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If you don t declare a public, no-parameter constructor, your descendant classes constructors have to explicitly inherit construction from a constructor that does take parameters. Which lets me finally lay the No overload ... takes '0' arguments message to rest. The Tree class didn t define a no-parameter constructor, because it wanted to always set both links in the constructor. When the first ExpressionTree example didn t explicitly call a base constructor it implicitly called base() even though it absolutely doesn t look that way. This was violating the Tree semantics that don t include a no-parameter constructor, because both links should always be set in the constructor which is part of why there was so much duplicated code in the first ExpressionTree example and why the second ExpressionTree example is so much smaller. The semantics violation led to the error message: the first ExpressionTree example doesn t compile because there are no no-parameter constructors. There are no no-parameter constructors because Tree wants to always set both links in the constructor. In young, rapidly evolving code, the No overload ... takes '0' arguments message may be a signal that you haven t thought through your base class thoroughly; that you need to add a noparameter constructor. However, library code has generally been both thought through and tested, and if you get this message descending from library code, it s more likely to be the case that you don t understand the library classes than it is to be the case that a library class fails to include a constructor that it should.

Figure 4-38. Create a separate document set for each employee. Once you have created the document set, you can open any of the sets and work with the documents individually just as if they were in a more traditional file folder. However, the productivity enhancements come about due to the ability to treat the entire multi-document set as a single object when you want to move or delete the set, start a workflow for the set, or archive the entire set to a records center. You can even manage the permissions of the document set independent of the library that contains the document set. To work with a document set, click on the document set to open its Welcome page as shown in Figure 4-39. From this screen, you can modify its properties or work with any of the documents defined to be part of the document type.

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A constructor for a struct is a special method that must set all fields A struct object can have constructors just like class objects can, and can use the : this() syntax to inherit construction from a peer constructor. A struct cannot use field initializers, and cannot have an explicit parameterless constructor. Calling new StructName() will initialize all fields to 0 or null. Note that this is different than declaring a struct field or variable without calling new, which allocates space but leaves it uninitialized. A struct constructor must set all fields before returning, directly or by inheritance, but the compiler won t see settings in normal methods that the constructor calls e.g., you have to inline Reset(), not call it. Note that in Delphi for .NET, when you Create() a record variable like var R: MyRecord; R := MyRecord.Create(X, Y, Z); you are getting a copy operation: since Delphi doesn t require that a record constructor set every field, the MyRecord.Create(X, Y, Z) compiles to a newobj CIL instruction, which creates a new record on the stack; initializes all fields to 0/Nil; calls the constructor; and then copies it to R. The equivalent C# syntax MyStruct S = new MyStruct(X, Y, Z); constructs in place it does not do a copy the way DfN does. The constructor receives a pointer to the new struct as its implicit this reference in pretty much the same way as any other method.

Figure 4-39. Default welcome page for the Annual Review Documents document set This introduction to the document set will get you started. You can also add more columns to your document set, and you can customize the appearance of the Welcome page for the document set.

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