Linq-如何在Linq中获取查询结果并将其添加到数组

Question

I use c#, linq and EF4 I would like ask your help.

My question: I have a linq query, but i need the result for this query be inserted in an array string. Value added should be Title and ContentId (ContentId from EF is an INT but i need it as a string)

Please let me know, many thanks in advances!PS: Please post the full code :-)

       public static string[] GetCompletionList(string prefixText, string count)
{
    using (CmsConnectionStringEntityDataModel context = new CmsConnectionStringEntityDataModel())
    {
    var queryTitle = (from content in context.CmsContents
                      select new
                      {
                          Title = content.Title, // String
                          ContentId = content.ContentId.ToString() // Int
                      }).ToArray();
    return queryTitle;


    }

Answer 1

If you want to have ContentId as a string, then do this:

var queryTitle = (from content in context.CmsContents
                 select new
                 {
                     Title = content.Title, // String
                     ContentId = content.ContentId.ToString() // Int
                 }).ToArray();

queryTitle will be an array of the anonymous type created, which has two properties:

1. Title
2. ContentId

Both of type string.

If you don't want to have an array of the anonymous type, but an array of strings, then use this code:

var queryTitles = (from content in context.CmsContents
                 select "Title: " + content.Title + ", ContentId: " +  content.ContentId.ToString()).ToArray();

Answer 2

if you are looking to have contentID and Title in one big array of string (from your question, it sounds like that but not very clear), you might want to try this

var resultArray = titlesAsArray
            .Select(a => new[]
                             {
                                 a.ContentId.ToString(), a.Title
                             })
            .SelectMany(x => x).ToArray();

or to modifiy your original query

var resultArray = context.CmsContents.Select(content => new[]
                                 {
                                     content.ContentId.ToString(), content.Title
                                 }).SelectMany(content => content).ToArray();

Answer 3

var strings = from content in context.CmsContents
              select string.Format ("{0} {1}",
                  content.ContentId,
                  content.Title
              );

That should help you.
Note that it's a common misconception that you need an array to work with query results—in fact, you don't, the result is already IEnumerable . If you're sure that you need an array, just wrap query in parentheses and call ToArray extension method on the result.