How to refresh a CIMLegendItem?

LesleyBross1

I am using the Layer.ReplaceDataSource() to swap out the data source on a raster layer. This is a continuous raster. I also update the raster layer name. However, the legendItem associated with that layer does not completely update. The name changes to the new layer name, but the min and max values for the layer in the legend retain their original values. Is there a way to force this to update?

UmaHarano

Hi Lesley

When you change the underlying datasource for a raster (or any feature layer for that matter), you will have also change the Colorizer (Change the renderer for a feature layer). This will update the Legend in the TOC. So it is a 2 step process:

1. Change the datasource using the ReplaceDataSource method.

2. Then apply the colorizer suitable for the new data.

This is the code snippet I used:

<SPAN class="keyword token">var</SPAN> rasterLayer <SPAN class="operator token">=</SPAN> MapView<SPAN class="punctuation token">.</SPAN>Active<SPAN class="punctuation token">.</SPAN>Map<SPAN class="punctuation token">.</SPAN><SPAN class="token function">GetLayersAsFlattenedList</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN>OfType<SPAN class="operator token"><</SPAN>RasterLayer<SPAN class="operator token">></SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">FirstOrDefault</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
QueuedTask<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Run</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">async</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">=</SPAN><SPAN class="operator token">></SPAN> <SPAN class="punctuation token">{</SPAN>
        <SPAN class="keyword token">using</SPAN> <SPAN class="punctuation token">(</SPAN>Geodatabase geodatabase <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Geodatabase</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">FileGeodatabaseConnectionPath</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Uri</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">@"\\Path-to-Data\raster.gdb"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
        <SPAN class="punctuation token">{</SPAN>
          <SPAN class="keyword token">using</SPAN> <SPAN class="punctuation token">(</SPAN>Dataset dataset <SPAN class="operator token">=</SPAN> geodatabase<SPAN class="punctuation token">.</SPAN>OpenDataset<SPAN class="operator token"><</SPAN>RasterDataset<SPAN class="operator token">></SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"elevation"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
          <SPAN class="punctuation token">{</SPAN>
            rasterLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">ReplaceDataSource</SPAN><SPAN class="punctuation token">(</SPAN>dataset<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

            <SPAN class="comment token">// Check if the Stretch colorizer can be applied to the raster layer.</SPAN>
            <SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>rasterLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">GetApplicableColorizers</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">Contains</SPAN><SPAN class="punctuation token">(</SPAN>RasterColorizerType<SPAN class="punctuation token">.</SPAN>StretchColorizer<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
            <SPAN class="punctuation token">{</SPAN>
              <SPAN class="comment token">// Create a new Stretch Colorizer Definition using the default constructor.</SPAN>
              StretchColorizerDefinition stretchColorizerDef_default <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">StretchColorizerDefinition</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
              <SPAN class="comment token">// Create a new Stretch colorizer using the colorizer definition created above.</SPAN>
              CIMRasterStretchColorizer newStretchColorizer_default <SPAN class="operator token">=</SPAN>
                <SPAN class="keyword token">await</SPAN> rasterLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">CreateColorizerAsync</SPAN><SPAN class="punctuation token">(</SPAN>stretchColorizerDef_default<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">as</SPAN> CIMRasterStretchColorizer<SPAN class="punctuation token">;</SPAN>
              <SPAN class="comment token">// Set the new colorizer on the raster layer.</SPAN>
              rasterLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">SetColorizer</SPAN><SPAN class="punctuation token">(</SPAN>newStretchColorizer_default<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
            <SPAN class="punctuation token">}</SPAN>
          <SPAN class="punctuation token">}</SPAN>       
        <SPAN class="punctuation token">}</SPAN>
      <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>