convert IEnumerable<T> to IQueryable<T> where T is unknown

Question

I have a BindingSource whose DataSource (defined as an object) could be any type of IEnumerable class at runtime (such as IList<Foo>). I need to convert it to an IQueryable<T> so that I can pass it in to a generic extension:

IOrderedQueryable<TEntity> OrderUsingSortExpression<TEntity>(this IQueryable<TEntity> source, string sortExpression) where TEntity : class

So far I have this:

string order = "Message ASC";
Type thetype = bsTotalBindingSource.DataSource.GetType().GetGenericArguments()[0];
IEnumerable<object> totalDataSource = ((IEnumerable<object>)(bsTotalBindingSource.DataSource));
//Blowing up on this next line with 'System.Linq.Queryable is not a GenericTypeDefinition. MakeGenericType may only be called on a type for which Type.IsGenericTypeDefinition is true.'
MethodInfo asQueryableMethod = typeof(Queryable).MakeGenericType(thetype).GetMethod("AsQueryable", BindingFlags.Static | BindingFlags.Public, null, new[] { typeof(IQueryable<>) }, null); 
MethodInfo genericAsQueryableMethod = asQueryableMethod.MakeGenericMethod(thetype);
MethodInfo orderUsingSortExpressionMethod = GetType().GetMethod("OrderUsingSortExpression");
MethodInfo genericUsingSortExpressionMethod = orderUsingSortExpressionMethod.MakeGenericMethod(thetype);
bsTotalBindingSource.DataSource = genericUsingSortExpressionMethod.Invoke(this, new object[] { genericAsQueryableMethod.Invoke(totalDataSource, null), order });

As you can see, the end goal here is to be able to take something from a DataSource, get its RuntimeType of IEnumerable<T> where T can be whatever, then call AsQueryable<T> so it can be passed into a function which accepts an IQueryable<T>.

EDIT After digging around to find specifically the methods I am looking for I have gotten a bit farther on the problem. It now looks like this:

string order = "Message ASC";
Type thetype = bsTotalBindingSource.DataSource.GetType().GetGenericArguments()[0];
//Returns the AsQueryable<> method I am looking for
MethodInfo asQueryableMethod = typeof(Queryable).MakeGenericType(thetype).GetMethods()[1]; 
MethodInfo genericAsQueryableMethod = asQueryableMethod.MakeGenericMethod(thetype);
MethodInfo orderUsingSortExpressionMethod = typeof(SortExtension)GetType().GetMethods()[0];
MethodInfo genericUsingSortExpressionMethod = orderUsingSortExpressionMethod.MakeGenericMethod(thetype);
bsTotalBindingSource.DataSource = genericUsingSortExpressionMethod.Invoke(this, new object[] { genericAsQueryableMethod
//blows up here with 'Object of type 'System.RuntimeType' cannot be converted to type 'System.Collections.Generic.IEnumerable`1[LogRecordDTO]'.'
.Invoke(bsTotalBindingSource.DataSource, new object[] {thetype}), order });

Answer 1

You say you want to convert IEnumerable<T> to IQueryable<T> where T's type is unknown.

private void Test<T>(IEnumerable<T> x)
{
    var queryableX = x.AsQueryable();
}

NOTE: you need to be using System.Linq.