public static Expression ExtractParameters(
[NotNull] Expression expression,
[NotNull] QueryContext queryContext,
[NotNull] IEvaluatableExpressionFilter evaluatableExpressionFilter,
[NotNull] ISensitiveDataLogger logger)
{
var visitor = new ParameterExtractingExpressionVisitor(evaluatableExpressionFilter, queryContext, logger);
return(visitor.ExtractParameters(expression));
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public static Expression ExtractParameters(
[NotNull] Expression expression,
[NotNull] QueryContext queryContext,
[NotNull] IEvaluatableExpressionFilter evaluatableExpressionFilter,
[NotNull] IInterceptingLogger <LoggerCategory.Query> logger,
bool parameterize)
{
var visitor
= new ParameterExtractingExpressionVisitor(
evaluatableExpressionFilter,
queryContext,
logger,
parameterize);
return(visitor.ExtractParameters(expression));
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
protected override Expression VisitConstant(ConstantExpression constantExpression)
{
if (constantExpression.IsEntityQueryable())
{
var type = ((IQueryable)constantExpression.Value).ElementType;
var entityType = _queryCompilationContext.Model.FindEntityType(type)?.RootType();
if (entityType != null)
{
Expression newExpression = constantExpression;
if (entityType.FindPrimaryKey() == null)
{
IsKeylessQuery = true;
var query = entityType.GetDefiningQuery();
if (query != null &&
_entityQueryModelVisitor.ShouldApplyDefiningQuery(entityType, _querySource))
{
var parameterizedQuery
= _parameterExtractingExpressionVisitor.ExtractParameters(query.Body);
var subQueryModel = _queryModelGenerator.ParseQuery(parameterizedQuery);
newExpression = new SubQueryExpression(subQueryModel);
}
}
if (!_queryCompilationContext.IgnoreQueryFilters &&
entityType.GetQueryFilter() != null)
{
var parameterizedFilter
= (LambdaExpression)_parameterExtractingExpressionVisitor
.ExtractParameters(entityType.GetQueryFilter());
var oldParameterExpression = parameterizedFilter.Parameters[0];
var newParameterExpression = Expression.Parameter(type, oldParameterExpression.Name);
var predicateExpression
= ReplacingExpressionVisitor
.Replace(
oldParameterExpression,
newParameterExpression,
parameterizedFilter.Body);
var whereExpression
= Expression.Call(
_whereMethod.MakeGenericMethod(type),
newExpression,
Expression.Lambda(
predicateExpression,
newParameterExpression));
var subQueryModel = _queryModelGenerator.ParseQuery(whereExpression);
newExpression = new SubQueryExpression(subQueryModel);
}
return(newExpression);
}
}
return(constantExpression);
}
