private Expression Prepare(Expression cachedExpression, ParameterBag parameters)
{
Expression result;
if (parameters.Any())
{
var visitor = new ConstantExpressionReplacementVisitor(parameters);
result = visitor.Visit(cachedExpression);
}
else
{
result = cachedExpression;
}
// perform null-propagation if this feature is enabled.
if (_configurationProvider.EnableNullPropagationForQueryMapping)
{
var nullVisitor = new NullsafeQueryRewriter();
return(nullVisitor.Visit(result));
}
return(result);
}
private Expression Prepare(Expression cachedExpression, object parameters)
{
Expression result;
if (parameters != null)
{
var visitor = ParameterExpressionVisitor.Create(parameters);
result = visitor.Visit(cachedExpression);
}
else
{
result = cachedExpression;
}
// perform null-propagation if this feature is enabled.
if (_configurationProvider.EnableNullPropagationForQueryMapping)
{
var nullVisitor = new NullsafeQueryRewriter();
return(nullVisitor.Visit(result));
}
return(result);
}
public Expression CreateMapExpression(Type sourceType, Type destinationType, IDictionary <string, object> parameters = null, params MemberInfo[] membersToExpand)
{
parameters = parameters ?? new Dictionary <string, object>();
var cachedExpression = _expressionCache.GetOrAdd(new ExpressionRequest(sourceType, destinationType, membersToExpand, null));
Expression x = cachedExpression;
if (parameters.Any())
{
var visitor = new ConstantExpressionReplacementVisitor(parameters);
x = visitor.Visit(cachedExpression);
}
// perform null-propagation if this feature is enabled.
if (_configurationProvider.EnableNullPropagationForQueryMapping)
{
var nullVisitor = new NullsafeQueryRewriter();
return(nullVisitor.Visit(x));
}
return(x);
}
