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  • Incorrect new Uri(base, relative) behaviour in .NET

    - by dr. evil
    When you create a new Uri like this: New Uri(New Uri("http://example.com/test.php"),"?x=y") it returns: http://example.com/?x=y It was supposed to return: http://example.com/test.php?x=y according to the every major browser out there (I'm not quite sure what RFC says though). Is this is a bug or is there any other function out there which behaves correctly, also what's the best way to fix it without reinventing the wheel?

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  • how to make the printer window appear using vb.net 2010

    - by Jeline Esase
    hi I have this code that will send my panel into a printer but the problem is it doesent let me choose which printer I will use any idea on how can I make the printer window appear? thanks Public Class Form1 Dim img As Bitmap Dim WithEvents pd As PrintDocument 'Returns the Form as a bitmap Function CaptureForm1() As Bitmap Dim g1 As Graphics = Me.CreateGraphics() Dim MyImage = New Bitmap(Me.ClientRectangle.Width, (Me.ClientRectangle.Height), g1) Dim g2 As Graphics = Graphics.FromImage(MyImage) Dim dc1 As IntPtr = g1.GetHdc() Dim dc2 As IntPtr = g2.GetHdc() BitBlt(dc2, 0, 0, Me.ClientRectangle.Width, (Me.ClientRectangle.Height), dc1, 0, 0, 13369376) g1.ReleaseHdc(dc1) g2.ReleaseHdc(dc2) 'saves image to c drive just, u can comment it also 'MyImage.Save("c:\abc.bmp") Return MyImage End Function <DllImport("gdi32.DLL", EntryPoint:="BitBlt", _ SetLastError:=True, CharSet:=CharSet.Unicode, _ ExactSpelling:=True, _ CallingConvention:=CallingConvention.StdCall)> _ Private Shared Function BitBlt(ByVal hdcDest As IntPtr, ByVal nXDest As Integer, ByVal nYDest As Integer, ByVal nWidth As Integer, ByVal nHeight As Integer, ByVal hdcSrc As IntPtr, ByVal nXSrc As Integer, ByVal nYSrc As Integer, ByVal dwRop As System.Int32) As Boolean ' Leave function empty - DLLImport attribute forwards calls to MoveFile to ' MoveFileW in KERNEL32.DLL. End Function Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click img = CaptureForm1() pd = New PrintDocument pd.Print() End Sub 'this method will be called each time when pd.printpage event occurs Sub pd_PrintPage(ByVal sender As Object, ByVal e As PrintPageEventArgs) Handles pd.PrintPage Dim x As Integer = e.MarginBounds.X Dim y As Integer = e.MarginBounds.Y e.Graphics.DrawImage(img, x, y) e.HasMorePages = False End Sub End Class

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  • How can I properly handle 404s in ASP.NET MVC?

    - by Brian
    I am just getting started on ASP.NET MVC so bear with me. I've searched around this site and various others and have seen a few implementations of this. EDIT: I forgot to mention I am using RC2 Using URL Routing: routes.MapRoute( "Error", "{*url}", new { controller = "Errors", action = "NotFound" } //404s ); The above seems to take care of requests like this (assuming default route tables setup by initial MVC project): "/blah/blah/blah/blah" Overriding HandleUnknownAction() in the controller itself: //404s - handle here (bad action requested protected override void HandleUnknownAction(string actionName) { ViewData["actionName"] = actionName; View("NotFound").ExecuteResult(this.ControllerContext); } However the previous strategies do not handle a request to a Bad/Unknown controller. For example, I do not have a "/IDoNotExist", if I request this I get the generic 404 page from the web server and not my 404 if I use routing + override. So finally, my question is: Is there any way to catch this type of request using a route or something else in the MVC framework itself? OR should I just default to using Web.Config customErrors as my 404 handler and forget all this? I assume if I go with customErrors I'll have to store the generic 404 page outside of /Views due to the Web.Config restrictions on direct access. Anyway any best practices or guidance is appreciated.

