hi,
i have created shapefile categories based on attributes on button click event. When i click the button again one more categories is created. How do i clear/remove the existing categories for all shapefiles.
Kindly check below code and attached jpg.
Below is the code:
for (int i = 0; i < ShapeFileList.Count; i++)
{
shapeFile = ShapeFileList[i] as MapWinGIS.Shapefile;
if (shapeFile == null) { continue; }
ShapeDrawingOptions options = shapeFile.DefaultDrawingOptions;
options.PointType = tkPointSymbolType.ptSymbolStandard;
options.FillColor = utils.ColorByName(tkMapColor.Red);
ShapefileCategory ct = shapeFile.Categories.Add("OVER");
Opattern.AddLine(utils.ColorByName(tkMapColor.Red), 5.0f, tkDashStyle.dsDash);
ct.DrawingOptions.LinePattern = Opattern;
ct.DrawingOptions.UseLinePattern = true;
options.PointType = tkPointSymbolType.ptSymbolStandard;
options.FillColor = utils.ColorByName(tkMapColor.Green);
ShapefileCategory Uct = shapeFile.Categories.Add("UNDER");
Upattern.AddLine(utils.ColorByName(tkMapColor.Green), 5.0f, tkDashStyle.dsDash);
Uct.DrawingOptions.LinePattern = Upattern;
Uct.DrawingOptions.UseLinePattern = true;
options.PointType = tkPointSymbolType.ptSymbolStandard;
options.FillColor = utils.ColorByName(tkMapColor.Blue);
ShapefileCategory Nct = shapeFile.Categories.Add("NORMAL");
Npattern.AddLine(utils.ColorByName(tkMapColor.Blue), 5.0f, tkDashStyle.dsDash);
Nct.DrawingOptions.LinePattern = Npattern;
Nct.DrawingOptions.UseLinePattern = true;
options.PointType = tkPointSymbolType.ptSymbolStandard;
options.FillColor = utils.ColorByName(tkMapColor.DarkGray);
ShapefileCategory Noct = shapeFile.Categories.Add("");
Ncotpattern.AddLine(utils.ColorByName(tkMapColor.DarkGray), 5.0f, tkDashStyle.dsCustom);
Noct.DrawingOptions.LinePattern = Ncotpattern;
Noct.DrawingOptions.UseLinePattern = true;