如何使用带有反射的调用来获取ref参数

Question

How can take ref parameter(OutputData) using Invoke with Reflection. objectValues is an object array that take an parameters is sending parameter to "FM_DEC_ENC" Method.This method contains 8 parameter. One of them is outputData re parameter

 mInfo.Invoke("FM_DEC_ENC", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance,
                 null, objectValues,null)

---

public Int32 FM_DEC_ENC(String AdapterID, String SlotID, String InputData, 
        String DecKeyName, String EncKeyName, HsmCommConstants.ENCRIPTION DecEcbOrCbc,
        HsmCommConstants.ENCRIPTION EncEcbOrCbc, ref String OutputData)

Answer 1

You are already doing it correctly by keeping a reference to the parameter array. When the method returns, the result will be in objectValues[7] .

Note that this won't work if FM_DEC_ENC is a native method that expects a modifiable buffer as OutputData (because System.String cannot be modified). In this case, you can also specify StringBuilder as parameter type .