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CallerLineNumberAttribute Class

.NET Framework 4.5

Allows you to obtain the line number in the source file at which the method is called.

System.Object
  System.Attribute
    System.Runtime.CompilerServices.CallerLineNumberAttribute

Namespace:  System.Runtime.CompilerServices
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
<AttributeUsageAttribute(AttributeTargets.Parameter, Inherited := False)> _
Public NotInheritable Class CallerLineNumberAttribute _
	Inherits Attribute

The CallerLineNumberAttribute type exposes the following members.

  NameDescription
Public methodSupported in .NET for Windows Store appsCallerLineNumberAttributeInitializes a new instance of the CallerLineNumberAttribute class.
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  NameDescription
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
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  NameDescription
Public methodSupported in .NET for Windows Store appsEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public methodSupported in .NET for Windows Store appsGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodSupported in .NET for Windows Store appsGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Public methodSupported in .NET for Windows Store appsToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Explicit interface implemetationPrivate method_Attribute.GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.InvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
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You apply the CallerLineNumber attribute to an optional parameter that has a default value. You must specify an explicit default value for the optional parameter. You can't apply this attribute to parameters that aren't specified as optional.

For more information, see Caller Information (C# and Visual Basic).

The following example shows how to use the CallerLineNumber attribute. On each call to the TraceMessage method, the caller information is substituted as an argument to the optional parameter.

' Imports System.Runtime.CompilerServices 
' Imports System.Diagnostics 

Private Sub DoProcessing()
    TraceMessage("Something happened.")
End Sub 

Public Sub TraceMessage(message As String,
        <CallerMemberName> Optional memberName As String = Nothing,
        <CallerFilePath> Optional sourcefilePath As String = Nothing,
        <CallerLineNumber()> Optional sourceLineNumber As Integer = 0)

    Trace.WriteLine("message: " & message)
    Trace.WriteLine("member name: " & memberName)
    Trace.WriteLine("source file path: " & sourcefilePath)
    Trace.WriteLine("source line number: " & sourceLineNumber)
End Sub 

' Sample output: 
'   message: Something happened. 
'   member name: DoProcessing 
'   source file path: C:\Users\username\Documents\Visual Studio 2012\Projects\CallerInfoVB\CallerInfoVB\Form1.vb 
'   source line number: 15

.NET Framework

Supported in: 4.5

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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