protected override ConstantExpression VisitConstant(ConstantExpression expression)
{
if (IsGenericVariableQueryArgument(expression))
{
var valueProperty = expression.Value.GetType().GetProperty("Value");
var value = valueProperty.GetValue(expression.Value);
object queryArgument;
var collection = value as System.Collections.IEnumerable;
if (ReferenceEquals(null, collection) || value is string)
{
queryArgument = new VariableQueryArgument(value, valueProperty.PropertyType);
}
else
{
var elementType = TypeHelper.GetElementType(valueProperty.PropertyType);
queryArgument = new VariableQueryArgumentList(collection, elementType);
}
return(new ConstantExpression(queryArgument));
}
return(base.VisitConstant(expression));
}
protected override ConstantExpression VisitConstant(ConstantExpression node)
{
if (IsGenericVariableQueryArgument(node.CheckNotNull(nameof(node)), out var valueType))
{
var valueProperty = node.Value?.GetType().GetProperty(nameof(VariableQueryArgument <object> .Value));
var value = valueProperty?.GetValue(node.Value);
object queryArgument;
if (value.IsCollection(out var collection))
{
var elementType = valueType.GetElementTypeOrThrow();
queryArgument = new VariableQueryArgumentList(collection, elementType);
}
else
{
queryArgument = new VariableQueryArgument(value, valueProperty?.PropertyType ?? valueType);
}
return(new ConstantExpression(queryArgument));
}
return(base.VisitConstant(node));
}