System.Reflection.FieldInfo.GetValue C# (CSharp) Method

        public abstract Object GetValue(Object obj);
        public virtual Object GetRawConstantValue() { throw new NotSupportedException(Environment.GetResourceString("NotSupported_AbstractNonCLS")); }

 private void ConstructField(FieldInfo fieldInfo)
 {
     string valueStr = null;
     if (fieldInfo.FieldType.IsArray)
     {
         var arrayBuilder = new StringBuilder();
         arrayBuilder.Append("[");
         var arr = fieldInfo.GetValue(Obj) as Array;
         foreach (var element in arr)
         {
             arrayBuilder.Append(string.Format("{0}, ", ConstructValue(element)));
         }
         arrayBuilder.Remove(arrayBuilder.Length - 2, 2);
         arrayBuilder.Append("]");
         valueStr = arrayBuilder.ToString();
     }
     else
     {
         valueStr = ConstructValue(fieldInfo.GetValue(Obj));
     }
     if (valueStr == null)
     {
         throw new Exception("Unsupported data type");
     }
     builder.Append(string.Format("\"{0}\": {1},\n", fieldInfo.Name, valueStr));
 }