C# Reflection - Get field values from a simple class

Question

I have a class:

class A {
    public string a = \"A-val\" , b = \"B-val\";
}

I want to print the object members by reflection

Answer 1

Once fixed to get rid of the errors (lacking a semi-colon and a bad variable name), the code you've posted does work - I've just tried it and it showed the names and values with no problems.

My guess is that in reality, you're trying to use fields which aren't public. This code:

FieldInfo[] fields = data.GetType().GetFields();

... will only get public fields. You would normally need to specify that you also want non-public fields:

FieldInfo[] fields = data.GetType().GetFields(BindingFlags.Public | 
                                              BindingFlags.NonPublic | 
                                              BindingFlags.Instance);

(I hope you don't really have public fields, after all...)

Answer 2

Remember when you write fields like :

public string VarName{ get; set;}

Then actually you have this code(this is what reflection see) :

private string _varName;
public string get_VarName(){
....
}
public void set_VarName(strig value){
....
}

Answer 3

As @Stanislav say, you must keep in mind the backing fields generated by the compiler for properties. If you want to exclude these fields you can use the following code:

FieldInfo[] fields = data.GetType()
    .GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)
    .Where(f => f.GetCustomAttribute<CompilerGeneratedAttribute>() == null)
    .ToArray();