How to get the Map Service ID programmatically?
How do I get the Map Service ID programmatically? I really don't want to hard code this value. I have the Layer Name and it's corresponding ArcGIS REST endpoint. Ultimately what I'd like to do is use the SelectFeatures activity using Map Service ID and Layer Name as inputs. Thanks in advance.
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Hi Andrew, since you mentioned "SelectFeatures" activity rather than "ShowResults", I'm assuming this is for Essentials (xaml) Workflow?
In Essentials Workflow, I don't believe there's a "clean" way to get the site or map information and determine a map service based on a layer name. I know at least one "messy" way to do it by downloading the site's "map" REST endpoint as json with DownloadString, and making careful use of GetJSONValue or other activities for parsing the REST endpoint's JSON. I believe GetJsonValue will get a map service id when using an expression like
String.Format("$.mapServices[?(@..displayName =='{0}')].id","MyLayerName")
but I'm not sure if that accounts for the possibility of group layers, and I know it won't handle scenarios where two layers share a name.
Generally the map service ID is a pretty reliable value that won't change unless you remove a map service from a site and then re-add it later. It's pretty safe to either hard-code it, or provide it through an argument. It's layer IDs that tend to be less reliable and frequently change when you add/remove/reorder the layers in a map service.
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We have been using Amanda's approach in many workflows, and we haven't found any downsides to it.
However, if you don't like it, here's an alternative approach: Add a custom property with a unique name to the layer, and use GetLayerInfoByProperty to get the layer. The result will contain the Mapservice ID and the Layer ID.
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Thanks Amanda and Berend! I will try both and see how if I can get the Mapservice ID. Worse comes to worse I can just hardcode it.
Cheers
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