foreach如何改成for语句

foreach怎么改成for语句
double   mapScale;      
foreach(LayerConfig   lc   in   MOHelper.getInstance().GetLayerConfigs())
{
mapScale   =   lc.MapScale;
}怎么改成for语句

[解决办法]
double mapScale;
for(int i = 0; i < MOHelper.getInstance().GetLayerConfigs().Count; i++)
{
mapScale += lc.MapScale;
}
[解决办法]
double mapScale;
for(int i= 0 ； i < MOHelper.getInstance().GetLayerConfigs().count ; i++)
{
mapScale = MOHelper.getInstance().GetLayerConfigs()[i].MapScale;
}