How get property value of nested classes using reflection

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Currently in my class DataEntries I have to sub class, UserObjects and TagObjects. I am trying to access the properties of TagObjects in my test class.. I have another class where these objects are serialized which is DataProvider class. I am using this Reflection helper but I am unable to pick the properties. My goal is to get the response from the API and place that response ID in the property I tell my refection helper assign it to. I succesfully get the response from the API, but I am unable to then place the response value in the property of my choice in the DataEntries class of TagObjects subclass property

C#

//Here is the class of DataEntries 
public class DataEntries
{
    public class UserObjects
    {
        public string UserId { get; set; }
        public string UserId2 { get; set; }
    }

    public class TagObjects
    {
        public int id { get; set; }
        public string name { get; set; }
        public int type { get; set; } 
        public TagObjects Child { get; set; }
    }
}

What I have tried:

C#

//Refection helper
public static class ReflectionHelper 
{
    public static dynamic GetPropValue(this Object obj, String propName)
    {
        string[] nameParts = propName.Split('.');
        if (nameParts.Length == 1)
        {
            return obj.GetType().GetProperty(propName).GetValue(obj, null);
        }
        
        foreach (String part in nameParts)
        {
            if (obj == null) { return null; }
        
            Type type = obj.GetType();
            PropertyInfo info = type.GetProperty(part);
            if (info == null) { return null; }
        
            obj = info.GetValue(obj, null);
        }
        return obj;
    }
    
}

Not sure if this will help up Here is my DataProvider class and method for to help place my query parameters when calling the API

C#

public class DataProvider 
{
    public DataEntries DataEntries { get; private set; }

    public DataProvider ()
    {
        DataEntries = new DataEntries();
    }

    public Dictionary<string, object> DataProviderQueryParams(dynamic matchKey)
    {
         DataEntries dataEntries = new DataEntries();
        string data = JsonConvert.SerializeObject(dataEntries);
        Dictionary<string, object> Items = JsonConvert.DeserializeObject<Dictionary<string, object>>(data);
        if (Items.TryGetValue(matchKey, out object value))
        {

            return new Dictionary<string, object> { { matchKey, value } };
        }


        return null;
    }
}

Test class usage

C#

public class TestClass
{
    DataProvider dataprovider = new DataProvider();

    [Test]
    public void GetTagList()
    {
        parsedResponse = JToken.Parse(HttpGet(baseUrl, TestUtil.BasePath(), token, client).Content);
        tagId = parsedResponse.Last["id"].ToString();
    
        var tagId = dataprovider.GetPropValue("DataEntries.id");
        // Getting TagId as Null..
    }
}

Posted 10-Jun-20 15:09pm

Member 14779968

Updated 10-Jun-20 23:44pm

Richard Deeming

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Richard Deeming · Answer 1 · 2020-06-10T23:45:00

As shown, your DataEntries class doesn't have any properties, so there's nothing to drill down into.

Assuming you actually have some properties in there:

C#

public class DataEntries
{
    public class UserObjects
    {
        public string UserId { get; set; }
        public string UserId2 { get; set; }
    }

    public class TagObjects
    {
        public int id { get; set; }
        public string name { get; set; }
        public int type { get; set; } 
        public TagObjects Child { get; set; }
    }
    
    public UserObjects User { get; set; }
    public TagObjects Tag { get; set; }
}

then your reflection code will work as expected:

C#

var entry = new DataEntries
{
    User = new DataEntries.UserObjects
    {
        UserId = "42",
        UserId2 = "64",
    },
    Tag = new DataEntries.TagObjects
    {
        id = 42,
        name = "Ford",
        type = 11,
    },
};

var value = entry.GetPropValue("Tag.name");
Console.WriteLine(value);
// Output: Ford

Demo[^]