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Exception.StackTrace Property

Gets a string representation of the immediate frames on the call stack.

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

Public Overridable ReadOnly Property StackTrace As String

Property Value

Type: System.String
A string that describes the immediate frames of the call stack.



The execution stack keeps track of all the methods that are in execution at a given instant. A trace of the method calls is called a stack trace. The stack trace listing provides a way to follow the call stack to the line number in the method where the exception occurs.

The StackTrace property returns the frames of the call stack that originate at the location where the exception was thrown. You can obtain information about additional frames in the call stack by creating a new instance of the System.Diagnostics.StackTrace class and using its StackTrace.ToString method.

The common language runtime (CLR) updates the stack trace whenever an exception is thrown in application code (by using the throw keyword). If the exception was rethrown in a method that is different than the method where it was originally thrown, the stack trace contains both the location in the method where the exception was originally thrown, and the location in the method where the exception was rethrown. If the exception is thrown, and later rethrown, in the same method, the stack trace only contains the location where the exception was rethrown and does not include the location where the exception was originally thrown.

The StackTrace property may not report as many method calls as expected because of code transformations, such as inlining, that occur during optimization.

Notes to Inheritors

The StackTrace property is overridden in classes that require control over the stack trace content or format.

By default, the stack trace is captured immediately before an exception object is thrown. Use Environment.StackTrace to get stack trace information when no exception is being thrown.

The following code example throws an Exception and then catches it and displays a stack trace using the StackTrace property.

' Example for the Exception.HelpLink, Exception.Source,
' Exception.StackTrace, and Exception.TargetSite properties.
Imports System
Imports Microsoft.VisualBasic

Namespace NDP_UE_VB

    ' Derive an exception; the constructor sets the HelpLink and 
    ' Source properties.
    Class LogTableOverflowException
        Inherits Exception

        Private Const overflowMessage As String = _
            "The log table has overflowed."

        Public Sub New( auxMessage As String, inner As Exception )
            MyBase.New( String.Format( "{0} - {1}", _
                overflowMessage, auxMessage ), inner )

            Me.HelpLink = ""
            Me.Source = "Exception_Class_Samples"

        End Sub ' New
    End Class ' LogTableOverflowException

    Class LogTable

        Public Sub New(numElements As Integer)
            logArea = New String(numElements) {}
            elemInUse = 0
        End Sub ' New

        Protected logArea() As String
        Protected elemInUse As Integer

        ' The AddRecord method throws a derived exception if 
        ' the array bounds exception is caught.
        Public Function AddRecord( newRecord As String ) As Integer

                Dim curElement as Integer = elemInUse
                logArea( elemInUse ) = newRecord
                elemInUse += 1
                Return curElement

            Catch ex As Exception
                Throw New LogTableOverflowException( _
                    String.Format( "Record ""{0}"" was not logged.", _
                        newRecord ), ex )
            End Try
        End Function ' AddRecord
    End Class ' LogTable

    Module OverflowDemo

        ' Create a log table and force an overflow.
        Sub Main( )
            Dim log As New LogTable( 4 )

            Console.WriteLine( "This example of " & vbCrLf & _
                "   Exception.Message, " & vbCrLf & _
                "   Exception.HelpLink, " & vbCrLf & _
                "   Exception.Source, " & vbCrLf & _
                "   Exception.StackTrace, and " & vbCrLf & _
                "   Exception.TargetSite " & vbCrLf & _
                "generates the following output." )

                Dim count As Integer = 0

                    log.AddRecord( _
                        String.Format( "Log record number {0}", count ) )
                    count += 1

            Catch ex As Exception
                Console.WriteLine( vbCrLf & _
                    "Message ---" & vbCrLf & ex.Message )
                Console.WriteLine( vbCrLf & _
                    "HelpLink ---" & vbCrLf & ex.HelpLink )
                Console.WriteLine( vbCrLf & _
                    "Source ---" & vbCrLf & ex.Source )
                Console.WriteLine( vbCrLf & _
                    "StackTrace ---" & vbCrLf & ex.StackTrace )
                Console.WriteLine( vbCrLf & "TargetSite ---" & _
                    vbCrLf & ex.TargetSite.ToString( ) )
            End Try
        End Sub ' Main

    End Module ' OverflowDemo
End Namespace ' NDP_UE_VB

' This example of
'    Exception.Message,
'    Exception.HelpLink,
'    Exception.Source,
'    Exception.StackTrace, and
'    Exception.TargetSite
' generates the following output.
' Message ---
' The log table has overflowed. - Record "Log record number 5" was not logged.
' HelpLink ---
' Source ---
' Exception_Class_Samples
' StackTrace ---
'    at NDP_UE_VB.LogTable.AddRecord(String newRecord)
'    at NDP_UE_VB.OverflowDemo.Main()
' TargetSite ---
' Int32 AddRecord(System.String)

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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