An explicit conversion exists (are you missing a cast?)

Question

I have a method that gives me the groupID of users and then I want to get the news based on the user\'s GroupID.

public IEnumerable Getnews(int G         


        

Answer 1

Getnews returns an IEnumerable<News> (i.e. multiple News) and you are trying to assign it to News news (i.e. a single News item). That doesn't work.

There are two possibilities, depending on what you want to do.

If you want to use all the news, change News news to IEnumerable<News>:

IEnumerable<News> news = newsService.Getnews(GroupID);

If you want to use only a single news, use FirstOrDefault:

News news = newsService.Getnews(GroupID).FirstOrDefault();

Depending on what you expect, you also could use one of the following:

• First(): You expect Getnews to always return at least one news. This will throw an exception if no news are returned.
• Single(): You expect Getnews to always return exactly one news. This will throw an exception if more than one or zero news are returned.
• SingleOrDefault(): You expect zero or one news to be returned. This will throw an exception if more than one news are returned.

Answer 2

An explicit conversion exists (are you missing a cast?) I was facing same problem in my C# code. I was writing code in VS. I checked full code, and I get reason behind this error. I missed 'I' in my explicit Interface name.

Picture with Error

Error Solution

Answer 3

Getnews returns a collection of news items, and your line is expecting a single news item.

You could try

News news = newsServices.Getnews(GroupID).FirstOrDefault();

or expect an ineumerable

IEnumerable<News> news = newsService.GetNews(GroupID);

Answer 4

This is what you want

IEnumerable<News> news = newsService.Getnews(GroupID);

or maybe something like:

News news = newsService.Getnews(GroupID).FirstOrDefault();

Answer 5

This line is setting a variable which is defined as a single instance of News to an instance of IEnumerable :

News news = newsService.Getnews(GroupID);

You want to change to

IEnumerable<News> = newsService.Getnews(GroupID);

Basically you are trying to set a collection of News to a single reference of News.

Answer 6

return newsRepository.GetMany(constraint); returns an IEnumerable<News>, you should do:

 return newsRepository.GetMany(constraint).FirstOrDefault();

return the first News if it is found in newRepository, null otherwise