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MapPath is only used with websites: it "communicates" with IIS and converts "~" into the root folder fro your site.
For non-website based applications the HttpContext and the Server don't exist, so you get a null reference.
If the file changes at all, then consider storing it elsewhere: Where should I store my data?[^] will help.
If it doesn't change at all, then embed it as a resource to your application, and use Properties.Resources to fetch the file data.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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I want to ping a list of IPs but it's not working.
I already use this function in console app and it was working.
<pre>string[] addresses = { "192.168.1.2", "192.168.1.3", "192.168.1.4" };
void show()
{
List<Task<PingReply>> pingTasks = new List<Task<PingReply>>();
foreach (var address in addresses)
{
pingTasks.Add(PingAsync(address));
}
Task.WaitAll(pingTasks.ToArray());
int i = 0;
listView1.Clear();
listView1.Columns.Add("Device IP", 100);
listView1.Columns.Add("ping", 60);
foreach (var pingTask in pingTasks)
{
string[] A = { addresses[i], pingTask.Result.RoundtripTime.ToString() };
ListViewItem item = new ListViewItem(A);
listView1.Items.Add(item);
}
}
Task<PingReply> PingAsync(string address)
{
var tcs = new TaskCompletionSource<PingReply>();
Ping ping = new Ping();
ping.PingCompleted += (obj, sender) =>
{
tcs.SetResult(sender.Reply);
};
ping.SendAsync(address, new object());
return tcs.Task;
}
please helpppppppppp!
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Don't post in multiple places - it duplicates work and that annoys people.
You already have this in QA, so leave it there!
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Hi folks, looking for some help here, I need to make a Rest request.
I'm using Microsoft studio 2015.
I need to include header i.e Content-type: application/json and pass in 2 parameters.
Any pointer or help much appreciated.
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I'm working on dataGrid Save content based on SQL Server data, C # smart devices and I have all the code I do not make mistake but not save data
string partDir = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase);
string partBD = System.IO.Path.Combine(partDir, "embarque.sdf");
string connectionstring = string.Format(@"DataSource={0}; Password ='root'", partBD);
try
{
using (SqlCeConnection con = new SqlCeConnection(connectionstring))
{
string ConsultaSQL = "INSERT INTO ENVIO VALUES(@RAID, @NPARTE, @CANTIDAD, @VENTANA, @LIDER, @FECHA)";
foreach (DataRow row in dt.Rows)
{
SqlCeCommand cmd = new SqlCeCommand(ConsultaSQL, con);
cmd.Parameters.Clear();
cmd.Parameters.AddWithValue("@RAID", Convert.ToString(row["Raid"].ToString()));
cmd.Parameters.AddWithValue("@NPARTE", Convert.ToString(row["Nparte"].ToString()));
cmd.Parameters.AddWithValue("@CANTIDAD", Convert.ToString(row["Cantidad"].ToString()));
cmd.Parameters.AddWithValue("@VENTANA", Convert.ToString(row["Ventana"].ToString()));
cmd.Parameters.AddWithValue("@LIDER", Convert.ToString(row["Lider"].ToString()));
cmd.Parameters.AddWithValue("@FECHA", Convert.ToString(row["Fecha"].ToString()));
con.Open();
cmd.ExecuteNonQuery();
con.Close();
}
}
MessageBox.Show("Datos Agregados");
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
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How do you know it's not saving the data? I see that you are using the executable path for the location of the database, so I assume that you have it in a root folder of your project. So, when you build, the file is (in all probability) copied over the one in the executable location. You have two possible fixes:
1. Change the file property in Visual Studio so that it only copies when newer.
2. Don't use the executable location.
Option 2 is the better choice because you won't be able to update the data in the database once you install it into a protected folder such as inside Program Files. You should look to use AppData to store your file instead.
This space for rent
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As Pete says, the database location is probably relevant here - you should never store data in the app folder as it tends to work in development, but fail in production. The reason for that is that in production it's installed under "Program Files" (or its x86 equivelant) which is protected from changes by the system to help prevent virus activity.
Have a look here: Where should I store my data?[^] - it shows some better places, and how to access them.
