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There are several examples of this to be found in articles at CodeProject, including this[^] framework to scrape data off a website using GET or POST.
/ravi
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#region HttpPost
protected string HttpPost(string url_, string contents_, bool useCredentials_, NetworkCredential creds_)
{
bool isSuccess = false;
int noOfRetry = 0;
string response = string.Empty;
try
{
WriteToLog(string.Format("Starting HTTPPost Publishing message {0} \r\n {1}", url_, contents_));
while (!isSuccess && noOfRetry < m_noOfRetry)
{
WriteToLog("HTTPPost " + "Success Status :" + isSuccess.ToString() + " Retry Count: " + noOfRetry.ToString());
Uri url = new Uri(url_);
HttpWebRequest _webRequest = (HttpWebRequest)WebRequest.Create(url);
_webRequest.Timeout = 400000000;
_webRequest.Method = "POST";
_webRequest.ContentType = "text/xml; charset=ISO-8859-1";
_webRequest.KeepAlive = true;
_webRequest.Credentials = CredentialCache.DefaultNetworkCredentials;
if (useCredentials_)
{
string password = string.Empty;
string username = string.Empty;
//if no credentails provided then use
if (creds_ == null)
{
password = ConfigurationManager.AppSettings["password"] == null ?
null : ConfigurationManager.AppSettings["password"].ToString();
username = ConfigurationManager.AppSettings["user"] == null ?
null : ConfigurationManager.AppSettings["user"].ToString();
if (password == null || username == null)
{
WriteToLog(SMSConstants.INCOMPLETE_SMSGATEWAY_INFORMATION);
throw new Exception(SMSConstants.INCOMPLETE_SMSGATEWAY_INFORMATION);
}
WriteToLog("Connecting using UserName :" + username);
password = GetDecString(password);
String userInfo = username + ":" + password;
byte[] bt = new byte[userInfo.Length];
bt = System.Text.Encoding.UTF8.GetBytes(userInfo);
string encodedData = Convert.ToBase64String(bt);
String authInfo = "Basic " + encodedData;
_webRequest.Headers.Set("Authorization", authInfo);
}
else
{
_webRequest.Credentials = creds_;
WriteToLog(String.Format("{0}{1}", "Connecting using provided User credentials UserName :", creds_.UserName));
}
}
try
{
Stream _stream = _webRequest.GetRequestStream();
StreamWriter _writer = new StreamWriter(_stream);
_writer.Write(contents_);
_writer.Close();
HttpWebResponse _webResponse = (HttpWebResponse)_webRequest.GetResponse();
_stream = _webResponse.GetResponseStream();
StreamReader _sReader = new StreamReader(_stream);
String _response = _sReader.ReadToEnd();
_sReader.Close();
response = _response;
//Underlying connection closed response NOT An EXCEPTION
if (response.IndexOf("The underlying connection was closed:") == -1)
{
isSuccess = true;
}
else
{
isSuccess = false;
Thread.Sleep(1000);
}
}
//Got exception for connection closed
catch (Exception exp_)
{
if (exp_.Message.IndexOf("The underlying connection was closed:") != -1)
{
WriteToLog(string.Format("The underlying connection was closed. retrying {0}", noOfRetry.ToString()), EventLogEntryType.Error);
isSuccess = false;
}
}
noOfRetry++;
}
WriteToLog("HTTPPost Published message successfully");
}
catch (Exception exp_)
{
response = exp_.Message + Environment.NewLine + exp_.StackTrace;
WriteToLog(string.Format("In Catch Block {0}", response), EventLogEntryType.Error);
}
return response;
}
#endregion //End-HttpPost
#region WriteToLog
/// <summary>
/// Writes a message to Event Log
/// </summary>
/// <param name="message_">message to log</param>
protected void WriteToLog(string message_)
{
WriteToLog(message_, EventLogEntryType.Information);
}
#endregion //End-WriteToLog
#region WriteToLog
/// <summary>
/// Writes a message to Event Log
/// </summary>
/// <param name="message_">message to log</param>
/// <param name="level_">Level to Log error</param>
protected void WriteToLog(string message_, EventLogEntryType level_)
{
try
{
object logConfig = ConfigurationManager.AppSettings["enablelogging"];
bool enableLogging = logConfig == null ? false : Convert.ToBoolean(logConfig.ToString());
Console.WriteLine(Environment.NewLine + message_);
if (enableLogging)
{
string CurrentDate = DateTime.Now.ToShortDateString().Replace("/", "-");
File.AppendAllText(Server.MapPath("Logs/Error_Log_" + CurrentDate),
string.Format("{0}{1} {2} {3}"
, Environment.NewLine
, CurrentDate
, DateTime.Now.ToLongTimeString()
, message_));
}
}
catch //(Exception exp_)
{
//throw exp_;
}
}
#endregion //End-WriteToLog
cheers
varun sharma
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Hi!
