C# Класс RSSWeatherLayer.RSSWeatherLayerClass

add a new item given only a zipcode (will use the default location given by the service) should the item exists, it will get updated

adds a new item given a zipcode and a coordinate. Should the item already exists, it will get updated and will move to the new coordinate.

connects to RSS weather service

delete an item from the dataset

disconnects from RSS weather service

Draws the layer to the specified display for the given draw phase.

the draw method is set as an abstract method and therefore must be overridden

Draw the layer while in dynamic mode

get a list of all citynames currently in the dataset.

Please note that since the unique ID is zipCode, it is possible to have a city name appearing more than once.

This method searches for the record of the given zipcode and retunes the information as a PropertySet.

get a weather item given a city name.

a city might have more than one zipCode and therefore this method will return the first zipcOde found for the specified city name.

Identifying all the weather items falling within the given envelope

The class has only default CTor.

Run the update thread

calling this method to frequently might end up in blockage of RSS service. The service will interpret the excessive calls as an offence and thus would block the service for a while.

select a weather item by its zipCode

unselect all weather items

Zoom to weather item according to its zipcode

Zoom to a weather item according to its city name

Map tip text at the specified mouse location.

Makes a request against RSS Weather service and add update the layer's table

create a WGS1984 geographic coordinate system. In this case, the underlying data provided by the service is in WGS1984.

given a bitmap url, saves it on the local machine and returns its size

get the overall extent of the items in the layer

get the specified symbol from the symbols table.

Initialize the location table. Gets the location from a featureclass

Initialize the symbol that would use to highlight selected items

Initialize a character marker symbol for a given bitmap path

initialize the main table used by the layer as well as the symbols table. The base class calles new on the table and adds a default ID field.

run the thread that does the update of the weather data

Load the information from the MajorCities featureclass to the locations table

the main update thread for the layer.

Since the layer gets the weather information from a web service which might take a while to respond, it is not logical to let the application hang while waiting for response. Therefore, running the request on a different thread frees the application to continue working while waiting for a response. Please note that in this case, synchronization of shared resources must be addressed, otherwise you might end up getting unexpected results.