Iterating over the tupleof of a struct

[Suliman via Digitalmars-d-learn]

How can I feel struct with foreach loop?

struct ConfigStruct
{
     string [string] key1;
     string [string] key2;
}
ConfigStruct confstruct;

foreach (i, line; readText(ConfigName).splitLines())
{
string [] keyvalue = line.split("=");
confstruct.key1[keyvalue[0]] = keyvalue[1];
}

it's ok for 1 key, but I need iterate through all element of 
struct. For make it's simply let's assume that spited lines are 
equal йшер number of elements in struct.