Indexing with an String Index : Indexer « Class Interface « C# / C Sharp
Indexing with an String Index
/*
A Programmer's Introduction to C# (Second Edition)
by Eric Gunnerson
Publisher: Apress L.P.
ISBN: 1-893115-62-3
*/
// 19 - Indexers and Enumerators\Indexing with an String Index
// copyright 2000 Eric Gunnerson
using System;
using System.Collections;
class DataValue
{
public DataValue(string name, object data)
{
this.name = name;
this.data = data;
}
public string Name
{
get
{
return(name);
}
set
{
name = value;
}
}
public object Data
{
get
{
return(data);
}
set
{
data = value;
}
}
string name;
object data;
}
class DataRow
{
public DataRow()
{
row = new ArrayList();
}
public void Load()
{
/* load code here */
row.Add(new DataValue("Id", 5551212));
row.Add(new DataValue("Name", "Fred"));
row.Add(new DataValue("Salary", 2355.23m));
}
public DataValue this[int column]
{
get
{
return( (DataValue) row[column - 1]);
}
set
{
row[column - 1] = value;
}
}
int FindColumn(string name)
{
for (int index = 0; index < row.Count; index++)
{
DataValue dataValue = (DataValue) row[index];
if (dataValue.Name == name)
return(index);
}
return(-1);
}
public DataValue this[string name]
{
get
{
return( (DataValue) this[FindColumn(name)]);
}
set
{
this[FindColumn(name)] = value;
}
}
ArrayList row;
}
public class IndexingwithanStringIndex
{
public static void Main()
{
DataRow row = new DataRow();
row.Load();
DataValue val = row["Id"];
Console.WriteLine("Id: {0}", val.Data);
Console.WriteLine("Salary: {0}", row["Salary"].Data);
row["Name"].Data = "Barney"; // set the name
Console.WriteLine("Name: {0}", row["Name"].Data);
}
}
