How can I get the line number which threw exception

Question

In a catch block  how can I get the line number which threw an exception

User · Answer

Simple way  use the Exception ToString   function  it will return the line after the exception description   You can also check the program debug database as it contains debug info logs about the whole application

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I added an extension to Exception which returns the line  column  method   filename and message   public static class Extensions       public static string ExceptionInfo this Exception exception                 StackFrame stackFrame    new StackTrace exception  true   GetFrame 0           return string Format  At line  0  column  1  in  2    3   4  3  5                 stackFrame GetFileLineNumber    stackFrame GetFileColumnNumber               stackFrame GetMethod    Environment NewLine  stackFrame GetFileName               exception Message

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If you need the line number for more than just the formatted stack trace you get from Exception StackTrace  you can use the StackTrace class    try       throw new Exception      catch  Exception ex           Get stack trace for the exception with source file information     var st   new StackTrace ex  true          Get the top stack frame     var frame   st GetFrame 0          Get the line number from the stack frame     var line   frame GetFileLineNumber        Note that this will only work if there is a pdb file available for the assembly

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I tried using the solution By  davy-c but had an Exception  System FormatException   Input string was not in a correct format     this was due to there still being text past the line number  I modified the code he posted and came up with    int line   Convert ToInt32 objErr ToString   Substring objErr ToString   IndexOf  line    Substring 0  objErr ToString   Substring objErr ToString   IndexOf  line    ToString   IndexOf   r n    Replace  line            This works for me in VS2017 C

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Working for me   var st   new StackTrace e  true       Get the bottom stack frame var frame   st GetFrame st FrameCount - 1      Get the line number from the stack frame var line   frame GetFileLineNumber    var method   frame GetMethod   ReflectedType FullName  var path   frame GetFileName

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In Global resx file there is an event called Application Error  it fires whenever an error occurs  you can easily get any information about the error and send it to a bug tracking e-mail   Also i think all u need to do is to compile the global resx and add its dll s  2 dlls  to your bin folder and it will work

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Update to the answer          Get stack trace for the exception with source file information     var st   new StackTrace ex  true          Get the top stack frame     var frame   st GetFrame st FrameCount-1          Get the line number from the stack frame     var line   frame GetFileLineNumber

User · Answer

You could include  PDB symbol files associated to the assembly which contain metadata information and when an exception is thrown it will contain full information in the stacktrace of where this exception originated  It will contain line numbers of each method in the stack

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Extension Method  static class ExceptionHelpers       public static int LineNumber this Exception ex                int n          int i   ex StackTrace LastIndexOf               if  i  gt  -1                        string s   ex StackTrace Substring i   1               if  int TryParse s  out n                   return n                    return -1            Usage  try       throw new Exception  A new error happened      catch  Exception ex          If error in exception LineNumber   will be -1     System Diagnostics Debug WriteLine       ex LineNumber            ex Message

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If you don t have the  PBO file   C   public int GetLineNumber Exception ex        var lineNumber   0      const string lineSearch     line        var index   ex StackTrace LastIndexOf lineSearch       if  index    -1                var lineNumberText   ex StackTrace Substring index   lineSearch Length           if  int TryParse lineNumberText  out lineNumber                                 return lineNumber      Vb net  Public Function GetLineNumber ByVal ex As Exception      Dim lineNumber As Int32   0     Const lineSearch As String     line       Dim index   ex StackTrace LastIndexOf lineSearch      If index  lt  gt  -1 Then         Dim lineNumberText   ex StackTrace Substring index   lineSearch Length          If Int32 TryParse lineNumberText  lineNumber  Then         End If     End If     Return lineNumber End Function   Or as an extentions on the Exception class  public static class MyExtensions       public static int LineNumber this Exception ex                var lineNumber   0          const string lineSearch     line            var index   ex StackTrace LastIndexOf lineSearch           if  index    -1                        var lineNumberText   ex StackTrace Substring index   lineSearch Length               if  int TryParse lineNumberText  out lineNumber                                                 return lineNumber

User · Answer

Check this one      StackTrace st   new StackTrace ex  true     Get the first stack frame StackFrame frame   st GetFrame 0      Get the file name string fileName   frame GetFileName       Get the method name string methodName   frame GetMethod   Name     Get the line number from the stack frame int line   frame GetFileLineNumber       Get the column number int col   frame GetFileColumnNumber

[c#] How can I get the line number which threw exception?

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