Of c # (11) enumeration (Enums)

1.11 enumeration (Enums)

Enumerates a set of attributes declared as the same constant names define a single category. It is commonly used in some of the known range at compile time constants. However, the specific values of these constants to be determined at execution time. For example, the known blue and green primary colors are red, they belong to the same color. Can be defined as follows:

backup / bin / bin_old / conf / data / eshow / log / maint / news: 10 / news: 11 / news: 12 / news: 13 / news: 14 / news: 15 / news: 16 / news: 17 / news: 18 / news: 2 / news: 3 / news: 4 / news: 5 / news: 6 / news: 7 / news: 8 / news: 9 / seeds / svn / tasks / tmp / xml2dict-read-only /
enum Color (
Red,
Blue,
Green
)
/ Bin / boot / dev / etc / home / lib / lost + found / media / misc / mnt / net / opt / proc / root / sbin / selinux / srv / sys / tmp / u01 / usr / var / vmware

We create a shape (form) class, every body will have color. Colors are "shape" of the property. However, the implementation of the specific color must be decision time:

backup / bin / bin_old / conf / data / eshow / log / maint / news: 10 / news: 11 / news: 12 / news: 13 / news: 14 / news: 15 / news: 16 / news: 17 / news: 18 / news: 2 / news: 3 / news: 4 / news: 5 / news: 6 / news: 7 / news: 8 / news: 9 / seeds / svn / tasks / tmp / xml2dict-read-only /
class Shape
(
public void Fill (Color color) (
switch (color) (
case Color.Red:
...
break;
case Color.Blue:
...
break;
case Color.Green:
...
break;
default:
break;
)
)
)
/ Bin / boot / dev / etc / home / lib / lost + found / media / misc / mnt / net / opt / proc / root / sbin / selinux / srv / sys / tmp / u01 / usr / var / vmware

The File method to illustrate how a kind of a given color to give shape class. Enumeration better than ordinary integer constant lies: it makes the code easier to read to understand and more secure. Enumeration constants can be decided by the compiler. Use the compiler can also check its validity. C # enumeration is not unique. Hey, I do not woven detail. Took the opportunity to shoot! If anyone interested - his reading! (To avoid eating too many bananas would introduce the book "c language programming FAQ" Tsinghua 1996. 29.00 yuan. Although ancient, I can see in the bookstore)






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Semi-distributed structure of the advantages of performance, scalability can be better, easier management, but the Super-dependent on, easy to be attacked, fault tolerance has also been Yingxiang. The following table compares the four kinds of structural combination of properties, compare the results shown in Table 1-1.

Comparison of standard / center topology topology topology fully distributed unstructured distributed architecture of the whole semi-distributed topology topology
Poor poor good scalability in
Good Good in poor reliability
Maintainability of the best of the best good
Found high in the most efficient algorithm
Support Support does not support complex queries support

Table 1:4 Performance Comparison of types of structure








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