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  • Extending the .NET type system so the compiler enforces semantic meaning of primitive values in cert

    - by Drew Noakes
    I'm working with geometry a bit at the moment and am converting a lot between degrees and radians. Unfortunately, both of these are represented by double, so there's compile time warning/error if I try to pass a value in degrees where radians are expected. I believe F# has a compile-time solution for this (called units of measure.) I'd like to do something similar in C#. As another example, imagine a SQL library that accepts various query parameters as strings. It'd be good to have a way of enforcing that only clean strings were allowed to be passed in at runtime, and the only way to get a clean string was to pass through some SQL injection attack preventing logic. The obvious solution is to wrap the double/string/whatever in a new type to give it the type information the compiler needs. I'm curious if anyone has an alternative solution. If you do think wrapping is the only/best way, then please go into some of the downsides of the pattern (and any upsides I haven't mentioned too.) I'm especially concerned about the performance of abstracted primitive numeric types on my calculations at runtime.

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  • COM port - how to identify a device (.net/c#)

    - by argh
    Hi, I'm programming for Windows CE and I need to connect to a scanner. There is no problem - I know that it is on port COM0, but if I plug in another device earlier it gets another COM port... to get all com ports the easy way is: SerialPort.GetPortNames() But I don't know how to identify a device? Is there any standard way? I can't 'ping' it since there is one device that only sends data... it spams data all the time... and I don't know how to 'ping' a device...

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  • Customising the .NET PrintPreviewDialog?

    - by Gary Willoughby
    Currently i'm using the PrintPreviewDialog to open a window to preview the printed pages before they are sent to a printer. The problem is though that it first appears very small, at the top left of the screen and the buttons are too small. Is there anyway i can set a starting size for this dialog or start position or even make the little buttons a little bigger? Or do i need to implement my own?

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  • sftp for .net c#

    - by d daly
    Hi my boss has asked me to come up with a test page which can handle sftp of a file from one internal server to another. As Ive never done this before I was wondering if anyone could give me a shove in the right direction please? thanks DD

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  • redirect an event in VB.NET

    - by serhio
    I havea a UserControl1 (in witch I have an Label1) in Form1. I want to catch the MouseDown event from label and send it like from UserControl I do: Public Class UserControl1 Shadows Custom Event MouseDown As MouseEventHandler AddHandler(ByVal value As MouseEventHandler) AddHandler Label1.MouseDown, value End AddHandler RemoveHandler(ByVal value As MouseEventHandler) RemoveHandler Label1.MouseDown, value End RemoveHandler RaiseEvent(ByVal sender As Object, ByVal e As MouseEventArgs) 'RaiseMouseEvent(Me, e) ??? ' End RaiseEvent End Event End Class However, when I set in the Form1 the UserControl Private Sub UserControl11_MouseDown(ByVal sender As System.Object, _ ByVal e As System.Windows.Forms.MouseEventArgs) _ Handles UserControl11.MouseDown MessageBox.Show(sender.GetType.Name) 'here I have 'Label', want 'UserControl' End Sub

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  • How to Select Multiple Records from Multiple Tables at Once - SQL Server/C#/.NET/T-SQL

    - by peace
    I have two tables Customer and CustomerPhone. Customer usually has multiple phone numbers, so when i run select statement on customer 101, i will get multiple records due to the multiple phone numbers. As you see below all the "Phone" and "Fax" field belongs to CustomerPhone table. These are considered as two records in the CustomerPhone table whereas the rest of fields relate to Customer table which is a single record. What should i do to fill Phone and Fax field in this case? Should i run select statement on CustomerPhone first and then run select statement on Customer?

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  • .NET multithreading, volatile and memory model

    - by fedor-serdukov
    Assume that we have the following code: class Program { static volatile bool flag1; static volatile bool flag2; static volatile int val; static void Main(string[] args) { for (int i = 0; i < 10000 * 10000; i++) { if (i % 500000 == 0) { Console.WriteLine("{0:#,0}",i); } flag1 = false; flag2 = false; val = 0; Parallel.Invoke(A1, A2); if (val == 0) throw new Exception(string.Format("{0:#,0}: {1}, {2}", i, flag1, flag2)); } } static void A1() { flag2 = true; if (flag1) val = 1; } static void A2() { flag1 = true; if (flag2) val = 2; } } } It's fault! The main quastion is Why... I suppose that CPU reorder operations with flag1 = true; and if(flag2) statement, but variables flag1 and flag2 marked as volatile fields...

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  • How do I truncate a .NET string?

    - by Steve Guidi
    I apologize for such a question that likely has a trivial solution, but I strangely could not find a concise API for this problem. Essentially, I would like to truncate a string such that it its length is not longer than a given value. I am writing to a database table and want to ensure that the values I write meet the constraint of the column's datatype. For instance, it would be nice if I could write the following: string NormalizeLength(string value, int maxLength) { return value.Substring(0, maxLength); } Unfortunately, this raises an exception because maxLength exceeds the string boundaries. Of course, I could write a function like the following, but I was hoping that something like this already exists. string NormalizeLength(string value, int maxLength) { return value.Length <= maxLength ? value : value.Substring(0, maxLength); } Where is the elusive API that performs this task? Is there one?

