Accessing object properties from string representations

Accessing object properties from string representations

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Accessing object properties from string representations
Tag : chash , By : Jonathan
Date : January 02 2021, 06:48 AM

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Accessing object properties from string representations

Tag : chash , By : gorbiz
Date : March 29 2020, 07:55 AM
help you fix your problem After hitting my head against the problem for a while and hoping on a train home last night I decided that I would try and bash out an answer. Using a combination of Jon's pointers and Frederik's use of the PropertyInfo class and keeping the original idea of switching on the underlying object type, this is what I came up with ...
    private void Sort_version2(string propertyName)
        // convert to list
        List<MyClass> myCurrentClass = Items as List<MyClass>;

        string typeOfProperty;
        PropertyInfo pi;

        // sort
        if ((myCurrentClass != null) && (MyClass.HasDetailAndExtract(propertyName, out typeOfProperty, out pi)))
                case "System.String":
                    myCurrentClass.Sort(delegate(MyClass one, MyClass two)
                                                    Comparer<string>.Default.Compare(pi.GetValue(one, null).ToString(),
                                                                                     pi.GetValue(two, null).ToString());

                case "System.Int32":
                    myCurrentClass.Sort(delegate (MyClass one, MyClass two)
                                                        Convert.ToInt32(pi.GetValue(one, null)),
                                                        Convert.ToInt32(pi.GetValue(two, null)));
                    throw new NotImplementedException("Type of property not implemented yet");

Accessing string representations of constant field values in java

Tag : java , By : user109127
Date : March 29 2020, 07:55 AM
Any of those help If you can change the class which contains these constants, it would be better to make it an enum with a value() method.
Otherwise, I would suggest building a Map once using reflection, and then just doing map lookups:
Map<Integer, String> valueToStringMap = new HashMap<>();
for (Field field : Foo.class.getFields()) {
    int modifiers = field.getModifiers();
    if (field.getType() == Integer.class && Modifier.isPublic(modifiers)
        && Modifier.isStatic(modifiers)) {
        valueToStringMap.put((Integer) field.get(null), field.getName());

Accessing the properties of an object with a string in Swift

Tag : swift , By : jaime
Date : March 29 2020, 07:55 AM
wish of those help There is no way to do it that would work for any Swift class. However, you can do this:
class User: NSObject {
    dynamic var username: String = "admin"
    dynamic var password: String = "123456"

let u = User()
u.valueForKey("username") // admin

C# Building Expressions in Linq-to-Entities, Searching all properties' string representations in a type

Tag : chash , By : Robert MacGregor
Date : March 29 2020, 07:55 AM
it fixes the issue I do this without Equals because doesn't in the scope and i will need create some attr or flag to set what prop will be filtered Exactly or Likely, and i just go 1 level in depth of the navigations, so maybe this can help you to understand:
private static readonly MethodInfo ToStringMethod = typeof(object).GetMethod("ToString");
private static readonly MethodInfo StringContainsMethod = typeof(string).GetMethod("Contains");

public static Expression<Func<T, bool>> BuildFilterPredicate<T>(string q)
    var query = Expression.Constant(q);
    var type = typeof(T);
    var lambdaParam = Expression.Parameter(type);
    var predicates = type.GetProperties().SelectMany(p => PredicateContainsBuilder(lambdaParam, p, query)).ToList();
    Expression body = predicates[0];
    body = predicates.Skip(1).Aggregate(body, Expression.OrElse);
    return Expression.Lambda<Func<T, bool>>(body, lambdaParam);

private static IEnumerable<MethodCallExpression> PredicateContainsBuilder(Expression lambdaParam, PropertyInfo prop, Expression query)

    if (prop.PropertyType.IsClass)
        return new List<MethodCallExpression> { Expression.Call(Expression.Call(Expression.Property(lambdaParam, prop), ToStringMethod), StringContainsMethod, query) };

    var properties = prop.PropertyType.GetProperties();
    return properties.Select(p => Expression.Call(Expression.Call(Expression.Property(lambdaParam, p), ToStringMethod), StringContainsMethod, query)).ToList();

PHP accessing deeper object properties through string variable

Tag : php , By : Harvey
Date : March 29 2020, 07:55 AM
With these it helps I have this simple function to not get any warnings when a property doesn't exist: , You can explode argument by -> and iterate it. try below solution:
function getProperty($object, $property, $default = ""){

    $properties = explode('->', $property);

        foreach($properties as $val){
                $object = $object->$val;
            } else{

    if (!is_object($object) && $object) return $object;

    return $default;

$o = new stdClass();
$o->name = "Peter";

echo $name = getProperty($o, 'name', 'No name'); //output: Peter
echo $email = getProperty($o, 'email', 'No email'); //output: No email

$o = new stdClass();
$o->wife = new stdClass();
$o->wife->name = "Olga";

echo getProperty($o, "wife->name", "No name"); //output: Olga
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