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• How to rewrite the following?(C#3.0)

  - by Newbie

  I am trying to write the following double sum_res = 0.0; double yhat = 0; double res = 0; int n = 0; for(int i=0;i<x.Count;i++) { yhat = inter + (slp*x[i]); res = yhat - y[i]; n++; } using lambda but somehow not able to get it work(compile time error) Enumerable.Range(0, x.Count).Select(i => { yhat = inter + (slp * x[i]); res = yhat - y[i]; sum_res += res * res; n++; }); Error: The type arguments for method 'System.Linq.Enumerable.Select(System.Collections.Generic.IEnumerable, System.Func)' cannot be inferred from the usage. Try specifying the type arguments explicitly. Help needed. Thanks

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• C# Console Application Output to .csv file

  - by Zinn

  I am trying to make a program that will show the numbers: 1, 10 +30 2, 40 (the scale goes up in this pattern by adding 20 to the last number added) 3, 90 +50 4, 160 5, 250 +70 So far I have this code: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO;// namespace Myloop { class Program { static void Main(string[] args) /// </summary> { StreamWriter myOutputStream = new StreamWriter("loopdata.csv"); int forloop; for (forloop = 1; forloop < 21; forloop++) Console.WriteLine(forloop); Console.ReadLine(); myOutputStream.Close(); } } } This is showing the first sequence of numbers 1 - 20, but could anyone give me any guidance how to do the other sequence next to it in the console application and how I can output these to a .csv file, as the information I have so far doesn't appear in the .csv file

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• C# - opening process and changing window position

  - by bartq

  I want to open from c# an application (standalone flashplayer) and set it position to (0,0) on the screen. How can I do this? So far I've managed to open flashplayer: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Diagnostics; namespace swflauncher { class Program { static void Main(string[] args) { Process flash = new Process(); flash.StartInfo.WindowStyle = ProcessWindowStyle.Normal; flash.StartInfo.FileName = "D:\\development\\flex4\\runtimes\\player\\10\\win\\FlashPlayer.exe"; flash.Start(); } } }

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• Best way to reverse a string in C# 2.0

  - by Guy

  I've just had to write a string reverse function in C# 2.0 (i.e. LINQ not available) and came up with this: public string Reverse(string text) { char[] cArray = text.ToCharArray(); string reverse = String.Empty; for (int i = cArray.Length - 1; i > -1; i--) { reverse += cArray[i]; } return reverse; } Personally I'm not crazy about the function and am convinced that there's a better way to do it. Is there?

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• How can I get running totals of integer values from a SortedDictionary?

  - by user578083

  SortedDictionary<int, string> typeDictionary = new SortedDictionary<int, string>(); SortedDictionary<int, int> lengthDictionary = new SortedDictionary<int, int>(); lengthDictionary has values in key value pair as follows: <1,20> <2,8> <3,10> <4,5> i want LINQ query which will return me new list like as follows <1,20> <2,20+8=28> // 20 from key 1 <3,28+10=38> // 28 from key 2 <4,38+5=43> // 38 from key 3 Result should like this: <1,20> <2,28> <3,38> <4,43>

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• Problem in populating a dictionary object using Enumerable.Range() (C#3.0)

  - by Newbie

  If I do for (int i = 0; i < appSettings.Count; i++) { string key = appSettings.Keys[i]; euFileDictionary.Add(key, appSettings[i]); } It is working fine. When I am trying the same thing using Enumerable.Range(0, appSettings.Count).Select(i => { string Key = appSettings.Keys[i]; string Value = appSettings[i]; euFileDictionary.Add(Key, Value); }).ToDictionary<string,string>(); I am getting a compile time error The type arguments for method 'System.Linq.Enumerable.Select(System.Collections.Generic.IEnumerable, System.Func)' cannot be inferred from the usage. Try specifying the type arguments explicitly. Any idea? Using C#3.0 Thanks

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• .NET project: unified wrapper for object databases.

