Select All Rows Using Entity Framework

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

User · Answer

Old post I know  but using Select x   gt  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 lt User gt  GetUser Guid userId  string userGroup  bool noTracking   false        IQueryable lt User gt  queryable    context Users Select x   gt  x        if  string IsNullOrEmpty userGroup           queryable   queryable Where x   gt  x UserGroup    userGroup        if noTracking          queryable   queryable AsNoTracking         return await queryable FirstOrDefaultAsync x   gt  x userId    userId

User · Answer

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

User · Answer

You can use    ptx  tablename  Select  o   gt  true

User · Answer

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

User · Answer

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   gt  p Field Equals  some filter

User · Answer

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

User · Answer

I used the entitydatasource and it provide everything I needed for what I wanted to do    repository  tablename  ToList

User · Answer

You can use this code to select all rows    C     var allStudents    modelname   tablename  Select x   gt  x  ToList

[asp.net] Select All Rows Using Entity Framework

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