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  • VB.Net 2008 Chrome or Firefox control

    - by AndyD273
    I'm trying to figure out a way to have multiple sessions at the same website at the same time. I've been using the SHDocVw.InternetExplorer control in Visual Studio 2008 to open a web browser and log in, but at times we need to use a separate login. I haven't found a way to do this using just internet explorer (it just uses the credentials of the first login), so I figure if I can find a similar control for another brower that allows DOM level access then I can just use that. If anyone knows of anything I can try that would be very helpful.

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  • Creating a blocking Queue<T> in .NET?

    - by spoon16
    I have a scenario where I have multiple threads adding to a queue and multiple threads reading from the same queue. If the queue reaches a specific size all threads that are filling the queue will be blocked on add until an item is removed from the queue. The solution below is what I am using right now and my question is: How can this be improved? Is there an object that already enables this behavior in the BCL that I should be using? internal class BlockingCollection<T> : CollectionBase, IEnumerable { //todo: might be worth changing this into a proper QUEUE private AutoResetEvent _FullEvent = new AutoResetEvent(false); internal T this[int i] { get { return (T) List[i]; } } private int _MaxSize; internal int MaxSize { get { return _MaxSize; } set { _MaxSize = value; checkSize(); } } internal BlockingCollection(int maxSize) { MaxSize = maxSize; } internal void Add(T item) { Trace.WriteLine(string.Format("BlockingCollection add waiting: {0}", Thread.CurrentThread.ManagedThreadId)); _FullEvent.WaitOne(); List.Add(item); Trace.WriteLine(string.Format("BlockingCollection item added: {0}", Thread.CurrentThread.ManagedThreadId)); checkSize(); } internal void Remove(T item) { lock (List) { List.Remove(item); } Trace.WriteLine(string.Format("BlockingCollection item removed: {0}", Thread.CurrentThread.ManagedThreadId)); } protected override void OnRemoveComplete(int index, object value) { checkSize(); base.OnRemoveComplete(index, value); } internal new IEnumerator GetEnumerator() { return List.GetEnumerator(); } private void checkSize() { if (Count < MaxSize) { Trace.WriteLine(string.Format("BlockingCollection FullEvent set: {0}", Thread.CurrentThread.ManagedThreadId)); _FullEvent.Set(); } else { Trace.WriteLine(string.Format("BlockingCollection FullEvent reset: {0}", Thread.CurrentThread.ManagedThreadId)); _FullEvent.Reset(); } } }

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  • what are all the Optimize tricks that you know for asp.net code ?

    - by Aristos
    After some time of many code programming on asp.net, I discover the very big speed different between string and StringBuilder. I know that is very common and known but I just mention it for start. The second think that I have found to speed up the code, is to use the const, and not the static, for declare my configuration constants value (especial the strings). With the const, the compiler not create new object, but just place the value, on the point that you have ask it, but with the static declaration, is create a new memory object and keep its on the memory. My third trick, is when I search for string, I use hash values, and not the string itself. For example, if I need a List<string SomeValues, and place inside strings that I need to search them, I prefer to use List<int SomeHashValue, and I use the hash value to locate the strings. My forth thought that I was wandering, is if is better to place big strings in one line, or separate them in different lines with the + symbol to be more easy to read out. I make some tests and see that the compiler make a good job is some split the string, in many lines, using the + symbol. What other tricks/tips do you know and use on your programming to make it run faster, and maybe use less memory. Well I know, that some times, to make something run faster, you need more memory, more cache. My priority is on speed. Because Speed Counts.

