[英]C# reflection. Target exception was unhandled
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);
}
我在這里收到異常:
v.GetType().GetProperty("CounterValue").SetValue(neCounters.GetType(), reader.GetValue(i), null);
這看起來很錯誤:
.SetValue(neCounters.GetType(), {whatever}, null);
這意味着您正在嘗試在Type
實例上分配它。 您應該在此處傳遞目標對象;如果它是static
屬性,則為null
。 看起來應該是這樣的:
.SetValue(neCounters, {whatever}, null);
但是使用起來會更容易:
neCounters.CounterValue = ...
// v.CounterValue = ... // <=== might be this instead - confusing context
如果這里有些復雜,也許可以通過dynamic
:
dynamic obj = neCounters;
// dynamic obj = v; // <=== might be this instead - confusing context
obj.CounterValue = reader.GetValue(i);
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