Question 179631 in ASP.NET Question posted in
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How do I get all object prop. values into an array in C# (ASP.NET)?

Im trying to get all the field values of an object into an array. but the problem is the fields of the object can have other types rather than string but ultimately all the values should be a string.

So for example lets say we have a class of red

    public class Apple
    {
        public string Name { get; set; }
        public string ReleasedYear { get; set; }
        public string SweetnessType { get; set; }
        public string Color { get; set; }
        public Stem StemType { get; set; }
    }

    public class Stem
    {
        public string name { get; set; }
        public string supplier { get; set; }
    }

    var apple = new Apple()
    {
        Name = "hodor", ReleasedYear = "1999",
        SweetnessType = "FruitLevel",
        Color = "Green",
        StemType = new Stem()
        {
            name = "stemar",
            supplier = "apple"
        }
    };

    // i want to get a result of ["hodor", "1999", "fruitLevel", "green", "stemar", "apple"]

as seen above the result i want to get are all the values of all properties of the class "Apple".

i tried this and it didnt work

private List<string> GetAllStringValuesFromObject(object model)
    {
        var result = new List<string>();

        PropertyInfo[] properties = model.GetType().GetProperties();

        foreach (PropertyInfo modelProp in properties)
        {
            if (modelProp.PropertyType.IsClass)
            {
                return GetAllStringValuesFromObject(modelProp);
            } 
            
            if (modelProp.PropertyType == typeof(string))
            {
                result.Add(modelProp.GetValue(model).ToString());
            }
        }

        return result;
    }

is there a performance mindful way to do this? and can anyone help out? Thanks

Tags:

2

Answers


  1. 0

    Okay, here is a solution to the problem:

    private static List<string> GetAllStringValuesFromObject(object model)
{
    var result = new List<string>();

    PropertyInfo[] properties = model.GetType().GetProperties();

    foreach (PropertyInfo modelProp in properties)
    {
        if (modelProp.PropertyType == typeof(string))
        {
            result.Add(modelProp.GetValue(model).ToString());
        }
        else if (modelProp.PropertyType.IsClass)
        {
            // Pass in the value of the class, not the property itself, then add the result to the list.
            result.AddRange(GetAllStringValuesFromObject(modelProp.GetValue(model)));
        }
    }

    return result;
}

    In your original GetAllStringValuesFromObject() you had one key thing wrong. In the event that the modelProp being iterated over was a class, you passed in the PropertyInfo object instead of the property’s Value. Additionally, you had it setup to return at that point instead of adding to the result list so it would return nothing.

    Hope this helps clear up the issue!

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  2. 0

    Consider creating an Extension class to extend your object types. Then, you can use this extension below in any object class, such as apples, bananas, and oranges. 😉

    // Object Extensions
public static class ObjectExtensions
{
    public static List<string> GetStringValues(this object o)
    {
        var values = new List<string>(); // List of string property values
        var properties = o.GetType().GetProperties(); // Get all properties
        foreach (var property in properties) // Loop through properties
        {
            if (property.PropertyType == typeof(string)) // Check if property is string
                values.Add(property.GetValue(o).ToString()); // Add value to values
            else if (property.PropertyType.GetProperties().Length > 0) // Check if property has properties
            {
                var subValues = GetStringValues(property.GetValue(o)); // Recursion
                values.AddRange(subValues); // Add sub values to values
            }
        }
        return values;
    }
}


public class Apple
{
    public string Name { get; set; }
    public string ReleasedYear { get; set; }
    public string SweetnessType { get; set; }
    public string Color { get; set; }
    public Stem StemType { get; set; }
}

public class Stem
{
    public string name { get; set; }
    public string supplier { get; set; }
}

var apple = new Apple()
{
    Name = "hodor", ReleasedYear = "1999",
    SweetnessType = "FruitLevel",
    Color = "Green",
    StemType = new Stem()
    {
        name = "stemar",
        supplier = "apple"
    }
};

// Now you can simple call the method GetStringValues
// that is extended to all of your objects
apple.GetStringValues();
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