如何通过Marshal.GetFunctionPointerForDelegate获取函数指针？

工作中遇到这样一个问题，需要在c#托管代码中，调用函数指针。我在类中添加了一个自定义方法makerClick和一个委托ClickDeleage。
public delegate bool ClickDeleage();//单击标注委托对象
public bool makerClick() //单击标准事件
{
string currPosdes = ""; //当前位置兴趣点描述
MLonLat currMakerLonlat = new MLonLat();
currMakerLonlat.fLon = float.Parse(currPosition.Longitude.ToString());
currMakerLonlat.fLat = float.Parse(currMakerLonlat.fLat.ToString());
MREGEOCODESEARCHOPTIONS Option = new MREGEOCODESEARCHOPTIONS();
MReGeocodeSearchResult result = this.mapCtrl1.HttpPoiToAddress(currMakerLonlat, Option);
if (result == null)
{
currPosdes = ""; //为获取到该位置附近的兴趣点信息。
}
if (result.lNumOfRoundPoi == 1)
{
currPosdes = result.pRoundPois[0].cName;
}
if (result.lNumOfRoundPoi > 1)
{
currPosdes = nearestFind(result.pRoundPois, FromGpsToLonlat(currPosition)).cName;
}

StringBuilder makerText = new StringBuilder();
makerText.Append("当前经度:" + currPosition.Longitude.ToString());
makerText.Append("当前纬度:" + currPosition.Latitude.ToString());
makerText.Append("当前位置信息:" + currPosdes);
notification1.Caption = "当前位置信息";
notification1.Visible = true;
notification1.Text = makerText.ToString();

return true;
}


通过上边的委托和函数来获取指针，以下是我获取函数指针的过程：
makerClickdelegate mydelegate=new makerClickdelegate(makerClick);
IntPtr functionPointer = Marshal.GetFunctionPointerForDelegate(mydelegate);

可这样确报了一个NotSupportedException的错误，目标平台是mobile5.大家帮忙看看，谢谢。