CODEWITHSUNDEEP
c#vb.net
DennisL
DennisL

Reputation: 333

Return type of Exception StackTrace

Hi I am writing C# codes from legacy VB Codes, I have a function:

Public Shared Sub logError(ByVal ex As Exception, ByVal additionalInfo As String) 
    Dim messagestr As String
    If ex.StackTrace.Length > 0 Then
        For Each stackTrace As String In ex.StackTrace
             messagestr &= stackTrace
        Next
    End If

I converted the for loop as:

foreach (string stackTrace in ex.StackTrace)
{
      messagestr += stackTrace;
}

There is an error message under 'foreach': "Cannot convert type 'char' to 'string'.

It's quite weird as I read the StackTrace from MSDN that it returns a string. So I don't know why there is a for loop in the legacy VB codes. Also, I don't where the 'char' comes from.

I think I am complete lost in this area. Can anybody help me out?

Upvotes: 3

Views: 644

Answers (3)

Feriloo
Feriloo

Reputation: 432

The return type of ex.StackTrace is a string. The object that you will get by iterating over a string is char not another string. So you foreach loop must be:

foreach (char stackTrace in ex.StackTrace)
{

}

Or simply append stack trace to your string:

messagestr += ex.StackTrace;

If you want to get all function calls separately use this code to split your string into lines:

var stackLines = ex.StackTrace.Split('\n')

Upvotes: 2

Trung Duong
Trung Duong

Reputation: 3475

StackTrace is string property of Exception, so if you loop through its member using foreach, its member should be character data type (char). You could simply convert to 

If (ex.StackTrace.Length > 0) 
{
    messagestr += ex.StackTrace;
}

Upvotes: 1

sujith karivelil
sujith karivelil

Reputation: 29026

According to the documentation StackTrace Gets a string representation of the immediate frames on the call stack.

So when you iterate a string which will actually iterate through its characters, this is happening in your case.

Where as in VB it Represents a stack trace, which is an ordered collection of one or more stack frames. so when you iterate it iterates through the frames

Upvotes: 1

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