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simple grouping.

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This commit is contained in:
David Lebée
2018-03-08 21:59:18 -06:00
parent 17dcbb492f
commit 64d60b6942
5 changed files with 95 additions and 23 deletions
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PoweredSoft.DynamicLinq/Helpers/QueryableHelpers.cs
+37
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@@ -6,6 +6,7 @@ using System.Linq.Expressions;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Reflection.Emit;
namespace PoweredSoft.DynamicLinq.Helpers
{
@@ -76,6 +77,42 @@ namespace PoweredSoft.DynamicLinq.Helpers
return ret;
}
public static IQueryable GroupBy(IQueryable query, Type type, string path)
{
var parameter = Expression.Parameter(type, "t");
var field = QueryableHelpers.ResolvePathForExpression(parameter, path);
var lambda = Expression.Lambda(field, parameter);
var genericMethod = Constants.GroupByMethod.MakeGenericMethod(type, field.Type);
var groupByEpression = Expression.Call(genericMethod, query.Expression, lambda);
var result = query.Provider.CreateQuery(groupByEpression);
return result;
}
private static IQueryable GroupByAnonymousObject(IQueryable query, Type type, ParameterExpression parameter, List<Expression> fields)
{
throw new NotSupportedException();
/*
var dynamicAssemblyName = new AssemblyName("PoweredSoft.DynamicLinq.DynamicTypes");
var dynamicAssembly = AssemblyBuilder.DefineDynamicAssembly(dynamicAssemblyName, System.Reflection.Emit.AssemblyBuilderAccess.Run);
System.Reflection.Emit.ModuleBuilder dynamicModule = dynamicAssembly.DefineDynamicModule("TempAssembly");
TypeBuilder dynamicAnonymousType = dynamicModule.DefineType("AnonymousType", TypeAttributes.Public);
int i = 0;
fields.ForEach(field =>
{
var fieldName = $"A_{++i}"; // tODO
dynamicAnonymousType.DefineField(fieldName.
});
dynamicAnonymousType.DefineField(, typeof(TFieldA), FieldAttributes.Public);
dynamicAnonymousType.DefineField(fieldNameB, typeof(TFieldB), FieldAttributes.Public);
return dynamicAnonymousType.CreateType();
throw new NotImplementedException(); */
}
/// <summary>
/// Returns the right expression for a path supplied.
/// </summary>