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  • Please Help me to create a replace function in vb.net

    - by Rajesh Rolen- DotNet Developer
    Please Help me in creating a replace function. Problem: Their is a alfanumeric value of any lenght (string) and i want to replace its all characters with 'X' except right four characters Like : Value : 4111111111111111 Result Should be: XXXXXXXXXXXX1111 I have created a function but got stuck: public function myfunction(str as string) str.Replace(str.Substring(0, str.Length - 5), 'X') 'but here i want no of x to be equvals to count of lenght of str - 4 end function please tell me a better fuction to perform such a operation

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  • memory usage in C# (.NET) app is very high, until I call System.GC.Collect()

    - by Chris Gray
    I've written an app that spins a few threads each of which read several MB of memory. Each thread then connects to the Internet and uploads the data. this occurs thousands of times and each upload takes some time I'm seeing a situation where (verified with windbg/sos and !dumpheap) that the Byte[] are not getting collected automatically, causing 100/150MB of memory to be reported in task manager if I call System.GC.Collect() i'm seeing a huge drop in memory, a drop of over 100MB I dont like calling System.GC.Collect() and my PC has tons of free memory. however if anyone looks at TaskManager they're going to be concerned, thinking my app is leaking horribly. tips?

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  • ASP.NET/C#: How to use a Subclassed Control on a Page?

    - by Bob Kaufman
    I've subclassed DropDownList to add functionality specific to my application: public class MyDropDownList : DropDownList { ... } ... then referenced it in Web.Config, which is where I figure things start to go wrong: <pages theme="Main"> <controls> <add tagPrefix="bob" tagName="MyDropDownList" src="~/Components/MyDropDownList.cs" /> </controls> </pages> my reference to it does not work: <tr><td>Category</td> <td><bob:MyDropDownList runat="server" ID="Category"... /> and my best clue is the complier error message: "The file 'src' is not a valid [sic] here because it doesn't expose a type." I figure I'm misapplying knowledge of how to create a Web User Control here. What I want to be able to do is refer to this control on an ASP.NET page just like I would the parent DropDownList. Refactoring back into a Web User Control that contains a DropDownList is not desirable, because I want to apply a RequiredFieldValidator to it.

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  • Intermittent asp.net mvc exception: “A public action method ABC could not be found on controller XYZ

    - by Chris Schoon
    Hi, I'm getting an intermittent exception saying that asp.net mvc can’t find the action method. Here’s the exception: A public action method 'Fill' could not be found on controller 'Schoon.Form.Web.Controllers.ChrisController'. I think I have the routing set up correctly because this application works most of the time. Here is the controller’s action method. [ActionName("Fill")] [AcceptVerbs(HttpVerbs.Get | HttpVerbs.Post), UserIdFilter, DTOFilter] public ActionResult Fill(int userId, int subscriberId, DisplayMode? mode) { //… } The route: routes.MapRoute( "SchoonForm", "Form/Fill/{subscriberId}", new { controller = "ChrisController", action = "Fill" }, new { subscriberId = @"\d+" } ); And here is the stack: System.Web.HttpException: A public action method 'Fill' could not be found on controller 'Schoon.Form.Web.Controllers.ChrisController'. at System.Web.Mvc.Controller.HandleUnknownAction(String actionName) in C:\dev\ThirdParty\MvcDev\src\SystemWebMvc\Mvc\Controller.cs:line 197 at System.Web.Mvc.Controller.ExecuteCore() in C:\dev\ThirdParty\MvcDev\src\SystemWebMvc\Mvc\Controller.cs:line 164 at System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) in C:\dev\ThirdParty\MvcDev\src\SystemWebMvc\Mvc\ControllerBase.cs:line 76 at System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) in C:\dev\ThirdParty\MvcDev\src\SystemWebMvc\Mvc\ControllerBase.cs:line 87 at System.Web.Mvc.MvcHandler.ProcessRequest(HttpContextBase httpContext) in C:\dev\ThirdParty\MvcDev\src\SystemWebMvc\Mvc\MvcHandler.cs:line 80 at System.Web.Mvc.MvcHandler.ProcessRequest(HttpContext httpContext) in C:\dev\ThirdParty\MvcDev\src\SystemWebMvc\Mvc\MvcHandler.cs:line 68 at System.Web.Mvc.MvcHandler.System.Web.IHttpHandler.ProcessRequest(HttpContext httpContext) in C:\dev\ThirdParty\MvcDev\src\SystemWebMvc\Mvc\MvcHandler.cs:line 104 at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) Here is an example of my filters they all work the same way: public class UserIdFilter : ActionFilterAttribute { public override void OnActionExecuting(ActionExecutingContext filterContext) { const string Key = "userId"; if (filterContext.ActionParameters.ContainsKey(Key)) { filterContext.ActionParameters[Key] = // get the user id from session or cookie } base.OnActionExecuting(filterContext); } } Thanks, Chris

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  • is it possible to lock oracle 10g database table with C#/(ADO?).NET 2.0

