C# 属性和索引

//用索引取一个记录中的各项

using system;

class IndexerRecord{

private string[] data= new string [6];

private string[] keys = {

"Author", "Publisher", "Title"，

"Subject", "ISBN", "Comments"

};

//程序中用了两种方法索引，一是整数作下标，一是关键字（字符串）作下标

public string this [int idx]{

set

{

if( idx>=0 && idx<data.length )

data[idx]=value;

}

get

{

if(idx>=0 && idx <data.length)

return data[idx];

return NULL;

}

}

public string this[string key]

{

set

{

ind idx = FindKey(key);

this[idx] = value;

}

get

{

return this[FindKey(key)];

}

}

private int FindKey(string key)

{

for(int i=0;i<keys.length;i++)

if(keys[i] == key)return i;

return -1;

}

static void Main()

{

IndexRecord record = new IndexRecord();

record[0] = "马克 吐温";

record[1] = "Crox出版公司";

record[2] = "汤姆 索亚历险记";

Console.WriteLine(record["Title"]);

Console.WriteLine( record[ "Author" ] );

Console.WriteLine( record[ "Publisher" ] );

}

}

//属性

class Person

{

public string Name{set;get;}

}