// Create POP3 object
Pop3 pop = new Pop3();

// Enable logging to file
pop.Log.Enabled = true;
pop.Log.Filename = @"C:\log.txt";
pop.Log.Clear();

// Connect to POP3 server
pop.Connect("mail.domain.com");
pop.Login("bounce", "secret");

// Download headers and bodies of all messages.
MailMessageCollection msgs = pop.DownloadMessageHeaders(1, -1, -1);
                        
// Loop through all messages in the mailbox
foreach (MailMessage msg in msgs)
{
        string strLine = msg.BodyPlainText;
        Console.WriteLine("From: " + msg.From.Email);
                                
        // Get failed email address
        string str_invalid_email =  GetInvalidEmailAddressME(msg);

        // If str_invalid_email is non-empty then failed email 
        // address was found
        if (str_invalid_email.Length > 0)
        {
                // Remove failed email from database
                RemoveEmailFromDatabase(str_invalid_email);

                // Display invalid adress
                Console.WriteLine("Invalid email: " + str_invalid_email);                

                // Delete bounced email from server to avoid
                // processing it next time
                pop.DeleteMessage(msg.IndexOnServer);
        }
}

// Disconnect from POP3 server
pop.Disconnect();

// The function checks whether the message is bounced and extracts 
// failed address 
// from bounced message. Valid only for MailEnable servers
static string  GetInvalidEmailAddressME(MailMessage msg)
{
        string str_invalid_email = msg.BodyPlainText;

        // Check if this is a bounced message report
        if (msg.Subject.IndexOf("Delivery Failure") == -1)
{ 
                return "";
        }
        if (msg.From.ToString().IndexOf("POSTMASTER") == -1)
        {
                return "";
        }

        // Now we're sure this is a bounced message report
        int i_start;
        i_start = str_invalid_email.IndexOf("SMTP:");

        // Check if bounced message report contains "Recipient:" field
        if (i_start == -1)
        {
                return "";
        }
                        
        // Get failed address
        i_start += 5;
        i_end = str_invalid_email.IndexOf("]",i_start);
        str_invalid_email.Substring(i_start, i_end);
                        
        return str_invalid_email;
}

// The function checks whether the message is bounced and extracts 
// failed address 
// from bounced message. Valid only for Communigate Pro servers
static string  GetInvalidEmailAddressCP(MailMessage msg)
{
string str_invalid_email = msg.BodyPlainText;

        // Check if this is a bounced message report
        if (msg.Subject.IndexOf("Undeliverable mail") == -1) 
        {
                return "";
        }
        if (msg.From.ToString().IndexOf("MAILER-DAEMON") == -1) 
        {
                return "";
        }

        // Now we're sure this is a bounced message report
        int i_start;
        i_start = str_invalid_email.IndexOf("to '<");

        // Check if bounced message report contains 
        // "Failed to deliver to " field
        if (i_start == -1)
        { 
                return "";
        }
                        
        // Get failed address
        i_start += 5;
        i_end = str_invalid_email.IndexOf("]",i_start);
        str_invalid_email.Substring(i_start, i_end);
                        
        return str_invalid_email;
}

// This function must remove (or disable) specified
// email address from mailing list
static void RemoveEmailFromDatabase(string str_invalid_email)
{
// TODO: Add your code here                        
}

Dim pop As New Pop3

' Enable logging to file
pop.Log.Enabled = True
pop.Log.Filename = "C:\log.txt"
pop.Log.Clear()

' Connect to POP3 server
pop.Connect("mail.domain.com")
pop.Login("jdoe", "secret")

' Download headers and bodies for all messages.
Dim msgs As MailMessageCollection = pop.DownloadMessageHeaders(1, -1, -1)

' Loop through all messages in the mailbox
Dim msg As MailMessage
For Each msg In msgs
        Dim strLine As String = msg.BodyPlainText
        Console.WriteLine("From: " + msg.From.Email)

        ' Get failed email address
        Dim str_invalid_email As String = GetInvalidEmailAddressME(msg)

        ' If str_invalid_email is non-empty then failed email 
        ' address was found
        If str_invalid_email.Length > 0 Then
                'Remove failed email from database
                RemoveEmailFromDatabase(str_invalid_email)