    - by matti
    I have a table that contains a maximum value that needs to be get and set by multiple programs. How can I lock the table for a while when old value is got and new is updated in C#? In other words: string sql = "lock table MaxValueTable in exclusive mode"; using (DbCommand cmd = cnctn.CreateCommand()) { cmd.CommandText = sql; // execute command somehow!! } maxValue = GetMaxValue(); SetMaxValue(maxValue + X); sql = "lock table MaxValueTable in share mode"; using (DbCommand cmd = cnctn.CreateCommand()) { cmd.CommandText = sql; // execute command somehow!! } -BR: Matti

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  • jQuery "growl-like" effect in VB.net

    - by StealthRT
    Hey all, i have made a simple form that mimiks the jQuery "GROWL" effect seen here http://www.sandbox.timbenniks.com/projects/jquery-notice/ However, i have ran into a problem. If i have more than one call to the form to display a "Growl" then it just refreshes the same form with whatever call i send it. In other words, i can only display one form at a time instead of having one drop down and a new one appear above it. Here is my simple form code for the "GROWL" form: Public Class msgWindow Public howLong As Integer Public theType As String Private loading As Boolean Protected Overrides Sub OnPaint(ByVal pe As System.Windows.Forms.PaintEventArgs) Dim pn As New Pen(Color.DarkGreen) If theType = "OK" Then pn.Color = Color.DarkGreen ElseIf theType = "ERR" Then pn.Color = Color.DarkRed Else pn.Color = Color.DarkOrange End If pn.Width = 2 pe.Graphics.DrawRectangle(pn, 0, 0, Me.Width, Me.Height) pn = Nothing End Sub Public Sub showMessageBox(ByVal typeOfBox As String, ByVal theMessage As String) Me.Opacity = 0 Me.Show() Me.SetDesktopLocation(My.Computer.Screen.WorkingArea.Width - 350, 15) Me.loading = True theType = typeOfBox lblSaying.Text = theMessage If typeOfBox = "OK" Then Me.BackColor = Color.FromArgb(192, 255, 192) ElseIf typeOfBox = "ERR" Then Me.BackColor = Color.FromArgb(255, 192, 192) Else Me.BackColor = Color.FromArgb(255, 255, 192) End If If Len(theMessage) <= 30 Then howLong = 4000 ElseIf Len(theMessage) >= 31 And Len(theMessage) <= 80 Then howLong = 7000 ElseIf Len(theMessage) >= 81 And Len(theMessage) <= 100 Then howLong = 12000 Else howLong = 17000 End If Me.opacityTimer.Start() End Sub Private Sub opacityTimer_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles opacityTimer.Tick If Me.loading Then Me.Opacity += 0.07 If Me.Opacity >= 0.8 Then Me.opacityTimer.Stop() Me.opacityTimer.Dispose() Pause(howLong) Me.loading = False Me.opacityTimer.Start() End If Else Me.Opacity -= 0.08 If Me.Opacity <= 0 Then Me.opacityTimer.Stop() Me.Close() End If End If End Sub Public Sub Pause(ByVal Milliseconds As Integer) Dim dTimer As Date dTimer = Now.AddMilliseconds(Milliseconds) Do While dTimer > Now Application.DoEvents() Loop End Sub End Class I call the form by this simple call: Call msgWindow.showMessageBox("OK", "Finished searching images.") Does anyone know a way where i can have the same setup but would allow me to add any number of forms without refreshing the same form over and over again? Like always, any help would be great! :) David

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  • .Net Designer assemblies, C++\C# error

    - by greggorob64
    I'm working on an designer-heavy application (using Visual C++ 2.0, but a C# solution should still be relevant). My setup is this: I have a UserControl named "Host" I'm attempting a UserControl named "Child" Child contains a property to a class whose type is defined in a different dll entirely, named "mytools.dll" Child works just fine in the designer. However, when I go to drag "child" onto "host" from the designer, I get the following error: Failed to create component 'Child'. The error message follows: 'System.io.filenotfoundexception: could not load file or assembly MyTools, Version XXXXXX, Culture=neutral ..... {unhelpful callstack} If I comment out the property in "child" that points to the class in mytools.dll, everything designs just peachy. I have the property marked with "Browsable(false), and DesignerSerializable(hidden), and it does not help. Is there a way for me to explicitly say "Don't load this dll, you won't need it in design time", or some way for me to force a dll to load from the designer programmatically? Thanks!

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