Maps and MapEnumerators

Dynamics AX, Dynamics AX 2009, , , , , , ,

This code put five records of the table CustTable in a map with the key AccountNum. Then the map is looped and the and AccountNum and customer Name is printed to the infolog.

The last part of the code finds the last AccountNum from from the loop directly from the Map, but after a check is done if the value is in the map. Performing a lookup for a value that doesn´t exist in map will result in a error.

One important thing to remember here, you should always use a unique key to the map, otherwise you will not be able to find specific records in a fast and orderly manner. In this case I use AccontNum which is a unique identifier for the CustTable table. If you don´t have a unique key, you can use the RecId field.

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static void EP_Maps(Args _args)
{
    Map         foundInvoiceMap = new Map(
                Types::String, Types::Record);
    MapEnumerator   enumerator;
    CustTable   custTable;
    CustAccount account;
    int         i = 1;
    ;
 
    while select custTable
    {
        i++;
 
        foundInvoiceMap.insert(
        custTable.AccountNum, custTable);
 
        if(i > 5)
            break;
    }
 
    enumerator = foundInvoiceMap.getEnumerator();
 
    while(enumerator.moveNext())
    {
        account     = enumerator.currentKey();
        custTable   = enumerator.currentValue();
 
        info(account + " " + custTable.Name);
    }
 
    custTable = null;
 
    if(foundInvoiceMap.exists(account))
    {
        custTable = foundInvoiceMap.lookup(account);
        info(custTable.AccountNum + " " + custTable.Name);
    }
}

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