aspnet examples question

  • Thread starter Thread starter rodchar
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rodchar

hey all,

the following code snippet was in a tutorial at asp.net regarding DataList
examples and this was used as the datasource:

ICollection CreateDataSource() {
DataTable dt = new DataTable();
DataRow dr;

dt.Columns.Add(new DataColumn("StringValue", typeof(string)));

for (int i = 0; i < 10; i++) {
dr = dt.NewRow();
dr[0] = "Item " + i.ToString();
dt.Rows.Add(dr);
}

DataView dv = new DataView(dt);
return dv;
}

my question why not make the return type a DataView instead of this
ICollection interface?

thanks,
rodchar
 
You need to get a book on basic OO principles.


Basically, somewhere DataView is an ICollection or the code would not work.

By returning the interface, you're protecting yourself in the future,
because you could completely swap out the implementation of
CreateDataSource() with another (or any) object that implements the
ICollection interface.

Thus you future proof yourself.

That's 1 cent explanation for the OO concept....in about $1,000 worth of
information.
 
Perfect.
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sloan said:
You need to get a book on basic OO principles.


Basically, somewhere DataView is an ICollection or the code would not work.

By returning the interface, you're protecting yourself in the future,
because you could completely swap out the implementation of
CreateDataSource() with another (or any) object that implements the
ICollection interface.

Thus you future proof yourself.

That's 1 cent explanation for the OO concept....in about $1,000 worth of
information.





rodchar said:
hey all,

the following code snippet was in a tutorial at asp.net regarding DataList
examples and this was used as the datasource:

ICollection CreateDataSource() {
DataTable dt = new DataTable();
DataRow dr;

dt.Columns.Add(new DataColumn("StringValue", typeof(string)));

for (int i = 0; i < 10; i++) {
dr = dt.NewRow();
dr[0] = "Item " + i.ToString();
dt.Rows.Add(dr);
}

DataView dv = new DataView(dt);
return dv;
}

my question why not make the return type a DataView instead of this
ICollection interface?

thanks,
rodchar
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