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You should NOT do this with string manipulations; it would go completely wrong if the user types strange things, such as the intended number prefixed with a lot of zeroes.
The proper way to do this consists of two steps:
1.
parse the user input, i.e. turn his characters into an actual number. The simplest way would be:
int val;
bool OK=int.TryParse(myTextBox.Text, out val);
Whatever the user does wrong (e.g. typing letters, or providing no input at all) will result in OK being false; if the input is acceptable, OK will be true and val will contain its value.
2.
format the number in the way you want it. A simple way to get two spaces in a number assumed to require 8 digits is:
string s=string.Format("{0:## ### ###.##}", val);
Assuming val=12345678 the result will be 12 345 678
Luc Pattyn [My Articles] Nil Volentibus Arduum
The quality and detail of your question reflects on the effectiveness of the help you are likely to get. Please use <PRE> tags for code snippets, they improve readability. CP Vanity has been updated to V2.3
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I always like your answers.
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Could be also
1. If the currect culture uses ' ' as a group separator:
string.Format("{0:n0}", val)
2. If it doesn't:
var provider = (CultureInfo) CultureInfo.CurrentCulture.Clone();
provider.NumberFormat.NumberGroupSeparator = " ";
string.Format(provider, "{0:n0}", val);
Greetings - Jacek
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yes, there are alternatives for each of both steps. Having the two steps was the essence in my message.
Luc Pattyn [My Articles] Nil Volentibus Arduum
The quality and detail of your question reflects on the effectiveness of the help you are likely to get. Please use <PRE> tags for code snippets, they improve readability. CP Vanity has been updated to V2.4
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To be precise: My (1) and (2) were alternatives to your (2). They both assumes that your (1) was already done.
Greetings - Jacek
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Of course; and that is how I understood it.
Luc Pattyn [My Articles] Nil Volentibus Arduum
The quality and detail of your question reflects on the effectiveness of the help you are likely to get. Please use <PRE> tags for code snippets, they improve readability. CP Vanity has been updated to V2.4
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Hi guys, i have a method like this: public List<t> listObj<t>() {}
and i want to instantiate a object with this type T, i tried this: T obj = new T(); doesnt work, so i tried T obj = default(T); and doesnt work too... how can i instantiete this obj??? Thanks.
The code:
public class MysqlDireto
{
private static MysqlDireto _instancia;
private static string connectionstring = "Server=;Database=;Uid=;Pwd=;";
public static MysqlDireto Instancia
{
get { return _instancia ?? (_instancia = new MysqlDireto()); }
}
public List<T> ObterLista<T>()
{
MySqlConnection conn = new MySqlConnection(connectionstring);
string comando = "SELECT * FROM " + typeof(T).Name;
MySqlCommand cmd = new MySqlCommand(comando, conn);
conn.Open();
MySqlDataReader leitor = cmd.ExecuteReader();
List<T> lista = new List<T>();
if (leitor.HasRows)
{
while (leitor.Read())
{
T obj = Foo<T>();
obj.GetType().GetProperty("Id").SetValue(obj, leitor["Id"], null);
lista.Add(obj);
}
}
conn.Close();
return lista;
}
public T Foo<T>() where T : class, new()
{
return new T();
}
}
modified on Wednesday, June 8, 2011 2:11 PM
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you have to add new() in the where clause of the generic definition.
public T Foo<T>() where T : new(){
return new T();
}
Or such
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i got this msg: Error 800 'T' must be a non-abstract type with a public parameterless constructor in order to use it as parameter 'T' in the generic type or method
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I think the error message is clear about what you need to fix: pass your generic class a type that can be instantiated with new T() (i.e. a non-abstract, with a parameterless constructor).
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but the T class is a non-abstract and has no constructor parameter
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The class that you pass as the generic parameter for T must be like the 'Test' class in the example that Ennis posted below.
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public class Test {
public Test() {
}
}
public class Bar {
public static void Test<T>() where T : Test, new() {
T t = new T();
}
}
...
Bar.Test <Test>();
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Thanks a lot, it was missing "Test,"
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Hi,
I have a couple of headings that need set to bold and underlined but having trouble getting this to work in itextsharp. Writing out to a pdf. I can get the heading set to bold or i can get it underlined but not both at the same time.
