/// <summary>
/// Finds an entity with the given primary key values.
/// </summary>
public static TEntity Find <TEntity>(
this EFCachedDbSet <TEntity> cachedQueryable, params object[] keyValues)
where TEntity : class
{
var query = buildFindQueryable(cachedQueryable, keyValues);
return(new EFCachedQueryable <TEntity>(
query, cachedQueryable.CachePolicy, cachedQueryable.DebugInfo,
cachedQueryable.CacheKeyProvider, cachedQueryable.CacheServiceProvider).FirstOrDefault());
}
private static IQueryable <TEntity> buildFindQueryable <TEntity>(
EFCachedDbSet <TEntity> cachedQueryable, object[] keyValues)
where TEntity : class
{
var set = cachedQueryable.Query;
var context = set.GetInfrastructure().GetRequiredService <IDbContextServices>().CurrentContext.Context;
var keyProperties = context.Model.FindEntityType(typeof(TEntity)).FindPrimaryKey().Properties;
if (keyProperties.Count != keyValues.Length)
{
if (keyProperties.Count == 1)
{
throw new ArgumentException(
CoreStrings.FindNotCompositeKey(typeof(TEntity).ShortDisplayName(), keyValues.Length));
}
throw new ArgumentException(
CoreStrings.FindValueCountMismatch(typeof(TEntity).ShortDisplayName(), keyProperties.Count,
keyValues.Length));
}
for (var i = 0; i < keyValues.Length; i++)
{
if (keyValues[i] == null)
{
throw new ArgumentNullException(nameof(keyValues));
}
var valueType = keyValues[i].GetType();
var propertyType = keyProperties[i].ClrType;
if (valueType != propertyType)
{
throw new ArgumentException(
CoreStrings.FindValueTypeMismatch(
i, typeof(TEntity).ShortDisplayName(), valueType.ShortDisplayName(),
propertyType.ShortDisplayName()));
}
}
IQueryable <TEntity> query = context.Set <TEntity>().AsNoTracking();
var parameter = Expression.Parameter(typeof(TEntity), "x");
for (var i = 0; i < keyProperties.Count; i++)
{
var property = keyProperties[i];
var keyValue = keyValues[i];
var expression = Expression.Lambda(
Expression.Equal(
Expression.Property(parameter, property.Name),
Expression.Constant(keyValue)),
parameter) as Expression <Func <TEntity, bool> >;
query = query.Where(expression);
}
return(query);
}
/// <summary>
/// Finds an entity with the given primary key values.
/// </summary>
public static Task <TEntity> FindAsync <TEntity>(
this EFCachedDbSet <TEntity> cachedQueryable,
object[] keyValues,
CancellationToken cancellationToken) where TEntity : class
{
var query = buildFindQueryable(cachedQueryable, keyValues);
return(new EFCachedQueryable <TEntity>(
query, cachedQueryable.CachePolicy, cachedQueryable.DebugInfo,
cachedQueryable.CacheKeyProvider, cachedQueryable.CacheServiceProvider).FirstOrDefaultAsync(cancellationToken));
}
/// <summary>
/// Finds an entity with the given primary key values.
/// </summary>
public static Task <TEntity> FindAsync <TEntity>(
this EFCachedDbSet <TEntity> cachedQueryable,
params object[] keyValues) where TEntity : class
{
return(cachedQueryable.FindAsync(keyValues, default(CancellationToken)));
}