c# qr code generator open source Part I Fundamentals in .net C#

Integration qr codes in .net C# Part I Fundamentals

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public sealed class ContractFailedEventArgs : EventArgs { public ContractFailedEventArgs(ContractFailureKind failureKind, String message, String condition, Exception originalException); public public public public ContractFailureKind String String Exception FailureKind Message Condition OriginalException { { { { get; get; get; get; } } } }
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cn=new SqlConnection("server=localhost;" + "Integrated Security=SSPI;Initial Catalog=Northwind"); cmd=new SqlCommand("spDeleteTerritory",cn); cmd.CommandType=CommandType.StoredProcedure;
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CREATE TABLE dbo.Sales ( empid VARCHAR(10) NOT NULL PRIMARY KEY, mgrid VARCHAR(10) NOT NULL, qty INT NOT NULL ); INSERT INTO dbo.Sales(empid, mgrid, qty) VALUES ('A', 'Z', 300), ('B', 'X', 100), ('C', 'X', 200), ('D', 'Y', 200), ('E', 'Z', 250), ('F', 'Z', 300), ('G', 'X', 100), ('H', 'Y', 150), ('I', 'X', 250), ('J', 'Z', 100), ('K', 'Y', 200); CREATE INDEX idx_qty_empid ON dbo.Sales(qty, empid); CREATE INDEX idx_mgrid_qty_empid ON dbo.Sales(mgrid, qty, empid);
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This is a grouped SELECT, because there is a MAX aggregate. Because it is a grouped SELECT, the use of the nonaggregated column c1 is illegal and the query is incorrect. An important role of the algebrizer is to identify any semantic errors in the statement. The following example shows that this is a nontrivial task for some queries with aggregates: SELECT c1, (SELECT T2.y FROM dbo.T2 WHERE T2.x = MAX(T1.c2)) FROM dbo.T1;
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Let s suppose you re writing a test case for a nominal salary; you need a nominal salary, and the way you get one is to type in whatever numbers your hands land on. I ll try it: 1239078382346 OK. That s a pretty high salary, a little over a trillion dollars, in fact, but if I trim it so that it s somewhat realistic, I get $90,783.82. Now, further suppose that this test case succeeds, that is, it finds an error. How do you know that it s found an error Well, presumably, you know what the answer is and what it should be because you calculated the correct answer by
Using out and ref with value types gives you the same behavior that you already get when passing reference types by value. With value types, out and ref allow a method to manipulate a single value type instance. The caller must allocate the memory for the instance, and the callee manipulates that memory. With reference types, the caller allocates memory for a pointer to a reference object and the callee manipulates this pointer. Because of this behavior, using out and ref with reference types is useful only when the method is going to "return" a reference to an object that it knows about. The following code demonstrates:
In some languages, such as unmanaged C++, it is possible to declare methods or parameters as a constant that forbids the code in an instance method from changing any of the object s fields or prevents the code from modifying any of the objects passed into the method . The CLR does not provide for this, and many programmers have been lamenting this missing feature . Since the CLR doesn t offer this feature, no language (including C#) can offer this feature . First, you should note that in unmanaged C++, marking an instance method or parameter as const ensured only that the programmer could not write normal code that would modify the object or parameter . Inside the method, it was always possible to write code that could mutate the object/parameter by either casting away the const-ness or by getting the address of the object/argument and then writing to the address . In a sense, unmanaged C++ lied to programmers, making them believe that their constant objects/arguments couldn t be written to even though they could . When designing a type s implementation, the developer can just avoid writing code that manipulates the object/arguments . For example, strings are immutable because the String class doesn t offer any methods that can change a string object . Also, it would be very difficult for Microsoft to endow the CLR with the ability to verify that a constant object/argument isn t being mutated . The CLR would have to verify at each write that the write was not occurring to a constant object, and this would hurt performance significantly . Of course, a detected violation would result in the CLR throwing an exception . Furthermore, constant support adds a lot of complexity for developers . For example, if a type is immutable, all derived types would have to respect this . In addition, an immutable type would probably have to consist of fields that are also of immutable types . These are just some of the reasons why the CLR does not support constant objects/arguments .
FIGURE 10-6 Build De nition: Workspace (multiple working folders)
FIguRE 1-6 Languages offer a subset of the CLR/CTS
CHAPTER 7 BUILDING OUT-OF-THE-BOX BUSINESS SOLUTIONS
Me.cn.Open() Me.da = New SqlDataAdapter( _ "Select * from Customer ORDER BY CompanyName", cn) ds = New DataSet("Customers") da.Fill(ds, "Customers") Me.DataGrid1.DataSource = _ ds.Tables("Customers").DefaultView bc = New BoundColumn() bc.DataField = "DateEntered" bc.HeaderText = "Date Entered" bc.ReadOnly = True bc.ItemStyle.HorizontalAlign = HorizontalAlign.Center bc.DataFormatString = "{0:d}" Me.DataGrid1.Columns.Add(bc) Me.DataGrid1.DataBind()
Figure 17-1 Recursion can be a valuable tool in the battle against complexity when used to attack suitable problems.
C05620245.fm Page 146 Tuesday, June 8, 2004 6:39 PM
It is important to maintain a loose coupling between the various components in your application to ensure that it remains flexible and easy to maintain. There are various ways to implement loose coupling. The most appropriate choice depends on the components involved and the required communication between them. In all cases, your goal should be to minimize static dependencies on specific implementations of components while allowing them to communicate efficiently. To determine how to achieve this goal, it is important for you to understand the differences between the various approaches so that you can best determine which one to use in your particular scenario. In some cases, you may have two components or classes that interact very closely with each other for example, a view and a view model and can achieve loose coupling and communication by using data binding, commands, interaction requests, and so on. In other cases, the components involved may be much more coarse-grained. For example, a common and effective approach to building large complex applications is to divide the functionality into discrete modules. It is desirable to minimize the use of static references between these modules so that the modules can be independently developed, tested, deployed, and updated. However, these modules will often be required to communicate in a loosely coupled fashion with other modules, and with the hosting application itself. The Prism Library supports the following loosely coupled communication approaches: Commanding. Use this when there is an expectation of immediate action from the user interaction. Region context. Use this to provide contextual information between the host and views in the host s region. This approach is somewhat similar to the DataContext, but it does not rely on it. Shared services. Callers can call a method on the service, which raises an event to the receiver of the message. Use this if none of the preceding is applicable. Event aggregation. Use this for communication across view models, presenters, or controllers when there is not a direct action-reaction expectation.
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