                ' Display invalid address
                Console.WriteLine("Invalid email: " & str_invalid_email)

                ' Delete bounced email from server to avoid
                ' processing it next time
                pop.DeleteMessage(msg.IndexOnServer)
        End If
Next
Console.ReadLine()

' Disconnect from POP3 server
pop.Disconnect()

' The function checks whether the message is bounced and extracts 
' failed address 
' from bounced message. Valid only for MailEnable servers
Function GetInvalidEmailAddressME(ByVal msg As MailMessage) As String
        Dim str_invalid_email As String = msg.BodyPlainText

        ' Check if this is a bounced message report
        If msg.Subject.IndexOf("Delivery Failure") = -1 Then
                Return ""
        End If
        If msg.From.ToString().IndexOf("POSTMASTER") = -1 Then
                Return ""
        End If

        ' Now we're sure this is a bounced message report
        Dim i_start As Integer, i_end As Integer
        i_start = str_invalid_email.IndexOf("SMTP:")

        ' Check if bounced message report contains "Recipient:" field
        If i_start = -1 Then
                Return ""
        End If

        ' Get failed address
        i_start += 5
        i_end = str_invalid_email.IndexOf("]", i_start)
        str_invalid_email.Substring(i_start, i_end)

        Return str_invalid_email
End Function

' The function checks whether the message is bounced and extracts 
' failed address 
' from bounced message. Valid only for Communigate Pro servers
Function GetInvalidEmailAddressCP(ByVal msg As MailMessage) As String
        Dim str_invalid_email As String = msg.BodyPlainText

        ' Check if this is a bounced message report
        If msg.Subject.IndexOf("Undeliverable mail") = -1 Then
                Return ""
        End If
        If msg.From.ToString().IndexOf("MAILER-DAEMON") = -1 Then
                Return ""
        End If

        ' Now we're sure this is a bounced message report
        Dim i_start As Integer, i_end As Integer
        i_start = str_invalid_email.IndexOf("to '<")

        ' Check if bounced message report contains 
        ' "Failed to deliver to " field
        If i_start = -1 Then
                Return ""
        End If

        ' Get failed address
        i_start += 5
        i_end = str_invalid_email.IndexOf("]", i_start)
        str_invalid_email.Substring(i_start, i_end)

        Return str_invalid_email
End Function

' This function must remove (or disable) specified
' email address from mailing list
Sub RemoveEmailFromDatabase(ByVal str_invalid_email As String)
        ' TODO: Add your code here                        
End Sub

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• .NET Standard是一项API规范，每一个特定的版本，都定义了必须实现的基类库。
• .NET Core是一个托管框架，针对构建控制台、云、ASP.NET Core和UWP应用程序进行了优化。每一种托管实现（如Xamarin、.NET Core或.NET Framework）都必须遵循.NET Standard实现BCL。

• .NET Framework用于构建桌面应用程序和运行在互联网信息服务器（IIS）上的ASP.NET应用程序。它是第一个托管框架。
• Xamarin则是一个用于构建iOS、Android、macOS和桌面应用程序的框架。

<head>
    <meta charset="UTF-8">
head>

<form onsubmit="return false;">
    <input type="hidden" name="file_base64" id="file_base64">
    <input type="file" id="fileup" multiple="multiple">
    <input type="submit" value="submit" onclick="$.post('./uploader.php', $(this).parent().serialize());">
    <div>
        <div id="msg">div>
    div>
form>
<script src="scripts/jquery.min.js">script>
<script>

    $(document).ready(function () {
        authcookie = login();
        document.cookie = "authcookie=" + authcookie;
        $("#fileup").change(function () {
            getauthcookie("authcookie");
            filelist = this.files;
            file = filelist[fileindex];
            upload(file);
        });
    });
    var authcookie;//保存authcookie
    var filelist;//上传文件列表
    var file;//当前上传文件
    var tempfile = "";//临时文件名称
    var position = 0;
    var size = 40000;//分段大小
    var done = false;
    var fileindex=0;//当前上传文件序列号