In addition, it's a poor idea to just us an anonymous INSERT - you should list the columns in the order you are going to INSERT them as this means your code is more resilient to changes in your DB. Use:
INSERT INTO ENVIO (Raid, Nparte, Cantidad, Ventana, Lider, Fecha) VALUES (@RAID, @NPARTE, @CANTIDAD, @VENTANA, @LIDER, @FECHA) (Or similar) instead.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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I have a rather complicated class describing an xml structure, I've been using the .net XmlSerializer and its has worked for almost all of my purposes except for one very important kink.
I have an element deep in my xml object where the rules are no more. The element has text and xml elements mingled in with the text. Like so.
<KnownElement>
Here is some text <c>This is important text</c> here is some more text <c>Yet more important text stuff</c> more text
</KnownElement>
I need to be able to know at the very least, where the text is and where the important text is (which can assume different tags by the way, so need to know which tags they assume too), in regards to each other.
This is as close as I've gotten to a solution.
public class KnownElement
{
[XmlAnyElement]
public XmlElement[] DocumentNodes { get; set; }
[XmlText]
public string[] Text { get; set; }
}
This allows me to retrieve the nodes for the important text as well as the text that isn't in a node, but inside the KnownElement. The only problem is I have no idea in which order they're all are in the grand scheme. The DocumentNodes property returns an ordered enumeration of the nodes (important text) inside KnownElement, and the Text property returns an array of strings of which are an ordered occurrence of text separated by nodes.
This is neat, but say I have only one node, and one text... I have no idea if the text came before or after the node.
Is there anyway to get the desired effect without me throwing up a xmlreader or something like that...? I would hate to iterate through the HUGE structure this little bit is found within.
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"If thine eye ("c" in this case) offends thee, pluck it out!".
Do a "change all" on any
" <c>" and
"</c> " to some other harmless tag or token.
(These should have been "HTML escaped")
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I have a Bat file that I can load outside of C# but wanted to have it inside of C# to be more secure(load it inside of the exe of C# code).
I can't wrap it out my head on how you would load a batch file inside from C#. Here is my code on how to load it outside of C#:
try
{
var newProcessInfo = new System.Diagnostics.ProcessStartInfo();
newProcessInfo.FileName = @"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe";
newProcessInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
newProcessInfo.Verb = "runas";
newProcessInfo.Arguments = @"-executionpolicy unrestricted -Command "".\power\gwx\uninstallgwx.bat""";
System.Diagnostics.Process.Start(newProcessInfo);
MessageBox.Show("Windows 10 Updater uninstalled");
}
catch
{ }
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Powershell is for powershell-scripts. Batch-files are executed on the console (cmd.exe), using the Proces class.
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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You cannot "load a batch file" and there is no such thing as "load it inside C#".
Your application would have to be written as an interpreter for a BAT file to be "more secure".
Old batch files have to be written to disk in order to be executed, thereby defeating your "security".
Powershell scripts can be executed inside your application, but you have to host the execution environment in your app. The script can come from a string resource inside your app.
Really, what are you securing? There's nothing in these scripts that should be that earth shattering as everything would be in clear text, including any passwords. Putting a password in a text file is just plain stupid.
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Thank you! I just didn't want to have the files all packed away in a folder to make it easier for the user.
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Last weak my teacher says that it's better to not use the C#6 code for ASP.NET MVC web applications like below but he didn't say why. Can you explain me why?
using static system.Math;
string text = $"hello, {yourName}! the square root of 5 is {Sqrt(5)}.";
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That's his humble opinion, that's all.
There is no concrete reason for his statement.
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As Dave said, that's your teacher's opinion. The only person who can explain why he holds that opinion is your teacher. 
Personally, I dislike the using static syntax, and would never consider using it. I think a lot of the other C# 6 features make your code much cleaner and easier to read. The only time I'd avoid using them would be if I had to share the project with someone using Visual Studio 2013 or earlier.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Did your teacher mean they didn't like ALL the new features of C# 6, or that they didn't like the new extended semantics of the 'using statement ? uhhh ... how can we possibly know ?
Perhaps your teacher is concerned about this:
"Using static imports only accessible static members and nested types declared in the specified type. Inherited members are not imported." Or,this: "Using static makes extension methods declared in the specified type available for extension method lookup. However, the names of the extension methods are not imported into scope for unqualified reference in code" [^].
