I am new to .NET Core, so forgive me if my question is so basic.
I always use .NET Framework for my all project, but now I have to move to .NET Core 6.
In .NET Framework, I set my connection string in Web.config like this:
<add key="ConnStr" value="Data Source=DESKTOP-854AIA7;Initial Catalog=TestOTA;User ID=sa;Password=1"/>
<add key="ConnStrReport" value="Data Source=192.168.5.226;Initial Catalog=cachrsp01;User ID=sa;Password=123#123"/>
<add key="ConnStrLog" value="Data Source=192.168.5.226;Initial Catalog=loghrsp01;User ID=sa;Password=123#123"/>
then I have a class to manage them like this :
public class AccessToDb{
public static string ConnectionString
{
get
{
string tmp = System.Configuration.ConfigurationManager.AppSettings["ConnStr"];
if (string.IsNullOrEmpty(tmp))
{
do something
}
return tmp;
}
}
public static string ConnectionStringLog
{
get
{
string tmp = System.Configuration.ConfigurationManager.AppSettings["ConnStrLog"];
if (string.IsNullOrEmpty(tmp))
{
do something
}
return tmp;
}
}
}
In other classes when I need to call them, depends on which one I need I call them like:
objSqlCommand.Connection = new SqlConnection(AccessToDb.ConnectionString);
or
objSqlCommand.Connection = new SqlConnection(AccessToDb.ConnectionStringLog);
But I don't know where to set my Connection string and where to call them and how to use it in my methods. I search but all results I found, used entity framework.
UPDATE
I checked and finally find a way around it. I add this in appsettings.json :
{
"ConnectionStrings": {
"mymainDB": "server=192.168.5.226;database=cachrsp01;user id=sa;password='123#123'",
"myLogDB": "server=192.168.5.226;database=loghrsp01;user id=sa;password='123#123'"
}
}
then I created Class AccessToDb like this:
public class AccessToDb
{
public static string ConnectionString { get; set; }
public static string ConnectionStringLog { get; set; }
}
Finally in Program.cs I configure them:
AccessToDb.ConnectionString = builder.Configuration.GetConnectionString("mymainDB");
AccessToDb.ConnectionStringLog = builder.Configuration.GetConnectionString("myLogDB");
everything now works fine for me.
Related
Microprofile allows to define connectionPoolSize from RestClient like this:
io.smallrye.restclient.tests.proxy.HelloClient/property/resteasy.connectionPoolSize = 4
When I set this property in my project, quarkus ignores it. How can i define it?
Create class MyRestClientBuilderListener implements RestClientBuilderListener:
package org.myproject.config
public class MyRestClientBuilderListener implements RestClientBuilderListener {
static final Logger LOG = LoggerFactory.getLogger(MgiRestClientBuilderListener.class);
static final String CONNECTION_POOL_SIZE_PROP = "config.restclient.connectionPoolSize";
#Override
public void onNewBuilder(RestClientBuilder builder) {
Config cfg = ConfigProvider.getConfig();
Integer poolSizeConnection = cfg.getValue(CONNECTION_POOL_SIZE_PROP, Integer.class);
if(poolSizeConnection == null) {
poolSizeConnection = 50;//default
}
builder.property("resteasy.connectionPoolSize", poolSizeConnection);
}
}
Create file with name org.eclipse.microprofile.rest.client.spi.RestClientBuilderListener in META-INF\services with content:
org.myproject.config.MyRestClientBuilderListener
If your configured client is #RegisterRestClient(configKey="myClient"), to set the pool size use:
quarkus.rest-client.myClient.connection-pool-size: 5
(...and not myClient/mp-rest/connectionPoolSize)
Whats the best way to save variables like userid that is stored and reachable from different pages in WP7.
There's the querystring method, but can be kind of a pain to implement.
When navigating, pass the parameter like a HTTP querystring.
Then, on the otherside, check if the key exists, and extract the value. The downside of this is if you need to do more than 1, you need to type it in yourself, and it only supports strings.
So to pass an integer, you'd need to convert it. (And to pass a complex object, you need to take all the pieces you need to recompile it on the other side)
NavigationService.Navigate(new Uri("/PanoramaPage1.xaml?selected=item2", UriKind.Relative));
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
string selected = String.Empty;
//check to see if the selected parameter was passed.
if (NavigationContext.QueryString.ContainsKey("selected"))
{
//get the selected parameter off the query string from MainPage.
selected = NavigationContext.QueryString["selected"];
}
//did the querystring indicate we should go to item2 instead of item1?
if (selected == "item2")
{
//item2 is the second item, but 0 indexed.
myPanorama.DefaultItem = myPanorama.Items[1];
}
base.OnNavigatedTo(e);
}
Here's a sample app that uses a querystring.
http://dl.dropbox.com/u/129101/Panorama_querystring.zip
A easier (and better) idea is to define a variable globally, or use a static class. In App.xaml.cs, define
using System.Collections.Generic;
public static Dictionary<string,object> PageContext = new Dictionary<string,object>;
Then, on the first page, simply do
MyComplexObject obj;
int four = 4;
...