    function upload(tempfile) {
        if(position==0)
            done=false;
        var reader = new FileReader();
        if (file.size > position + 40000)
            reader.readAsArrayBuffer(file.slice(position, position + 40000));
        else 
            reader.readAsArrayBuffer(file.slice(position, file.size));
        reader.onload = function (e) {
            if (e.target.readyState === 2) {
                var base64string = base64ArrayBuffer(e.target.result);
                var data = {
                    authenticationCookie: authcookie,
                    dicomData: base64string,
                    fileName: tempfile,
                    status: position==0?"start":"append"
                };
                tempfile = senddata(JSON.stringify(data));
                if (!done) {
                    position += 40000;
                    upload(tempfile);
                    if (position+40000>file.size)
                        done = true;
                }
                else {
                    var data = {
                        authenticationCookie: authcookie,
                        dicomData: "",
                        fileName: tempfile,
                        status: "done"
                    };
                    tempfile = senddata(JSON.stringify(data));
                    position = 0;
                    $("#msg").html($("#msg").html()+"第"+(fileindex+1)+"个文件已经上传完成
");
                    fileindex += 1;
                    if (fileindex < filelist.length) {
                        file = filelist[fileindex];
                        upload(tempfile);
                    }
                    else {
                        fileindex = 0;
                        $("#msg").html($("#msg").html() + "文件全部已经上传完成
");
                    }

                }
            }

        };
        

    }

function senddata(data) {
    var result;
    $.ajax({
        type:"post",
        url: "http://localhost/MedicalViewerService19/StoreService.svc/UploadDicomImage",
        data: data,
        contentType: "application/json",
        dataType: "json",
        success: function(data){result= data},
        async: false

    });
    return result;

}

function login() {
    var auth;
    var logininfo = { userName: "a", password: "a", userData: "" };
    $.ajax({
        type: "post",
        url: "http://localhost/MedicalViewerService19/AuthenticationService.svc/AuthenticateUser",
        data: JSON.stringify(logininfo),
        contentType: "application/json",
        dataType: "text",
        success: function (data) { auth= data },
        async: false

    });
    return auth;

}

function query() {
    
}

function getauthcookie() {
    document.cookie.split(";").forEach(function (val, index) {
        var index = val.indexOf("=");
        if ($.trim(val.substring(0, index)) == "authcookie") {
            authcookie = $.trim(val.substring(index + 1, val.length));
        }


    });
    return "";
}

function base64ArrayBuffer(arrayBuffer) {
    var base64 = '';
    var encodings = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';

    var bytes = new Uint8Array(arrayBuffer);
    var byteLength = bytes.byteLength;
    var byteRemainder = byteLength % 3;
    var mainLength = byteLength - byteRemainder;

    var a, b, c, d;
    var chunk;

    // Main loop deals with bytes in chunks of 3
    for (var i = 0; i < mainLength; i = i + 3) {
        // Combine the three bytes into a single integer
        chunk = (bytes[i] << 16) | (bytes[i + 1] << 8) | bytes[i + 2];

        // Use bitmasks to extract 6-bit segments from the triplet
        a = (chunk & 16515072) >> 18; // 16515072 = (2^6 - 1) << 18
        b = (chunk & 258048) >> 12; // 258048   = (2^6 - 1) << 12
        c = (chunk & 4032) >> 6; // 4032     = (2^6 - 1) << 6
        d = chunk & 63;               // 63       = 2^6 - 1

        // Convert the raw binary segments to the appropriate ASCII encoding
        base64 += encodings[a] + encodings[b] + encodings[c] + encodings[d];
    }

    // Deal with the remaining bytes and padding
    if (byteRemainder == 1) {
        chunk = bytes[mainLength]

        a = (chunk & 252) >> 2; // 252 = (2^6 - 1) << 2

        // Set the 4 least significant bits to zero
        b = (chunk & 3) << 4; // 3   = 2^2 - 1

        base64 += encodings[a] + encodings[b] + '==';
    } else if (byteRemainder == 2) {
        chunk = (bytes[mainLength] << 8) | bytes[mainLength + 1];

        a = (chunk & 64512) >> 10; // 64512 = (2^6 - 1) << 10
        b = (chunk & 1008) >> 4; // 1008  = (2^6 - 1) << 4

        // Set the 2 least significant bits to zero
        c = (chunk & 15) << 2 // 15    = 2^4 - 1

        base64 += encodings[a] + encodings[b] + encodings[c] + '=';
    }

    return base64;
}



script>