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Figure 9-8. The new Announcements form with the addition of a Publish Date column Now suppose you want to make sure that for every announcement added to the list, the publish date occurs before the expiration date. Because these are simple date fields, you would have no way to enforce this rule. However, InfoPath lets you define validation rules for your form fields. First, click in the field for which you want to add a rule. Then you can click the Add Rule button in the Rules group of the Home ribbon as shown in Figure 9-9.

13. If you have an enumerator that s expensive to construct, perhaps because it has to connect to a server, you might want to maintain an enumerator pool (as in the 12\Pooling C# project) so that you can Reset() the enumerator instead of re-creating it. 14. As a special case, it is OK to implement IEnumerable and IEnumerator on a private object that can only be obtained through a thread-safe static method, if that static method can guarantee it will never reissue an instance that is still being enumerated. See, for example, the 12\Pooling C# project.

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Figure 9-9. Add a rule to the form. This command displays a drop-down list of possible rule expressions as shown in Figure 9-10. For example, if you start from the Publish Date, you could choose the Is After option because you want to raise an error when the Publish Date is after the Expires date. As you position your mouse over your desired IF expression, a second menu appears next to the first that shows you the actions and formatting you can use. In this case, let s begin by selecting the Show Validation Error action.

From the Site Directory, click the Create Site link under the Actions list 4 Name the new site Softball Team and give it a description 5 Type in a web site address for the new site and click Create 6 On the Add Link to Site page, click OK 7 On the Template Selection page, select to base this site on the Team Site template and click OK 8 When the new site is created, select Modify Shared Page Add Web Parts Browse in the upper-right corner of the page 9 On the Web Parts pane, drag the Members Web Part onto the page 10 When you have finished modifying the site, click the Home link 11 From the Home page, click Site Settings..

private int[] Data = new int[] { 1, 2, 3, 4, 5 }; private int Pointer = -1; public object Current { get { return Data[Pointer]; } } public bool MoveNext() { return ++Pointer < Data.Length; } public void Reset() { Pointer = -1; } } There are two problems with this code, and neither may be immediately obvious. In fact, foreach (int Item in new Wrong()) will even work as expected. What won t work, though, is Wrong W = new Wrong(); foreach (int Item in W) Console.Write(Item); foreach (int Item in W) Console.Write(Item); The preceding code will write 12345, not the 1234512345 that you might have expected. Neither foreach loop calls Reset, so the second foreach loop s while (MoveNext()) never executes the loop body. If you ran into this problem implementing a class that may be enumerated again and again, like an ArrayList or a Dictionary<>, you might simply change your IEnumerable. GetEnumerator implementation to public IEnumerator GetEnumerator() { Reset(); return this; }. However, while resetting this before returning it does mean that you can enumerate the collection more than once, it doesn t do anything for the second problem an enumerable that s also an enumerator will get horribly jumbled if one thread calls GetEnumerator while another thread is still enumerating the collection. GetEnumerator should almost always return a new object. As per 2, this is often a private, nested class that contains just a reference to the object that actually contains the data, and a pointer into the dataset for MoveNext to advance and for Current to read.

In the Rule Details dialog, you can enter an absolute value to which you can compare the Publish Date field, or you can click the function button to select a field as shown in Figure 9-11.

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