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In addition to the DataRow-specific comparer class for the set-type operators, there is a need for some DataRow-specific operators. These operators are defined in the System.Data.DataSetExtensions.dll assembly, in the static System.Data.DataRowExtensions class. You have no doubt noticed that in virtually every example thus far, I have used the Field<T> operator to extract a DataColumn object s value from a DataRow. There are two purposes for this operator: correct equality comparisons and null value handling. With DataRow objects, we have a problem. Their DataColumn values do not get compared properly for equality when they are accessed with the DataRow object s indexer if the column is a value-type. The reason is that because the column s data type could be any type, the indexer returns an object of type System.Object. This allows the indexer to return an integer, a string, or whatever data type is necessary for that column. This means that if a column is of type int, it is a value-type, and it must get packaged into an object of type Object. This packaging is known in the Microsoft .NET Framework as boxing. Pulling the value-type back out of the object is known as unboxing. This boxing is where the problem lies. Let s take a look at some sample code. First, let s take the example of comparing an integer literal to another integer literal of the same value, as shown in Listing 10-7. Listing 10-7. Comparing 3 to 3 Console.WriteLine("(3 == 3) is {0}.", (3 == 3)); The following is the result of this code:

<bean id="authenticationDao" class="org.springframework.security.userdetails.jdbc.JdbcDaoImpl"> <property name="dataSource" ref="dataSource"/> <property name="userByUserNameQuery" > <value> SELECT username, password, enabled FROM users WHERE username= </value> </property> <property name="authoritiesByUserNameQuery" > <value> SELECT username, authority FROM authorities WHERE username= </value> </property>

On the Greetings tab of the Properties dialog box, you set up the greeting and main menu prompts, as shown in Figure 7-5. For each prompt, you can specify a .wav file that contains your recorded custom message.

(3 == 3) is True. There is absolutely no surprise there. But what happens when an integer gets boxed Let s examine the code in listing 10-8 and look at the results. Listing 10-8. Comparing 3 Cast to an Object to Another 3 Cast to an Object Console.WriteLine("((Object)3 == (Object)3) is {0}.", ((Object)3 == (Object)3)); And the following are the results:

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Uh oh, what happened What happened is that by casting the literal integer 3 to an object of type Object, two objects were created, and the references (addresses) of each object were compared, and those are not equal When you access DataColumn objects using the DataRow object s indexer, if any of the columns are a value-type, the column values will get boxed and will not compare for equality properly To demonstrate this, I ll create a more complex example that actually uses DataColumn objects In the example, I have two arrays, each of a different class type One is the same basic array of students I have been using The other is an array of class designations with foreign keys into the students array Here is the StudentClass class.

If your tables and column names were different, it is possible to supply your custom queries by overriding the userByUserNameQuery and authoritiesByUserNameQuery properties. You need to use proper aliases for the columns that have different names than the default tables because Spring retrieves data from the resultset using default column names. eInsure used the e-mail address instead of the username and role in the place of authority. Listing 6-12 shows the configuration of the custom queries with aliases.

A Simple Class with Two Public Properties class StudentClass { public int Id; public string Class; } Now that I have a different class type, I am going to need another method to convert this array to an object of type DataTable Here is that method: static DataTable GetDataTable2(StudentClass[] studentClasses) { DataTable table = new DataTable(); tableColumnsAdd("Id", typeof(Int32)); tableColumnsAdd("Class", typeof(string)); foreach (StudentClass studentClass in studentClasses) { tableRowsAdd(studentClassId, studentClassClass); } return (table); } This method is nothing more than a copy of the existing common GetTableData method that has been modified to work with arrays of StudentClass objects Obviously, if you were going to be working from arrays in real production code, you would want something more abstract than creating a method for each class type for which you need a DataTable object Perhaps a generic extension method would be a nice approach.

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