CODEWITHSUNDEEP
vb.netexceptionssisftpwebclient
Nicolaesse
Nicolaesse

Reputation: 2714

Handle exceptions in VB.NET SSIS script with WebClient (FTP download)

In SSIS I am using a VB.NET script task to download a file from an FTP folder.

The script is the following

Imports System
Imports System.Data
Imports Microsoft.SqlServer.Dts.Runtime
Imports System.Net

Public Class ScriptMain
    Public Sub Main()
        Dim objWebClient As WebClient = New WebClient()
        Dim strDownloadURL As String = "ftp://mydownloadhosting.com/myfolder/" + Dts.Variables("GetDate").Value.ToString() + "_daily.xml"
        Dim strFileName As String = Dts.Variables("WorkingFile").Value.ToString()
        Dim wp As WebProxy = New WebProxy("my.proxy.local", 1234)

        objWebClient.Proxy = wp
        objWebClient.Credentials = New System.Net.NetworkCredential("username", "password")
        objWebClient.DownloadFile(strDownloadURL, strFileName)

        Dts.TaskResult = Dts.Results.Success
    End Sub
End Class

it works correctly but my target is to manage the exception, in particular to discriminate between:

I have made some research about how to manage exception with WebClient() and I have found these:

which they give different forms of the following:

try
{
    // try to download file here
}
catch (WebException ex)
{
    if (ex.Status == WebExceptionStatus.ProtocolError)
    {
        if (((HttpWebResponse)ex.Response).StatusCode == HttpStatusCode.NotFound)
        {
            // handle the 404 here
        }
    }
    else if (ex.Status == WebExceptionStatus.NameResolutionFailure)
    {
        // handle name resolution failure
    }
}

The main problem is that my code is in VB.NET and all the posted answered are written in C#, how can make a try/catch construct to handle an exception in my code?

Upvotes: 2

Views: 761

Answers (2)

Martin Prikryl
Martin Prikryl

Reputation: 202504

An equivalent code in VB.NET is:

Try
    ' try to download file here
Catch ex As WebException
    If ex.Status = WebExceptionStatus.ProtocolError Then
        If DirectCast(ex.Response, HttpWebResponse).StatusCode = HttpStatusCode.NotFound Then
            ' // handle the 404 here
        End If
    ElseIf ex.Status = WebExceptionStatus.NameResolutionFailure Then
        ' handle name resolution failure
    End If
End Try

Though the above/your code is for HTTP, not for FTP. FTP has different status codes.

For FTP, use:

For some FTP examples, see:

Upvotes: 2

Hadi
Hadi

Reputation: 37348

There are many C# to VB.NET converters that you can refer to when you need to convert simple codes:

The equivalent VB.NET code is:

Imports System
Imports System.Data
Imports Microsoft.SqlServer.Dts.Runtime
Imports System.Net

Public Class ScriptMain
    Public Sub Main()

        Try

            Dim objWebClient As WebClient = New WebClient()
            Dim strDownloadURL As String = "ftp://mydownloadhosting.com/myfolder/" + Dts.Variables("GetDate").Value.ToString() + "_daily.xml"
            Dim strFileName As String = Dts.Variables("WorkingFile").Value.ToString()
            Dim wp As WebProxy = New WebProxy("my.proxy.local", 1234)

            objWebClient.Proxy = wp
            objWebClient.Credentials = New System.Net.NetworkCredential("username", "password")
            objWebClient.DownloadFile(strDownloadURL, strFileName)

            Dts.TaskResult = Dts.Results.Success

        Catch ex As WebException

            If ex.Status = WebExceptionStatus.ProtocolError Then

                If (CType(ex.Response, HttpWebResponse)).StatusCode = HttpStatusCode.NotFound Then

                   'handle the 404 here

                End If
            ElseIf ex.Status = WebExceptionStatus.NameResolutionFailure Then

                'handle name resolution failure

            End If

            Dts.TaskResult = Dts.Results.Failure

        End Try


    End Sub
End Class

Upvotes: 0

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