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FilteredDbSet.cs
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FilteredDbSet.cs
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using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;
using System.Linq;
using System.Linq.Expressions;
namespace DevelopmentWithADot.EntityFrameworkFilters
{
public class FilteredDbSet<TEntity> : IDbSet<TEntity>, IOrderedQueryable<TEntity> where TEntity : class
{
#region Private readonly fields
private readonly DbSet<TEntity> _set;
private readonly Action<TEntity> _initializeEntity;
private readonly Func<TEntity, Boolean> _matchesFilter;
#endregion
#region Public constructors
public FilteredDbSet(DbContext context, Expression<Func<TEntity, Boolean>> filter) : this(context.Set<TEntity>(), filter, null)
{
}
public FilteredDbSet(DbContext context, Expression<Func<TEntity, Boolean>> filter, Action<TEntity> initializeEntity) : this(context.Set<TEntity>(), filter, initializeEntity)
{
}
#endregion
#region Private constructor
private FilteredDbSet(DbSet<TEntity> set, Expression<Func<TEntity, Boolean>> filter, Action<TEntity> initializeEntity)
{
this._set = set;
this.Filter = filter;
this._matchesFilter = filter.Compile();
this._initializeEntity = initializeEntity;
}
#endregion
#region Public properties
public Expression<Func<TEntity, Boolean>> Filter
{
get;
protected set;
}
public IQueryable<TEntity> Unfiltered
{
get
{
return (this._set);
}
}
#endregion
#region Public methods
public IQueryable<TEntity> Include(String path)
{
return (this._set.Include(path).Where(this.Filter));
}
/*public IQueryable<TEntity> Include<TProperty>(Expression<Func<TEntity, TProperty>> path)
{
return (this._set.Include(path));
}*/
public DbSqlQuery<TEntity> SqlQuery(String sql, params Object[] parameters)
{
return (this._set.SqlQuery(sql, parameters));
}
#endregion
#region IDbSet<TEntity> Members
TEntity IDbSet<TEntity>.Add(TEntity entity)
{
this.InitializeEntity(entity);
this.ThrowIfEntityDoesNotMatchFilter(entity);
return (this._set.Add(entity));
}
TEntity IDbSet<TEntity>.Attach(TEntity entity)
{
this.ThrowIfEntityDoesNotMatchFilter(entity);
return (this._set.Attach(entity));
}
TDerivedEntity IDbSet<TEntity>.Create<TDerivedEntity>()
{
var entity = this._set.Create<TDerivedEntity>();
this.InitializeEntity(entity);
return (entity as TDerivedEntity);
}
TEntity IDbSet<TEntity>.Create()
{
var entity = this._set.Create();
this.InitializeEntity(entity);
return (entity);
}
TEntity IDbSet<TEntity>.Find(params Object[] keyValues)
{
var entity = this._set.Find(keyValues);
ThrowIfEntityDoesNotMatchFilter(entity);
return (entity);
}
TEntity IDbSet<TEntity>.Remove(TEntity entity)
{
ThrowIfEntityDoesNotMatchFilter(entity);
return (this._set.Remove(entity));
}
ObservableCollection<TEntity> IDbSet<TEntity>.Local
{
get { return (this._set.Local); }
}
#endregion
#region IEnumerable<TEntity> Members
IEnumerator<TEntity> IEnumerable<TEntity>.GetEnumerator()
{
return (this._set.Where(this.Filter).GetEnumerator());
}
#endregion
#region IEnumerable Members
IEnumerator IEnumerable.GetEnumerator()
{
return ((this as IEnumerable<TEntity>).GetEnumerator());
}
#endregion
#region IQueryable Members
Type IQueryable.ElementType
{
get { return ((this._set as IQueryable).ElementType); }
}
Expression IQueryable.Expression
{
get
{
return (this._set.Where(this.Filter).Expression);
}
}
IQueryProvider IQueryable.Provider
{
get
{
return ((this._set as IQueryable).Provider);
}
}
#endregion
#region Private methods
private void ThrowIfEntityDoesNotMatchFilter(TEntity entity)
{
if ((entity != null) && (this._matchesFilter(entity) == false))
{
throw (new ArgumentException("Entity does not match filter", "entity"));
}
}
private void InitializeEntity(TEntity entity)
{
if (this._initializeEntity != null)
{
this._initializeEntity(entity);
}
}
#endregion
}
}