  - by Steve

  I am considering doing a project which would provide unified API and tools (import/export, etc.) for object databases (e.g. Caché, Objectivity) for .NET. It would provide: schema generation from CLR classes, generation of C# classes from given OODBMs schema, API for deleting, creating and updating objects, Linq provider, API for calling object's methods on DB server, some of OODBMs provide some kind of SQL support, so API for this, providers for Caché and Objectivity in first phase. Does any project which implements any of above exist? Can this be achieved with NHibernate dialects? or are OODBMs so different than RDBMs that it worth doing separate framework for them?

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• gtk-sharp-2.0 hide/show external applications(processes)

  - by ziuciek

  Hi, maybe the topic isn't quite precise.. i want to write in c# (gtk#-2.0) an app which opens another app hidden and later shows that app. For now i know only how to open hidden app... in windows...: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Diagnostics; namespace do_kasacji { class Program { static void Main(string[] args) { ProcessStartInfo info = new ProcessStartInfo(); info.WindowStyle = ProcessWindowStyle.Minimized; info.FileName = "notepad"; using (Process pr = Process.Start(info)) { pr.WaitForExit(); } } } } Anyone knows how to change it so hat it would run in linux?

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• Get REST Call is not returning the string I put in url

  - by wizage

  I have very simple code: using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Net.Http; using System.Web.Http; namespace Calculator.Controllers { public class CalcController : ApiController { public string Get(string type) { return type; } } } And this is what it returns when I type in http://www.example.com/api/calc/test <string xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.microsoft.com/2003/10/Serialization/" i:nil="true"/> When I use http://www.example.com/api/calc/?test=test it returns this: <string xmlns="http://schemas.microsoft.com/2003/10/Serialization/">type</string> How to I make it so I can just do the top one instead of the bottom one?

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• Entity Framework Security

  - by NYSystemsAnalyst

  In my organization, we are just beginning to use the Entity Framework for some applications. In the past, we have pushed developers to utilize stored procedures for all database access. In addition to helping with SQL injection, we tried to grant logins access to stored procedures only to keep security relatively tight. Although inserting, updating, and deleting are easily done through stored procedures in the EF, it appears to be difficult to use stored procedures to query data with EF. However, using LINQ or Entity SQL and allowing EF to create the queries means giving a user read access to the entire database. How have others handled this dilemma?

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• Error when customize ValidationMessageFor

  - by user1542080

  i want to customize ValidationMessageFor which display error. when i run application, a get an error : No overload for method 'ValidationMessageFor' takes 1 arguments I'm understand my error, but i don't know how to fix it ? I need some suggest . Thanks you for reading! My code : using System.Linq.Expressions; using System.Web; using System.Web.Mvc; namespace OurCompanyUI.app_code { public static class MyHtml { public static MvcHtmlString ValidationMessageFor<TModel, TProperty>( this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, string validationMessage, IDictionary<string, Object> htmlAttributes ) { string modelName = ExpressionHelper.GetExpressionText(expression); TagBuilder p = new TagBuilder("p"); p.InnerHtml = htmlHelper.ValidationMessageFor(htmlHelper,expression).ToString(); // p.InnerHtml = htmlHelper.ValidationMessageFor().ToString(); return MvcHtmlString.Create(p.ToString(TagRenderMode.Normal)); } } }

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• Lambda expression will not compile

  - by John Soer

  I am very confused. I have this lamba expression: tvPatientPrecriptionsEntities.Sort((p1, p2) => p1.MedicationStartDate .Value .CompareTo(p2.MedicationStartDate.Value)); Visual Studio will not compile it and complains about syntax. I converted the lamba expression to an anonymous delegate as so: tvPatientPrecriptionsEntities.Sort( delegate(PatientPrecriptionsEntity p1, PatientPrecriptionsEntity p2) { return p1.MedicationStartDate .Value .CompareTo(p2.MedicationStartDate.Value); }); and it works fine. The project uses .NET 3.5 and I have a reference to System.Linq.

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• Count of Distinct Int32 Values in .NET

  - by Eric J.

  I am receiving a stream of unordered Int32 values and need to track the count of distinct values that I receive. My thought is to add the Int32 values into a HashSet<Int32>. Duplicate entries will simply not be added per the behavior of HashSet. Do I understand correctly that set membership is based on GetHashCode() and that the hash code of an Int32 is the number itself? Is there an approach that is either more CPU or more memory efficient? UPDATE The data stream is rather large. Simply using Linq to iterate the stream to get the distinct count is not what I'm after, since that would involve iterating the stream a second time.

