Library is available via NuGet prackage https://www.nuget.org/packages/Linq.GridQuery.NetStandard
Description for primary (master) project:
Library is available via NuGet prackage https://www.nuget.org/packages/Linq.GridQuery
Inner workings of the library are explained in articles:
Linq.GridQuery
Library to wrap IQueryable with filter and sort queries received in serialized form (i.e. from JavaScript front-end). Works by way of expression trees.
- You create an instance of GridRequest based on the string descriptions of the query you have, as showcased below.
- You wrap your IQueryable (i.e. an Entity Framework query) with that GridRequest.
- Your query is now filtered, sorted, and paged. As you would expect from an IQueryable, this is all done with strong-typed expression trees, and will be handled by your query provider, as if you wrote the tress yorself (normally, that means, no in-memory processing).
// provide a deserialization function usable with your particular serialization scenario
// (you can also pass one to individual FilterTreeNodes if your app has multiple scenarios)
Config.DefaultValueDeserialiationFunction = (val, type) =>
{
return JsonConvert.DeserializeObject(val, type);
};
//filter object equivalent to
//.Where(item => item.A > 3
// && (item.E.HasValue == false
// || (new[] { TestEnum.A, TestEnum.B }).Contains(item.E.Value)))
var filter =
new FilterTreeNode(
new GridFilter("A","gt","3"),
LogicalOpertor.AND,
new FilterTreeNode(
new GridFilter("E", "isnull", "null"),
LogicalOpertor.OR,
new GridFilter("E", "in", "[1,2]")));
//sort object equvalent to
//.OrderBy(item => item.C.HasValue) //nulls first
//.ThenBy(item => item.C)
//.ThenByDescending(item => item.E)
var sort = new[]
{
new GridSort("C", isDescending: false, treatNullLowest: true),
new GridSort("E", isDescending: true)
};
var gridQuery = new GridRequest()
{
Filter = filter,
Sort = sort,
Skip = 1,
Take = 5
};
var Collection = (new[]
{
new TestSubject { A = 0 , C = null , E = null },
new TestSubject { A = 1 , C = null , E = null },
new TestSubject { A = 2 , C = 3 , E = TestEnum.B },
new TestSubject { A = 3 , C = 5 , E = TestEnum.C },
new TestSubject { A = 4 , C = null , E = TestEnum.B },
new TestSubject { A = 5 , C = 3 , E = null },
new TestSubject { A = 6 , C = 3 , E = TestEnum.C },
new TestSubject { A = 7 , C = 3 , E = TestEnum.A },
new TestSubject { A = 8 , C = null , E = null },
new TestSubject { A = 9 , C = 3 , E = TestEnum.B },
new TestSubject { A = 10 , C = 3 , E = TestEnum.C },
new TestSubject { A = 11 , C = null , E = null },
new TestSubject { A = 12 , C = 3 , E = TestEnum.B },
new TestSubject { A = 13 , C = 3 , E = TestEnum.C }
})
.AsQueryable();
var query = gridQuery.WrapQuery(Collection);
var result = query.ToArray(); // 5 items in result
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