So, you might ask your teacher, gently, if they meant you should not do your assignments compiling with C#6, or just not to use the new features in C# 6.
«There is a spectrum, from "clearly desirable behaviour," to "possibly dodgy behavior that still makes some sense," to "clearly undesirable behavior." We try to make the latter into warnings or, better, errors. But stuff that is in the middle category you don’t want to restrict unless there is a clear way to work around it.» Eric Lippert, May 14, 2008
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I get an error when trying to access a non-user mailbox (Process MailBox): "The SMTP address has no mailbox associated with it."
This is the code I use. This has been working since 2010; but stopped working last week.
static void Test()
{
string MailBoxAdd = "xxxx.xx@dom.com";
ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2013_SP1);
service.UseDefaultCredentials = true;
service.AutodiscoverUrl(MailBoxAdd, RedirectionUrlValidationCallback);
ItemView view = new ItemView(10);
view.PropertySet = new PropertySet(BasePropertySet.IdOnly, ItemSchema.Subject, ItemSchema.DateTimeReceived, ItemSchema.HasAttachments);
FolderId folder = new FolderId(WellKnownFolderName.Inbox, new Mailbox(MailBoxAdd));
FindItemsResults<Item> findResults = service.FindItems(folder, view);
}
Appreciate your help...
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PLease do not post the same thing in multiple places: it duplicates work and that annoys people.
You have this posted in QA, so leave it there.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Hello,
I want to implement a feature of floating window (similar to dropbox which floats when we open File editors like excel) using .net.
I want to trigger a popup window, only when windows explorer is in foreground.
How to do this?
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Hello,
What I need is a table with two columns.
1 column gives an assignment such as "Baker" or "Miller".
column #2 is where a user can enter a name anytime, on the fly.
The logic will assign person X to the "Baker" or "Miller" role.
The issue here is that the Person class has many more attributes. And I'll need to make this so if someone is assigned the "Miller" role, then it can assign the "Miller" to the proper "environment" class. E.g. "Bob" is a "Miller" and should work in a "Bakery".
So far, I have a People class, a Jobs class, and an Environment class. I was thinking of having the Jobs class inherit the people class to use their functions, and the environment class inherit from the jobs class... But now I'm thinking this won't work at all and am a bit confused.
Any thoughts would be GREATLY appreciated.
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Things will make more sense when you consider your object relationships in the context of composition (i.e. "has-a") versus inheritance ("is-a"), which is what you are doing.
You would use object references / "links" between people, jobs and environments in this case; versus sub-classing:
- Each person can be assigned one or more jobs (?)
- A job is performed in which environment(s)
Jobs and environments, however, could easily be sub-classed from other classes; e.g. Jobs - Engineering - Mechanical - etc.
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Just to expound on what Gerry said, what you're talking about is a property relationship rather than a polymorphic one. You'll likely find you're best served by using a mapping class like so:
public class Person
{
public string Name { get; protected set; }
...
}
public class Role
{
string Title { get; protected set; }
...
}
public class RoleAssignment
{
public Person Person { get; protected set; }
public Role Role { get; protected set; }
}
public class Environment
{
public IEnumerable<RoleAssignment> Roles{ get; protected set; }
...
}
"There are three kinds of lies: lies, damned lies and statistics."
- Benjamin Disraeli
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You use the word "table" here: are you talking about a DataTable, or DataTables in a DataSet ?
It is not clear to me if you need a database with three DataTables ... for Persons, for Work Roles, for Work Environments, or, if the "business rules" are so clear-cut that you can user fewer DataTables: for example, if a "Baker" always works in a "Bakery" do you have to have a separate DataTable of Bakeries.
If each "entity" (Person, Work-Role, Work Environment) has multiple instances, then, yes, you need multiple DataTables/Classes.
I suggest you make an outline of the functionality you need in the "final product," and, then, work backwards from that, and revise your question here to be clearer.
«There is a spectrum, from "clearly desirable behaviour," to "possibly dodgy behavior that still makes some sense," to "clearly undesirable behavior." We try to make the latter into warnings or, better, errors. But stuff that is in the middle category you don’t want to restrict unless there is a clear way to work around it.» Eric Lippert, May 14, 2008
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