Method PopulateFromServiceAsync
PopulateFromServiceAsync(QueryParameters, Boolean, IEnumerable<String>)
Asynchronously populates the table using 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 attribute fields to include in the result. |
Returns
| Type | Description |
|---|---|
| System.Threading.Tasks.Task<FeatureQueryResult> | A 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 the service.
Specifying null or an empty System.Collections.Generic.IEnumerable<T> for outFields
will result in the default set of outfields being used. WFS is only compatible with a subset
of possible queries defined by QueryParameters. Where clause only works when the
table is backed by a service powered by GeoServer. Spatial queries (those that set
Geometry) must use Intersects.
Applies to
Platforms and versions
| Target | Versions |
|---|---|
| .NET Standard 2.0 | 100.5 - 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 | 100.5 - 200.6 |
| Xamarin.Android | 100.5 - 100.14 |
| Xamarin.iOS | 100.5 - 100.15 |
| UWP | 100.5 - 200.6 |
Relevant samples
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 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 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 the service. If you specify a null
or an empty collection for outfields, then the default set of outfields are used.
WFS is compatible with a subset of possible queries defined by QueryParameters. The WhereClause only works when the table is backed by a service powered by a GeoServer. Spatial queries (those that specify geometries) must use the Intersects spatial relationship.
You must ensure that the FeatureRequestMode is set to ManualCache before attempting to populate the table.
Applies to
Platforms and versions
| Target | Versions |
|---|---|
| .NET Standard 2.0 | 100.5 - 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 | 100.5 - 200.6 |
| Xamarin.Android | 100.5 - 100.14 |
| Xamarin.iOS | 100.5 - 100.15 |
| UWP | 100.5 - 200.6 |
PopulateFromServiceAsync(String, Boolean)
Asynchronously populates the table using an XML query.
Declaration
public Task<FeatureQueryResult> PopulateFromServiceAsync(string xmlRequest, bool clearCache)Parameters
| Type | Name | Description |
|---|---|---|
| System.String | xmlRequest | An XML-encoded GetFeature request. |
| System.Boolean | clearCache | A value indicating whether to clear existing table data before loading new results. |
Returns
| Type | Description |
|---|---|
| System.Threading.Tasks.Task<FeatureQueryResult> | A task that represents the asynchronous populate from service operation. The value of the task result is a FeatureQueryResult object. |
Remarks
The schema of the query result must match or be a subset of the schema of the table. The XML query must be made against the same feature type represented by the WFS feature table.
You must ensure that the FeatureRequestMode is set to ManualCache before attempting to populate the table.
Applies to
Platforms and versions
| Target | Versions |
|---|---|
| .NET Standard 2.0 | 100.5 - 200.6 |
| .NET | 100.13 - 200.6 |
| .NET Windows | 100.13 - 200.6 |
| .NET Android | 200.0 - 200.6 |
| .NET iOS | 200.0 - 200.6 |
| .NET Framework | 100.5 - 200.6 |
| Xamarin.Android | 100.5 - 100.15 |
| Xamarin.iOS | 100.5 - 100.15 |
| UWP | 100.5 - 200.6 |
PopulateFromServiceAsync(String, Boolean, CancellationToken)
Asynchronously populates the table using an XML query.
Declaration
public async Task<FeatureQueryResult> PopulateFromServiceAsync(string xmlRequest, bool clearCache, CancellationToken cancellationToken)Parameters
| Type | Name | Description |
|---|---|---|
| System.String | xmlRequest | An XML-encoded GetFeature request. |
| System.Boolean | clearCache | A value indicating whether to clear existing table data before loading new results. |
| 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 task that represents the asynchronous populate from service operation. The value of the task result is a FeatureQueryResult object. |
Remarks
Use XML to perform queries that aren't possible with QueryParameters. The schema of the query result should match or be a subset of the schema of the table. The queried feature type must be the same feature type represented by this table.
Applies to
Platforms and versions
| Target | Versions |
|---|---|
| .NET Standard 2.0 | 100.5 - 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 | 100.5 - 200.6 |
| Xamarin.Android | 100.5 - 100.14 |
| Xamarin.iOS | 100.5 - 100.15 |
| UWP | 100.5 - 200.6 |