Question

I use EntityFramework on my ASP.NET MVC project.

Let’s say I have the entity below:

public class Project
{
    public int ProjectID { get; set; }
    public string Description { get; set; }
    public string Tags { get; set; }
}

Lets say I have the following data in my DB:

ProjectID: 1
Description: "My first element"
Tags: "one, three, five, seven"

ProjectID: 2
Description: "My second element"
Tags: "one, two, three, six"

ProjectID: 3
Description: "My third element"
Tags: "two, three, four"

I would like to collect all tags from all my records. So: “one, two, three, four, five, six, seven”

How can I do? This may seems a stupid question but I don’t know how to proceed.

Thanks.

Answer 1

You need to use string.Split() to dig out each tag in your list.

HashSet<string> allTags = new HashSet<string>();
foreach(Project project in context.Projects)
{
    string tagsList = project.Tags;
    string[] separateTags = tagsList.Split(", ", StringSplitOptions.RemoveEmptyEntries);
    foreach(string separateTag in separateTags)
    {
        allTags.Add(separateTag);
    }
}

then allTags will contain all your tags. If you want to put them in one big string again, use string.Join.