i like to confess that i am weak in LINQ. i have list with data. i want to search list fist by given value and then sort data by max occurance means which comes maximum time in rows.
List<SearchResult> list = new List<SearchResult>() {
new SearchResult(){ID=1,Title="Cat"},
new SearchResult(){ID=2,Title="dog"},
new SearchResult(){ID=3,Title="Tiger"},
new SearchResult(){ID=4,Title="Cat"},
new SearchResult(){ID=5,Title="cat"},
new SearchResult(){ID=6,Title="dog"},
};
if i search & sort list with data like "dog cat" then output will be like
ID=1,Title=Cat
ID=4,Title=Cat
ID=5,Title=Cat
ID=2,Title=dog
ID=6,Title=dog
all cat will come first because this cat keyword found maximum time in all the rows and then dog found maximum time.
this below data will not come because it is not in search term
ID=3,Title=Tiger
looking for solution. thanks
List<SearchResult> list = new List<SearchResult>() {
new SearchResult(){ID=1,Title="Geo Prism 1995 - ABS #16213899"},
new SearchResult(){ID=2,Title="Excavator JCB - ECU P/N: 728/35700"},
new SearchResult(){ID=3,Title="Geo Prism 1995 - ABS #16213899"},
new SearchResult(){ID=4,Title="JCB Excavator - ECU P/N: 728/35700"},
new SearchResult(){ID=5,Title="Geo Prism 1995 - ABS #16213899"},
new SearchResult(){ID=6,Title="dog"},
};
var to_search = new[] { "Geo", "JCB" };
var result = list.Where(sr => to_search.Any(ts => String.Compare(ts, sr.Title, StringComparison.OrdinalIgnoreCase) == 0))
.GroupBy(sr => sr.Title.ToLower())
.OrderByDescending(g => g.Count());
var matched = result.SelectMany(m => m);
var completeList = matched.Concat(list.Except(matched));
dataGridView2.DataSource = completeList.ToList();
i try to your logic in another apps but it is not working. according to logic three rows first come with GEO keyword and then next 2 rows comes with JCB and then unmatched rest comes. what i need to change in ur code. please help. thanks
This will filter your list and group it by Title
, sorting the groups by their size.
List<SearchResult> list = new List<SearchResult>() {
new SearchResult(){ID=1,Title="Cat"},
new SearchResult(){ID=2,Title="dog"},
new SearchResult(){ID=3,Title="Tiger"},
new SearchResult(){ID=4,Title="Cat"},
new SearchResult(){ID=5,Title="cat"},
new SearchResult(){ID=6,Title="dog"},
};
var to_search = new[] { "cat", "dog" };
var result = list.Where(sr => to_search.Any(ts => String.Compare(ts, sr.Title, StringComparison.OrdinalIgnoreCase) == 0))
.GroupBy(sr => sr.Title.ToLower())
.OrderByDescending(g => g.Count());
foreach (var group in result)
foreach (var element in group)
Debug.WriteLine(String.Format("ID={0},Title={1}", element.ID, element.Title));
Output:
ID=1,Title=Cat
ID=4,Title=Cat
ID=5,Title=cat
ID=2,Title=dog
ID=6,Title=dog
If you don't care about the actual grouping, just can flatten the list of groups with SelectMany .
(Note that this code will ignore the case of Title
. I don't know if this is what you want or if it is a typo in code: you are using cat
and Cat
, and in your output it is only Cat
, but dog
is not capitalized.)
Edit:
To get the unmatched items, you can use Except :
var unmatched = list.Except(result.SelectMany(m => m)); // beware! contains the tiger!
Edit 2:
var result = list.Where(sr => to_search.Any(ts => String.Compare(ts, sr.Title, StringComparison.OrdinalIgnoreCase) == 0))
.GroupBy(sr => sr.Title.ToLower())
.OrderByDescending(g => g.Count());
var matched = result.SelectMany(m => m);
var completeList = matched.Concat(list.Except(matched));
foreach (var element in completeList)
Debug.WriteLine(String.Format("ID={0},Title={1}", element.ID, element.Title));
Output
ID=1,Title=Cat
ID=4,Title=Cat
ID=5,Title=cat
ID=2,Title=dog
ID=6,Title=dog
ID=3,Title=Tiger
Edit 3
var result = from searchResult in list
let key_string = to_search.FirstOrDefault(ts => searchResult.Title.ToLower().Contains(ts.ToLower()))
group searchResult by key_string into Group
orderby Group.Count() descending
select Group;
I think the following should do the trick.
var searchText = "cat dog";
var searchResult = list
.Select(i => new {
Item = i,
Count = list.Count(x => string.Compare(x.Title, i.Title, true) == 0) // Add counter
})
.Where(i => searchText.Contains(i.Item.Title))
.OrderByDescending(i => i.Count)
.ThenBy(i => i.Item.ID)
.ToList()
Update
If you want unmatched data at the end, you need to add another sorting property in the anonymous object.
var searchText = "cat dog";
var searchResult = list
.Select(i => new {
Item = i,
Matched = searchText.Contains(i.Item.Title.ToUpper()),
Count = list.Count(x => string.Compare(x.Title, i.Title, true) == 0) // Add counter
})
.OrderByDescending(i => i.Matched)
.ThenBy(i => i.Count)
.ThenBy(i => i.Item.ID)
.ToList()
IEnumerable<string> pets = new[] { "Cat", "dog", "Tiger", "Cat", "cat", "dog" };
var test = pets
.Where(p=>p.ToUpperInvariant() == "CAT" || p.ToUpperInvariant() == "DOG")
.GroupBy(p => p.ToUpperInvariant())
.OrderByDescending(g => g.Count())
.SelectMany(p => p);
foreach (string pet in test)
Console.WriteLine(pet);
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