FileExistsCompleted Event

Shows how to use FileExistsAsync method to asynchronously determine whether a file exists on an FTP server (Task-based approach).

using System;
using ComponentPro.IO;
using ComponentPro.Net;
using ComponentPro;

...

// Create a new class instance.
Ftp client = new Ftp();

// Connect to the FTP server.
client.Connect("server");

// Authenticate.
client.Authenticate("test", "test");

// ... 
 
// Determine whether file 'myFile.dat' exists or not. 
bool exists = await client.FileExistsAsync("/myFile.dat");

// ... 
 
if (exists)
    Console.WriteLine("File '/myFile.dat' exists");
else 
    Console.WriteLine("File '/myFile.dat' does not exist");

// ... 
 
// Determine whether at least one file with '.cs' extension exists or not.
exists = await client.FileExistsAsync("/", new NameSearchCondition("*.cs"));

if (exists)
    Console.WriteLine("Found one or more '.cs' files");
else 
    Console.WriteLine("No '.cs' files found");

// Disconnect.
client.Disconnect();

Imports ComponentPro.IO
Imports ComponentPro.Net
Imports ComponentPro

...

' Create a new class instance. 
Dim client As New Ftp()

' Connect to the FTP server.
client.Connect("server")

' Authenticate.
client.Authenticate("test", "test")

' ... 
 
' Determine whether file 'myFile.dat' exists or not. 
Dim exists As Boolean = Await client.FileExistsAsync("/myFile.dat")

' ... 
 
If exists Then 
    Console.WriteLine("File '/myFile.dat' exists")
Else 
    Console.WriteLine("File '/myFile.dat' does not exist")
End If 
 
' ... 
 
' Determine whether at least one file with '.cs' extension exists or not.
exists = Await client.FileExistsAsync("/", New NameSearchCondition("*.cs"))

If exists Then 
    Console.WriteLine("Found one or more '.cs' files")
Else 
    Console.WriteLine("No '.cs' files found")
End If 
 
' Disconnect.
client.Disconnect()

Shows how to use FileExistsAsync method to asynchronously determine whether a file exists on an FTP server (Event-based approach).

using System;
using ComponentPro.IO;
using ComponentPro.Net;
using ComponentPro;

...

static void Main()
{
    // Create a new class instance. 
    Ftp client = new Ftp();

    // Connect to the FTP server. 
    client.Connect("server");

    // Authenticate. 
    client.Authenticate("test", "test");

    // ... 
 
    // Register an event handler. 
    client.FileExistsCompleted += client_FileExistsCompleted;

    // Determine whether file 'myFile.dat' exists or not. 
    client.FileExistsAsync("/myFile.dat");

    // ... 
 
    // Determine whether at least one file with '.cs' extension exists or not. 
    client.FileExistsAsync("/", new NameSearchCondition("*.cs"));

    // ... 
 
    // Disconnect. 
    client.Disconnect();
}

static void client_FileExistsCompleted(object sender, ExtendedAsyncCompletedEventArgs<bool> e)
{
    // Ftp client = (Ftp)sender; 
    if (e.Error != null)
        Console.WriteLine("Error: " + e.Error.ToString());
    else 
    {
        bool exists = e.Result;

        if (exists)
            Console.WriteLine("File '/myFile.dat' exists");
        else 
            Console.WriteLine("File '/myFile.dat' does not exist");
    }
}

Imports ComponentPro.IO
Imports ComponentPro.Net
Imports ComponentPro

...

Shared Sub Main()
    ' Create a new class instance. 
    Dim client As New Ftp()

    ' Connect to the FTP server. 
    client.Connect("server")

    ' Authenticate. 
    client.Authenticate("test", "test")

    ' ... 
 
    ' Register an event handler. 
    AddHandler client.FileExistsCompleted, AddressOf client_FileExistsCompleted

    ' Determine whether file 'myFile.dat' exists or not. 
    client.FileExistsAsync("/myFile.dat")

    ' ... 
 
    ' Determine whether at least one file with '.cs' extension exists or not. 
    client.FileExistsAsync("/", New NameSearchCondition("*.cs"))

    ' ... 
 
    ' Disconnect. 
    client.Disconnect()
End Sub 
 
Private Shared Sub client_FileExistsCompleted(ByVal sender As Object, ByVal e As ExtendedAsyncCompletedEventArgs(Of Boolean))
    ' Ftp client = (Ftp)sender; 
    If e.Error IsNot Nothing Then 
        Console.WriteLine("Error: " & e.Error.ToString())
    Else 
        Dim exists As Boolean = e.Result

        If exists Then 
            Console.WriteLine("File '/myFile.dat' exists")
        Else 
            Console.WriteLine("File '/myFile.dat' does not exist")
        End If 
    End If 
End Sub

Shows how to use FileExistsAsync method to asynchronously determine whether a file exists on an SFTP server (Task-based approach).

using System;
using ComponentPro.IO;
using ComponentPro.Net;
using ComponentPro;

...

