Chapter 10 Attributes
Summary:
This chapter discusses the properties and indexers in C #
First, attribute
Divided into static properties, instance properties, and virtual properties
l Avoid access directly to the type field or use the cumbersome access to access
l Good to implement the type of data package, such as changing the field and maintaining the properties of the property is transparent to the user.
l The amount of code is small, the operation is small, otherwise the method call is more appropriate.
Second, the indexer
l There are multiple overloaded indexers, as long as the parameter list is different.
l You can change the method name generated by the compiler as the indexer by applying System.Runtime.CompilerServices.IndexerNameAttribute (Default using GET_ITEM (...), set_item (...))
l Cannot define the same name and only the same name of the same reference only by the above change method name
l There is no so-called "static indexer"
Note: Adding parameters or values in the attribute or indexer is worth determining to help ensure the integrity of the program.
A simple example:
Using system;
Class IndexerTest
{
Private static string [] strarr = new string [5];
IndexerTest ()
{
For (int i = 0; i <5; i )
{
Strarr [I] = i.toString ();
}
}
Public String this [int32 nindex]
{
Get {
Return strarr [NINDEX];
}
SET {
strarr [NINDEX] = VALUE;
}
}
/ / Provide different parameter columns to perform overload indexer
Public String this [byte bindex]
{
Get {
Return strarr [bindex];
}
SET {
Strarr [Bindex] = (String) Value;
}
}
// read-only properties
Public string [] strarr
{
Get {
Return strarr;
}
}
Public static void
Main
()
{
INDEXERTEST IT = New IndexerTest ();
IT [1] = "Hello"; // Written by using the indexer
FOREACH (String Str in it.strarr)
{
Console.writeLine (STR);
}
}
}
/ *
operation result:
0
Hello
2
3
4
* /