Font normalBold = FontFactory.GetFont("times", 10, Font.BOLD);
Font normalBoldUnderlined = FontFactory.GetFont("times",10,Font.UNDERLINE);
I have also tried to create a paragraph but include the heading and set it to underlined but for some reason it sets the whole document underlined..
Paragraph paragraphThree = new Paragraph("Exchanger Represents:\n", normalBold);
paragraphThree.SetAlignment("Justify");
paragraphThree.IndentationLeft = 20;
paragraphThree.Font.SetStyle(iTextSharp.text.Font.UNDERLINE);
Anyone any ideas apart from drawing a line as to how to do this?
Thanks in advance
Paul
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Are those flags combinable (i.e. Font.BOLD | Font.UNDERLINE)?
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Excellent BobJanova. That works perfectly.
Thanks for your answer
Paul
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Welcome. This is a common pattern in .Net for combinations of options, for example control styles, anchoring, keyboard modifiers and as you found out font options.
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I'll keep that in mind. Thought i was going nuts as I couldn't find an example anywhere on the net and I knew it would be something simple
Thanks again
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A lot of hints to be found here[^].
Luc Pattyn [My Articles] Nil Volentibus Arduum
The quality and detail of your question reflects on the effectiveness of the help you are likely to get. Please use <PRE> tags for code snippets, they improve readability. CP Vanity has been updated to V2.3 modified on Friday, June 10, 2011 8:40 PM
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Below there is code for update button the error for this code is mentioned in subject line.
private void update_Click(object sender, EventArgs e)
{
try
{
con.Open();
OleDbDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
if (securityname.SelectedItem.ToString() == dr[0].ToString())
{
break;
}
}
cmd.Parameters.AddWithValue("@User_Id", OleDbType.VarChar);
cmd.Parameters.AddWithValue("@Security_Name", OleDbType.VarChar);
cmd.Parameters.AddWithValue("@qty_bought", OleDbType.Integer);
cmd.Parameters.AddWithValue("@qty_sold", OleDbType.Integer);
cmd.Parameters.AddWithValue("@Rate_Security", OleDbType.Double);
cmd.Parameters.AddWithValue("@Total_security", OleDbType.Double);
cmd.Parameters.AddWithValue("@Brokerage", OleDbType.Double);
cmd.Parameters.AddWithValue("@Net_Rate", OleDbType.Double);
cmd.Parameters.AddWithValue("@Service_Tax", OleDbType.Double);
cmd.Parameters.AddWithValue("@Stt_Amt", OleDbType.Double);
cmd.Parameters.AddWithValue("@Total_Amt", OleDbType.Double);
cmd.Parameters.AddWithValue("@Net_Delivery", OleDbType.Double);
cmd.Parameters.AddWithValue("@Tran_Charges", OleDbType.Double);
cmd.Parameters.AddWithValue("@Sec_Tran_Charges", OleDbType.Double);
cmd.Parameters.AddWithValue("@Stamp_Duty", OleDbType.Double);
cmd.Parameters.AddWithValue("@Total_due", OleDbType.Double);
cmd.Parameters.AddWithValue("@NSE", OleDbType.Boolean);
cmd.CommandText = "Update Security SET qty_bought=@qty_bought,qty_sold=@qty_sold,Rate_Security=@Rate_Security,Total_Security=@Total_Security,Brokerage=@Brokerage,Net_Rate=@Net_Rate,Service_Tax=@Service_Tax,Stt_Amt=@Stt_Amt,Total_Amt=@Total_Amt,Net_Delivery=@Net_Delivery,Tran_Charges=@Tran_Charges,Sec_Tran_Charges=@Sec_Tran_Charges,Stamp_Duty=@Stamp_Duty,Total_due=@Total_due,NSE=@NSE Where Security_Name=@Security_Name AND User_Id=@User_Id";
