how to generate qr code in asp.net using c# Properties Under the Hood in C#

Generation QR-Code in C# Properties Under the Hood

Properties Under the Hood
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We re going to dive into the guts of the thing here, so feel free to skip this if you re not deeply interested in how this works under the covers. If you do look under the hood at the IL code emitted by the compiler, using a tool such as ildasm, you can see that properties consist of two pieces: the property metadata, and (either or both of) two functions called get_PropName and set_PropName, which actually implement the getter/setter. If you ve chosen to use the simple property syntax, there s also a field created with a name that is something like <PropName>k__BackingField. At the IL level, there s no difference between a property override and a new property declaration. It is the metadata on the getter and setter functions that determines whether they are virtual (and indeed what their accessibility might be). So the fact that we can t override a property that has a getter in the base class with one that has a getter and a setter in the derived class is a feature of the C# language, not the underlying platform.
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Well, we could work around that with another member to set the name; but as you can see in Example 4-18, it is all getting a bit ugly.
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abstract class FirefighterBase : NamedPerson { public abstract void ExtinguishFire(); public override string Name { get { return RealName;
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}
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public string RealName { get; set; } } // ...
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Not only is it ugly, but we have to replace all our object initializers to refer to our new RealName property, so it is making us do unnecessary work, which is never good:
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Firefighter joe = new Firefighter { RealName = "Joe" };
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Are you feeling uncomfortable with this approach yet Let s push on with it just a little bit further, and see what happens if we want to support a second behavior. Say we had a SalariedPerson abstract base that provides us with the contract for getting/setting a person s salary. We re going to need to apply that to both the FirefighterBase and the Administrator, to tie in with the billing system:
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abstract class SalariedPerson { public abstract decimal Salary { get; set; } }
We re providing a decimal property for the Salary that must be implemented by any SalariedPerson. So, what happens if we now try to derive from this class for our Administrator, as shown in Example 4-19
class Administrator : NamedPerson, SalariedPerson { private decimal salary; public override decimal Salary { get { return salary; } set { salary = value; } } // ... }
C++ developers will be familiar with this syntax for specifying multiple base classes.
Another compiler error:
Class 'Administrator' cannot have multiple base classes: 'NamedPerson' and 'SalariedPerson'
C# Does Not Support Multiple Inheritance of Implementation
This is a pretty fundamental roadblock! You cannot derive your class from more than one base class. When the designers of .NET were thinking about the platform fundamentals, they looked at this issue of multiple inheritance and how they d support it across multiple languages, including C#, VB, and C++. They decided that the C++ approach was too messy and prone to error (particularly when you think about how to resolve members that appear in both base classes with the same signature). The implications of multiple inheritance were probably just too difficult to come to grips with, and therefore were unlikely to bring net productivity gains. With that view prevailing, single inheritance of implementation is baked into the platform.
In more recent interviews, the .NET team has reflected that perhaps there might have been a way of allowing multiple inheritance of implementation, without introducing all the complexity of C++ multiple inheritance. That s the benefit of 20/20 hindsight; we (or our children) will just have to wait until the next platform generation and see how the argument goes then.
So are we really stymied No! While we can t support multiple inheritance of implementation, we can support multiple inheritance of interface.
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