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A struct is a user-defined data type that is very similar to a class; it can contain constructors, fields, methods, and properties. Structs are declared using the struct keyword instead of class. As a quick reference, here are the notable differences between structs and classes: A struct is a value type, whereas classes are reference types. Internally, structs are implicitly derived from System.ValueType. Inheritance doesn t work with structs. A struct cannot derive from a class or from another struct; a class cannot derive from a struct. Structs always contain by default a parameterless, default constructor, which does nothing. You re allowed to add more overloads, but you can t add a parameterless constructor. Although structs are very powerful, they are mainly designed to act as containers for data rather than as fully featured objects. Because they are value types (and are stored on the stack), passing them around can be very fast. MSDN says that data structures smaller than 16 bytes may be handled more efficiently as structs than as classes.

In the examples in previous chapters, we created a collection of objects using an array, like this:

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You wrap the department s name and description into one DepartmentDetails object and send it back to the presentation tier. The DepartmentDetails class can be added in a separate file in the App_Code folder or added to one of the existing files. Most of the time, you ll want to create a separate file for each class, but because in this case DepartmentDetails is more like a tool for the CatalogAccess class, we chose to add it to CatalogAccess.cs. Add the DepartmentDetails class at the beginning of CatalogAccess.cs (but not inside the CatalogAccess class) like this: using System; using System.Data; using System.Data.Common; /// <summary> /// Wraps department details data /// </summary> public struct DepartmentDetails { public string Name; public string Description; } /// <summary> /// Product catalog business tier component /// </summary> public static class CatalogAccess

MyType[] array = new MyType[10]; array[0] = new MyType(); array[2] = new MyType(); This creates an array that can contain 10 elements at most (MyType[10]). If you needed to store 20 elements, you would need re-create the array, and copy the references from the old array to the new array. Another feature of an array is that you don t need to assign the elements in a sequential manner. The example assigns the first and third positions, with the second position being null. Thus, some code that iterates the array will need to verify that the array element is not null. The sample code generates the structure illustrated in Figure 8-2.

This worksheet contains the following information: Column A (cells A4 through A17) is the same as the Race Paces 1 worksheet, displaying the number of miles, 1 through 13.1. Columns B through J (cells B4 through J17) will display the average number of minutes to run the various distances at the race paces in cells B3 through J3. Use a two-variable data table to calculate the average amount of time it would take to run from 1 through 13.1 miles at 5-minute-per-mile through 9-minute-per-mile paces, in halfminute increments. 1. Select cells A3 through J17. 2. Click Data Table. 3. Click Row Input Cell. 4. Click cell A2. 5. Click Column Input Cell. 6. Click cell A1. 7. Click OK. Compare your results to Figure 5-7.

Now add the GetDepartmentDetails method to the CatalogAccess class. The exact location doesn t matter, but to keep the code organized, add it just after the GetDepartments method: // get department details public static DepartmentDetails GetDepartmentDetails(string departmentId) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "CatalogGetDepartmentDetails"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@DepartmentID"; param.Value = departmentId; param.DbType = DbType.Int32; comm.Parameters.Add(param); // execute the stored procedure DataTable table = GenericDataAccess.ExecuteSelectCommand(comm); // wrap retrieved data into a DepartmentDetails object DepartmentDetails details = new DepartmentDetails(); if (table.Rows.Count > 0) { details.Name = table.Rows[0]["Name"].ToString(); details.Description = table.Rows[0]["Description"].ToString(); } // return department details return details; } You know what happens in this function fairly well because we analyzed portions of it in the first part of the chapter. Its main purpose is to send back the name and description of the relevant department. To do this, it calls the CatalogGetDepartmentDetails stored procedure, supplying it with a department ID. After execution, the function reads the @DepartmentName and @DepartmentDescription output parameters, saves them into a DepartmentDetails object, and sends this object back to the calling function.

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