securityTableAdapter.Update(strUserId, Convert.ToInt32(Qty_biught.Text), Convert.ToInt32(qty_sold.Text), Convert.ToDouble(gross_rate.Text), Convert.ToDouble(tot.Text), Convert.ToDouble(broker.Text), Convert.ToDouble(Net_rate.Text), Convert.ToDouble(Serv_Tax.Text), Convert.ToDouble(stt_amt.Text), dTot, Convert.ToDouble (Net_Del.Text), Convert.ToDouble(Tran_chr.Text), Convert.ToDouble(Sec_tran_tax.Text), Convert.ToDouble(stamp_duty.Text), Convert.ToDouble(bal_amt.Text), NSE.Checked, dr[0].ToString(), dr[1].ToString(), Convert.ToInt32(dr[2].ToString()), Convert.ToInt32(dr[3].ToString()), Convert.ToDouble(dr[4].ToString()), Convert.ToDouble(dr[5].ToString()), Convert.ToDouble(dr[6].ToString()), Convert.ToDouble(dr[7].ToString()), Convert.ToDouble(dr[8].ToString()), Convert.ToDouble(dr[9].ToString()), Convert.ToDouble(dr[10].ToString()), Convert.ToDouble(dr[11].ToString()), Convert.ToDouble(dr[12].ToString()), Convert.ToDouble(dr[13].ToString()), Convert.ToDouble(dr[14].ToString()), Convert.ToDouble(dr[15].ToString()), Convert.ToBoolean(dr[16].ToString()));
dr.Close();
cmd.ExecuteNonQuery();
Security_name.Text = securityname.Text;
securityname.Visible = false;
Security_name.Visible = true;
con.Close(); }
catch (Exception ex)
{
con.Close();
MessageBox.Show(ex.ToString());
}
}
Bold code is having a exception and I made all initialization regarding Connection and Command in Load_Form().
modified on Thursday, June 9, 2011 12:31 AM
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Hi,
I'm not familiar with that exception.
I'm having difficulties reading your code, as you did not use PRE tags. You could still edit and add them.
I did see a few strange things:
1.
there are two very similar lines cmd.ExecuteReader(); and cmd.ExecuteNonQuery();
2.
the declarations and initialisations of con and cmd are missing.
3.
The normal way to do database accesses would be:
- to have an open,use,close pattern for the connection, relying on connection pooling. A using statement is extremely useful here, as it would close the connection for you.
- to have a create, use, dispose pattern for the command, again a using statement works well.
4.
The DataReader also needs being disposed of; again using is useful.
So it would end up looking like this:
using (OleDbConnection con=new OleDbConnection(...)) {
using (OleDbCommand cmd=new OleDbCommand(...)) {
using (OleDbDataReader dr = cmd.ExecuteReader()) {
while (dr.Read()) {
...
}
}
}
using (OleDbCommand cmd=new OleDbCommand(...)) {
cmd.Parameters.Add...;
cmd.ExecuteNonQuery();
{
}
Now con, cmd, dr automatically get closed/disposed even when exceptions were thrown.
PS: I have no idea what "AutoSizeMode" is doing in your subject line.
Luc Pattyn [My Articles] Nil Volentibus Arduum
The quality and detail of your question reflects on the effectiveness of the help you are likely to get. Please use <PRE> tags for code snippets, they improve readability. CP Vanity has been updated to V2.3
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Hello.
I'm implementing WebDAV COPY method.
public void Copy(string userName, string password, string source, string destination)
{
CredentialCache MyCredentialCache = new CredentialCache();
MyCredentialCache.Add(new System.Uri(source), "Basic", new NetworkCredential(userName, password));
try
{
HttpWebRequest Request = (System.Net.HttpWebRequest)HttpWebRequest.Create(source);
Request.Credentials = MyCredentialCache;
Request.Method = "COPY";
Request.Headers.Add("Destination", destination);
Request.Headers.Add("Overwrite", "F");
HttpWebResponse Response = (System.Net.HttpWebResponse)Request.GetResponse();
Response.Close();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
The method works fine with non-unicode file names.
But, if I want to copy a file with korean letters in its name (http://myDAVserver.myCompany.com/dav/한글.txt) I get the following error:
Message: Specified value has invalid Control characters.
Parameter name: value
I tracked the error, and the exception is being throwed exactly in
Request.Headers.Add("Destination", destination);
Does anybody have an idea how to handle this problem?
Thank you.
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