WmsAsyncLayer &para;

IsTransparent¶

This property gets or sets whether the response map image's background color is transparent or not.

public bool IsTransparent { get; set; }

Property Value¶

OutputFormat¶

This property gets or sets the desired output format for the map being requested from the WMS.

public string OutputFormat { get; set; }

Property Value¶

Remarks:

When requesting a map, a client may specify the output format in which to show the map. Formats are specified as MIME types such as "image/gif" or "image/png".

Crs¶

This property gets or sets the projected or geographic coordinate reference system to be used.

public string Crs { get; set; }

Property Value¶

Exceptions¶

This property indicates the format in which the client wishes to be notified of service exceptions.

public string Exceptions { get; set; }

Property Value¶

Dictionary<String, String>

Remarks:

Upon receiving a request that is invalid according to the OGC standard, the server shall issue a service exception report. The service report is meant to describe to the client application or its human user the reason(s) that the request is invalid.

Parameters¶

This property specifies a dictionary used to update the request sent from the client to the WMS server.

public Dictionary<string, string> Parameters { get; }

Property Value¶

AxisOrder¶

This property specifies the order in which the coordinate axes are arranged when making requests to a Web Map Service (WMS) server. It is used to define the spatial reference system for the layer.

public WmsAxisOrder AxisOrder { get; set; }

Property Value¶

WmsAxisOrder

FastMode¶

This property gets or sets whether request and parse capabilities.

public bool FastMode { get; set; }

Property Value¶

CapabilitiesCacheTimeout¶

The timeout for Capabilities Cache, its 10 minutes by default

public TimeSpan CapabilitiesCacheTimeout { get; set; }

Property Value¶

TimeSpan

HasBoundingBox¶

This property checks to see if a Layer has a BoundingBox or not. If it has no BoundingBox, it will throw an exception when you call the GetBoundingBox() and GetFullExtent() APIs.

public bool HasBoundingBox { get; }

Property Value¶

Remarks:

The override in the WmsRasterLayer sets it to true.

WebProxy¶

public IWebProxy WebProxy { get; set; }

Property Value¶

IWebProxy

TimeoutInSeconds¶

public int TimeoutInSeconds { get; set; }

Property Value¶

Int32

UpperThreshold¶

This property gets and sets the upper threshold in the scale at which to display the image.

public double UpperThreshold { get; set; }

Property Value¶

Double
This property gets the upper threshold in the scale at which to display the image.

Remarks:

Above the upper threshold in scale, the image will not be displayed. This, in conjunction with the LowerThreshold property, allows you to create a band in which it is suitable to display the image source. By default, the upper threshold is double.max and lower threshold is 0. This means the image should always display.

LowerThreshold¶

This property gets and sets the lower threshold in the scale at which to display the image.

public double LowerThreshold { get; set; }

Property Value¶

Double
This property gets the lower threshold in the scale at which to display the image.

Remarks:

Below the lower threshold in scale, the image will not be displayed. This, in conjunction with the UpperThreshold property, allows you to create a band in which it is suitable to display the image source. By default, the upper threshold is double.max and lower threshold is 0. This means the image should always display.

Credentials¶

This property gets or sets the base authentication interface for retrieving credentials for Web Client authentication.

public ICredentials Credentials { get; set; }

Property Value¶

ICredentials

UserAgent¶

This property allows you to specify a custom user-agent request header when making requests to a Web server. This header provides information about the client application or device and can be useful for server-side logging and analytics.

public string UserAgent { get; set; }

Property Value¶

Name¶

This property gets and sets the name for the layer.

public string Name { get; set; }

Property Value¶

Remarks:

The name is user defined. It is useful to set, as it may be used for higher level components such as legends, etc.

IsOpen¶

This property returns true if the Layer is open and false if it is not.

public bool IsOpen { get; }

Property Value¶

Remarks:

This method is the concrete wrapper for the abstract method IsOpenCore. Various methods on the Layer require that it be in an open state. If one of those methods is called when the state is not open, then the method will throw an exception. To enter the open state, you must call the Layer Open method. The method will raise an exception if the current Layer is already open.

As this is a concrete public method that wraps a Core method, we reserve the right to add events and other logic to pre- or post-process data returned by the Core version of the method. In this way, we leave our framework open on our end, but also allow you the developer to extend our logic to suit your needs. If you have questions about this, please contact our support team as we would be happy to work with you on extending our framework.

