Brad L,您好！
Thanks for your help,Brad!
Actually, My used the DOM-processing method the create the layer
definition exactly like the code you provided, they run well and created the
MgLayer object successfully, but the following steps (step 4 ,as I mentioned
first mail) ,the map.Save(resourceService) will raise the
MgNotImplementedException, So I changed to the string-processing way to create
layerdefinition. Both XML-processing and string-processing can create the
layerdefiniton and create the MgLayer object successfully ,and both of them get
the same exception in the following step---map.Save(...).
======= 2007-09-29 03:19:42 您在来信中写道：=======
>Try this
>
>public MgLayer CreateTrackLineLayer(String rootPath, MgResourceService
>resService, MgResourceIdentifier TrackResId, String sessionId)
> {
> // Load the TrackLinelayerdefinition template into
> // an ASPX XML object, find the "ResourceId" element, and
> // modify it's content to reference the feature source.
>
> XmlDocument doc = new XmlDocument();
> doc.PreserveWhitespace = true;
> doc.Load(rootPath + @"\Template\TrackLineLayerDefinition2.xml");
> XmlNode featureSourceNode =
>doc.GetElementsByTagName("ResourceId").Item(0);
> XmlNode resContent = doc.CreateTextNode(TrackResId.ToString());
> featureSourceNode.AppendChild(resContent);
>
> // Get the updated layer definition from the DOM object
> // and save it to the repository using the
> // ResourceService object.
>
> MemoryStream xmlStream = new MemoryStream();
> doc.Save(xmlStream);
> byte[] layerDefinition = xmlStream.ToArray();
> Encoding utf8 = Encoding.UTF8;
> String layerDefStr = new String(utf8.GetChars(layerDefinition));
> layerDefinition = new byte[layerDefStr.Length - 1];
> int byteCount = utf8.GetBytes(layerDefStr, 1, layerDefStr.Length -
>1, layerDefinition, 0);
> MgByteSource byteSource = new MgByteSource(layerDefinition,
>layerDefinition.Length);
> byteSource.SetMimeType(MgMimeType.Xml);
>
> //this stores it to the session but you could pass your
>MgResourceIdentifier as you did in your code
> MgResourceIdentifier tempLayerResId = new
>MgResourceIdentifier("Session:" + sessionId +
>"//TrackLineLayer.LayerDefinition");
>
> resService.SetResource(tempLayerResId, byteSource.GetReader(),
>null);
>
> // Create an MgLayer object based on the new layer definition
> // and return it to the caller.
>
> MgLayer newLayer = new MgLayer(tempLayerResId, resService);
>
> return newLayer;
> }
>
>I didn't debug this but it should get you in the ball park.
>
>Brad Leighninger
>Mathews & Associates, Inc
>417-869-6009
>
>
>
>Champin wrote:
>>
>> How to Create a layerDefinition programmtically , using xml?
>> ---------------------------------------
>>
>>
>> Here is my steps, but something wrong happened, MgNotImplementedException
>> raised when added the layer to the map and Map.Save()
>>
>>
>> 1.Using MapGuide Studio, Open an LayerDefinition , File --> Save as xml;
>> in fact, I want to create temp layer the same as the existing layer ,so
>> , the temp layers' layerDefinition should be the same as the existing
>> layer,except the <ResourceID>.....</ResourceID>
>>
>> 2. Change the resourceId to the replace flage ,such as <ResourceID>
>> %resourceID</ResourceID> and save the xml as layerDefinitionTemplate.xml
>>
>> 3.Create the Layer
>>
>> public MgLayerBase CreateTrackLineLayer(String rootPath,
>> MgResourceService resService, String featureSourceName,
>> MgResourceIdentifier LayerId)
>> {
>> MgLayerBase newLayer = null;
>>
>> //字符串方法
>> string layerDefinition = File.ReadAllText(rootPath +
>> @"\Template\TrackLineLayerDefinition2.xml");
>> layerDefinition = layerDefinition.Replace("%resourId",
>> featureSourceName);
>>
>> MgByteReader reader = new MgByteReader(layerDefinition,
>> "text/xml");
>> resService.SetResource(LayerId, reader, null);
>>
>> newLayer = new MgLayerBase(LayerId, resService);
>> return newLayer;
>> }
>>
>> these code goes well while debuging
>>
>> 4. Added the layer to the map and save .
>>
>>
>> MgLayerBase TrackLineLayer = CreateTrackLineLayer(.......);
>> // 设置层属性
>> TrackLineLayer.SetName("TrackLineLayer");
>> TrackLineLayer.SetDisplayInLegend(true);
>> TrackLineLayer.SetLegendLabel("航迹");
>> TrackLineLayer.SetVisible(true);
>> TrackLineLayer.ForceRefresh();
>> map.GetLayers().Insert(0, TrackLineLayer);
>>
>> // add some feature to the layer feature source
>> MgPropertyCollection props =BuildeNewPropCollection(.......);
>> MgFeatureCommandCollection commands = new
>> MgFeatureCommandCollection();
>> commands.Add(new MgInsertFeatures(featureName, props));
>> featureService.UpdateFeatures(TrackLineFeatureSourceID, commands,
>> false);
>>
>> //Save the map
>> TrackLineLayer.SetVisible(true);
>> TrackLineLayer.SetSelectable(true);
>> TrackLineLayer.ForceRefresh();
>>
>> map.Save(resService); //**** ERROR
>> here raise the Exception " MgNotImplementedException "
>>
>>
>>
>> Can you tell me what am I doing wrong? I have been blocked here for a
>> whole day, any suggestion will be very appreciate .
>> Thank you !
>>
>> My envionment :
>> Windows XP SP2
>> VS2005 .net 2.0 + MapGuide Open Source 1.2
>>
>>
>>
>
>--
>View this message in context:
>http://www.nabble.com/How-to-Create-a-layerDefinition-programmtically-%2C-using-xml--tf4514122s16610.html#a12946832
>Sent from the MapGuide Users mailing list archive at Nabble.com.
>
>_______________________________________________
>mapguide-users mailing list
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致
礼！
champingfor
[EMAIL PROTECTED]
2007-09-29
---------------------------------
MapGuide Developer Network(China)
http://www.mgdn.com.cn
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