CanBeNullAttribute Class

Indicates that the value of the marked element could be null sometimes, so the check for null is necessary before its usage

Object Model

Syntax

Visual Basic
C#

'Declaration
 
<AttributeUsageAttribute(ValidOn=AttributeTargets.Method Or  _
    AttributeTargets.Property Or  _
    AttributeTargets.Field Or  _
    AttributeTargets.Parameter Or  _
    AttributeTargets.Delegate, 
   AllowMultiple=False, 
   Inherited=True)>
Public NotInheritable Class CanBeNullAttribute 
   Inherits System.Attribute

'Usage
 
Dim instance As CanBeNullAttribute

[AttributeUsage(ValidOn=AttributeTargets.Method | 
    AttributeTargets.Property | 
    AttributeTargets.Field | 
    AttributeTargets.Parameter | 
    AttributeTargets.Delegate, 
   AllowMultiple=false, 
   Inherited=true)]
public sealed class CanBeNullAttribute : System.Attribute

Example

[CanBeNull] public object Test() { return null; }
public void UseTest() {
  var p = Test();
  var s = p.ToString(); // Warning: Possible 'System.NullReferenceException'
}

Inheritance Hierarchy

System.Object
System.Attribute
Miner.Desktop.DesignerExpress.Annotations.CanBeNullAttribute

Requirements

Target Platforms: Windows XP SP3 (32-bit and 64-bit), Windows 7 (32-bit and 64-bit)

Not all Operating Systems are supported on all products. Visit the ArcFM Solution Supported Versions page for full details.

Reference

CanBeNullAttribute Members
Miner.Desktop.DesignerExpress.Annotations Namespace