IsVisible¶

This property gets and set the visible state of the layer.

public bool IsVisible { get; set; }

Property Value¶

Remarks:

If this property is set to false, the layer will not draw. We ensure this in the Draw method. This is useful for legends and other controls that control the visibility of layers.

DrawingTime¶

This property gets the last drawing time for the layer.

public TimeSpan DrawingTime { get; protected set; }

Property Value¶

TimeSpan

Remarks:

We track the drawing time for the layer and report it back in this method. This is useful for determining the speed of various layers.

Projection¶

Gets the projection of the layer.

public Projection Projection { get; set; }

Property Value¶

Projection

DrawingExceptionMode¶

public DrawingExceptionMode DrawingExceptionMode { get; set; }

Property Value¶

DrawingExceptionMode

Background¶

Gets and sets the background of the layer.

public GeoColor Background { get; set; }

Property Value¶

GeoColor

Transparency¶

This property gets and sets the amount of transparency to apply to the image.

public float Transparency { get; set; }

Property Value¶

Single
This property gets the amount of transparency to apply to the image.

Remarks:

None

BlueTranslation¶

This property gets and sets the amount of blue to apply to the image.

public float BlueTranslation { get; set; }

Property Value¶

Single
This property gets the amount of blue to apply to the image.

Remarks:

None

RedTranslation¶

This property gets and sets the amount of red to apply to the image.

public float RedTranslation { get; set; }

Property Value¶

Single
This property gets the amount of red to apply to the image.

Remarks:

None

GreenTranslation¶

This property gets and sets the amount of green to apply to the image.

public float GreenTranslation { get; set; }

Property Value¶

Single
This property gets the amount of green to apply to the image.

Remarks:

None

KeyColors¶

Gets a value represents a collection of key colors. If SupportKeyColor property is false, it will throw exception when you use KeyColors.

public Collection<GeoColor> KeyColors { get; }

Property Value¶

Collection<GeoColor>

Remarks:

It will make these colors transparent when draw image.

IsNegative¶

This property gets and sets whether the image should be converted to negative (inverse colors).

public bool IsNegative { get; set; }

Property Value¶

Boolean
This property gets and sets whether the image should be converted to negative (inverse colors).

Remarks:

None

IsGrayscale¶

This property gets and sets if the image should be converted to grayscale.

public bool IsGrayscale { get; set; }

Property Value¶

Dictionary<GeoColor, GeoColor>

        This property gets and sets if the image should be converted to grayscale.

Remarks:

None

ThreadSafe¶

public ThreadSafetyLevel ThreadSafe { get; set; }

Property Value¶

ThreadSafetyLevel

ColorMappings¶

ColorMapping

public Dictionary<GeoColor, GeoColor> ColorMappings { get; }

Property Value¶

WrappingMode¶

public WrappingMode WrappingMode { get; set; }

Property Value¶

WrappingMode

WrappingExtent¶

public RectangleShape WrappingExtent { get; set; }

Property Value¶

RectangleShape

Constructors¶

WmsAsyncLayer()¶

This is the constructor for the class. If you use this constructor, then you need to set the required properties manually.

public WmsAsyncLayer()

Remarks:

None

WmsAsyncLayer(Uri)¶

This is the constructor the for the class.

public WmsAsyncLayer(Uri uri)

Parameters¶

uri Uri
URI of the WMS server.

Remarks:

This constructor initializes a new WmsRasterSource and downloads and parses the service description. In an ASP.NET application, the service description is automatically cached for 24 hours when it is not specified.

WmsAsyncLayer(Uri, IWebProxy)¶

This is the constructor the for the class.

public WmsAsyncLayer(Uri uri, IWebProxy webProxy)

Parameters¶

uri Uri
URI of the WMS server.

webProxy IWebProxy
Proxy to use for the current WMS layer.

Remarks:

This constructor initializes a new WmsRasterSource and downloads and parses the service description. In an ASP.NET application, the service description is automatically cached for 24 hours when it is not specified.

WmsAsyncLayer(Uri, IWebProxy, String, WmsAxisOrder, String, Boolean)¶

This is the constructor the for the class.

public WmsAsyncLayer(Uri uri, IWebProxy webProxy, string crs, WmsAxisOrder axisOrder, string version, bool fastMode)

Parameters¶

uri Uri
URI of the WMS server.

webProxy IWebProxy
Proxy to use for the current WMS layer.

crs String
the projected or geographic coordinate reference system to be used.

axisOrder WmsAxisOrder
the axis order of the layer

version String
version of the WMS server

fastMode Boolean
whether request and parse capabilities

Remarks:

This constructor initializes a new WmsRasterSource and downloads and parses the service description In an ASP.NET application, the service description is automatically cached for 24 hours when it is not specified.

