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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Signum.Utilities.Reflection;
using Signum.Entities.DynamicQuery;
using Signum.Entities;
using System.Linq.Expressions;
using System.Reflection;
namespace Signum.Engine.DynamicQuery
{
public class AutoDynamicQuery<T> : DynamicQuery<T>
{
public IQueryable<T> Query { get; private set; }
Dictionary<string, Meta> metas;
public AutoDynamicQuery(IQueryable<T> query)
{
if (query == null)
throw new ArgumentNullException("query");
this.Query = query;
metas = DynamicQuery.QueryMetadata(query);
InitializeColumns(mi => metas[mi.Name]);
}
public override ResultTable ExecuteQuery(QueryRequest request)
{
request.Columns.Insert(0, new _EntityColumn(EntityColumn().BuildColumnDescription()));
DQueryable<T> result = Query
.ToDQueryable(GetColumnDescriptions())
.SelectMany(request.Multiplications)
.Where(request.Filters)
.OrderBy(request.Orders)
.Select(request.Columns)
.TryTake(request.Limit);
DEnumerable<T> array = result.ToArray();
return array.ToResultTable(request.Columns);
}
public override int ExecuteQueryCount(QueryCountRequest request)
{
return Query.ToDQueryable(GetColumnDescriptions()).Where(request.Filters).Query.Count();
}
public override Lite ExecuteUniqueEntity(UniqueEntityRequest request)
{
var columns = new List<Column> { new _EntityColumn(EntityColumn().BuildColumnDescription()) };
DQueryable<T> orderQuery = Query
.ToDQueryable(GetColumnDescriptions())
.Where(request.Filters)
.OrderBy(request.Orders)
.Select(columns);
return (Lite)orderQuery.Query.Unique(request.UniqueType);
}
public override Expression Expression
{
get { return Query.Expression; }
}
}
}
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I'm Computer Scientist, one of the founders of Signum Software, and the lead developer behind Signum Framework.
www.signumframework.com
I love programming in C#, Linq, Compilers, Algorithms, Functional Programming, Computer Graphics, Maths...