This section focuses on code calculation. Let's take a look at the implementation of some simple functions through the code. I am about to have a holiday, so I can't write well without having to worry about it. It may be better to paste the code.
1. Get all layers
ESRI. ArcGIS. server. webcontrols. webmap = map1.createwebmap ();
Try
{
ESRI. ArcGIS. Carto. imapdescription descr = webmap. mapdescription;
Ddllayers. Items. Clear ();
Int ID;
For (INT I = 0; I <= descr. layerdescriptions. Count-1; I ++)
{
Id = descr. layerdescriptions. get_element (I). ID;
Ddllayers. Items. Add (Id. tostring () + "," + webmap. layernamefromid (ID); // ddllayers is a dropdownlist Control
}
If (ddllayers. Items. Count> 0)
{
Ddllayers. selectedindex = 0;
}
}
Finally
{
Webmap. Dispose ();
}
2. Get the layer object through the layer ID
Private ifeaturelayer getfeaturelayer (INT lyid)
{
Webmap = map1.createwebmap ();
Try
{
Ilayer layer = (webmap. mapserver as imapserverobjects). get_layer (webmap. dataframe, lyid );
If (layer = NULL)
Return NULL;
Else
{
Return (layer as ifeaturelayer );
}
}
Finally
{
Webmap. Dispose ();
}
}
3. Create a polygon
Private void map1_polygon (Object sender, ESRI. ArcGIS. server. webcontrols. polygoneventargs ARGs)
{
If (ARGs. toolname = "newpolygon ")
{
Ifeaturelayer flayer = getcurfeaturelayer (); // you can call the getfeaturelayer (INT lyid) function to obtain the function of the current active layer.
If (flayer = NULL) return;
If (flayer. featureclass. shapetype! = ESRI. ArcGIS. Geometry. esrigeometrytype. esrigeometrypolygon)
{
String SC;
SC = "<script language = JavaScript> alert ('the current layer type is incorrect! ') </SCRIPT> ";
Page. registerclientscriptblock ("shapetypeerror", SC );
Return;
}
// Generate a polygon
ESRI. ArcGIS. server. iservercontext context;
ESRI. ArcGIS. server. webcontrols. webmap = map1.createwebmap ();
Webmap. managelifetime (flayer );
Context = webmap. servercontext;
ESRI. ArcGIS. Geometry. ipolympus Gon poly = context. Createobject ("esrigeometry. Polygon") as ESRI. ArcGIS. Geometry. ipolympus gon; // 'new AG. polygonclass ();
Webmap. managelifetime (poly );
ESRI. ArcGIS. Geometry. ipoint pt;
ESRI. ArcGIS. Geometry. igeometrycollection ringcol = context. Createobject ("esrigeometry. Polygon") as ESRI. ArcGIS. Geometry. igeometrycollection; // new polygonclass ();
Webmap. managelifetime (ringcol );
ESRI. ArcGIS. Geometry. ipointcollection ptcol = context. Createobject ("esrigeometry. Ring") as ESRI. ArcGIS. Geometry. ipointcollection; // new ringclass ();
Webmap. managelifetime (ptcol );
Object OBJ = type. missing;
For (INT I = 0; I <= args. vectors. Length-1; I ++)
{
PT = webmap. tomappoint (ARGs. vectors [I]. X, argS. vectors [I]. y );
Ptcol. addpoint (PT, ref OBJ, ref OBJ );
}
Ringcol. addgeometry (ptcol as igeometry, ref OBJ, ref OBJ );
Poly = ringcol as ipolympus gon;
// Write the Polygon into the layer.
ESRI. ArcGIS. Geodatabase. ifeature feature = flayer. featureclass. createfeature ();
Feature. Shape = POLY as igeometry;
Feature. Store ();
Webmap. Refresh ();
Webmap. Dispose ();
}
}
4. Select a rectangle to obtain the selection set and display the selected object on the map. (This function takes more than a day .)
