public static LayerMetadata ReadLayerMetadata( JsonObject json )
{
json.RequireArgument<JsonObject>( "json" ).NotNull<JsonObject>();
LayerMetadata lyr = new LayerMetadata();
lyr.ID = (int)GetRequiredEntryValue( json, LYR_ID );
lyr.Name = (string)GetRequiredEntryValue( json, LYR_NAME );
lyr.Type = (string)GetRequiredEntryValue( json, LYR_TYPE );
lyr.GeometryType = ( string ) GetRequiredEntryValue( json, LYR_GEOMETRY_TYPE );
lyr.Description = ( string ) GetRequiredEntryValue( json, LYR_DESCRIPTION );
lyr.DefinitionExpression = ( string ) GetRequiredEntryValue( json, LYR_DEFINITION_EXPRESSION );
lyr.CopyrightText = ( string ) GetRequiredEntryValue( json, LYR_COPYRIGHT_TEXT );
lyr.MinimumScale = ( double ) GetRequiredEntryValue( json, LYR_MINIMUM_SCALE );
lyr.MaximumScale = ( double ) GetRequiredEntryValue( json, LYR_MAXIMUM_SCALE );
string extent_entry = GetMatchingKey( json, LYR_EXTENT );
if( string.IsNullOrEmpty( extent_entry ) )
throw new FormatException( "An extent member is required in the layer metadata object." );
if( !( json[ LYR_EXTENT ] is JsonObject ) )
throw new FormatException( "The extent member should be of type JsonObject." );
lyr.Extent = ReadEnvelope( json[ LYR_EXTENT ] as JsonObject);
lyr.DisplayField = ( string ) GetRequiredEntryValue( json, LYR_DISPLAY_FIELD );
string fields_entry = GetMatchingKey( json, LYR_FIELDS );
if( string.IsNullOrEmpty( fields_entry ) )
throw new FormatException( "A fields member is required in the layer metadata object." );
if( json[ LYR_FIELDS ] != null )
{
if( !( json[ LYR_FIELDS ] is JsonArray ) )
throw new FormatException( "The fields member should be of type JsonArray." );
lyr.Fields = ReadFieldMetadataArray( json[ LYR_FIELDS ] as JsonArray );
}
string parentLayer_entry = GetMatchingKey( json, LYR_PARENT_LAYER );
if( string.IsNullOrEmpty( parentLayer_entry ) )
throw new FormatException( "An parentLayer member is required in the layer metadata object." );
if(json[LYR_PARENT_LAYER] != null)
{
if( !( json[ LYR_PARENT_LAYER ] is JsonObject ) )
throw new FormatException( "The parentLayer member should be of type JsonObject." );
lyr.ParentLayer = ReadLayerReference( json[ LYR_PARENT_LAYER ] as JsonObject);
}
string subLayers_entry = GetMatchingKey( json, LYR_SUBLAYERS );
if( string.IsNullOrEmpty( subLayers_entry ) )
throw new FormatException( "A subLayers member is required in the layer metadata object." );
if( json[ LYR_SUBLAYERS ] != null )
{
if( !( json[ LYR_SUBLAYERS ] is JsonArray ) )
throw new FormatException( "The subLayers member should be of type JsonArray." );
lyr.SubLayers = ReadLayerReferenceArray( json[ LYR_SUBLAYERS ] as JsonArray );
}
return lyr;
}
private void HandleLayerMetaData( string metadata )
{
JsonObject lyrMetadataJSON = JsonObject.Parse( metadata ) as JsonObject;
LayerMetadata = ArcJSONReader.ReadLayerMetadata( lyrMetadataJSON );
LayerType = LayerTypeProvider.CreateLayerRecordType( LayerMetadata );
QueryTask queryTask = new QueryTask( "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/5" );
queryTask.ExecuteCompleted += QueryTask_ExecuteCompleted;
queryTask.Failed += QueryTask_Failed;
Query query = new Query();
query.OutFields.Add( "*" );
query.Where = "1=1";
queryTask.ExecuteAsync( query );
}
