qr code generator c# example The C# Language in C#

Generator QR Code in C# The C# Language

The C# Language
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Enumerations
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An enumeration is a set of named integer constants The keyword enum declares an enumerated type The general form for an enumeration is enum name { enumeration list }; Here, the type name of the enumeration is specified by name The enumeration list is a comma-separated list of identifiers Here is an example It defines an enumeration called Apple that enumerates various types of apples:
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enum Apple { Jonathan, GoldenDel, RedDel, Winesap, Cortland, McIntosh };
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A key point to understand about an enumeration is that each of the symbols stands for an integer value However, no implicit conversions are defined between an enum type and the built-in integer types, so an explicit cast must be used Also, a cast is required when converting between two enumeration types Since enumerations represent integer values, you can use an enumeration to control a switch statement or as the control variable in a for loop, for example Each enumeration symbol is given a value one greater than the symbol that precedes it By default, the value of the first enumeration symbol is 0 Therefore, in the Apple enumeration, Jonathan is 0, GoldenDel is 1, RedDel is 2, and so on The members of an enumeration are accessed through their type name via the dot operator For example
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ConsoleWriteLine(AppleRedDel + " has the value " + (int)AppleRedDel);
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RedDel has the value 2
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As the output shows, when an enumerated value is displayed, its name is used To obtain its integer value, a cast to int must be employed Here is a program that illustrates the Apple enumeration:
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// Demonstrate an enumeration using System; class EnumDemo { enum Apple { Jonathan, GoldenDel, RedDel, Winesap, Cortland, McIntosh }; static void Main() { string[] color = { "Red", "Yellow",
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12:
Interfaces, Structures, and Enumerations
"Red", "Red", "Red", "Reddish Green" }; Apple i; // declare an enum variable // Use i to cycle through the enum for(i = AppleJonathan; i <= AppleMcIntosh; i++) ConsoleWriteLine(i + " has value of " + (int)i); ConsoleWriteLine(); // Use an enumeration to index an array for(i = AppleJonathan; i <= AppleMcIntosh; i++) ConsoleWriteLine("Color of " + i + " is " + color[(int)i]); } }
PART I PART I PART I
The output from the program is shown here:
Jonathan has value of 0 GoldenDel has value of 1 RedDel has value of 2 Winesap has value of 3 Cortland has value of 4 McIntosh has value of 5 Color Color Color Color Color Color of of of of of of Jonathan is Red GoldenDel is Yellow RedDel is Red Winesap is Red Cortland is Red McIntosh is Reddish Green
Notice how the for loops are controlled by a variable of type Apple Because the enumerated values in Apple start at zero, these values can be used to index color to obtain the color of the apple Notice that a cast is required when the enumeration value is used to index the color array As mentioned, there are no implicit conversions defined between integers and enumeration types An explicit cast is required
Initialize an Enumeration
You can specify the value of one or more of the symbols by using an initializer Do this by following the symbol with an equal sign and an integer value Symbols that appear after initializers are assigned values greater than the previous initialization value For example, the following code assigns the value of 10 to RedDel:
enum Apple { Jonathan, GoldenDel, RedDel = 10, Winesap, Cortland, McIntosh };
Part I:
The C# Language
Now the values of these symbols are
Jonathan GoldenDel RedDel Winesap Cortland McIntosh 0 1 10 11 12 13
Specify the Underlying Type of an Enumeration
By default, enumerations are based on type int, but you can create an enumeration of any integral type, except for type char To specify a type other than int, put the desired type after the enumeration name, separated by a colon For example, this statement makes Apple an enumeration based on byte:
enum Apple : byte { Jonathan, GoldenDel, RedDel, Winesap, Cortland, McIntosh };
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