asp.net core qr code reader

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Figure 23-1. The #if and #else constructs For example, the following code illustrates a simple #if...#else construct. If the symbol RightHanded is defined, the code between the #if and the #else will be compiled. Otherwise, the code between the #else and the #endif will be compiled. ... #if RightHanded // Code implementing right-handed functionality ... #else // Code implementing left-handed functionality ... #endif

Figure 1-5. Windows Forms and previous frameworks are pixel-based, so when you change the system resolution through the Font Size setting, the sizes of the windows and UI elements change.

Figure 6-2. Possible WF implementation of above process Now let s consider some of the issues we may encounter when developing this application: The client wants to process visa applications as quickly as possible, so he wants to alert staff when an application is ready for the next stage. How will you provide this functionality in an efficient and timely manner when processing hundreds of thousands of application How will you pass data between different services and government departments, such as performing a police check on an applicant Some tasks take a long time to complete or require human intervention before they can proceed. How will you handle this waiting A typical visa will take weeks or months to process. How are you going to store the current state of a visa application

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Figure 23-2 illustrates the #if...#elif and #if...#elif...#else constructs. In the #if...#elif construct, if Cond1 evaluates to true, CodeSection1 is compiled, and compilation continues after the #endif. Otherwise, if Cond2 evaluates to true, CodeSection2 is compiled, and compilation continues after the #endif. This continues until either a condition evaluates to true or all the conditions have returned false. If that s the case, none of the code sections in the construct are compiled, and compilation continues after the #endif.

One of WPF s significant features is that it changes that situation: Instead of using the density of actual pixels to laying out the UI, WPF uses deviceindependent pixels, or dip. Each dip represents 1/96 of an inch regardless of how many actual pixels that length corresponds to. If the user changes the dpi from 96 to 120 instead of the size changing, WPF can use the greater density of pixels to render greater detail, as illustrated in Figure 16.

The #if...#elif...#else construct works the same way, except that if no condition is true, then the code section after the #else is then compiled, and compilation continues after the #endif.

What will happen to an application in the event of system failure How will you design your application so that it is flexible enough to accommodate future changes Imagine you need to debug and monitor different stages of the approval process; how will you do this

The following code demonstrates the #if...#elif...#else construct. The string containing the description of the version of the program is set to various values, depending on which compilation symbol is defined. #define DemoVersionWithoutTimeLimit ... const int intExpireLength = 30; string strVersionDesc = null; int intExpireCount = 0; #if DemoVersionWithTimeLimit intExpireCount = intExpireLength; strVersionDesc = "This version of Supergame Plus will expire in 30 days";

Figure 1-6. WPF takes into account the value that s set as the system dpi. When the dpi changes, WPF adjusts so that the rendered screens remain the same size.

Agggrahh! As you can see even a simple process can get very complex quickly. Of course you can develop such an application very successfully (and many have) using current technologies, but Windows Workflow has many inbuilt features to handle some of this complexity.

#elif DemoVersionWithoutTimeLimit strVersionDesc = "Demo Version of Supergame Plus"; #elif OEMVersion strVersionDesc = "Supergame Plus, distributed under license"; #else strVersionDesc = "The original Supergame Plus!!"; #endif Console.WriteLine( strVersionDesc ); ...

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