Best way to iterate Dictionary> in NVelocity

Question

I have a C# Dictionary<string, Dictionary<string, object>>, and I am trying to display the data with nVelocity template and also I am trying to get the keys of the dictionary with an index. I am newbie.

Please help me with how to access keys with an index e.g. I want to access key at 0 index and also how can I display data with iterations and how do we put "break" statements in foreach loops?

    <table width="100%" border="0" cellpadding="0" cellspacing="0">
    <tbody>
        <tr class="HeaderOne">
            <td align="left">Class</td>

            #foreach($services in $VolumeSummary)
                #foreach($item in $VolumeSummary[$services])
                    <td class="numeric-th">$item.AverageUnitPriceF</td>
                #end
                #break
            #end
            <td class="numeric-th">Average Price</td>
            <td class="numeric-th">Total</td>
        </tr>

        #foreach ($item in $TotalsByServiceAndTermYear)
        <tr style="color:#333;font-weight:normal;">
            <td>$item.Service</td>
            <td class="numeric-td">
                $!item.Year
            </td>
            <td class="numeric-td">
                $!item.AverageUnitPriceF
            </td>
            <td class="numeric-td">
                $!item.TotalPriceF
            </td>
        </tr>
        #end
    </tbody>
</table>

I have no clue on NVelocity, but a `Dictionary` is not ordered and thus has no real index you can access to get the first key. — MakePeaceGreatAgain, Nov 30 '16 at 12:02
Sure, but this isn´t deterministic, in particular it may change in a newer .NET-version. — MakePeaceGreatAgain, Nov 30 '16 at 12:25

score 1 · Accepted Answer · edited Oct 13 '17 at 19:41

1

NVelocity just sits over the .NET objects so you can't get a item by index from a dictionary, but you can use $dict.get_Item("key") to get an item by key, which is the syntax for indexers as that is the underlying CLR method for the item indexer.

As others have mentioned a Dictionary has a non-deterministic sort order, consider using a SortedDictionary.

You can break from a #foreach using the #break directive, like your example. It was implemented in 2011 after we released v1.1.1, so you'll have to build from master or get a master build from our build server, otherwise you can workaround it by using a conditional to hide the contents.

#foreach($item in $dict)
  $item.Key
  #break
#end

#foreach($item in $dict)
  #if($velocityCount == 1)
    $item.Key
  #end
#end

edited Oct 13 '17 at 19:41

Peter Mortensen

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answered Nov 30 '16 at 15:58

Jonathon Rossi

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#break isn't working... it gets displayed as it is... any reason? – Muhammad Jahanzeb Dec 01 '16 at 05:54
@MuhammadZaib did you read my comment about the version number? – Jonathon Rossi Dec 01 '16 at 06:42
@MuhammadZaib glad that it worked, see http://stackoverflow.com/help/someone-answers – Jonathon Rossi Dec 06 '16 at 14:16

Best way to iterate Dictionary> in NVelocity

1 Answers1