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• How does Array.ForEach() compare to standard for loop in C#?

  - by DaveN59

  I pine for the days when, as a C programmer, I could type: memset( byte_array, '0xFF' ); and get a byte array filled with 'FF' characters. So, I have been looking for a replacement for this: for (int i=0; i < byteArray.Length; i++) { byteArray[i] = 0xFF; } Lately, I have been using some of the new C# features and have been using this approach instead: Array.ForEach<byte>(byteArray, b => b = 0xFF); Granted, the second approach seems cleaner and is easier on the eye, but how does the performance compare to using the first approach? Am I introducing needless overhead by using Linq and generics? Thanks, Dave

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• C# Improved algorithm

  - by generixs

  I have been asked at interview (C# 3.0) to provide a logic to remove a list of items from a list. I responded int[] items={1,2,3,4}; List<int> newList = new List<int>() { 1, 2, 3, 4, 5, 56, 788, 9 }; newList.RemoveAll((int i) => { return items.Contains(i); }); 1) The interviewer replied that the algorithm i had employed will gradually take time if the items grow and asked me to give even better and faster one.What would be the efficient algorithm ? 2) How can i achieve the same using LINQ? 3) He asked me to provide an example for Two-Way-Closure? (General I am aware of closure, what is Two-Way-Closure?, I replied there is no such term exists,but he did not satisfy).

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• git on HTTP with gitolite and nginx

  - by Arnaud

  I am trying to setup a server where my git repo would be accessible with HTTP(S). I am using gitolite and nginx (and gitlab for web interface but I doubt it makes any difference). I have searched the whole afternoon and I think I'm stuck. I have think I have understood that nginx needs fcgiwrap to work with gitolite, so I tried several configurations, but none of them work. My repositories are at /home/git/repositories. Here's the three nginx configurations I have tried. 1: location ~ /git(/.*) { gzip off; root /usr/lib/git-core; fastcgi_pass unix:/var/run/fcgiwrap.socket; include /etc/nginx/fcgiwrap.conf; fastcgi_param SCRIPT_FILENAME /usr/lib/git-core/git-http-backend; fastcgi_param DOCUMENT_ROOT /usr/lib/git-core/; fastcgi_param SCRIPT_NAME git-http-backend; fastcgi_param GIT_HTTP_EXPORT_ALL ""; fastcgi_param GIT_PROJECT_ROOT /home/git/repositories; fastcgi_param PATH_INFO $1; #fastcgi_param PATH_TRANSLATED $document_root$fastcgi_path_info; } Result: > git clone http://myservername/projectname.git test/ Cloning into test... fatal: http://myservername/projectname.git/info/refs not found: did you run git update-server-info on the server? and > git clone http://myservername/git/projectname.git test/ Cloning into test... error: The requested URL returned error: 502 while accessing http://myservername/git/projectname.git/info/refs fatal: HTTP request failed 2: location ~ /git(/.*) { fastcgi_pass localhost:9001; include /etc/nginx/fcgiwrap.conf; fastcgi_param SCRIPT_FILENAME /usr/lib/git-core/git-http-backend; fastcgi_param GIT_HTTP_EXPORT_ALL ""; fastcgi_param GIT_PROJECT_ROOT /home/git/repositories; fastcgi_param PATH_INFO $1; } Result: > git clone http://myservername/projectname.git test/ Cloning into test... fatal: http://myservername/projectname.git/info/refs not found: did you run git update-server-info on the server? and > git clone http://myservername/git/projectname.git test/ Cloning into test... error: The requested URL returned error: 502 while accessing http://myservername/git/projectname.git/info/refs fatal: HTTP request failed 3: location ~ ^.*\.git/objects/([0-9a-f]+/[0-9a-f]+|pack/pack-[0-9a-f]+.(pack|idx))$ { root /home/git/repositories/; } location ~ ^.*\.git/(HEAD|info/refs|objects/info/.*|git-(upload|receive)-pack)$ { root /home/git/repositories; fastcgi_pass unix:/var/run/fcgiwrap.socket; fastcgi_param SCRIPT_FILENAME /usr/lib/git-core/git-http-backend; fastcgi_param PATH_INFO $uri; fastcgi_param GIT_PROJECT_ROOT /home/git/repositories; include /etc/nginx/fcgiwrap.conf; } Result: > git clone http://myservername/projectname.git test/ Cloning into test... error: The requested URL returned error: 502 while accessing http://myservername/projectname.git/info/refs fatal: HTTP request failed and > git clone http://myservername/git/projectname.git test/ Cloning into test... error: The requested URL returned error: 502 while accessing http://myservername/git/projectname.git/info/refs fatal: HTTP request failed Also note that with any of those configurations, when I try to clone with a project name that actually doesn't exist, I get a 502 error. Does anyone already succeeded in doing this? What am I doing wrong? Thanks. UPDATE: nginx error log file said: 2012/04/05 17:34:50 [crit] 21335#0: *50 connect() to unix:/var/run/fcgiwrap.socket failed (13: Permission denied) while connecting to upstream, client: 192.168.12.201, server: myservername, request: "GET /git/oct_editor.git/info/refs HTTP/1.1", upstream: "fastcgi://unix:/var/run/fcgiwrap.socket:", host: "myservername" So I changed permissions for /var/run/fcgiwrap.socket, and now I have : > git clone http://myservername/git/projectname.git test/ Cloning into test... error: The requested URL returned error: 403 while accessing http://myservername/git/projectname.git/info/refs fatal: HTTP request failed Here is the error.log file I have now: 2012/04/05 17:36:52 [error] 21335#0: *78 FastCGI sent in stderr: "Cannot chdir to script directory (/usr/lib/git-core/git/projectname.git/info)" while reading response header from upstream, client: 192.168.12.201, server: myservername, request: "GET /git/projectname.git/info/refs HTTP/1.1", upstream: "fastcgi://unix:/var/run/fcgiwrap.socket:", host: "myservername" I keep on investigating.