// Create a new class instance.
Sftp client = new Sftp();

// Connect to the SFTP server.
client.Connect("server");

// Authenticate.
client.Authenticate("test", "test");

// ... 
 
// Determine whether file 'myFile.dat' exists or not. 
bool exists = await client.FileExistsAsync("/myFile.dat");

// ... 
 
if (exists)
    Console.WriteLine("File '/myFile.dat' exists");
else 
    Console.WriteLine("File '/myFile.dat' does not exist");

// ... 
 
// Determine whether at least one file with '.cs' extension exists or not.
exists = await client.FileExistsAsync("/", new NameSearchCondition("*.cs"));

if (exists)
    Console.WriteLine("Found one or more '.cs' files");
else 
    Console.WriteLine("No '.cs' files found");

// Disconnect.
client.Disconnect();

Imports ComponentPro.IO
Imports ComponentPro.Net
Imports ComponentPro

...

' Create a new class instance. 
Dim client As New Sftp()

' Connect to the SFTP server.
client.Connect("server")

' Authenticate.
client.Authenticate("test", "test")

' ... 
 
' Determine whether file 'myFile.dat' exists or not. 
Dim exists As Boolean = Await client.FileExistsAsync("/myFile.dat")

' ... 
 
If exists Then 
    Console.WriteLine("File '/myFile.dat' exists")
Else 
    Console.WriteLine("File '/myFile.dat' does not exist")
End If 
 
' ... 
 
' Determine whether at least one file with '.cs' extension exists or not.
exists = Await client.FileExistsAsync("/", New NameSearchCondition("*.cs"))

If exists Then 
    Console.WriteLine("Found one or more '.cs' files")
Else 
    Console.WriteLine("No '.cs' files found")
End If 
 
' Disconnect.
client.Disconnect()

Shows how to use FileExistsAsync method to asynchronously determine whether a file exists on an SFTP server (Event-based approach).

using System;
using ComponentPro.IO;
using ComponentPro.Net;
using ComponentPro;

...

static void Main()
{
    // Create a new class instance. 
    Sftp client = new Sftp();

    // Connect to the SFTP server. 
    client.Connect("server");

    // Authenticate. 
    client.Authenticate("test", "test");

    // ... 
 
    // Register an event handler. 
    client.FileExistsCompleted += client_FileExistsCompleted;

    // Determine whether file 'myFile.dat' exists or not. 
    client.FileExistsAsync("/myFile.dat");

    // ... 
 
    // Determine whether at least one file with '.cs' extension exists or not. 
    client.FileExistsAsync("/", new NameSearchCondition("*.cs"));

    // ... 
 
    // Disconnect. 
    client.Disconnect();
}

static void client_FileExistsCompleted(object sender, ExtendedAsyncCompletedEventArgs<bool> e)
{
    // Sftp client = (Sftp)sender; 
    if (e.Error != null)
        Console.WriteLine("Error: " + e.Error.ToString());
    else 
    {
        bool exists = e.Result;

        if (exists)
            Console.WriteLine("File '/myFile.dat' exists");
        else 
            Console.WriteLine("File '/myFile.dat' does not exist");
    }
}

Imports ComponentPro.IO
Imports ComponentPro.Net
Imports ComponentPro

...

Shared Sub Main()
    ' Create a new class instance. 
    Dim client As New Sftp()

    ' Connect to the SFTP server. 
    client.Connect("server")

    ' Authenticate. 
    client.Authenticate("test", "test")

    ' ... 
 
    ' Register an event handler. 
    AddHandler client.FileExistsCompleted, AddressOf client_FileExistsCompleted

    ' Determine whether file 'myFile.dat' exists or not. 
    client.FileExistsAsync("/myFile.dat")

    ' ... 
 
    ' Determine whether at least one file with '.cs' extension exists or not. 
    client.FileExistsAsync("/", New NameSearchCondition("*.cs"))

    ' ... 
 
    ' Disconnect. 
    client.Disconnect()
End Sub 
 
Private Shared Sub client_FileExistsCompleted(ByVal sender As Object, ByVal e As ExtendedAsyncCompletedEventArgs(Of Boolean))
    ' Sftp client = (Sftp)sender; 
    If e.Error IsNot Nothing Then 
        Console.WriteLine("Error: " & e.Error.ToString())
    Else 
        Dim exists As Boolean = e.Result

        If exists Then 
            Console.WriteLine("File '/myFile.dat' exists")
        Else 
            Console.WriteLine("File '/myFile.dat' does not exist")
        End If 
    End If 
End Sub