2015년 9월 21일 월요일

[ C# ] 날짜 경과일 계산

•[ C# ]  날짜 경과일 계산
•
•(EndDate - StartDate).TotalDays
•

•http://stackoverflow.com/questions/1607336/calculate-difference-between-two-dates-number-of-days
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[ C# ] stream에서 byte array만들기

[ C# ]  stream에서 byte array만들기
public static byte[] ReadFully(Stream input)
{
    byte[] buffer = new byte[16*1024];
    using (MemoryStream ms = new MemoryStream())
    {
        int read;
        while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
        {
            ms.Write(buffer, 0, read);
        }
        return ms.ToArray();
    }
}

http://stackoverflow.com/questions/221925/creating-a-byte-array-from-a-stream
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[ C# ] file 사용여부 체크

[ C# ]  file 사용여부 체크
try
{
   using (Stream stream = new FileStream("MyFilename.txt", FileMode.Open))
   {
        // File/Stream manipulating code here
   }
} catch {
  //check here why it failed and ask user to retry if the file is in use.
}


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[ C# ] Dictionary sort 하기

[ C# ]  Dictionary sort 하기
List<KeyValuePair<string, string>> myList = aDictionary.ToList();
myList.Sort(
    delegate(KeyValuePair<string, string> firstPair,
    KeyValuePair<string, string> nextPair)
    {
        return firstPair.Value.CompareTo(nextPair.Value);
    }
);

http://stackoverflow.com/questions/289/how-do-you-sort-a-dictionary-by-value
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[ C# ] Base Constructor부르기

[ C# ]  Base Constructor부르기
public class MyExceptionClass : Exception
{
    public MyExceptionClass(string message, string extrainfo) : base(message)
    {
        //other stuff here
    }

}
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[ C# ] enum으로 for 돌리기

[ C# ] enum으로 for 돌리기
public enum Foos
{
    A,
    B,
    C
}
foreach(Foos foo in Enum.GetValues(typeof(Foos)))


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[ C# ] enum에서 int

public enum Question
{
    Role = 2,
    ProjectFunding = 3,
    TotalEmployee = 4,
    NumberOfServers = 5,
    TopBusinessConcern = 6
}

int something = (int)Question.Role;
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[ C# ] URL 결합

•[ C# ]   URL 결합
•
•Uri baseUri = new Uri("http://www.contoso.com");
•Uri myUri = new Uri(baseUri, "catalog/shownew.htm");
•

•http://stackoverflow.com/questions/372865/path-combine-for-urls
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[ C# ] 다수 Exception처리

[ C# ] 다수 Exception처리
catch (Exception ex)           
{               
    if (ex is FormatException || ex is OverflowException)
    {
        WebId = Guid.Empty;
        return;
    }
    throw;
}

http://stackoverflow.com/questions/136035/catch-multiple-exceptions-at-once
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[ C# ] 상대시간 계산

 [ C# ]  상대적 시간 계산
2시간전, 3일전 등등 구하기
const int SECOND = 1;
const int MINUTE = 60 * SECOND;
const int HOUR = 60 * MINUTE;
const int DAY = 24 * HOUR;
const int MONTH = 30 * DAY;
var ts = new TimeSpan(DateTime.UtcNow.Ticks - yourDate.Ticks);
double delta = Math.Abs(ts.TotalSeconds);
if (delta < 1 * MINUTE)
{
  return ts.Seconds == 1 ? "one second ago" : ts.Seconds + " seconds ago";
}
if (delta < 2 * MINUTE)
{
  return "a minute ago";
}
if (delta < 45 * MINUTE)
{
  return ts.Minutes + " minutes ago";
}
if (delta < 90 * MINUTE)
{
  return "an hour ago";
}
if (delta < 24 * HOUR)
{
  return ts.Hours + " hours ago";
}
if (delta < 48 * HOUR)
{
  return "yesterday";
}
if (delta < 30 * DAY)
{
  return ts.Days + " days ago";
}
if (delta < 12 * MONTH)
{
  int months = Convert.ToInt32(Math.Floor((double)ts.Days / 30));
  return months <= 1 ? "one month ago" : months + " months ago";
}
else
{
  int years = Convert.ToInt32(Math.Floor((double)ts.Days / 365));
  return years <= 1 ? "one year ago" : years + " years ago";

