实体框架SQL语句

Question

I want to query the table News from the database called StiriDB . There I want take all the entries that have in the Description field the word Stored in SearchTxt . I can't quite figure out what the SqlQuery method wants from me ... This is the code:

public IQueryable<News> GetProducts()
{
    var _db = new SiteStiri.Models.NewsContext();
    String SearchTxt = Convert.ToString(Request.QueryString["Cauta"]);
    String queryTxt = "Select * from StiriDB.News where Description like '%" + SearchTxt + "%'";
    IQueryable<News> query = _db.News.SqlQuery<News>(queryTxt);

    if ("DesDate".Equals(DropDownSelect.SelectedItem.Value))
    {
        query = query.OrderByDescending(u => u.ReleaseDate);
    }

    if ("AsDate".Equals(DropDownSelect.SelectedItem.Value))
    {
        query = query.OrderBy(u => u.ReleaseDate);
    }

    if ("AsAlp".Equals(DropDownSelect.SelectedItem.Value))
    {
        query = query.OrderBy(u => u.NewsTitle);
    }

    if ("DesApl".Equals(DropDownSelect.SelectedItem.Value))
    {
        query = query.OrderByDescending(u => u.NewsTitle);
    }

    return query;
}

Additional details : GetProducts is called by a ListView. SearchTxt is taken with QueryString of Request because it's an URL attribute. The many ifs are for sorting the data in ascending and descending order based on certain criteria (the ifs work, I just need the SqlQuery to work as intended);

Answer 1

Use Linq to Entities query, something like...

public IQueryable<News> GetProducts()
{
    var ctx = new SiteStiri.Models.NewsContext();

    var query = from n in ctx.News
                where n.Description.Contains(SearchTxt)
                select n;

    if ("DesDate".Equals(DropDownSelect.SelectedItem.Value))
    {
        query = query.OrderByDescending(u => u.ReleaseDate);
    }
    else if ("AsDate".Equals(DropDownSelect.SelectedItem.Value))
    {
        query = query.OrderBy(u => u.ReleaseDate);
    }
    else if ("AsAlp".Equals(DropDownSelect.SelectedItem.Value))
    {
        query = query.OrderBy(u => u.NewsTitle);
    }
    else if ("DesApl".Equals(DropDownSelect.SelectedItem.Value))
    {
        query = query.OrderByDescending(u => u.NewsTitle);
    }

    return query;
}