How to get Only one acadobject by selection set

问题

I have some trouble to select the targeted acadObject. I get the input via selectionset.SelectonScreen method.

Here i can get more number of object from modelspace based on my filter condition.But i need only one object from the user.

Here i mentioned my code below:

AcadSelectionSet selset= null;
selset=currDoc.selectionset.add("Selset");
short[] ftype=new short[1];
object[] fdata=new object[1];
ftype[0]=2;//for select the blockreference
fdata[0]=blkname;
selset.selectOnScreen ftype,fdata;  // Here i can select any no. of blocks according to filter value but i need only one block reference.

Please help me to solve this problem.

回答1:

That's possible using other Autocad .NET libraries (instead of Interop library). But fortunately, one does not exclude the other.

You will need to reference the libraries containing the following namespaces:

using Autodesk.Autocad.ApplicationServices
using Autodesk.Autocad.EditorInput
using Autodesk.Autocad.DatabaseServices

(you get those downloading the Object Arx libraries for free from Autodesk):

You will need to access the Editor from an autocad Document. By the code you've shown, you're probably working with AcadDocument documents. So, to transform an AcadDocument into a Document, do this:

//These are extension methods and must be in a static class
//Will only work if Doc is saved at least once (has full name) - if document is new, the name will be 
public static Document GetAsAppServicesDoc(this IAcadDocument Doc)
    {
        return Application.DocumentManager.OfType<Document>().First(D => D.Name == Doc.FullOrNewName());
    }

 public static string FullOrNewName(this IAcadDocument Doc)
    {
        if (Doc.FullName == "")
            return Doc.Name;
        else
            return Doc.FullName;
    }

Once you've got a Document, get the Editor, and the GetSelection(Options, Filter)

The Options contains a property SingleOnly and a SinglePickInSpace. Setting that to true does what you want. (Try both to see wich works better)

//Seleciton options, with single selection
PromptSelectionOptions Options = new PromptSelectionOptions();
Options.SingleOnly = true;
Options.SinglePickInSpace = true;

//This is the filter for blockreferences
SelectionFilter Filter = new SelectionFilter(new TypedValue[] { new TypedValue(0, "INSERT") });


//calls the user selection
PromptSelectionResult Selection = Document.Editor.GetSelection(Options, Filter);

if (Selection.Status == PromptStatus.OK)
{
    using (Transaction Trans = Document.Database.TransactionManager.StartTransaction())
    {
        //This line returns the selected items
       AcadBlockReference SelectedRef = (AcadBlockReference)(Trans.GetObject(Selection.Value.OfType<SelectedObject>().First().ObjectId, OpenMode.ForRead).AcadObject);
    }
}

回答2:

this is a direct quote from autocad developer help

http://docs.autodesk.com/ACD/2013/ENU/index.html?url=files/GUID-CBECEDCF-3B4E-4DF3-99A0-47103D10DADD.htm,topicNumber=d30e724932

There is tons of documentation the AutoCAD .NET API.

you will need to have

[assembly: CommandClass(typeof(namespace.class))]

above your namespace if you want to be able to invoke this command from the command line after you NetLoad the .dll, if it is a classLibrary.

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;

[CommandMethod("SelectObjectsOnscreen")]
public static void SelectObjectsOnscreen()
{
  // Get the current document and database
  Document acDoc = Application.DocumentManager.MdiActiveDocument;
  Database acCurDb = acDoc.Database;

  // Start a transaction
  using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
  {
      // Request for objects to be selected in the drawing area
      PromptSelectionResult acSSPrompt = acDoc.Editor.GetSelection();

      // If the prompt status is OK, objects were selected
      if (acSSPrompt.Status == PromptStatus.OK)
      {
          SelectionSet acSSet = acSSPrompt.Value;

          // Step through the objects in the selection set
          foreach (SelectedObject acSSObj in acSSet)
          {
              // Check to make sure a valid SelectedObject object was returned
              if (acSSObj != null)
              {
                  // Open the selected object for write
                  Entity acEnt = acTrans.GetObject(acSSObj.ObjectId,
                                                   OpenMode.ForWrite) as Entity;

                  if (acEnt != null)
                  {
                      // Change the object's color to Green
                      acEnt.ColorIndex = 3;
                  }
              }
          }

          // Save the new object to the database
          acTrans.Commit();
      }

      // Dispose of the transaction
  }
}

来源：https://stackoverflow.com/questions/17272173/how-to-get-only-one-acadobject-by-selection-set

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autocad