how do I make brackets [] take specific args (like the DataRow class)

[Chris LaJoie]

I'd like to impliment the same type of functionality the DataRow has as far
as how it uses brackets. I'll give you an example of what I'm looking for.

DataRow dr = dt.Rows[0];

string aTestVar = (string)dr[0];
....OR...
string aTestVar = (string)dr["aTestColumn"];

How would I impliment this in my own custom types? Thanks.

Chris LaJoie

 

[Chris Taylor]

Hi,

What you are refering to is called a indexer. In C# the syntax for an
indexer is like that of a property. The following is the indexer that takes
a int as the index and returns an object. Note that the indexer is named
this in C#. The type of the index and the return value can be what ever make
sense for your implemetation.

class MyData
{
public virtual object this[int index]
{
get {...}
set {...}
}
}

To use this

MyData d = new MyData()
string s = (string)d[2];

Hope this helps

Chris Taylor

 

[Jack Hanebach]

I'd like to impliment the same type of functionality the DataRow has as far
as how it uses brackets. I'll give you an example of what I'm looking for.

DataRow dr = dt.Rows[0];

string aTestVar = (string)dr[0];
...OR...
string aTestVar = (string)dr["aTestColumn"];

How would I impliment this in my own custom types? Thanks.

Use indexers:

public class MyClass
{
public string this[int index]
{
get { return // whatever you need to return based on index }
set { whatever = value; }
}
public string this[string match]
{
get { return // whatever you need to return based on match } // etc.
}
}