GetProperty(“pname”) returns null

I want to get value for a dynamic property of a dynamic object.
Here is my Code..

public string ReturnProperty(object ob, string prop)
{            
    Type type = ob.GetType();
    PropertyInfo pr = type.GetProperty(prop);

    //Here pr is null..Dont know whats wrong

    return pr.GetValue(ob, null).ToString();
}

Answers:

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Method 1

My guess is that either it isn’t a public property, or you’ve got the name wrong, or it isn’t a property at all (but a public field).

It’s impossible to say more without knowing what the actual type is, but that should be a start.

You mention that this is a “dynamic object” but that’s not really very descriptive. Bear in mind that the CLR itself doesn’t know anything about the DLR – if you mean this is a type which implements IDynamicMetaObjectProvider or extends DynamicObject, then you won’t be able to get at the properties with “normal” reflection like this.

Method 2

In my case ob did not have pr getter setter properly.

//causes GetProperty to return null
public class MyClass{
    public object pr;
}

//Works
public class MyClass{
    public object pr { get; set; }
}

Method 3

In my case, I had to define get and set. See post above

public string MyPropertyName { get; set; }

After this I could get the property by:

typeof(MyClassItem).GetProperty("PropertyName")

Method 4

If the item you are attempting to access doesn’t have getter and setter accessors, then most likely it is a field.

So your code would work as follows:

FieldInfo fieldInfo = type.GetField(fieldName);

Method 5

Try the
Type.GetProperty(String, BindingFlags)
overloads and select the right binding flags.

Method 6

Example for ExpandoObject(it implements IDynamicMetaObjectProvider Jon Skeet mentioned):

    public static string ReturnProperty(object ob, string prop)
    {
        if (ob is ExpandoObject)
        {
            return ((ExpandoObject)ob).Single(e => e.Key == prop).Value.ToString();
        }
        Type type = ob.GetType();
        PropertyInfo pr = type.GetProperty(prop);
        return pr.GetValue(ob, null).ToString();
    }

    //--

    dynamic dyna = new ExpandoObject();

    dyna.Name = "Element";

    Console.WriteLine(ReturnProperty(dyna, "Name"));

Method 7

I just came across this issue when I was passing in the wrong data of a sorted grid view in an MVC project.

        public HolidaysGridViewModel()
    {
        this.Sort = "HolidayDate"; // this was the wrong name 
        this.SortDir = "ASC";
    }

It made me realize after reading your question that you were most likely passing in the name of a business from the database instead of the name of the database column object and therefore no were results were found which may have been the cause of your null value.

Method 8

I tried this & it worked.

public string ReturnProperty(object ob, string prop)
{
    Type type = ob.GetType();
    PropertyInfo pr = type.GetProperty(prop);
    //Here pr is null..Dont know whats wrong
    return pr.GetValue(ob, null).ToString();
}

ReturnProperty(new { abc = 10 }, "abc");

Whats wrong???

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0