App.PageContext.Add("mycomplexobj",obj);
App.PageContext.Add("four",four);
Then, on the new page, simply do
MyComplexObj obj = App.PageContext["mycomplexobj"] as MyComplexObj;
int four = (int)App.PageContext["four"];
To be safe, you should probably check if the object exists:
if (App.PageContext.ContainsKey("four"))
int four = (int)App.PageContext["four"];
You may use an App level variable (defined in App.xaml.cs) and access it from anywhere within your app. If you want to persist, shove it into Isolated Storage and read it on App launch/activate. There are helpers available to JSon serialize/deserialize your reads/writes from the Isolated Storage.
Check out Jeff's post (here) on tips to use Isolated Storage.
Hope this helps!
Well "best" is always subjective, however, I think an application service is a good candidate for this sort of thing:-
public interface IPhoneApplicationService : IApplicationService
{
string Name {get; set;}
object Deactivating();
void Activating(object state);
}
public class AuthenticationService : IPhoneApplicationService
{
public static AuthenticationService Current {get; private set; }
public void StartService(ApplicationServiceContext context)
{
Current = this;
}
public void StopService()
{
Current = null;
}
public string Name {get; set;}
public object Deactivating()
{
// Return an serialisable object such as a Dictionary if necessary.
return UserID;
}
public void Activating(object state)
{
UserID = (int)state;
}
public int UserID { get; private set; }
public void Logon(string username, string password)
{
// Code here that eventually assigns to UserID.
}
}
You place an instance of this in your App.xaml:-
<Application.ApplicationLifetimeObjects>
<!--Required object that handles lifetime events for the application-->
<shell:PhoneApplicationService
Launching="Application_Launching" Closing="Application_Closing"
Activated="Application_Activated" Deactivated="Application_Deactivated"/>
<local:AuthenticationService Name="AuthServ" />
</Application.ApplicationLifetimeObjects>
Now you do need to tweak the App.xaml.cs:-
private void Application_Activated(object sender, ActivatedEventArgs e)
{
var state = PhoneApplicationService.Current.State;
foreach (var service in ApplicationLifetimeObjects.OfType<IPhoneApplicationService>())
{
if (state.ContainsKey(service.Name))
{
service.Activating(state[service.Name]);
}
}
}
private void Application_Deactivated(object sender, DeactivatedEventArgs e)
{
var state = PhoneApplicationService.Current.State;
foreach (var service in ApplicationLifetimeObjects.OfType<IPhoneApplicationService>())
{
if (state.ContainsKey(service.Name))
{
state[service.Name] = service.Deactivating();
}
else
{
state.Add(service.Name, service.Deactivating());
}
}
}
You can now access you UserID anywhere in your app with:-
AuthenticationService.Current.UserID
This general pattern can be used to maintain seperation of key application wide services (you don't load a whole bunch of incohesive properties into your App class). It also provides the hooks for maintaining state between activations which is essential.
Our winforms application has long allowed a "print" option which basically uses RDLC.
The customer has requested that we add a feature allowing users to send the "printed" output via email.
Now, we know that an EMF file is created (in the TEMP folder) as a sort of hidden byproduct of our current printing process.
Seems to us we can simply grab this EMF file and attach it to a new email and the job is done.
Is this the best option?
Can we rely on an EMF file be opened by any Windows machine?
How we identify the EMF file? ... just seems to be named %TEMP%\DiaryGrid_1.emf currently. OK so DiaryGrid is the name of our RDLC file but the _1 gets added somewhere along the way.
I did it before. I did it exporting programatically the report to a pdf to a specific location, then we email the pdf file and delete it. I will try to find the code for you (Not in home now)
EDITED:
Sorry for the later. Now i'm in home and I will give you some code blocks that I think will give you some help to acomplish your task. I will include some comments to the code so you can understand some things that are specific in my project. This code are tested and are working well in my clients, but i'm sure that it can be improved. Please, let me know if you can improve this code ;)
First of all, we will export the report to pdf.