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• AppCmd returns error: Object 'SET' is not supported

  - by RHPT

  I am trying to set SSL Host Headers and Secure Site Bindings in IIS7. I followed the directions on this website http://www.digicert.com/ssl-support/ssl-host-headers-iis-7.htm (among others), but when I run the appcmd command mentioned, I get the error "Object 'SET' is not supported. Run 'appcmd.exe /?' to display supported objects". I have also tryed "appcmd site set" but it still returns the same error. What am I doing wrong? The server I am working on is Windows 2008 R2 x64, if that matters. Thank you.

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• SQL 2008 Database tuning advisor won’t start

  - by Andrew Hancox

  For some reason I can't get DTA to connect to my development machine. It connects to a remote DB just fine but when I point it to my dev machine I get an error saying: Failed to initialize MSDB database for tuning (exit code: -1073741819). I'm pretty sure it's not a permissions issue since I've used profiler to capture what it's doing and all of the commands it's run so far look fine and are being run under my account which is associated with the sysadmin role, when I run them in sql management studio they go through fine. I'm pretty convinced that the problem is related to creating the objects in MSDB that are used by DTA but I tried creating these manually (I found scripts on the web) and it just seems to push the problem along the line slightly. I'm going out of my mind - have even tried reinstalling SQL but that's not fixed it. I'm using SQL 2008 with SP1 (10.0.2531) on windows server 2008 (patched up to date). SAVE ME!!!!!

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• Exposing BL as WCF service

  - by Oren Schwartz

  I'm working on a middle-tier project which encapsulates the business logic (uses a DAL layer, and serves a web application server [ASP.net]) of a product deployed in a LAN. The BL serves as a bunch of services and data objects that are invoked upon user action. At present times, the DAL acts as a separate application whereas the BL uses it, but is consumed by the web application as a DLL. Both the DAL and the web application are deployed on different servers inside organization, and since the BL DLL is consumed by the web application, it resides in the same server. The worst thing about exposing the BL as a DLL is that we lost track with what we expose. Deployment is not such a big issue since mostly, product versions are deployed together. Would you recommend migrating from DLL to WCF service? if so, why ? Do you know anyone who had a similar experience ?

