Select All Rows Using Entity Framework - asp.net

Question

I'm trying to select all the rows out of a database using entity framework for manipulation before they're sent to the form
var ptx = [modelname].[tablename]();
ptx.[tablename].Select(????)
what goes in the ????

Answer 1

I used the entitydatasource and it provide everything I needed for what I wanted to do.
_repository.[tablename].ToList();

Answer 2

Entity Framework has one beautiful thing for it, like :
var users = context.Users;
This will select all rows in Table User, then you can use your .ToList() etc.
For newbies to Entity Framework, it is like :
PortalEntities context = new PortalEntities();
var users = context.Users;
This will select all rows in Table User

Answer 3

How about:
using (ModelName context = new ModelName())
{
var ptx = (from r in context.TableName select r);
}
ModelName is the class auto-generated by the designer, which inherits from ObjectContext.

Answer 4

You can use this code to select all rows :
C# :
var allStudents = [modelname].[tablename].Select(x => x).ToList();

Answer 5

You can simply iterate through the DbSet context.tablename
foreach(var row in context.tablename)
Console.WriteLn(row.field);
or to evaluate immediately into your own list
var allRows = context.tablename.ToList();

Answer 6

If it's under a async method then use ToListAsync()
public async Task<List<DocumentTypes>> GetAllDocumentTypes()
{
var documentTypes = await _context.DocumentTypes.ToListAsync();
return documentTypes;
}

Answer 7

Old post I know, but using Select(x => x) can be useful to split the EF Core (or even just Linq) expression up into a query builder.
This is handy for adding dynamic conditions.
For example:
public async Task<User> GetUser(Guid userId, string userGroup, bool noTracking = false)
{
IQueryable<User> queryable = _context.Users.Select(x => x);
if(!string.IsNullOrEmpty(userGroup))
queryable = queryable.Where(x => x.UserGroup == userGroup);
if(noTracking)
queryable = queryable.AsNoTracking();
return await queryable.FirstOrDefaultAsync(x => x.userId == userId);
}

Answer 8

Here is a few ways to do it (Just assume I'm using Dependency Injection for the DbConext)
public class Example
{
private readonly DbContext Context;
public Example(DbContext context)
{
Context = context;
}
public DbSetSampleOne[] DbSamples { get; set; }
public void ExampleMethod DoSomething()
{
// Example 1: This will select everything from the entity you want to select
DbSamples = Context.DbSetSampleOne.ToArray();
// Example 2: If you want to apply some filtering use the following example
DbSamples = Context.DbSetSampleOne.ToArray().Where(p => p.Field.Equals("some filter"))
}

Answer 9

You can use:
ptx.[tablename].Select( o => true)