private string ExportReportToPDF(string reportName)
{
Warning[] warnings;
string[] streamids;
string mimeType;
string encoding;
string filenameExtension;
byte[] bytes = ReportViewer1.LocalReport.Render(
"PDF", null, out mimeType, out encoding, out filenameExtension,
out streamids, out warnings);
string filename = Path.Combine(Path.GetTempPath(), reportName);
using (var fs = new FileStream(filename, FileMode.Create))
{
fs.Write(bytes, 0, bytes.Length);
fs.Close();
}
return filename;
}
Now, we need a class that control the Mail system. Every mail system has their own caracteristics, so maybe you will need modify this class. The behaviour of the class is simple. You only need to fill the properties, and call the Send method. In my case, windows don't let me delete the pdf file once I send it (Windows says the file is in use), so I program the file to be deleted in the next reboot. Take a look to the delete method. Please, note that the send method use a cutom class named MailConfig. This is a small class that has some config strings like Host, User Name, and Password. The mail will be send using this params.
public class Mail
{
public string Title { get; set; }
public string Text { get; set; }
public string From { get; set; }
public bool RequireAutentication { get; set; }
public bool DeleteFilesAfterSend { get; set; }
public List<string> To { get; set; }
public List<string> Cc { get; set; }
public List<string> Bcc { get; set; }
public List<string> AttachmentFiles { get; set; }
#region appi declarations
internal enum MoveFileFlags
{
MOVEFILE_REPLACE_EXISTING = 1,
MOVEFILE_COPY_ALLOWED = 2,
MOVEFILE_DELAY_UNTIL_REBOOT = 4,
MOVEFILE_WRITE_THROUGH = 8
}
[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
static extern bool MoveFileEx(string lpExistingFileName,
string lpNewFileName,
MoveFileFlags dwFlags);
#endregion
public Mail()
{
To = new List<string>();
Cc = new List<string>();
Bcc = new List<string>();
AttachmentFiles = new List<string>();
From = MailConfig.Username;
}
public void Send()
{
var client = new SmtpClient
{
Host = MailConfig.Host,
EnableSsl = false,
};
if (RequireAutentication)
{
var credentials = new NetworkCredential(MailConfig.Username,
MailConfig.Password);
client.Credentials = credentials;
}
var message = new MailMessage
{
Sender = new MailAddress(From, From),
From = new MailAddress(From, From)
};
AddDestinataryToList(To, message.To);
AddDestinataryToList(Cc, message.CC);
AddDestinataryToList(Bcc, message.Bcc);
message.Subject = Title;
message.Body = Text;
message.IsBodyHtml = false;
message.Priority = MailPriority.High;
var attachments = AttachmentFiles.Select(file => new Attachment(file));
foreach (var attachment in attachments)
message.Attachments.Add(attachment);
client.Send(message);
if (DeleteFilesAfterSend)
AttachmentFiles.ForEach(DeleteFile);
}
private void AddDestinataryToList(IEnumerable<string> from,
ICollection<MailAddress> mailAddressCollection)
{
foreach (var destinatary in from)
mailAddressCollection.Add(new MailAddress(destinatary, destinatary));
}
private void DeleteFile(string filepath)
{
// this should delete the file in the next reboot, not now.
MoveFileEx(filepath, null, MoveFileFlags.MOVEFILE_DELAY_UNTIL_REBOOT);
}
}
Now, you can create a form to ask for the destinataries, add some validation, etc, return to you an instance of the Mail class... or you can simply "hard code" the values and fill the class.
Here is the code that I use in a button to call this form, in my example it is named SendMailView.
private void BtnSendByMail_Click(object sender, EventArgs e)
{
SendMailView sendMailView = new SendMailView();
if (sendMailView.ShowDialog()== DialogResult.OK)
{
Mail mail = sendMailView.CurrentItem;
mail.AttachmentFiles.Add(ExportReportToPDF("Invoice.pdf"));
mail.DeleteFilesAfterSend = true;
mail.RequireAutentication = true;
mail.Send();
}
sendMailView.Dispose();
}
In this example senMailView.CurrentItem is the instance of the mail class. We simply need to call to the Send methis and the work is done.
This is the largest answer I ever wrote in SO... I hope it help you :D If you have any problem using it, call me. By the way, i'm not very proud of my english, so forgive me if the text has any mistake.
I have been googling to figure out how I can customize the Date format when I use jax-rs on apache CXF. I looked at the codes, and it seems that it only support primitives, enum and a special hack that assume the type associated with #FormParam has a constructor with a single string parameter. This force me to use String instead of Date if I want to use FormParam. it is kind of ugly. Is there a better way to do it?
#POST
#Path("/xxx")
public String addPackage(#FormParam("startDate") Date startDate)
{
...
}
Thanks
starting from CXF 2.3.2 registering ParameterHandler will do it. It is also always possible to override the date value (passed as part of the query, etc) using RequestHandler filters for default Date(String) to work
One simple apporach is take parameter as String and parse it in method body to convert it to java.util.Date
Another is create one class having constructor takes on parameter of type String. Perform same thing as I told in first approach.
here is the code for second approach.
