Filter Collection by Multiple Criteria
Clash Royale CLAN TAG#URR8PPP
I want to the user to filter a list of receipts by various criteria. Just the regular, an empty filter should show all items, an entry in customer should show all receipts from that customer and an additional entry in date should show all entries from said customer on the given date. I have the feeling, my if else apprach is not the best way, since with 4 criteria I'm already at 16 branches, not speak of 5, 6, or 7 criteria.
What is the most elegant way to achieve this.
Model:
class customer
public int ID get; set;
public string Name get; set;
class receipt
public int ID get; set;
public string Number get; set;
public DateTime Date get; set;
public double Amount get; set;
public customer Customer get; set;
Viewmodel
class receiptViewModel
{
ObservableCollection<receipt> ReceiptList get; set;
List<receipt> ReceiptListView get; set;
private string filter;
public string Filter
get return filter;
set
filter = value;
if (number != null && date == null && customer && null)
ReceiptListView = ReceiptList.Where(x => x.Number.Contains(number)).ToList();
else if (number != null && date != null && customer && null)
ReceiptListView = ReceiptList.Where(x => x.Number.Contains(number) && x.Date === date).ToList();
//aso aso aso
c# mvvm
asked Dec 25 '18 at 15:20
Mister 832
1905
add a comment |
I want to the user to filter a list of receipts by various criteria. Just the regular, an empty filter should show all items, an entry in customer should show all receipts from that customer and an additional entry in date should show all entries from said customer on the given date. I have the feeling, my if else apprach is not the best way, since with 4 criteria I'm already at 16 branches, not speak of 5, 6, or 7 criteria.
What is the most elegant way to achieve this.
Model:
class customer
public int ID get; set;
public string Name get; set;
class receipt
public int ID get; set;
public string Number get; set;
public DateTime Date get; set;
public double Amount get; set;
public customer Customer get; set;
Viewmodel
class receiptViewModel
{
ObservableCollection<receipt> ReceiptList get; set;
List<receipt> ReceiptListView get; set;
private string filter;
public string Filter
get return filter;
set
filter = value;
if (number != null && date == null && customer && null)
ReceiptListView = ReceiptList.Where(x => x.Number.Contains(number)).ToList();
else if (number != null && date != null && customer && null)
ReceiptListView = ReceiptList.Where(x => x.Number.Contains(number) && x.Date === date).ToList();
//aso aso aso
c# mvvm
asked Dec 25 '18 at 15:20
Mister 832
1905
add a comment |
I want to the user to filter a list of receipts by various criteria. Just the regular, an empty filter should show all items, an entry in customer should show all receipts from that customer and an additional entry in date should show all entries from said customer on the given date. I have the feeling, my if else apprach is not the best way, since with 4 criteria I'm already at 16 branches, not speak of 5, 6, or 7 criteria.
What is the most elegant way to achieve this.
Model:
class customer
public int ID get; set;
public string Name get; set;
class receipt
public int ID get; set;
public string Number get; set;
public DateTime Date get; set;
public double Amount get; set;
public customer Customer get; set;
Viewmodel
class receiptViewModel
{
ObservableCollection<receipt> ReceiptList get; set;
List<receipt> ReceiptListView get; set;
private string filter;
public string Filter
get return filter;
set
filter = value;
if (number != null && date == null && customer && null)
ReceiptListView = ReceiptList.Where(x => x.Number.Contains(number)).ToList();
else if (number != null && date != null && customer && null)
ReceiptListView = ReceiptList.Where(x => x.Number.Contains(number) && x.Date === date).ToList();
//aso aso aso
c# mvvm
asked Dec 25 '18 at 15:20
Mister 832
1905
I want to the user to filter a list of receipts by various criteria. Just the regular, an empty filter should show all items, an entry in customer should show all receipts from that customer and an additional entry in date should show all entries from said customer on the given date. I have the feeling, my if else apprach is not the best way, since with 4 criteria I'm already at 16 branches, not speak of 5, 6, or 7 criteria.
What is the most elegant way to achieve this.
Model:
class customer
public int ID get; set;
public string Name get; set;
class receipt
public int ID get; set;
public string Number get; set;
public DateTime Date get; set;
public double Amount get; set;
public customer Customer get; set;
Viewmodel
class receiptViewModel
{
ObservableCollection<receipt> ReceiptList get; set;
List<receipt> ReceiptListView get; set;
private string filter;
public string Filter
get return filter;
set
filter = value;
if (number != null && date == null && customer && null)
ReceiptListView = ReceiptList.Where(x => x.Number.Contains(number)).ToList();
else if (number != null && date != null && customer && null)
ReceiptListView = ReceiptList.Where(x => x.Number.Contains(number) && x.Date === date).ToList();
//aso aso aso
c# mvvm
c# mvvm
asked Dec 25 '18 at 15:20
Mister 832
1905
asked Dec 25 '18 at 15:20
Mister 832
1905
asked Dec 25 '18 at 15:20
Mister 832
1905
asked Dec 25 '18 at 15:20
Mister 832
1905
asked Dec 25 '18 at 15:20
Mister 832
1905
1905
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
You can build the LINQ query in several steps by appending new where clauses
IEnumerable<receipt> query = ReceiptList;
if (customer != null)
query = query.Where(x => x.CustomerId == customer.ID);
if (number != null)
query = query.Where(x => x.Number.Contains(number));
if (date != null)
query = query.Where(x => x.Date == date);
...