There must be a smarter way to do this! This is about if I can bind a simple datastructure to a table.
Problem: I want to hold an instance of a (simple) datastructure - say a List<t> or a Collection or similar - I don't care - representing the contents of a view or table - say view. How to impl. that the most natural/generic way?
My solution:
// Fill DataTable.
DataTable dt = new DataTable();
string strConn = "Data Source=MyPC\\SQLExpress; Initial Catalog=MyDBInst; Integrated Security=True; User ID=; Password=;";
SqlConnection con = new SqlConnection(strConn);
SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM v_SomeViewOfMine", con);
da.Fill(dt);
// Populate List.
List<testclass> my_list = new List<testclass>();
foreach(DataRow dr in dt.Rows)
my_list.Add(new TestClass(
(string)dr.ItemArray[0],
(int)dr.ItemArray[1],
(int)dr.ItemArray[2],
(int)dr.ItemArray[3]));
con.Close();
Where constructor TestClass is:
public TestClass(string s, int a, int b, int c)
{ Name = s; Category = a; Conference = b; SubCategory = c; }
This approch works - "all is fine" and list is fine! Or is it? I feel that I miss some binding michanism-thingy like (pseudo):
List<testclass> my_list = new List<testclass>();
my_list.BindToDataTable(dt);
my_list.SetBindingColumn("Name", "Name", Type.string);
my_list.SetBindingColumn("Category", "Category", Type.int);
my_list.SetBindingColumn("Conference", "Conference", Type.int);
my_list.SetBindingColumn("Sub category", "SubCategory", Type.int);
Inspired from how one would setup a DataGrid in a xaml (< DataGridTextColumn Header="Name" Binding="{Binding Path=Name}" />).
So in other words: Do I have to iterate the DataTable myself (dealing with dr.ItemArray[] typed object) or can I bind it to a datastructure in some way?
Thank's in advance.
Michael Mogensen
modified on Saturday, October 30, 2010 8:56 PM
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You can do something like this instead of looping throught the dataset/SqlDataAdapter. First you can create a class that inherits DataContext. And then you can use methods of DataContext like to ExecuteQuery<> to convert your results in to objects. With this method you can directly use your queries you wrote earlier.
Consider the following example. First you need to define a class for interacting with your database
public class DBManagerDataContext : DataContext
{
private static string connectionString = "";
public static DBManagerDataContext CreateInstance()
{
return new DBManagerDataContext(connectionString);
}
protected DBManagerDataContext(string connectionString)
: base(connectionString, new AttributeMappingSource())
{
}
}
Then you can use this context to execute queries and convert them in to objects as shown below:
public class Report
{
public int ReportID;
public string ReportTitle;
public DateTime ReportDate;
private static string query = "select ReportID, ReportTitle, ReportDate from dbo.Reports";
public static List<Report> GetReportList()
{
DBManagerDataContext context = DBManagerDataContext.CreateInstance();
return context.ExecuteQuery<Report>(query).ToList();
}
}
You can use the method "GetReportList()" given above like this for example:
List<Report> reports = Report.GetReportList();
Please note that the query column names should match the definition in the object
This is just an example. You could do something like this, that would serve your purpose.
I guess this is what you are asking about...
Cheers,
Karthik
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I have a program developed in C#. The form's WindowState property is set to Maximized, but when i change the resolution than the window doesn't fits on the screen.
Any ideas, what to do so that whatever the resolution is windows adjusts accordingly
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Oh boy!
You will have to work on that. It's not a trivial problem, the best advice I can give is to suggest you start here: MSDN Automatic scaling in Windows Forms[^]
You may find that by using Panels and following the article you may be able to do it. But it would be better to re-design your app so you don't have a single, really busy, form...
Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.
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Or to use WPF - defining xaml's without any width/height information is just SO possible in WPF, making all windows fit to any screen or device.