#Path("date-test")
public class DateTest{
#GET
#Path("/print-date")
public void printDate(#FormParam("date") DateAdapter adapter){
System.out.println(adapter.getDate());
}
public static class DateAdapter{
private Date date;
public DateAdapter(String date){
try {
this.date = new SimpleDateFormat("dd/MM/yyyy").parse(date);
} catch (Exception e) {
}
}
public Date getDate(){
return this.date;
}
}
}
Hope this helps.
After reading the CXF codes (2.2.5), it is not possible, and it is hardcoded to use the Date(String) constructor, so whatever Date(String) support.
In Apache-cxf 3.0, you can use a ParamConverterProvider to convert a parameter to a Date.
The following code is copied from my answer to this question.
public class DateParameterConverterProvider implements ParamConverterProvider {
#Override
public <T> ParamConverter<T> getConverter(Class<T> type, Type type1, Annotation[] antns) {
if (Date.class.equals(type)) {
return (ParamConverter<T>) new DateParameterConverter();
}
return null;
}
}
public class DateParameterConverter implements ParamConverter<Date> {
public static final String format = "yyyy-MM-dd"; // set the format to whatever you need
#Override
public Date fromString(String string) {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
try {
return simpleDateFormat.parse(string);
} catch (ParseException ex) {
throw new WebApplicationException(ex);
}
}
#Override
public String toString(Date t) {
return new SimpleDateFormat(format).format(t);
}
}
I get the above error sometimes during the read. The exception originates from ASP.NET SqlDataReader whenever you try to read data before calling the Read() method. Since EF does all these internally, I am wondering what else can cause this error. could it be network (or) db connectivity?
thanks
Additional Bounty Info (GenericTypeTea):
I've got the same error after upgrading to EF Code First RC (4.1):
"Invalid attempt to read when no data
is present"
This is the code in question:
using (var context = GetContext())
{
var query = from item in context.Preferences
where item.UserName == userName
where item.PrefName == "TreeState"
select item;
// Error on this line
Preference entity = query.FirstOrDefault();
return entity == null ? null : entity.Value;
}
The table structure is as follows:
Preference
{
Username [varchar(50)]
PrefName [varchar(50)]
Value [varchar(max)] Nullable
}
The table is standalone and has no relationships. This is the DbModelBuilder code:
private void ConfigurePreference(DbModelBuilder builder)
{
builder.Entity<Preference>().HasKey(x => new { x.UserName, x.PrefName });
builder.Entity<Preference>().ToTable("RP_Preference");
}
Exactly the same code works perfectly in CTP5. I'm guessing this is an RC bug, but any ideas of how to fix it would be appreciated.
This error occurs when there is a large amount of data in the RC release. The difference between the RC and CTP5 is that you need to specify the [MaxLength] property that contains a large amount of data.
Are you re-using contexts? I would guess this is happening as a result of something you are doing within GetContext
If GetContext() provides a stale context, in which the DataReader is closed/corrupted, I could see the above happening.
I cannot reproduce your problem on EF4.1 RC1.
POCO:
public class Preference
{
public string UserName { get; set; }
public string PrefName { get; set; }
public string Value { get; set; }
}
Context:
public class PreferenceContext : DbContext
{
public DbSet<Preference> Preferences {get;set;}
public PreferenceContext()
: base("Data Source=localhost;Initial Catalog=_so_question_ef41_rc;Integrated Security=SSPI;") {
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
ConfigurePreference(modelBuilder);
base.OnModelCreating(modelBuilder);
}
private void ConfigurePreference(DbModelBuilder builder)
{
builder.Entity<Preference>().HasKey(x => new { x.UserName, x.PrefName });
builder.Entity<Preference>().ToTable("RP_Preference");
}
}
My little Console App:
class Program
{
static void Main(string[] args)
{
string userName = "Anon";
for (int i = 0; i < 10000; i++)
{
var p = GetPreference(userName);
}
}
private static string GetPreference(string userName)
{
using (var context = new PreferenceContext())
{
var query = from item in context.Preferences
where item.UserName == userName
where item.PrefName == "TreeState"
select item;
// Error on this line
Preference entity = query.FirstOrDefault();
return entity == null ? null : entity.Value;
}
}
}
I do 10,000 reads, and no error. You will need to post more complete code to continue.
Increase the CommandTimeout on the context.
I had the same issue with EF4 - In my case I was (trying to) return the list of entities within the using{} section. This is the same as you are doing in your question:
return entity == null ? null : entity.Value;
} // end using
I moved the return to after the } and it worked.
I think I had the problem because the code was in a function which had already queried the database in another using block, I suspect the table was locking but not reporting the error, ending the using block before the return released the database lock.
Steve