Method PopulateFromServiceAsync
PopulateFromServiceAsync(QueryParameters, Boolean, IEnumerable<String>)
Asynchronously populates the OGC API - Features feature collection table with the results of a query.
Declaration
public Task<FeatureQueryResult> PopulateFromServiceAsync(QueryParameters parameters, bool clearCache, IEnumerable<string> outFields)Parameters
| Type | Name | Description |
|---|---|---|
| QueryParameters | parameters | The QueryParameters used to filter feature results. |
| System.Boolean | clearCache | A value indicating whether to clear existing table data before loading new results. If |
| System.Collections.Generic.IEnumerable<System.String> | outFields | The optional list of attribute fields to include in the result. |
Returns
| Type | Description |
|---|---|
| System.Threading.Tasks.Task<FeatureQueryResult> | A System.Threading.Tasks.Task that represents the asynchronous populate from service operation. The value of the task result is a FeatureQueryResult object. |
Remarks
Use the default (empty) QueryParameters to get all features from a service.
Specifying null or an empty enumerable for outFields will result in the
default set of outfields being used. Spatial queries (those that set
Geometry) must use Intersects.
Applies to
Platforms and versions
| Target | Versions |
|---|---|
| .NET Standard 2.0 | 100.10 - 200.6 |
| .NET | 100.13 - 200.6 |
| .NET Windows | 100.13 - 200.6 |
| .NET Android | 200.2 - 200.6 |
| .NET iOS | 200.0 - 200.6 |
| .NET Framework | 100.10 - 200.6 |
| Xamarin.Android | 100.10 - 100.14 |
| Xamarin.iOS | 100.10 - 100.15 |
| UWP | 100.10 - 200.6 |
PopulateFromServiceAsync(QueryParameters, Boolean, IEnumerable<String>, CancellationToken)
Asynchronously populates the table using a query.
Declaration
public async Task<FeatureQueryResult> PopulateFromServiceAsync(QueryParameters parameters, bool clearCache, IEnumerable<string> outFields, CancellationToken cancellationToken)Parameters
| Type | Name | Description |
|---|---|---|
| QueryParameters | parameters | The QueryParameters used to filter feature results. |
| System.Boolean | clearCache | A value indicating whether to clear existing table data before loading new results. |
| System.Collections.Generic.IEnumerable<System.String> | outFields | The optional list of attribute fields to include in the result. |
| System.Threading.CancellationToken | cancellationToken | A cancellation token that can be used by other objects or threads to receive notice of cancellation. |
Returns
| Type | Description |
|---|---|
| System.Threading.Tasks.Task<FeatureQueryResult> | A System.Threading.Tasks.Task that represents the asynchronous populate from service operation. The value of the task result is a FeatureQueryResult object. |
Remarks
Use the default (empty) QueryParameters to get all features from a service.
Specifying null or an empty enumerable for outFields will result in the default set of outfields being used.
Spatial queries (those that set Geometry) must use Intersects.
Applies to
Platforms and versions
| Target | Versions |
|---|---|
| .NET Standard 2.0 | 100.10 - 200.6 |
| .NET | 100.13 - 200.6 |
| .NET Windows | 100.13 - 200.6 |
| .NET Android | 200.2 - 200.6 |
| .NET iOS | 200.0 - 200.6 |
| .NET Framework | 100.10 - 200.6 |
| Xamarin.Android | 100.10 - 100.14 |
| Xamarin.iOS | 100.10 - 100.15 |
| UWP | 100.10 - 200.6 |
PopulateFromServiceAsync(QueryParameters, Boolean, IEnumerable<String>, String, CancellationToken)
Populate the OGC API - Features feature collection table with the results of a query.
Declaration
public async Task<FeatureQueryResult> PopulateFromServiceAsync(QueryParameters parameters, bool clearCache, IEnumerable<string> outFields, string queryLanguage, CancellationToken cancellationToken = default(CancellationToken))Parameters
| Type | Name | Description |
|---|---|---|
| QueryParameters | parameters | Parameters that define how features are returned from the service. |
| System.Boolean | clearCache | If |
| System.Collections.Generic.IEnumerable<System.String> | outFields | An optional list of attribute fields to include in the result. |
| System.String | queryLanguage | The query language that the WhereClause is written in. |
| System.Threading.CancellationToken | cancellationToken | An optional cancellation token that can be used by other objects or threads to receive notice of cancellation. |
Returns
| Type | Description |
|---|---|
| System.Threading.Tasks.Task<FeatureQueryResult> | A System.Threading.Tasks.Task that represents the asynchronous populate from service operation. The value of the task result is a FeatureQueryResult object. |
Remarks
Populates the null or an empty enumerable for outFields will result in the default set
of outfields being used. Spatial queries (those that specify geometries) must use the Intersects spatial
relationship.
Some OGC feature sources allow for query expressions to be written in different languages. The
queryLanguage parameter allows you to explicitly specify the language of the
WhereClause for the OGC feature query. The value of this parameter may be
'CQL2-TEXT', 'CQL2-JSON', or any other language supported by the target server. For OGC feature services the
default language is CQL2-TEXT. For more information, refer to the OGC specification
OGC API - Features - Part3. The
default value is an empty string, indicating that the WhereClause uses the
default language for the source.
Applies to
Platforms and versions
| Target | Versions |
|---|---|
| .NET Standard 2.0 | 200.6 |
| .NET | 200.6 |
| .NET Windows | 200.6 |
| .NET Android | 200.6 |
| .NET iOS | 200.6 |
| .NET Framework | 200.6 |
| UWP | 200.6 |