Standard Query Operators in C#.NET

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Inner
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Figure 143: Venn Diagram of Inventor and Patent Collections
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particular example, a right outer join would be the same as an inner join since there are no patents without inventors Furthermore, the designation of left versus right is arbitrary, so there is really no distinction between left and outer joins A full outer join, however, would include records from both outer sides; it is relatively rare to perform a full outer join Another important characteristic in the relationship between inventors and patents is that it is a many-to-many relationship Each individual patent can have one or more inventors (the flying machine s invention by both Orville and Wilbur Wright, for example) Furthermore, each inventor can have one or more patents (Benjamin Franklin s invention of both bifocals and the phonograph, for example) Another common relationship is a one-to-many relationship For example, a company department may have many employees However, each employee can belong to only one department at a time (However, as is common with one-to-many relationships, adding the factor of time can transform them into many-to-many relationships A particular employee may move from one department to another so that over time, she could potentially be associated with multiple departments, making another many-to-many relationship)
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14: Collection Interfaces with Standard Query Operators
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Listing 1420 provides a sample listing of Employee and Department data, and Output 147 shows the results
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Listing 1420: Sample Employee and Department Data
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public class Department { public long Id { get; set; } public string Name { get; set; } public override string ToString() { return stringFormat("{0}", Name); } } public class Employee { public int Id { get; set; } public string Name { get; set; } public string Title { get; set; } public int DepartmentId { get; set; } public override string ToString() { return stringFormat("{0} ({1})", Name, Title); } } public static class CorporateData { public static readonly Department[] Departments = new Department[] { new Department(){ Name="Corporate", Id=0}, new Department(){ Name="Finance", Id=1}, new Department(){ Name="Engineering", Id=2}, new Department(){ Name="Information Technology", Id=3}, new Department(){ Name="Research", Id=4}, new Department(){ Name="Marketing", Id=5}, };
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public static readonly Employee[] Employees = new Employee[] { new Employee(){ Name="Mark Michaelis", Title="Chief Computer Nerd", DepartmentId = 0}, new Employee(){ Name="Michael Stokesbary", Title="Senior Computer Wizard", DepartmentId=2}, new Employee(){ Name="Brian Jones", Title="Enterprise Integration Guru", DepartmentId=2}, new Employee(){ Name="Jewel Floch", Title="Bookkeeper Extraordinaire", DepartmentId=1}, new Employee(){ Name="Robert Stokesbary", Title="Expert Mainframe Engineer", DepartmentId = 3}, new Employee(){ Name="Paul R Bramsman", Title="Programmer Extraordinaire", DepartmentId = 2}, new Employee(){ Name="Thomas Heavey", Title="Software Architect", DepartmentId = 2}, new Employee(){ Name="John Michaelis", Title="Inventor", DepartmentId = 4} }; }
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class Program { static void Main() { IEnumerable<Department> departments = CorporateDataDepartments; Print(departments); ConsoleWriteLine(); IEnumerable<Employee> employees = CorporateDataEmployees;
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14: Collection Interfaces with Standard Query Operators
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Print(employees); } private static void Print<T>(IEnumerable<T> items) { foreach (T item in items) { ConsoleWriteLine(item); } } }
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OUTPUT 147:
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Corporate Finance Engineering Information Technology Research Marketing Mark Michaelis (Chief Computer Nerd) Michael Stokesbary (Senior Computer Wizard) Brian Jones (Enterprise Integration Guru) Jewel Floch (Bookkeeper Extraordinaire) Robert Stokesbary (Expert Mainframe Engineer) Paul R Bramsman (Programmer Extraordinaire) Thomas Heavey (Software Architect) John Michaelis (Inventor)
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We will use the same data within the following section on joining data
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Performing an Inner Join with Join() In the world of objects on the client side, relationships between objects are generally already set up For example, the relationship between files and the directories in which they lie are preestablished with the DirectoryInfoGetFiles() method and the FileInfoDirectory method Frequently, however, this is not the case with data being loaded from nonobject stores Instead, the data needs to be joined together so that you can navigate from one type of object to the next in a way that makes sense for the data Consider the example of employees and company departments In Listing 1421, we join each employee to his or her department and then list each employee with his or her corresponding department Since each employee belongs to only one (and exactly one) department, the total number of items