I'm trying to execute the CalculateGeometryAttributes geoprocessing tool with some hard-coded arguments. The code I have is working, but it's running on the entire feature class. I need it to only run on the selected records. Here is what I have now: //// Tool parameters string in_features = @"C:PathToFeatureClass" ; string geometry_property = "SEG_LEN LENGTH" ; string length_unit = "MILES_US" ; //// Path to tool using toolbox alias string tool_path = "management.CalculateGeometryAttributes" ; //// Construct the value array to be passed as parameter to ExecuteToolAsync var args = await QueuedTask . Run ( ( ) = > { // Create spatial reference and pass to value array constuctor var spatial_ref = SpatialReferenceBuilder . CreateSpatialReference ( 3081 ) ; return Geoprocessing . MakeValueArray ( in_features , geometry_property , length_unit , null , spatial_ref ) ; } ) ; //// Execute the tool with hard-coded args await Geoprocessing . ExecuteToolAsync ( tool_path , args ) ; I'm assuming I need to somehow check if any features are selected, then pass just those selected to the tool. Otherwise, it should run on all features. Any help is appreciated!

Hi Matt, I've been messing with this and this seems to work for me. Using the "Calculate GeometryAttributes_management" tool, I call the tool while I have features selected, and it updates the fields as specified in my 'args'. It seems like as long you have features selected, the GP Tool only processes the selected ones. See below: namespace GP_Test { internal class Button1 : Button { protected override void OnClick ( ) { QueuedTask . Run ( ( ) = > { //****Get the the VLS layer. var vlsLayer = MapView . Active . Map . FindLayers ( "GISWRKS1.WORKS.VLS_Points_FGDB" ) . First ( ) as BasicFeatureLayer ; //this is not necessary var selection = vlsLayer . GetSelection ( ) ; ArcGIS . Desktop . Framework . Dialogs . MessageBox . Show ( selection . GetCount ( ) . ToString ( ) ) ; //run the GP tool var args = Geoprocessing . MakeValueArray ( vlsLayer , "COMMENTS POINT_X" ) ; Geoprocessing . ExecuteToolAsync ( "CalculateGeometryAttributes_management" , args ) ; } ) ; } } }

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Need to get selected features for Geoprocessing.ExecuteToolAsync

MattWashburn1

I'm trying to execute the CalculateGeometryAttributes geoprocessing tool with some hard-coded arguments. The code I have is working, but it's running on the entire feature class. I need it to only run on the selected records. Here is what I have now:

<SPAN class="comment token">//// Tool parameters</SPAN>
<SPAN class="keyword token">string</SPAN> in_features <SPAN class="operator token">=</SPAN> <SPAN class="string token">@"C:PathToFeatureClass"</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">string</SPAN> geometry_property <SPAN class="operator token">=</SPAN> <SPAN class="string token">"SEG_LEN LENGTH"</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">string</SPAN> length_unit <SPAN class="operator token">=</SPAN> <SPAN class="string token">"MILES_US"</SPAN><SPAN class="punctuation token">;</SPAN>

<SPAN class="comment token">//// Path to tool using toolbox alias</SPAN>
<SPAN class="keyword token">string</SPAN> tool_path <SPAN class="operator token">=</SPAN> <SPAN class="string token">"management.CalculateGeometryAttributes"</SPAN><SPAN class="punctuation token">;</SPAN>

<SPAN class="comment token">//// Construct the value array to be passed as parameter to ExecuteToolAsync</SPAN>
<SPAN class="keyword token">var</SPAN> args <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">await</SPAN> QueuedTask<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Run</SPAN><SPAN class="punctuation token">(</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="comment token">// Create spatial reference and pass to value array constuctor </SPAN>
    <SPAN class="keyword token">var</SPAN> spatial_ref <SPAN class="operator token">=</SPAN> SpatialReferenceBuilder<SPAN class="punctuation token">.</SPAN><SPAN class="token function">CreateSpatialReference</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">3081</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
    <SPAN class="keyword token">return</SPAN> Geoprocessing<SPAN class="punctuation token">.</SPAN><SPAN class="token function">MakeValueArray</SPAN><SPAN class="punctuation token">(</SPAN>in_features<SPAN class="punctuation token">,</SPAN> geometry_property<SPAN class="punctuation token">,</SPAN> length_unit<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">null</SPAN><SPAN class="punctuation token">,</SPAN> spatial_ref<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="comment token">//// Execute the tool with hard-coded args</SPAN>
<SPAN class="keyword token">await</SPAN> Geoprocessing<SPAN class="punctuation token">.</SPAN><SPAN class="token function">ExecuteToolAsync</SPAN><SPAN class="punctuation token">(</SPAN>tool_path<SPAN class="punctuation token">,</SPAN> args<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>

I'm assuming I need to somehow check if any features are selected, then pass just those selected to the tool. Otherwise, it should run on all features.

Any help is appreciated!

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BrianBulla

Good to know....glad you got it working!

MattWashburn1

Ok, so why do things the easy way? This works, thank you!

