Global Import / Using Aliasing In .NET?
Mar 19, 2010
Using import aliasing in one file/class, we can reference class library namespaces by assigning our own custom alias like this:
' VB
Imports Db = Company.Lib.Data.Objects
// C#
using Db = Company.Lib.Data.Objects;
And then we are able to reference the classes inside of Company.Lib.Data.Objects by using the Db alias that we assigned.
Is it possible to do this at the global level so that the alias is applied to the entire solution instead of just one file/class?
Currently, we are working with web applications, so I was hoping we could add something to web.config, but I am also interested in whether or not this is possible with windows forms, console apps, and/or class libraries.
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May 31, 2010
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Apr 23, 2010
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[code]...
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Feb 8, 2011
I know there is a couple answered questions on here regarding "request scoped" globals, but I want to nit-pick on something specifically and maybe squeeze some extra enlightenment out of one or two of you.I have an ASP.NET C# Website and a static Dictionary of objects (loaded from DB once on Application start). Each page request will need to do a lookup in the Dictionary (based on a key derived from the request url/etc) and get the appropriate object.The issue is I'm trying to maximize efficiency by reducing the lookups to the Dictionary per Request. Doing just a single lookup within a Page itself is easy enough and I can pass the object to sub controls, etc too.. but global.asax is separate from the Page and it also needs to use the object (in Application_BeginRequest and Session_Start).
So is doing a Dictionary lookup once in Application_BeginRequest, once (when necessary) in Session_Start and once in the Page negligible speed wise, even if there are many requests coming in every second?I would like it if I could just have a Request scoped global variable that I can easily call upon.. the only one I see available though is HttpContext.Current.Items and that is a Dictionary itself.Am I beingridiculously nit-picky with my concern over efficiency? or will these milliseconds (nanoseconds?) get me in the long run when more and more requests are being made?
PS. I currently only have around 100 objects in the Dictionary although this may increase in the future.
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Feb 17, 2011
Possible Duplicate: How to read a csv file into a .net datatable. I have a problem in my project, where I am trying to read data in a csv file, I want to convert this data to a datatable. How can I do this?
System.Data.Odbc.OdbcConnection conn;
DataTable insDataTable = new DataTable();
System.Data.Odbc.OdbcDataAdapter da;
string folder = files.FullName;
string file = System.IO.Path.GetFileName(fUpload.PostedFile.FileName);
conn = new System.Data.Odbc.OdbcConnection(@"Driver={Microsoft Text Driver (*.txt; *.csv)};Dbq=" + folder + ";Extensions=asc,csv,tab,txt;Persist Security Info=False");
da = new System.Data.Odbc.OdbcDataAdapter("select * from [" + file + "]", conn);
da.Fill(insDataTable);
It gives an error like :
ERROR [42S02] [Microsoft][ODBC Text Driver] The Microsoft Jet database engine could not find the object 'test.csv'. Make sure the object exists and that you spell its name and the path name correctly. I am checking there is a file 'test.csv' and the file path is correct
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Aug 3, 2010
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Oct 21, 2010
So I'm in the process of writing an ASP.NET application that requires to import users from a PHP application. The passwords were hashed using MD5 into the database, so the user table records looks more or less like this:
user Password
user1 827ccb0eea8a706c4c34a16891f84e7b
user2 e10adc3949ba59abbe56e057f20f883e
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[Code]....
Problem is, that is returning strings like 50-F8-4D-AF-3A-6D-FD-6A-9F-20-C9-F8-EF-42-89-42, which of course is not going to match with the information in the database. What should I do so I don't have to reset 500+ user passwords?
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Apr 10, 2010
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Jul 14, 2010
this started out as a pretty simple task to import a customers data into our database. The script below loads all the data into memory and then allow manipulation after.
string ConString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="" + FileLoc + ""; Extended Properties="text;HDR=Yes;FMT=Delimited(,)"";
using (OleDbConnection conn = new OleDbConnection(ConString))
{
using (OleDbCommand cmd = new OleDbCommand("SELECT * FROM DataInput.csv", conn))
{
conn.Open();
using (OleDbDataReader dr = cmd.ExecuteReader(CommandBehavior.SequentialAccess))
{
int RowNumber = 0;
while (dr.Read())
{
if(RowNumber==0)
{
for (int i = 0; i < dr.FieldCount; i++)
{
TitleData.Add(new CSVTitleData() {ColumnID = i,ColumnName = dr.GetValue(i).ToString()});
}
}
else
{
var DataToInsert = new List<CSVData>();
for (int i = 0; i < dr.FieldCount; i++)
{
if (i == 8)
{
var A = dr.GetValue(i);
Console.WriteLine(A.GetType().ToString() + " - " + i);
}
DataToInsert.Add(new CSVData(){ColumnID = i,Value = dr.GetValue(i).ToString()});
}
Content.Add(DataToInsert);
}
RowNumber++;
}
}
}
}
This works fine until there is data like
4950
4951
4952
4998
2024
4176
7025-1
RVAC010
RVAC011
4945
4946
4947
4948
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[code]...
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Feb 23, 2010
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Sep 8, 2010
I'm currently struggling with this problem:
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I'm writing a reporting tool that, as a starting point, needs to create a DB table from a csv file. This csv file will have been created from exporting data from our old system (with the new system being the reporting tool) and can have up to 300 columns of data. I've been trying as follows:
[Code]....
but am finding that only the first 255 columns get put in. I am assumg that the Jet driver is the one that is limiting the columns, or is there a registry setting somewhere that'll solve it quickly?
Is there another approach that'll work? I've though of the following, but as it'll take a while to recode and test each time I thought I'd ask the experts first!!
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May 29, 2010
instead of using gridview to insert student marks (I have hundreds of students) thought I used the Excel:
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[Code]....
But in this code I do not know how to:
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* Calculate the average of this module : sum (coeff * mark) / sum (coeff)
2) Allowing responsable module send me the file containing the data (but then I do not know how)
3) Using data, by sending them to the database to calculate averages.
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