = new List<T>(this); if (comparison == null) CopySort(); else CopySort(comparison); return Copy; } Perfectly straightforward code that takes a snapshot by adding each enumeration element to a new list; sorts the snapshot; and returns the snapshot as an IEnumerable<T> But notice how Sorted only uses this as an IEnumerable<T>: this Sorted method doesn t know anything about its host that s not true of every class in this chapter, which makes it a good candidate for a library class The 12\ShemitzCollections C# project shows an Operator class that can sort, reverse, or shorten IEnumerable<T> enumerations For example, you use this Sorted method by saying foreach (T Item in Operator.

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