c# - Creating New layers in SHARPMAP -

i'm working on sharpmaps, have map of , how add new layers on maps ?

as need write name of state on basic layer , color each state different colours. possible achive goal in sharpmaps...?

you must use "custom them" color each state , "label layer" name of state

you must first 1 delegate method define.the delegate takes featuredatarow parameter , can handle custom style

for example

private sharpmap.styles.vectorstyle getcountrystyle(sharpmap.data.featuredatarow row) {     sharpmap.styles.vectorstyle style = new sharpmap.styles.vectorstyle();     switch (row["name"].tostring().tolower())     {         case "denmark": //if country name danmark, fill green             style.fill = brushes.green;             return style;         case "united states": //if country name usa, fill blue , add red outline             style.fill = brushes.blue;             style.outline = pens.red;             return style;         case "china": //if country name china, fill red             style.fill = brushes.red;             return style;         default:             break;     }     //if country name starts s make yellow     if (row["name"].tostring().startswith("s"))     {         style.fill = brushes.yellow;         return style;     }     // if geometry (multi)polygon , area of polygon less 30, make cyan     else if (row.geometry geoapi.geometries.ipolygonal && row.geometry.area < 30)     {         style.fill = brushes.cyan;         return style;     }     else //none of above -> use default style         return null; } 

and set theme property of layer method

sharpmap.rendering.thematics.customtheme mytheme = new sharpmap.rendering.thematics.customtheme(getcountrystyle); myvectorlayer.theme = mytheme ; 

and label layer must new layer labellayer define example

//name of table in database string tablename = "roads";  //name of object id column - must integer! string idcolumn = "gid";  //create layer sharpmap.layers.vectorlayer layroads= new sharpmap.layers.vectorlayer("roads"); layroads.datasource = datasource; //set road label layer sharpmap.layers.labellayer layroadlabel = new sharpmap.layers.labellayer("road labels"); //set datasource of layroads. layroadlabel.datasource = layroads.datasource; layroadlabel.enabled = true; //specifiy field contains label string. layroadlabel.labelcolumn = "roadofname";  //add layer map mymap.layers.add(layroads); //add label layer map mymap.layers.add(layroadlabel);  

tells here