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UserData Property

Summary

Gets or sets the user-defined data of this AnnObject.

Syntax

C++

public virtual object UserData { get; set; }

  
Public Overridable Property UserData As Object

public: 
virtual property Object^ UserData { 
   Object^ get(); 
   void set (    Object^ ); 
}

Property Value

The user-defined data of this AnnObject.

Remarks

You can use this property to store any extra data with this AnnObject. However, to allow functionality that depends on serialization (such as loading/saving from file or memory, copy/paste to/from clipboard, undo/redo buffers, etc), you must make sure the data type you use with this property is serializable. For more information on serialization, refer to the System.SerializableAttribute and System.Runtime.Serialization.ISerializable interface.

Example

This example will use a user-defined class to store extra information with each annotation object.

using Leadtools; 
using Leadtools.Annotations; 
using Leadtools.Codecs; 
using Leadtools.WinForms; 
using Leadtools.Drawing; 
 
 
// This is the main method in your application to create a container 
private AnnContainer AnnObject_UserData() 
{ 
   // create the container and subclass to its Objects.ItemAdded event 
   AnnContainer container = new AnnContainer(); 
   container.Objects.ItemAdded += new EventHandler<RasterCollectionEventArgs<AnnObject>>(Objects_ItemAdded); 
 
   // Add an item to the container 
   AnnEllipseObject ellipse = new AnnEllipseObject(); 
   ellipse.Bounds = new AnnRectangle(100, 100, 100, 100, AnnUnit.Pixel); 
   ellipse.Pen = new AnnPen(Color.Green, new AnnLength(2, AnnUnit.Pixel)); 
   ellipse.Brush = new AnnSolidBrush(Color.Yellow); 
   ellipse.Name = "Ellipse"; 
   container.Objects.Add(ellipse); 
 
 
   return container; 
} 
 
// A private class in your application to store the user name as well as the date/time an annotation object was created. 
public class MyUserData 
{ 
   public MyUserData(string userName) 
   { 
      _userName = userName; 
      _dateCreated = DateTime.Now; 
   } 
 
   private string _userName; 
   public string UserName 
   { 
      get 
      { 
         return _userName; 
      } 
      set 
      { 
         _userName = value; 
      } 
   } 
 
   private DateTime _dateCreated; 
   public DateTime DateCreated 
   { 
      get 
      { 
         return _dateCreated; 
      } 
      set 
      { 
         _dateCreated = value; 
      } 
   } 
} 
 
void Objects_ItemAdded(object sender, RasterCollectionEventArgs<AnnObject> e) 
{ 
   // get the object 
   AnnObject obj = e.Item as AnnObject; 
 
   // store the current user name and date/time this object was created in the object 
   MyUserData userData = new MyUserData("MyUserName"); 
   obj.UserData = userData; 
}

Imports Leadtools 
Imports Leadtools.Annotations 
Imports Leadtools.Codecs 
Imports Leadtools.WinForms 
Imports Leadtools.Drawing 
 
 
' This is the main method in your application to create a container 
Private Function AnnObject_UserData() As AnnContainer 
   ' create the container and subclass to its Objects.ItemAdded event 
   Dim container As AnnContainer = New AnnContainer() 
   AddHandler container.Objects.ItemAdded, AddressOf Objects_ItemAdded 
 
   ' Add an item to the container 
   Dim ellipse As AnnEllipseObject = New AnnEllipseObject() 
   ellipse.Bounds = New AnnRectangle(100, 100, 100, 100, AnnUnit.Pixel) 
   ellipse.Pen = New AnnPen(Color.Green, New AnnLength(2, AnnUnit.Pixel)) 
   ellipse.Brush = New AnnSolidBrush(Color.Yellow) 
   ellipse.Name = "Ellipse" 
   container.Objects.Add(ellipse) 
 
 
   Return container 
End Function 
 
' A private class in your application to store the user name as well as the date/time an annotation object was created. 
Public Class MyUserData 
   Public Sub New(ByVal userName_Renamed As String) 
      _userName = userName_Renamed 
      _dateCreated = DateTime.Now 
   End Sub 
 
   Private _userName As String 
   Public Property UserName() As String 
      Get 
         Return _userName 
      End Get 
      Set(ByVal value As String) 
         _userName = value 
      End Set 
   End Property 
 
   Private _dateCreated As DateTime 
   Public Property DateCreated() As DateTime 
      Get 
         Return _dateCreated 
      End Get 
      Set(ByVal value As DateTime) 
         _dateCreated = value 
      End Set 
   End Property 
End Class 
 
Private Sub Objects_ItemAdded(ByVal sender As Object, ByVal e As RasterCollectionEventArgs(Of AnnObject)) 
   ' get the object 
   Dim obj As AnnObject = CType(IIf(TypeOf e.Item Is AnnObject, e.Item, Nothing), AnnObject) 
 
   ' store the current user name and date/time this object was created in the object 
   Dim userData As MyUserData = New MyUserData("MyUserName") 
   obj.UserData = userData 
End Sub

Requirements

Target Platforms

Reference

AnnObject Class

AnnObject Members

Help Version 19.0.2017.10.27

Leadtools.Annotations Assembly

Introduction

Getting Started

Namespaces

Leadtools.Annotations Namespace

Assemblies