print barcode labels vb.net The Customer Class in Visual C#

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The Customer Class
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Any time you are working with data, you ll have a class to hold that data Since this application works with customers, the natural approach is to have a Customer class, as follows: C#:
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public class Customer { public string FirstName { get; set; } public string LastName { get; set; } }
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Public Class Customer Property FirstName As String Property LastName As String End Class
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This is the minimal information required for this demo, and any class that you build will have more properties Notice that both properties are type string
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The CustomerRepository Class
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In this program, we create a class that is solely responsible for working with data This is a common pattern, which is called the Repository pattern The following CustomerRepository class has a method that returns a list of Customer objects: C#:
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using SystemCollectionsGeneric; public class CustomerRepository { public List<Customer> GetCustomers() { var customers = new List<Customer> { new Customer { FirstName = "Franz", LastName = "Smith" }, new Customer { FirstName = "Jean " }, new Customer { FirstName = "Wim", LastName = "Meister" } }; return customers; } }
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Public Class CustomerRepository Public Function GetCustomers() As List(Of Customer) Dim customers As New List(Of Customer) From { New Customer With { FirstName = "Franz", LastName = "Smith" }, New Customer With
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6: Debugging with Visual Studio
{ FirstName = "Jean " }, New Customer With { FirstName = "Wim", LastName = "Meister" } } Return customers End Function End Class
The GetCustomers method returns a List<Customer> (List(Of Customer) in VB) For the purposes of this discussion, how the GetCustomers method works won t matter Such a method could easily get customers from a database, Web service, or other object For simplicity, GetCustomers initializes a List with Customer objects The part of this method that is particularly important is the customer whose FirstName property is set to Jean Notice the blank space appended to the name, which is required to make this scenario behave as designed (ie, to intentionally create a bug) It s also conspicuous that the Customer object with a FirstName property set to Jean also does not have a LastName
The Program with Bugs
The following is a search program that uses CustomerRepository to get a list of Customer objects The logic will iterate through the results, checking to see if the result is equal to the search term When the result is equal, the program prints the full name of the customer If no matching customers are found, the program indicates that the customer wasn t found: C#:
using System; class Program { static void Main() { var custRep = new CustomerRepository(); var customers = custRepGetCustomers(); var searchName = "Jean"; bool customerFound = false;
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foreach (var cust in customers) { // 1 First Bug if (searchName == custFirstName) { ConsoleWriteLine( "Found: {0} {1}", custFirstName, custLastName); customerFound = true; } } if (!customerFound) { ConsoleWriteLine("Didn't find customer"); } ConsoleReadKey(); } }
Module Module1 Sub Main() Dim custRep As New CustomerRepository Dim customers As List(Of Customer) customers = custRepGetCustomers() Dim searchName As String = "Jean" Dim customerFound As Boolean = False For Each cust As Customer In customers ' 1 First Bug If (searchName = custFirstName) Then ConsoleWriteLine( "Found: {0} {1}", custFirstName, custLastName) customerFound = True End If Next
6: Debugging with Visual Studio
If (customerFound = False) Then ConsoleWriteLine("Didn't find customer") End If ConsoleReadKey() End Sub End Module
Notice that the searchName variable is set to Jean Within the loop, the searchName is compared with the FirstName property of each Customer instance for equality Here s the output from when the program runs:
Didn't find customer
What is supposed to happen is that the program should find the matching record and print it out, but that s not what happens Here is the first bug, and the following discussion describes how to find the cause of the bug using the VS debugger
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