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<h1><a name="kanchor20"></a>SODA Sorting</h1>
<p>You can specify to sort by certain fields in SODA. For this you need to descend to the field and use the appropriate order ascending or order descending method.</p>
<p>In cases where this is not enough, you can use a special comparator.</p>
<h2><a name="SortByField"></a> Sorting by Field</h2>
<p>To sort by a field navigate to the field and call a order ascending or descending method. Note that this only works for fields which have natural sortable values, such as strings and numbers.</p>
<div class="codesnippet" MadCap:conditions="Primary.c#">
<pre class="prettyprint" xml:space="preserve">IQuery query = container.Query();
query.Constrain(typeof(Pilot));
query.Descend("name").OrderAscending();
IObjectSet result = query.Execute();</pre>
<div class="codesnippet-meta">SodaSorting.cs: Order by a field
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<div class="codesnippet" MadCap:conditions="Primary.VB.NET">
<pre class="prettyprint lang-vb" MadCap:conditions="Primary.Online" xml:space="preserve">Dim query As IQuery = container.Query()
query.Constrain(GetType(Pilot))
query.Descend("name").OrderAscending()
Dim result As IObjectSet = query.Execute()</pre>
<div class="codesnippet-meta">SodaSorting.vb: Order by a field
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<h2><a name="SortByMultipleFields"></a>Sort by Multiple Fields</h2>
<p>You can sort by multiple fields. Add a order constrain for each field. The first order statement has the highest priority and last added the lowest.</p>
<div class="codesnippet" MadCap:conditions="Primary.c#">
<pre class="prettyprint" xml:space="preserve">IQuery query = container.Query();
query.Constrain(typeof(Pilot));
query.Descend("age").OrderAscending();
query.Descend("name").OrderAscending();
IObjectSet result = query.Execute();</pre>
<div class="codesnippet-meta">SodaSorting.cs: Order by multiple fields
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<div class="codesnippet" MadCap:conditions="Primary.VB.NET">
<pre class="prettyprint lang-vb" MadCap:conditions="Primary.Online" xml:space="preserve">Dim query As IQuery = container.Query()
query.Constrain(GetType(Pilot))
query.Descend("age").OrderAscending()
query.Descend("name").OrderAscending()
Dim result As IObjectSet = query.Execute()</pre>
<div class="codesnippet-meta">SodaSorting.vb: Order by multiple fields
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<h2><a name="CostumSorting"></a>Sort With Your Own Comperator</h2>
<p>In cases where you have more complex sorting requirements, you can specify your own comparator. It is used like a regular <span class="PrimaryPlattform">.NET</span>-comparator. </p>
<div class="codesnippet" MadCap:conditions="Primary.c#">
<pre class="prettyprint" xml:space="preserve">IQuery query = container.Query();
query.Constrain(typeof(Pilot));
query.SortBy(new NameLengthComperator());
IObjectSet result = query.Execute();</pre>
<div class="codesnippet-meta">SodaSorting.cs: Order by your comparator
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<div class="codesnippet" MadCap:conditions="Primary.VB.NET">
<pre class="prettyprint lang-vb" MadCap:conditions="Primary.Online" xml:space="preserve">Dim query As IQuery = container.Query()
query.Constrain(GetType(Pilot))
query.SortBy(New NameLengthComperator())
Dim result As IObjectSet = query.Execute()</pre>
<div class="codesnippet-meta">SodaSorting.vb: Order by your comparator
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<div class="codesnippet" MadCap:conditions="Primary.c#">
<pre class="prettyprint" xml:space="preserve">class NameLengthComperator :IQueryComparator
{
public int Compare(object first, object second)
{
Pilot p1 = (Pilot) first;
Pilot p2 = (Pilot)second;
// sort by string-length
return Math.Sign(p1.Name.Length - p2.Name.Length);
}
}</pre>
<div class="codesnippet-meta">SodaSorting.cs: The string length comperator
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<div class="codesnippet" MadCap:conditions="Primary.VB.NET">
<pre class="prettyprint lang-vb" MadCap:conditions="Primary.Online" xml:space="preserve">Private Class NameLengthComperator
Implements IQueryComparator
Public Function Compare(ByVal first As Object, ByVal second As Object) As Integer _
Implements IQueryComparator.Compare
Dim p1 As Pilot = DirectCast(first, Pilot)
Dim p2 As Pilot = DirectCast(second, Pilot)
' sort by string-length
Return Math.Sign(p1.Name.Length - p2.Name.Length)
End Function
End Class</pre>
<div class="codesnippet-meta">SodaSorting.vb: The string length comperator
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