Michael Mogensen
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Indeed - but since the post is in the C# forum, rather than the WPF, I have to assume that the OP doesn't know WPF...
Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.
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Nouman Bhatti wrote: I have a program developed in C#. The form's WindowState property is set to Maximized, but when i change the resolution than the window doesn't fits on the screen.
Any ideas, what to do so that whatever the resolution is windows adjusts accordingly
Go to the computer-store and look at the screens. They come with different height/width ratios, which means that a perfect circle on screen 1 might look like an ellipse on screen 2. The resolutions only scale well if the aspect-ratio remains equal. The VS drag&drop IDE is not a WYSIWYG-editor.
You could design different form-layouts to fit each, but that would amount to a lot of work.
The best idea is to have controls that can grow/shrink to fill up any extra space. A label would not adjust anything, a datagridview would fill up the form.
I are Troll 
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You solution may be easier than you think. If you are referring to form elements like text boxes, buttons, etc... then you should experiment with the Anchor properties of those controls.
I wasn't, now I am, then I won't be anymore.
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hey guys..i want to open a new form inside my MainForm when i click datagridview cells.. to do that i wrote these
dtyfrm = new DetayForm();
dtyfrm.MdiParent = this;
dtyfrm.Show();
but when i wrote this my Up-Down buttons dont work on the datagridview and when i delete thse block and try it they work
my KeyDown even is like that
so what is wrong now ?
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erdinc27 wrote: so what is wrong now ?
1. Your code is all commented out so there is nothing to do.
2. If you uncomment it you have try catch blocks that ignore any caught exceptions.
Just say 'NO' to evaluated arguments for diadic functions! Ash
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try
{
if ((e.KeyCode == Keys.Down))
MessageBox.Show(" ");
try
{
if ((e.KeyCode == Keys.Up))
MessageBox.Show(" ");
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
hey friend thanks for reply...i uncommented my codes but it doesnt give any error and the up-down buttons
and it doesnt move up-down
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What the ....??
First, this code cannot possibly throw an exception, so why even bother with the Try/Catch blocks?? Remove them...
if (e.KeyCode == Keys.Down)
MessageBox.Show(@"Down");
if (e.KeyCode == Keys.Up)
MessageBox.Show(@"Up");
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I was unable to respond earlier due to the move. However, as Dave says, why on earth are you using try catch around such simple code? No, don't answer that. I am still not sure why you think it necessary to capture the key events, since the gridview will do most of the work for you. Perhaps you could explain why you are doing it this way.
Just say 'NO' to evaluated arguments for diadic functions! Ash
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Trivi: You did'nt forget to += your KeyDown handler or some code removed it later?
As a last way out install a WndProc like
protected override WndProc( ref Message m )
{
// Do whatever here...
base.WndProc( ref m ); // May or may not need this call.
// ...or here.
}
I'm not updated on how messages are handled/filted for your grid type, byt this can be a last way out giving you a chance to milk msg's before they go in. The right word for this method should have been PreTranslateMessage(MSG*) like in the MFC days.
Michael Mogensen
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hey guys
thanks for your help..the things i learnt are very usefull really
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hi all
in neural networks algo of face detection a term is used a lot " training neural network". what does it mean? and a file is used with extension of NNCP which is loaded first. as for as i know that file contains different patterns of faces. i wana implement the neural network algorithm but i don't understand how to train neural network and how to make this NNCp file which contains different face paterens.
any suggestions links will be appreciated.
thanks
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Please stop multi posting the same question.
Just say 'NO' to evaluated arguments for diadic functions! Ash
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This is where you EARN your passing grade, and your degree, by doing your own research.
If this topic is something you picked, then you bit off more than you can chew before the end of the class. If it was assigned to you, then you've already been presented the materials during the class to get the job done.
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yes sir i started my own research now.
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If you spent as much time researching NNWs as you have posting here and here[^] you'd know at least how to train one.
Really, you need to look for a new project, you just won't cope with the one you have.
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i understood the Neural Networks now by my self.
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Except you don't: you don't even know what training a NNW is, this falls under the category "Basics".
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I suggest you go and talk to Prof. S.M. Aqil Burney, you can get his e-mail here University of Karachi CS Faculty[^] he seems to be the expert at your Uni. I also suggest you stop spamming the lounge.
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