mvc entity framework select with dynamic where clause - entity-framework

Question

I am doing a asp.net-mvc with entity-framework App.
I have a select instruction, where I need to have a dymanic where condition.
It is a common case where you have a filter composed by a string like "aaaa bbbb cccc". I need to bring all data that contains all the filter string or part of it.
I doing part ot it witt Split function, but it is difficult to get all posible combinations.
I Would rather use a Store Procedure. But the porpose of it, is to use Entity Framework.
As far I did this.
public IEnumerable<UploadSearch> GetUploadsBySearch(string search)
{
IEnumerable<UploadSearch> viewModel = (from uploads in _db.Uploads
.Where(p => p.ProcessState_id == Security.APPROVED && p.Finder.Contains(search))
.OrderByDescending(p => p.UploadDate)
select new UploadSearch
{
User_id = uploads.User_id,
UserName = uploads.Users.Name,
UserLastName = uploads.Users.LastName,
});
And I Add a for instruction to loop throu the string,
string[] param = search.Replace(" "," ").Split(' ');
string _param = "";
int large = param.Length;
for (int i=0;i<large-1;i++)
{
_param +=param[i] ' ' + param[i + 1];
IEnumerable<UploadSearch> _viewModel = (from uploads in _db.Uploads
.Where(p => p.ProcessState_id == Security.APPROVED && p.Finder.Contains(_param))
.OrderByDescending(p => p.UploadDate)
select new UploadSearch
{
User_id = uploads.User_id,
UserName = uploads.Users.Name,
UserLastName = uploads.Users.LastName,
});
viewModel = viewModel.Union(_viewModel);
}
And I use a Union clause.
But There has to be another way to do it.
Any Ideas?

Answer 1

You should use LinqKit, it has a PredicateBuilder class that allows you to dynamically build queries
https://github.com/scottksmith95/LINQKit#predicatebuilder
IQueryable<Product> SearchProducts (params string[] keywords)
{
var predicate = PredicateBuilder.New<Product>();
foreach (string keyword in keywords)
{
string temp = keyword;
predicate = predicate.Or (p => p.Description.Contains (temp));
}
return dataContext.Products.Where (predicate);
}