CODEWITHSUNDEEP
c#genericsruntime
Ivan Pericic
Ivan Pericic

Reputation: 520

C# How to get properties value of generic class at runtime

How to get value and type of "strx" at runtime? Cant get value of cell (properties) at runtime when using generics (as result of under code is "null").

Example

   public class Foo 
    {
        public int x, y;
        public string strx, stry;
    }

    public void GetCellValueByName<T>(GridView gridview, string name/)
    {
        T = (T)Activator.CreateInstance(typeof(T));

        object row = gridview.GetRow(gridview.GetSelectedRows()[0]);

        if (row != null && row is T) 
        {
            columnType = (T)gridview.GetRow(gridview.GetSelectedRows()[0]);
            PropertyInfo info = columnType.GetType().GetProperty(name);
            if (info != null) 
            {  // Here I got always null
                info.GetValue(columnType, null);
            }
        }
    }

string valueOfStrx = GetCellValueByName<Foo>(grid, "strx");

Upvotes: 0

Views: 4744

Answers (1)

Markus
Markus

Reputation: 22501

The problem is that in class Foo, strx is a field (member variable):

public string strx, stry;

In your method, you try to use GetProperty, but this will not find the field: 

PropertyInfo info = columnType.GetType().GetProperty(name);

So either change the member to a property 

public string strx { get; set; }
public string stry { get; set; }

or use GetField instead: 

FieldInfo info = columnType.GetType().GetField(name);
// ...
info.GetValue(columnType); // Note that GetValue for a field does not take a second parameter

Upvotes: 1

Related Questions