Private void map1_dragrectangle (Object sender, ESRI. ArcGIS. server. webcontrols. tooleventargs ARGs)
{
String strtool = args. toolname. tolower ();
If (strtool = "rectsel ")
{
// Obtain the current Layer
If (ddllayers. selectedvalue = "")
Return;
Ifeaturelayer flayer = getcurfeaturelayer ();
If (flayer = NULL) return;
// Obtain the selection set
Int T1 = environment. tickcount;
ESRI. ArcGIS. server. webcontrols. webmap = map1.createwebmap ();
ESRI. ArcGIS. server. iservercontext CTX = webmap. servercontext;
Webmap. managelifetime (CTX );
ESRI. ArcGIS. Geodatabase. iworkspace Ws = (flayer. featureclass as ESRI. ArcGIS. Geodatabase. idataset). workspace;
ESRI. ArcGIS. Geometry. ienvelope Env = CTX. Createobject ("esrigeometry. Envelope") as ESRI. ArcGIS. Geometry. ienvelope;
Webmap. managelifetime (WS );
Webmap. managelifetime (ENV );
Ipoint Pt = webmap. tomappoint (convert. toint32 (request. Params. Get ("Maxx"), convert. toint32 (request. Params. Get ("Maxy ")));
Env. xmax = pt. X;
Env. ymin = pt. Y;
PT = webmap. tomappoint (convert. toint32 (request. Params. Get ("Minx"), convert. toint32 (request. Params. Get ("miny ")));
Env. xmin = pt. X;
Env. Ymax = pt. Y;
ESRI. ArcGIS. Geodatabase. ispatialfilter filter = CTX. Createobject ("esrigeodatabase. spatialfilter") as ESRI. ArcGIS. Geodatabase. ispatialfilter;
Webmap. managelifetime (filter );
Filter. spatialrel = ESRI. ArcGIS. Geodatabase. esrispatialrelenum. esrispatialrelintersects;
Filter. Geometry = env as ESRI. ArcGIS. Geometry. igeometry;
Filter. geometryfield = flayer. featureclass. shapefieldname;
ESRI. ArcGIS. Geodatabase. iselectionset sset = flayer. featureclass. Select (filter, ESRI. ArcGIS. Geodatabase. esriselectiontype. Optional, ESRI. ArcGIS. Geodatabase. esriselectionoption. esriselectionoptionnormal, WS );
Int t2 = environment. tickcount;
Int T3 = t2-t1; // T3 is the query response time, can be used to test the performance, huh, huh
// Display the selection set
Int ID;
ESRI. ArcGIS. Geodatabase. ienumids;
IDS = sset. IDS;
Webmap. managelifetime (IDS );
IDs. Reset ();
ESRI. ArcGIS. Geodatabase. ifidset fidset = CTX. Createobject ("esrigeodatabase. fidset") as ESRI. ArcGIS. Geodatabase. ifidset;
Id = IDs. Next ();
While (ID> = 0)
{
Fidset. Add (ID );
Id = IDs. Next ();
}
Imapdescription DESC = webmap. mapdescription as imapdescription;
Webmap. managelifetime (DESC );
Ilayerdescription ldesc = DESC. layerdescriptions. get_element (flyid );
Webmap. managelifetime (ldesc );
Ldesc. selectionfeatures = fidset;
// Save the selection information in the session
Session ["selection"] = sset;
Session ["layerid"] = flyid;
Webmap. Refresh ();
Webmap. Dispose ();
}
}
5. Delete the selected object
Private void deletesel ()
{
If (session ["layerid"] = NULL) return;
If (session ["selection"] = NULL) return;
Int layerid = (INT) session ["layerid"];
If (layerid =-1) return;
ESRI. ArcGIS. Geodatabase. iselectionset sset = session ["selection"] as ESRI. ArcGIS. Geodatabase. iselectionset;
If (sset = NULL) return;
Webmap = map1.createwebmap ();
Ifeaturelayer layer = getfeaturelayer (layerid );
If (layer = NULL) return;
Webmap. managelifetime (layer );
Webmap. managelifetime (sset );
ESRI. ArcGIS. Geodatabase. ienumids IDs = sset. IDS;
Webmap. managelifetime (IDS );
IDs. Reset ();
Int ID;
Id = IDs. Next ();
ESRI. ArcGIS. Geodatabase. ifeature feature;
ESRI. ArcGIS. server. iservercontext CTX = webmap. servercontext;
Webmap. managelifetime (CTX );
// Convert selectionset to featurecursor object
ESRI. ArcGIS. Geodatabase. ifeaturecursor fcursor;
ESRI. ArcGIS. Geodatabase. icursor cursor;
Sset. Search (null, false, out cursor );
Fcursor = cursor as ESRI. ArcGIS. Geodatabase. ifeaturecursor;
ESRI. ArcGIS. esrisystem. Iset pdeleteset = CTX. Createobject ("esrisystem. Set") as ESRI. ArcGIS. esrisystem. Set;
Webmap. managelifetime (pdeleteset );
// Set the Iset object
Feature = fcursor. nextfeature ();
While (feature! = NULL)
{
Pdeleteset. Add (feature );
Feature = fcursor. nextfeature ();
}
ESRI. ArcGIS. Geodatabase. ifeatureedit fedit;
Pdeleteset. Reset ();
Fedit = pdeleteset. Next () as ESRI. ArcGIS. Geodatabase. ifeatureedit;
While (fedit! = NULL)
{
Fedit. deleteset (pdeleteset );
Fedit = pdeleteset. Next () as ESRI. ArcGIS. Geodatabase. ifeatureedit;
}
Session. Remove ("layerid ");
Session. Remove ("selection ");
Webmap. Refresh ();
Webmap. Dispose ();
}