}
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[ C# ] 공짜 Control 모음

• [ C# ]  공짜 Control 모음
•
•아래 사이트에 나열되어 있으니 참고
•

•http://stackoverflow.com/questions/361271/best-free-controls-for-net
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[ C# ] 알파벳 Random 생성

 [ C# ] 알파벳 Random 생성
var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
var random = new Random();
var result = new string(
    Enumerable.Repeat(chars, 8)
              .Select(s => s[random.Next(s.Length)])
              .ToArray());

http://stackoverflow.com/questions/1344221/how-can-i-generate-random-alphanumeric-strings-in-c
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[ C# ] 파일 stream 저장

 [ C# ]  파일 stream 저장
var fileStream = File.Create("C:\\Path\\To\\File");
myOtherObject.InputStream.Seek(0, SeekOrigin.Begin);
myOtherObject.InputStream.CopyTo(fileStream);
fileStream.Close();
Or with the using syntax:
using (var fileStream = File.Create("C:\\Path\\To\\File"))
{
    myOtherObject.InputStream.Seek(0, SeekOrigin.Begin);
    myOtherObject.InputStream.CopyTo(fileStream);
}

http://stackoverflow.com/questions/411592/how-do-i-save-a-stream-to-a-file-in-c
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[ C# ] 나이계산

[ C# ]  나이계산
DateTime today = DateTime.Today;
int age = today.Year - bday.Year;
if (bday > today.AddYears(-age)) age--;

http://stackoverflow.com/questions/9/how-do-i-calculate-someones-age-in-c
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[ C# ] Demical, Float, Double차이점

•Demical, Float, Double차이점
•
•Float - 7 digits (32 bit)
•
•Double-15-16 digits (64 bit)
•
•Decimal -28-29 significant digits (128 bit)
•

•http://stackoverflow.com/questions/618535/difference-between-decimal-float-and-double-in-net
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[ C# ] windows7에서 administrator 권한으로 강제 실행

•[ C# ]  windows7에서 administrator 권한으로 강제 실행
•
•<requestedExecutionLevel level="requireAdministrator" uiAccess="false" />
•

•http://stackoverflow.com/questions/2818179/how-to-force-my-net-app-to-run-as-administrator-on-windows-7
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[ C# ] HTTPWebrequest를 이용하여 파일 업로드

HTTPWebrequest를 이용하여 파일 업로드
public static void HttpUploadFile(string url, string file, string paramName, string contentType, NameValueCollection nvc) {
        log.Debug(string.Format("Uploading {0} to {1}", file, url));
        string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
        byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
        HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(url);
        wr.ContentType = "multipart/form-data; boundary=" + boundary;
        wr.Method = "POST";
        wr.KeepAlive = true;
        wr.Credentials = System.Net.CredentialCache.DefaultCredentials;
        Stream rs = wr.GetRequestStream();
        string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";
        foreach (string key in nvc.Keys)
        {
            rs.Write(boundarybytes, 0, boundarybytes.Length);
            string formitem = string.Format(formdataTemplate, key, nvc[key]);
            byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
            rs.Write(formitembytes, 0, formitembytes.Length);
        }
        rs.Write(boundarybytes, 0, boundarybytes.Length);
        string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: {2}\r\n\r\n";
        string header = string.Format(headerTemplate, paramName, file, contentType);
        byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
        rs.Write(headerbytes, 0, headerbytes.Length);
        FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);
        byte[] buffer = new byte[4096];
        int bytesRead = 0;
        while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0) {
            rs.Write(buffer, 0, bytesRead);
        }
        fileStream.Close();
        byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
        rs.Write(trailer, 0, trailer.Length);
        rs.Close();
        WebResponse wresp = null;
        try {
            wresp = wr.GetResponse();
            Stream stream2 = wresp.GetResponseStream();
            StreamReader reader2 = new StreamReader(stream2);
            log.Debug(string.Format("File uploaded, server response is: {0}", reader2.ReadToEnd()));
        } catch(Exception ex) {
            log.Error("Error uploading file", ex);
            if(wresp != null) {
                wresp.Close();
                wresp = null;
            }
        } finally {
            wr = null;
        }
    }


