get a list of single property values in c# - reflection

Question

I am struggling to understand how a reflection works in C#. I set a property of class name. When I use a method (below) to validate, i need to get a list of ProductName values. How to do this?

public class Product
{
    public string ProductName
    {
        get;
        set;
    }
}

public class ClassName
 {
    public List<Product> Products
    {
        get;
        set;
    }
 }

App:

product.Add(new Product { ProductName = "whatever name 1" });
product.Add(new Product { ProductName = "whatever name 2" });

Method:

public bool Validate(object obj)
{
        PropertyInfo property = typeof(ClassName).GetProperty("Products");

        Value = (string)property.GetValue(obj, null); // how to get a list of values 
}

Have you tried casting it to list?(List<Product>)property.GetValue(obj, null); — Yevgeniy.Chernobrivets
– Yevgeniy.Chernobrivets, Commented Nov 26, 2013 at 10:37
Although, it is able to decipher your question... Alex is right, you should at least take the time to read your own question and make sure all the keywords are correct (i.e product/Products as well as Product/GenericTransaction) — Sayse
– Sayse, Commented Nov 26, 2013 at 10:41

King King · Accepted Answer · 2013-11-26 10:53:12Z

1

You have to cast it to List<Product>:

public bool Validate(object obj) {
  if(!(obj is ClassName)) return false;
  PropertyInfo property = typeof(ClassName).GetProperty("Products");  
  Value = (List<Product>)property.GetValue(obj, null);
  return true;//or your own validation implemented here
}

edited Nov 26, 2013 at 10:53

answered Nov 26, 2013 at 10:37

King King

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3 Comments

user2857908 Over a year ago

i have tried this but i get error message : Object does not match target type.What is a Value data type?

King King Over a year ago

@user2857908 are you sure obj is of type ClassName, that's your fault.

King King Over a year ago

@user2857908 I updated the Validate method as how it should be, now you should see there is not any exception but the Validate returns false, because the obj passed in is not of type ClassName.

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