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• Exposing BL as WCF service

  - by Oren Schwartz

  I'm working on a middle-tier project which encapsulates the business logic (uses a DAL layer, and serves a web application server [ASP.net]) of a product deployed in a LAN. The BL serves as a bunch of services and data objects that are invoked upon user action. At present times, the DAL acts as a separate application whereas the BL uses it, but is consumed by the web application as a DLL. Both the DAL and the web application are deployed on different servers inside organization, and since the BL DLL is consumed by the web application, it resides in the same server. The worst thing about exposing the BL as a DLL is that we lost track with what we expose. Deployment is not such a big issue since mostly, product versions are deployed together. Would you recommend migrating from DLL to WCF service? if so, why ? Do you know anyone who had a similar experience ? Thank you !

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• Can't Delete Old Windows Directory

  - by David Mullin

  I got a new SSD drive for my computer, and have installed Windows on this drive. This left an old Windows directory on my old normal drive. I am now attempting to delete this old Windows directory, but am getting blocked by security. If I crawl down into each subdirectory, I can manually change the ownership and access rights for each file, but if I attempt to do it from the root directory, I get a "Failed to enumerate objects in the container. Access is denied" error. I have tried logging in as local Administrator, but this had the same effect. I figure that I am missing something stupid, but I just can't determine what it is.

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• Active Directory, Linux, and User Private Groups

  - by larsks

  We're in the process of moving from NIS on our Linux systems to binding everything to Active Directory. The NIS environment follows the common standard used by many Linux distributions that a user's primary group is a group of the same name as the user (and of which the user is typically the only member). I have been informed that in the Active Directory environment, you may not have a group name with the same name as a user (specifically, that no two AD security objects may have the same name). This would seem to complicate the process of moving our group definitions into AD. It looks like we could maintain the NIS group information in AD using only POSIX attributes (e.g., not an actual AD security object), but that seems like a suboptimal fix (because we do really want to have the same view of group membership in both the Unix and AD worlds). Have you moved a large legacy NIS environment into Active Directory? How did you handle this situation?

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• Can I link proxy users from a single LDS instance to multiple domains?

  - by ixe013

  I have an Active Directory Lightweight Directory Services set up. I have objects that represent users in the Active Directory (Domain_A). I have set their objectSID attribute, and users can authenticate to LDS with their Active Directory password. I love it. I want to bring in new users, from a different Active Directory (Domain_B) that has not trust relationship whatsoever with the Active Directory from Domain_A. Is there a way to tell LDS in which domain to look for users or does it always look in the domain it is in, maybe by using another protocol than Kerberos ? +I figured out user provisionning, no need to mention it. Thanks !

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• Fail rate of EBS snapshots and AMIs?

  - by user784637

  According to Amazon the fail rate of EBS volumes is: As an example, volumes that operate with 20 GB or less of modified data since their most recent Amazon EBS snapshot can expect an annual failure rate (AFR) of between 0.1% – 0.5%, where failure refers to a complete loss of the volume http://aws.amazon.com/ebs/ However, I was curious to know the fail rate of EBS snapshots and private AMIs that a system admin would take. Since the EBS snapshots and AMIs are stored in Amazon s3, is it safe to assume that the likelihood you cannot rollback to a previous snapshot or AMI the same likelihood that a file gets lost in s3? Amazon S3’s standard storage is: ... Designed to provide 99.999999999% durability and 99.99% availability of objects over a given year. http://aws.amazon.com/s3/

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• SCCM 2007 managing hosts in non trusted forest

  - by BoxerBucks

  I have an implementation of SCCM 2007 in forest "A" that manages hosts in that Windows 2008 forest. There is another forest/domain, "B", which I have no trust with that I need to manage hosts in as well. I don't need to push out clients from the SCCM console, I am going to install them manually. I just need the hosts in domain "B" to connect back to the forest/domain "A" for management purposes. To date, I have not added any AD objects to domain "B" for hosts to query for site, SLP or management point info. I am installing the hosts with the command line: ccmsetup.exe /mp:SCCM_Server /site:mysite SCCM_Server = FQDN of my sccm server (which is resolvable by the client) There are no ACL's between the two servers. From the logs, I can see the install complete and the client tries to query the local AD for the site info for "mysite" but it can't find it and it stops and never connects. Can anyone give me some direction as to how this should be setup?

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