I think I know what the problem was. Because this has to be run on the MCT, I was setting the OnClick() event to async and using "await" on Geoprocessing.ExecuteToolAsync(). That wasn't necessary, and prevented the tool from operating on the selection.

Thanks again!

BrianBulla

Hi Matt,

I've been messing with this and this seems to work for me. Using the "Calculate GeometryAttributes_management" tool, I call the tool while I have features selected, and it updates the fields as specified in my 'args'. It seems like as long you have features selected, the GP Tool only processes the selected ones.

See below:

<SPAN class="keyword token">namespace</SPAN> GP_Test
<SPAN class="punctuation token">{</SPAN>
    <SPAN class="keyword token">internal</SPAN> <SPAN class="keyword token">class</SPAN> <SPAN class="token class-name">Button1</SPAN> <SPAN class="punctuation token">:</SPAN> Button
    <SPAN class="punctuation token">{</SPAN>
        <SPAN class="keyword token">protected</SPAN> <SPAN class="keyword token">override</SPAN> <SPAN class="keyword token">void</SPAN> <SPAN class="token function">OnClick</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="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="comment token">//****Get the the VLS layer.</SPAN>
                <SPAN class="keyword token">var</SPAN> vlsLayer <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">FindLayers</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"GISWRKS1.WORKS.VLS_Points_FGDB"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">First</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">as</SPAN> BasicFeatureLayer<SPAN class="punctuation token">;</SPAN>

                <SPAN class="comment token">//this is not necessary</SPAN>
                <SPAN class="keyword token">var</SPAN> selection <SPAN class="operator token">=</SPAN> vlsLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">GetSelection</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>                                
                ArcGIS<SPAN class="punctuation token">.</SPAN>Desktop<SPAN class="punctuation token">.</SPAN>Framework<SPAN class="punctuation token">.</SPAN>Dialogs<SPAN class="punctuation token">.</SPAN>MessageBox<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Show</SPAN><SPAN class="punctuation token">(</SPAN>selection<SPAN class="punctuation token">.</SPAN><SPAN class="token function">GetCount</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">ToString</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

                <SPAN class="comment token">//run the GP tool</SPAN>
                <SPAN class="keyword token">var</SPAN> args <SPAN class="operator token">=</SPAN> Geoprocessing<SPAN class="punctuation token">.</SPAN><SPAN class="token function">MakeValueArray</SPAN><SPAN class="punctuation token">(</SPAN>vlsLayer<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"COMMENTS POINT_X"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>                
                Geoprocessing<SPAN class="punctuation token">.</SPAN><SPAN class="token function">ExecuteToolAsync</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"CalculateGeometryAttributes_management"</SPAN><SPAN class="punctuation token">,</SPAN> args<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>‍</SPAN><SPAN>‍</SPAN></SPAN>

MattWashburn1

Hi Brian,

I tried that, but no luck. The GP tool takes a Feature Layer object as the first parameter. The GetSelection() method returns a Selection-typed object which causes the GP tool to throw an exception.

Maybe there's a way to make a new Feature Layer in memory from the selection and run the tool on that. Problem there is that I would then need to somehow update the original feature class with the new values.

However...I'm new to C# and the arcgis pro sdk, to it's very likely that I'm missing something simple.

BrianBulla

Hi Matt,

Maybe I don't totally know what your doing, but if you start off with the features already being selected I wouldn't think you would need to set the definition query of the layer to. Can't you just run the GP Tool on the selected features??

Perhaps using in_features.GetSelection() might get you where you want to go.

I haven't done any coding use GP tools, so I could be totally wrong.

MattWashburn1

Thanks Brian! This worked to get the selection, then write it to a list and cast to an array.

I'm using the selected OIDs to set a Definition Query and then running the GP tool on the queried out layer. After it's done, I reset the original DefQuery if one existed:

<SPAN class="keyword token">protected</SPAN> <SPAN class="keyword token">async</SPAN> <SPAN class="keyword token">override</SPAN> <SPAN class="keyword token">void</SPAN> <SPAN class="token function">OnClick</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
  <SPAN class="punctuation token">{</SPAN>
    <SPAN class="comment token">//// TOOL PARAMETERS</SPAN>
    <SPAN class="keyword token">var</SPAN> in_features <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">FindLayers</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Roadways_Edits"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">First</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">as</SPAN> BasicFeatureLayer<SPAN class="punctuation token">;</SPAN>
    <SPAN class="keyword token">var</SPAN> currentDefQuery <SPAN class="operator token">=</SPAN> in_features<SPAN class="punctuation token">.</SPAN>DefinitionQuery<SPAN class="punctuation token">;</SPAN>
    <SPAN class="comment token">// Get selected OIDs and set Def Query based on selection </SPAN>
    <SPAN class="keyword token">await</SPAN> QueuedTask<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Run</SPAN><SPAN class="punctuation token">(</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">var</SPAN> getSelected <SPAN class="operator token">=</SPAN> in_features<SPAN class="punctuation token">.</SPAN><SPAN class="token function">GetSelection</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
        <SPAN class="keyword token">var</SPAN> selectionList <SPAN class="operator token">=</SPAN> in_features<SPAN class="punctuation token">.</SPAN><SPAN class="token function">GetSelection</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">GetObjectIDs</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">ToList</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
        <SPAN class="keyword token">string</SPAN> combinedString <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">string</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">Join</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">","</SPAN><SPAN class="punctuation token">,</SPAN> selectionList<SPAN class="punctuation token">.</SPAN><SPAN class="token function">ToArray</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
        in_features<SPAN class="punctuation token">.</SPAN><SPAN class="token function">SetDefinitionQuery</SPAN><SPAN class="punctuation token">(</SPAN>String<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Format</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"OBJECTID IN ({0})"</SPAN><SPAN class="punctuation token">,</SPAN> combinedString<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="keyword token">string</SPAN> geometry_property <SPAN class="operator token">=</SPAN> <SPAN class="string token">"SEG_LEN LENGTH"</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="comment token">//this is ["SEG_LEN", "LENGTH"]</SPAN>
    <SPAN class="keyword token">string</SPAN> length_unit <SPAN class="operator token">=</SPAN> <SPAN class="string token">"MILES_US"</SPAN><SPAN class="punctuation token">;</SPAN>

