protected override ConstantExpression ProcessOperation(
Type resultType,
TranslatedQueryable translatedQueryable,
Expression?selector,
CancellationToken cancellation)
{
var elementType = translatedQueryable.ElementType;
var returnType = TypeHelper.GetValueTaskType(resultType);
AsyncTypeAwaitable evaluationResult;
if (selector is not null)
{
evaluationResult = translatedQueryable.QueryAdapter.MaxAsync(
elementType,
resultType,
translatedQueryable.GetQueryable(),
selector,
cancellation);
}
else
{
evaluationResult = translatedQueryable.QueryAdapter.MaxAsync(
elementType,
translatedQueryable.GetQueryable(),
cancellation);
}
return(Expression.Constant(evaluationResult.Instance, returnType));
}
protected override ConstantExpression ProcessOperation(
TranslatedQueryable translatedQueryable,
Expression?predicate,
CancellationToken cancellation)
{
var elementType = translatedQueryable.ElementType;
var returnType = typeof(ValueTask <System.Boolean>);
ValueTask <System.Boolean> evaluationResult;
if (predicate is not null)
{
evaluationResult = translatedQueryable.QueryAdapter.AnyAsync(
elementType,
translatedQueryable.GetQueryable(),
predicate,
cancellation);
}
else
{
evaluationResult = translatedQueryable.QueryAdapter.AnyAsync(
elementType,
translatedQueryable.GetQueryable(),
cancellation);
}
return(Expression.Constant(evaluationResult, returnType));
}
protected override ConstantExpression ProcessOperation(
TranslatedQueryable translatedQueryable,
Expression?predicate,
CancellationToken cancellation)
{
var elementType = translatedQueryable.ElementType;
var returnType = TypeHelper.GetValueTaskType(elementType);
var queryable = translatedQueryable.GetQueryable();
AsyncTypeAwaitable evaluationResult;
if (predicate is null)
{
// TODO: Why are there overloads without a predicate, if we can just pass null in the more general
// overload?
if (ReturnDefaultOnNoMatch)
{
evaluationResult = translatedQueryable.QueryAdapter.FirstOrDefaultAsync(
elementType,
queryable,
cancellation);
}
else
{
evaluationResult = translatedQueryable.QueryAdapter.FirstAsync(
elementType,
queryable,
cancellation);
}
}
else
{
if (ReturnDefaultOnNoMatch)
{
evaluationResult = translatedQueryable.QueryAdapter.FirstOrDefaultAsync(
elementType,
queryable,
predicate,
cancellation);
}
else
{
evaluationResult = translatedQueryable.QueryAdapter.FirstAsync(
elementType,
queryable,
predicate,
cancellation);
}
}
return(Expression.Constant(evaluationResult.Instance, returnType));
}
protected abstract ConstantExpression ProcessOperation(
TranslatedQueryable translatedQueryable,
Expression?predicate,
CancellationToken cancellation);