WmsAsyncLayer(Collection<WmsServerLayer>)¶

public WmsAsyncLayer(Collection<WmsServerLayer> flatWmsServerLayers)

Parameters¶

flatWmsServerLayers Collection<WmsServerLayer>

Methods¶

OnRequestedImageException(RequestedImageExceptionEventArgs)¶

protected void OnRequestedImageException(RequestedImageExceptionEventArgs e)

Parameters¶

e RequestedImageExceptionEventArgs

GetServerLayers()¶

This method returns all layers at the server side.

public Collection<WmsServerLayer> GetServerLayers()

Returns¶

Collection<WmsServerLayer>
The names of all layers at the server side.

Remarks:

None.

GetServerStyleNames()¶

This method returns the names of all styles at the server side.

public Collection<string> GetServerStyleNames()

Returns¶

Collection<String>
The names of all styles at the server side.

Remarks:

None.

GetServerOutputFormats()¶

This method returns the output format at the server side.

public Collection<string> GetServerOutputFormats()

Returns¶

Collection<String>
The output format at the server side.

Remarks:

None.

GetServerCrsCollection()¶

This method returns the projected or geographic coordinate reference systems to be used.

public Collection<string> GetServerCrsCollection()

Returns¶

Collection<String>

GetServerExceptionFormats()¶

This method returns the exception format at the server side.

public Collection<string> GetServerExceptionFormats()

Returns¶

Collection<String>
The exception format at the server side.

Remarks:

None.

GetServiceVersion()¶

This API gets the WMS server version of the service.

public string GetServiceVersion()

Returns¶

String
Returns a string reflecting the version of the service in WMS.

GetServiceBaseUrl()¶

This API gets the WMS base url of the service.

public string GetServiceBaseUrl()

Returns¶

String
Returns a string reflecting the WMS base url.

GetServerFeatureInfoFormats()¶

This API gets the WMS server FeatureInfo formats of the service.

public Collection<string> GetServerFeatureInfoFormats()

Returns¶

Collection<String>
This API returns the FeatureInfo formats supported on the server-side.

GetServerCapabilitiesXml()¶

This API gets the GetCapabilities document of the service.

public string GetServerCapabilitiesXml()

Returns¶

String
This API returns the GetCapabilities document of the service.

GetRequestUrl(RectangleShape, Int32, Int32)¶

Get the request URL from the client to the WMS.

public string GetRequestUrl(RectangleShape worldExtent, int canvasWidth, int canvasHeight)

Parameters¶

worldExtent RectangleShape
The world extent requested by the client to get the map.

canvasWidth Int32
The returning map width, as well as the drawing view width.

canvasHeight Int32
The returning map height, as well as the drawing view height.

Returns¶

String
The request URL from the client to the WMS.

GetRequestUrlCore(RectangleShape, Int32, Int32)¶

protected string GetRequestUrlCore(RectangleShape worldExtent, int canvasWidth, int canvasHeight)

Parameters¶

worldExtent RectangleShape

canvasWidth Int32

canvasHeight Int32

Returns¶

OpenAsyncCore(CancellationToken)¶

This method opens the RasterSource so that it is initialized and ready to use.

protected Task OpenAsyncCore(CancellationToken cancellationToken)

Parameters¶

cancellationToken CancellationToken

Returns¶

Task
None

Exceptions¶

InvalidOperationException
In the event you attempt to call this method on an image source which has already been opened, it will throw an InvalidOperationException.

Remarks:

This protected virtual method is called from the concrete public method Open. The Open method plays an important role, as it is responsible for initializing the RasterSource. Most methods on the RasterSource will throw an exception if the state of the RasterSource is not opened. When the map draws each layer, it will open the RasterSource as one of its first steps; then, after it is finished drawing with that layer, it will close it. In this way, we are sure to release all resources used by the RasterSource.

When implementing this abstract method, consider opening files for file-based sources, connecting to databases in the database-based sources and so on. You will get a chance to close these in the Close method of the RasterSource.

