How-to Compare 2 arraylists

[Gaby]

Hi all,

What is the best way to compare 2 (large) ArrayLists filled with an object.
Can you please help me?

Gaby

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

What you mean with "filled with an object" ?

If the array is of a user defined type I th ink that first it depend of how
you want it to compare them, you could compare if both arrays have the same
references, if so all you have to do is a foreach.

If you want to compare the objects itself it depend of the class.

Also remember to check for the size to be equal.
cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Gaby" <Ga**@discussions.microsoft.com> wrote in message
news:34**********************************@microsof t.com...

Hi all,

What is the best way to compare 2 (large) ArrayLists filled with an
object.
Can you please help me?

Gaby

[Gaby]

Hi,

I need to compare 2 array lists with the same object type (cAddress).
public class cAddress
{
public string Address = "";
public string Number = "";
public string Zip = "";
public string City = "";
public string Country = "";
public string Telephone = "";
}

Every period the data from the database will be checked against the current
arraylist.
The lists will be filled with aprox 10000 objects.
No I want to know what the best and quickest way is.

Gaby

"Ignacio Machin ( .NET/ C# MVP )" wrote:

Hi,

What you mean with "filled with an object" ?

If the array is of a user defined type I th ink that first it depend of how
you want it to compare them, you could compare if both arrays have the same
references, if so all you have to do is a foreach.

If you want to compare the objects itself it depend of the class.

Also remember to check for the size to be equal.
cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Gaby" <Ga**@discussions.microsoft.com> wrote in message
news:34**********************************@microsof t.com...

Hi all,

What is the best way to compare 2 (large) ArrayLists filled with an
object.
Can you please help me?

Gaby

[James Curran]

First step, make cAddress objects comparable. Basically, this means to
implement the IComparable interface (that is, define a CompareTo method for
it). You may also wnat to define an operator== for it.

Next, I'm going to assume that Current[i] corresponds to Database[i], in
which case it, it's just:

for(int i =0; i< Current.Length, ++i)
{
cAddress ad1 = Current[i];
cAddress ad2 = Database[i];
if (ad1.CompareTo(ad2) != 0)
return "Don't Match";
}
return "Match";

--
--
Truth,
James Curran
[erstwhile VC++ MVP]

Home: www.noveltheory.com Work: www.njtheater.com
Blog: www.honestillusion.com Day Job: www.partsearch.com

"Gaby" <Ga**@discussions.microsoft.com> wrote in message
news:BA**********************************@microsof t.com...

Hi,

I need to compare 2 array lists with the same object type (cAddress).
public class cAddress
{
public string Address = "";
public string Number = "";
public string Zip = "";
public string City = "";
public string Country = "";
public string Telephone = "";
}

Every period the data from the database will be checked against the current arraylist.
The lists will be filled with aprox 10000 objects.
No I want to know what the best and quickest way is.

Gaby

"Ignacio Machin ( .NET/ C# MVP )" wrote:

Hi,

What you mean with "filled with an object" ?

If the array is of a user defined type I th ink that first it depend of how you want it to compare them, you could compare if both arrays have the same references, if so all you have to do is a foreach.

If you want to compare the objects itself it depend of the class.

Also remember to check for the size to be equal.
cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Gaby" <Ga**@discussions.microsoft.com> wrote in message
news:34**********************************@microsof t.com...

Hi all,

What is the best way to compare 2 (large) ArrayLists filled with an
object.
Can you please help me?

Gaby

[Gaby]

cheers....

"James Curran" wrote:

First step, make cAddress objects comparable. Basically, this means to
implement the IComparable interface (that is, define a CompareTo method for
it). You may also wnat to define an operator== for it.

Next, I'm going to assume that Current[i] corresponds to Database[i], in
which case it, it's just:

for(int i =0; i< Current.Length, ++i)
{
cAddress ad1 = Current[i];
cAddress ad2 = Database[i];
if (ad1.CompareTo(ad2) != 0)
return "Don't Match";
}
return "Match";

--
--
Truth,
James Curran
[erstwhile VC++ MVP]

Home: www.noveltheory.com Work: www.njtheater.com
Blog: www.honestillusion.com Day Job: www.partsearch.com

"Gaby" <Ga**@discussions.microsoft.com> wrote in message
news:BA**********************************@microsof t.com...

Hi,

I need to compare 2 array lists with the same object type (cAddress).
public class cAddress
{
public string Address = "";
public string Number = "";
public string Zip = "";
public string City = "";
public string Country = "";
public string Telephone = "";
}

Every period the data from the database will be checked against the

current

arraylist.
The lists will be filled with aprox 10000 objects.
No I want to know what the best and quickest way is.

Gaby

"Ignacio Machin ( .NET/ C# MVP )" wrote:

Hi,

What you mean with "filled with an object" ?

If the array is of a user defined type I th ink that first it depend of how you want it to compare them, you could compare if both arrays have the same references, if so all you have to do is a foreach.

If you want to compare the objects itself it depend of the class.

Also remember to check for the size to be equal.
cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Gaby" <Ga**@discussions.microsoft.com> wrote in message
news:34**********************************@microsof t.com...
> Hi all,
>
> What is the best way to compare 2 (large) ArrayLists filled with an
> object.
> Can you please help me?
>
> Gaby