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[ C# ] String 스트링 암호화 복호화

String스트링 암호화 복호화
public class Crypto
{
    private static byte[] _salt = Encoding.ASCII.GetBytes("o6806642kbM7c5");
    /// <summary>
    /// Encrypt the given string using AES.  The string can be decrypted using
    /// DecryptStringAES().  The sharedSecret parameters must match.
    /// </summary>
    /// <param name="plainText">The text to encrypt.</param>
    /// <param name="sharedSecret">A password used to generate a key for encryption.</param>
    public static string EncryptStringAES(string plainText, string sharedSecret)
    {
        if (string.IsNullOrEmpty(plainText))
            throw new ArgumentNullException("plainText");
        if (string.IsNullOrEmpty(sharedSecret))
            throw new ArgumentNullException("sharedSecret");
        string outStr = null;                       // Encrypted string to return
        RijndaelManaged aesAlg = null;              // RijndaelManaged object used to encrypt the data.
        try
        {
            // generate the key from the shared secret and the salt
            Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(sharedSecret, _salt);
            // Create a RijndaelManaged object
            aesAlg = new RijndaelManaged();
            aesAlg.Key = key.GetBytes(aesAlg.KeySize / 8);
            // Create a decryptor to perform the stream transform.
            ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
            // Create the streams used for encryption.
            using (MemoryStream msEncrypt = new MemoryStream())
            {
                // prepend the IV
                msEncrypt.Write(BitConverter.GetBytes(aesAlg.IV.Length), 0, sizeof(int));
                msEncrypt.Write(aesAlg.IV, 0, aesAlg.IV.Length);
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                {
                    using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                    {
                        //Write all data to the stream.
                        swEncrypt.Write(plainText);
                    }
                }
                outStr = Convert.ToBase64String(msEncrypt.ToArray());
            }
        }
        finally
        {
            // Clear the RijndaelManaged object.
            if (aesAlg != null)
                aesAlg.Clear();
        }
        // Return the encrypted bytes from the memory stream.
        return outStr;
    }
    /// <summary>
    /// Decrypt the given string.  Assumes the string was encrypted using
    /// EncryptStringAES(), using an identical sharedSecret.
    /// </summary>
    /// <param name="cipherText">The text to decrypt.</param>
    /// <param name="sharedSecret">A password used to generate a key for decryption.</param>
    public static string DecryptStringAES(string cipherText, string sharedSecret)
    {
        if (string.IsNullOrEmpty(cipherText))
            throw new ArgumentNullException("cipherText");
        if (string.IsNullOrEmpty(sharedSecret))
            throw new ArgumentNullException("sharedSecret");
        // Declare the RijndaelManaged object
        // used to decrypt the data.
        RijndaelManaged aesAlg = null;
        // Declare the string used to hold
        // the decrypted text.
        string plaintext = null;
        try
        {
            // generate the key from the shared secret and the salt
            Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(sharedSecret, _salt);
            // Create the streams used for decryption.               
            byte[] bytes = Convert.FromBase64String(cipherText);
            using (MemoryStream msDecrypt = new MemoryStream(bytes))
            {
                // Create a RijndaelManaged object
                // with the specified key and IV.
                aesAlg = new RijndaelManaged();
                aesAlg.Key = key.GetBytes(aesAlg.KeySize / 8);
                // Get the initialization vector from the encrypted stream
                aesAlg.IV = ReadByteArray(msDecrypt);
                // Create a decrytor to perform the stream transform.
                ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
                using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                {
                    using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                        // Read the decrypted bytes from the decrypting stream
                        // and place them in a string.
                        plaintext = srDecrypt.ReadToEnd();
                }
            }
        }
        finally
        {
            // Clear the RijndaelManaged object.
            if (aesAlg != null)
                aesAlg.Clear();
        }
        return plaintext;
    }
    private static byte[] ReadByteArray(Stream s)
    {
        byte[] rawLength = new byte[sizeof(int)];
        if (s.Read(rawLength, 0, rawLength.Length) != rawLength.Length)
        {
            throw new SystemException("Stream did not contain properly formatted byte array");
        }
        byte[] buffer = new byte[BitConverter.ToInt32(rawLength, 0)];
        if (s.Read(buffer, 0, buffer.Length) != buffer.Length)
        {
            throw new SystemException("Did not read byte array properly");
        }
        return buffer;
    }
}

http://stackoverflow.com/questions/202011/encrypt-and-decrypt-a-string
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