CloseAsyncCore(CancellationToken)¶

protected Task CloseAsyncCore(CancellationToken cancellationToken)

Parameters¶

cancellationToken CancellationToken

Returns¶

Task

GetBoundingBoxCore()¶

This method returns the bounding box of the RasterSource.

protected RectangleShape GetBoundingBoxCore()

Returns¶

RectangleShape
The bounding box of the RasterSource.

Exceptions¶

InvalidOperationException
In the event you attempt to call this method on an image source which has not been opened, it will throw an InvalidOperationException.

Remarks:

This method returns the bounding box of the RasterSource.

DrawAsyncCore(GeoCanvas, Collection<SimpleCandidate>)¶

protected Task DrawAsyncCore(GeoCanvas canvas, Collection<SimpleCandidate> labelsInAllLayers)

Parameters¶

canvas GeoCanvas

labelsInAllLayers Collection<SimpleCandidate>

Returns¶

Task

BuildWmsGetFeatureInfoUri(ScreenPointF, String, Int32)¶

protected string BuildWmsGetFeatureInfoUri(ScreenPointF screenPointF, string infoFormat, int maxFeatures)

Parameters¶

screenPointF ScreenPointF

infoFormat String

maxFeatures Int32

Returns¶

GetFeatureInfoAsync(ScreenPointF, Int32, CancellationToken)¶

public Task<Dictionary<string, Collection<Feature>>> GetFeatureInfoAsync(ScreenPointF screenPointF, int maxFeatures, CancellationToken cancellationToken)

Parameters¶

screenPointF ScreenPointF

maxFeatures Int32

cancellationToken CancellationToken

Returns¶

GetFeatureInfoAsync(ScreenPointF, CancellationToken)¶

public Task<Dictionary<string, Collection<Feature>>> GetFeatureInfoAsync(ScreenPointF screenPointF, CancellationToken cancellationToken)

Parameters¶

screenPointF ScreenPointF

cancellationToken CancellationToken

Returns¶

GetFeatureInfoAsync(ScreenPointF, String, CancellationToken)¶

public Task<Dictionary<string, Collection<Feature>>> GetFeatureInfoAsync(ScreenPointF screenPointF, string infoFormat, CancellationToken cancellationToken)

Parameters¶

screenPointF ScreenPointF

infoFormat String

cancellationToken CancellationToken

Returns¶

GetFeatureInfo(ScreenPointF, Int32, CancellationToken)¶

public Task<Dictionary<string, Collection<Feature>>> GetFeatureInfo(ScreenPointF screenPointF, int maxFeatures, CancellationToken cancellationToken)

Parameters¶

screenPointF ScreenPointF

maxFeatures Int32

cancellationToken CancellationToken

Returns¶

GetFeatureInfoAsync(ScreenPointF, String, Int32, CancellationToken)¶

public Task<Dictionary<string, Collection<Feature>>> GetFeatureInfoAsync(ScreenPointF screenPointF, string infoFormat, int maxFeatures, CancellationToken cancellationToken)

Parameters¶

screenPointF ScreenPointF

infoFormat String

maxFeatures Int32

cancellationToken CancellationToken

Returns¶

GetFeatureInfoAsyncCore(ScreenPointF, String, Int32, CancellationToken)¶

protected Task<Dictionary<string, Collection<Feature>>> GetFeatureInfoAsyncCore(ScreenPointF screenPointF, string infoFormat, int maxFeatures, CancellationToken cancellationToken)

Parameters¶

screenPointF ScreenPointF

infoFormat String

maxFeatures Int32

cancellationToken CancellationToken

Returns¶

DownloadImageAsyncCore(Double, Double, Double, RectangleShape, GeographyUnit, CancellationToken)¶

protected Task<Byte[]> DownloadImageAsyncCore(double width, double height, double scaleFactor, RectangleShape extent, GeographyUnit mapUnit, CancellationToken cancellationToken)

Parameters¶

width Double

height Double

scaleFactor Double

extent RectangleShape

mapUnit GeographyUnit

cancellationToken CancellationToken

Returns¶

Task<Byte[]>

HandleResponseAsync(HttpRequestMessage, CancellationToken)¶

internal Task<Dictionary<string, Collection<Feature>>> HandleResponseAsync(HttpRequestMessage request, CancellationToken cancellationToken)

Parameters¶

request HttpRequestMessage

cancellationToken CancellationToken

Returns¶