DynamicMapService Refresh Leaking Memory

DougCollins — Thu, 21 Oct 2010 17:12:06 GMT

We have found that a "Refresh" on an ArcGISDynamicMapServiceLayer causes a memory leak. The memory consumed by the browser continues to grow each time the layer is refreshed. This is a real problem when you are trying to monitor changes such as location or attributes for a particular layer. The only way we have found to release the memory is to close the browser and start over, which is unacceptable to our users.

Here is some sample code that has a button to refresh a dynamic map layer from arcgisonline. Each time you click refresh the memory grows.

XAML code below:
<UserControl x:Class="MemoryTest.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:sys="clr-namespace:System;assembly=mscorlib"
    xmlns:esri="http://schemas.esri.com/arcgis/client/2009"
    mc:Ignorable="d"
    d:DesignHeight="500" d:DesignWidth="700">

    <Grid x:Name="LayoutRoot" Background="White">

        <Grid.RowDefinitions>
            <RowDefinition Height="30" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>

        <esri:Map x:Name="MyMap" Grid.Row="1" >

            
            <esri:ArcGISTiledMapServiceLayer ID="StreetMapLayer"
                  Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer" />

            
            <esri:ArcGISDynamicMapServiceLayer ID="DynamicLayer"
                    Url="http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Fire/Sheep/MapServer" DisableClientCaching="True" />

        </esri:Map>

        
        <TextBox x:Name="Status" Width="400" Height="28" Grid.Row="0" HorizontalAlignment="Left" VerticalAlignment="Center" />

        
        <Button x:Name="RefreshBtn" Content="Refresh" Width="60" Height="20" Grid.Row="0" HorizontalAlignment="Right" VerticalAlignment="Center" Click="RefreshBtn_Click" />

    </Grid>
</UserControl>

C# Code Behind:
namespace MemoryTest
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }

        // Code to execute when the Refresh button is clicked.
        private void RefreshBtn_Click(object sender, RoutedEventArgs e)
        {
            string msg;
            try
            {
                string serviceName = "DynamicLayer";
                ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer dynamicServiceLayer = MyMap.Layers[serviceName] as
                            ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer;

                // Refresh the DynamicLayer - THIS is where the MEMORY LEAK occurs!!!
                dynamicServiceLayer.Refresh();

                msg = "PointLayer Refreshed at: ";
            }
            catch (Exception ex)
            {
                msg = ex.Message;
            }

            string timeStr = DateTime.Now.ToLocalTime().ToLongTimeString();
            Status.Text = msg + timeStr;
        }
    }
}

---
Is there something we need to do to release the memory each time the layer is refreshed?
Are we doing something wrong here, or is this a real bug?
Has anyone else seen this?

Thanks, we are anxious to get this resolved!

Charlie

Re: DynamicMapService Refresh Leaking Memory

NoneNone — Thu, 22 Sep 2011 08:04:51 GMT

Same issue here. Is that a bug? How do we release memory with dynamic and feauture layers?

Re: DynamicMapService Refresh Leaking Memory

JenniferNery — Thu, 29 Sep 2011 17:50:12 GMT

Thank you for your feedback. We are looking into getting this fixed in future releases.

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