ReceiptListView = query.ToList();
This reduces the complexity from O(2ⁿ) to O(n)
answered Dec 25 '18 at 15:29
Olivier Jacot-Descombes
2,5981117
2
It's probably also worth to look into linqkit's predicatebuilder if more complex predicates have to be put together (say instead of combining all the limitations, wanting "or").
– Voo
Dec 26 '18 at 0:00
Very nice, thank you!
– Mister 832
Dec 26 '18 at 8:41
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can build the LINQ query in several steps by appending new where clauses
IEnumerable<receipt> query = ReceiptList;
if (customer != null)
query = query.Where(x => x.CustomerId == customer.ID);
if (number != null)
query = query.Where(x => x.Number.Contains(number));
if (date != null)
query = query.Where(x => x.Date == date);
...
ReceiptListView = query.ToList();
This reduces the complexity from O(2ⁿ) to O(n)
answered Dec 25 '18 at 15:29
Olivier Jacot-Descombes
2,5981117
2
It's probably also worth to look into linqkit's predicatebuilder if more complex predicates have to be put together (say instead of combining all the limitations, wanting "or").
– Voo
Dec 26 '18 at 0:00
Very nice, thank you!
– Mister 832
Dec 26 '18 at 8:41
add a comment |
You can build the LINQ query in several steps by appending new where clauses
IEnumerable<receipt> query = ReceiptList;
if (customer != null)
query = query.Where(x => x.CustomerId == customer.ID);
if (number != null)
query = query.Where(x => x.Number.Contains(number));
if (date != null)
query = query.Where(x => x.Date == date);
...
ReceiptListView = query.ToList();
This reduces the complexity from O(2ⁿ) to O(n)
answered Dec 25 '18 at 15:29
Olivier Jacot-Descombes
2,5981117
2
It's probably also worth to look into linqkit's predicatebuilder if more complex predicates have to be put together (say instead of combining all the limitations, wanting "or").
– Voo
Dec 26 '18 at 0:00
Very nice, thank you!
– Mister 832
Dec 26 '18 at 8:41
add a comment |
You can build the LINQ query in several steps by appending new where clauses
IEnumerable<receipt> query = ReceiptList;
if (customer != null)
query = query.Where(x => x.CustomerId == customer.ID);
if (number != null)
query = query.Where(x => x.Number.Contains(number));
if (date != null)
query = query.Where(x => x.Date == date);
...
ReceiptListView = query.ToList();
This reduces the complexity from O(2ⁿ) to O(n)
answered Dec 25 '18 at 15:29
Olivier Jacot-Descombes
2,5981117
You can build the LINQ query in several steps by appending new where clauses
IEnumerable<receipt> query = ReceiptList;
if (customer != null)
query = query.Where(x => x.CustomerId == customer.ID);
if (number != null)
query = query.Where(x => x.Number.Contains(number));
if (date != null)
query = query.Where(x => x.Date == date);
...
ReceiptListView = query.ToList();
This reduces the complexity from O(2ⁿ) to O(n)
answered Dec 25 '18 at 15:29
Olivier Jacot-Descombes
2,5981117
edited Dec 25 '18 at 18:39
answered Dec 25 '18 at 15:29
Olivier Jacot-Descombes
2,5981117
answered Dec 25 '18 at 15:29
Olivier Jacot-Descombes
2,5981117
answered Dec 25 '18 at 15:29
Olivier Jacot-Descombes
2,5981117
2,5981117
2
It's probably also worth to look into linqkit's predicatebuilder if more complex predicates have to be put together (say instead of combining all the limitations, wanting "or").
– Voo
Dec 26 '18 at 0:00
Very nice, thank you!
– Mister 832
Dec 26 '18 at 8:41
add a comment |
2
It's probably also worth to look into linqkit's predicatebuilder if more complex predicates have to be put together (say instead of combining all the limitations, wanting "or").
– Voo
Dec 26 '18 at 0:00
Very nice, thank you!
– Mister 832
Dec 26 '18 at 8:41
2
2
It's probably also worth to look into linqkit's predicatebuilder if more complex predicates have to be put together (say instead of combining all the limitations, wanting "or").
– Voo
Dec 26 '18 at 0:00
It's probably also worth to look into linqkit's predicatebuilder if more complex predicates have to be put together (say instead of combining all the limitations, wanting "or").
– Voo
Dec 26 '18 at 0:00
Very nice, thank you!
– Mister 832
Dec 26 '18 at 8:41
Very nice, thank you!
– Mister 832
Dec 26 '18 at 8:41
add a comment |
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