    <SPAN class="comment token">//// PATH TO TOOL USING TOOLBOX ALIAS</SPAN>
    <SPAN class="keyword token">string</SPAN> tool_path <SPAN class="operator token">=</SPAN> <SPAN class="string token">"management.CalculateGeometryAttributes"</SPAN><SPAN class="punctuation token">;</SPAN>

    <SPAN class="comment token">//// CONSTRUCT THE VALUE ARRAY </SPAN>
    <SPAN class="keyword token">var</SPAN> args <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">await</SPAN> QueuedTask<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Run</SPAN><SPAN class="punctuation token">(</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="comment token">// Create spatial reference and pass to value array constuctor </SPAN>
        <SPAN class="keyword token">var</SPAN> spatial_ref <SPAN class="operator token">=</SPAN> SpatialReferenceBuilder<SPAN class="punctuation token">.</SPAN><SPAN class="token function">CreateSpatialReference</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">3081</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
        <SPAN class="keyword token">return</SPAN> Geoprocessing<SPAN class="punctuation token">.</SPAN><SPAN class="token function">MakeValueArray</SPAN><SPAN class="punctuation token">(</SPAN>in_features<SPAN class="punctuation token">,</SPAN> geometry_property<SPAN class="punctuation token">,</SPAN> length_unit<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">null</SPAN><SPAN class="punctuation token">,</SPAN> spatial_ref<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="comment token">//// RUN GP TOOL ASYNC</SPAN>
    <SPAN class="keyword token">await</SPAN> Geoprocessing<SPAN class="punctuation token">.</SPAN><SPAN class="token function">ExecuteToolAsync</SPAN><SPAN class="punctuation token">(</SPAN>tool_path<SPAN class="punctuation token">,</SPAN> args<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

    <SPAN class="comment token">//// RESET DEF QUERY</SPAN>
    <SPAN class="keyword token">await</SPAN> QueuedTask<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Run</SPAN><SPAN class="punctuation token">(</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>
        in_features<SPAN class="punctuation token">.</SPAN><SPAN class="token function">SetDefinitionQuery</SPAN><SPAN class="punctuation token">(</SPAN>currentDefQuery<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>
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This method works, but seems a bit clunky. One issue I'm seeing is that the DefQuery persists in the FeatureLayer options menu.

Is there another way to run this tool on the selected OIDs without a setting a Definition Query?

BrianBulla

There's different ways to do this. If this is for a specific layer, you could try something like this...

Get the selected features:

                <SPAN class="comment token">//****Get all of the selected ObjectIDs from the VLS layer.</SPAN>
                <SPAN class="keyword token">var</SPAN> vlsLayer <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">FindLayers</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"GISWRKS1.WORKS.VLS_Points"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">First</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">as</SPAN> BasicFeatureLayer<SPAN class="punctuation token">;</SPAN>
                <SPAN class="keyword token">var</SPAN> selection <SPAN class="operator token">=</SPAN> vlsLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">GetSelection</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
                IReadOnlyList<SPAN class="operator token"><</SPAN><SPAN class="keyword token">long</SPAN><SPAN class="operator token">></SPAN> selectedOIDs <SPAN class="operator token">=</SPAN> selection<SPAN class="punctuation token">.</SPAN><SPAN class="token function">GetObjectIDs</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>  <SPAN class="comment token">//save the selected OBJECTIDs to a list.</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Then process them:

                    <SPAN class="keyword token">foreach</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">var</SPAN> oid <SPAN class="keyword token">in</SPAN> selectedOIDs<SPAN class="punctuation token">)</SPAN>
                    <SPAN class="punctuation token">{</SPAN>
                        <SPAN class="comment token">//do something</SPAN>
                    <SPAN class="punctuation token">}</SPAN>
‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

To check for the number of selected features:

vlsLayer<SPAN class="punctuation token">.</SPAN>SelectionCount<SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

Nimm an der Unterhaltung teil

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