C＃反射。 目标异常未处理

Question

NetworkElementCountersFactory factory=new NetworkElementCountersFactory();
List<NetworkElementCounters> neCountersList= new List<NetworkElementCounters>();
NetworkElementCounters neCounters;
while (reader.Read())
{
    i = 4;
    neCounters = factory.getInstance(tableName, reader.GetInt32(0), reader.GetDateTime(1), reader.GetDateTime(2), reader.GetInt32(3));
    foreach (var v in neCounters.Fields)
    {
        v.GetType().GetProperty("CounterValue").SetValue(neCounters.GetType(), reader.GetValue(i), null);
        i++;
    }
    neCountersList.Add(neCounters);
} 

I receive the exception here:

v.GetType().GetProperty("CounterValue").SetValue(neCounters.GetType(), reader.GetValue(i), null);

Answer 1

This looks very wrong:

.SetValue(neCounters.GetType(), {whatever}, null);

That means you are trying to assign this on a Type instance. You should be passing the target object here, or null if it is a static property. It looks like this should be:

.SetValue(neCounters, {whatever}, null);

but then it would be easier to use:

neCounters.CounterValue = ...
// v.CounterValue = ... // <=== might be this instead - confusing context

maybe via dynamic if there is some complexity here:

dynamic obj = neCounters;
// dynamic obj = v; // <=== might be this instead - confusing context
obj.CounterValue = reader.GetValue(i);