.net - Does Not Throw Compiler Error When Setting Dictionary To IList
Jul 6, 2011
I am updating a legacy application, and it was reading a dll from another project for a Dictionary(of Guid, String) of items and using them.
The requirements have changed, and the method that was returning the Dictionary is now returning an IList.
This is the odd behavior of this; the intellisense is not throwing a cast error, nor is the compiler. It does not throw an error until runtime when it tries to set the Dictionary to the IList.
Example:
Dim someDictionary As Dictionary(Of Integer, String) = New Dictionary(Of Integer, String)
Dim someList As IList(Of Integer)
someDictionary = someList
why the compiler is not catching this?
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Jul 1, 2011
This error first appear to occur randomly. Steps to recreate:Open Visual Studio and load a solution (some files automatically opened) - this is when the problem occurs Close all open files Restart visual studio and load solution (no issues)Open Exactly the same files again, restart visual studio and load solution so files open automatically (problem occurs!)
However, when trying to narrow it down to a single file (that is automatically opened when the solution is loaded), I couldn't reproduce the problem. Now with all the files open again the problem doesn't occur!!! So it looks like it is fixed - though this happened before and eventually the issue came back.
I think it is to do with one of the user controls with DevExpress controls on it - when the error occurs, the designer displays the error. Though I can't reproduce it at the moment to confirm that.
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Aug 2, 2011
I'm trying to use a variable that is simply a list of a list of strings.I've declared it as follows:
Dim iRows As New List(Of List(Of String))
Then I'm trying to pass it as a parameter to another method and I've defined the method as follows:
Public Sub Import(ByVal Rows As IList(Of IList(Of String)))
For Each Row As IList(Of String) In Rows
ImportRow(Row)[code]....
Unfortunately, when I try to run that code I get the following error where it tries to pass my variable to my method.
System.InvalidCastException was unhandled by user code
Message="Unable to cast object of type 'System.Collections.Generic.List1[System.Collections.Generic.List1[System.String]]' to type 'System.Collections.Generic.IList1[System.Collections.Generic.IList1[System.String]]'."
When I change the method definition to use the types rather than the interfaces as follows, it works.
Public Sub Import(ByVal Rows As List(Of List(Of String)))
For Each Row As IList(Of String) In Rows
ImportRow(Row)[code]....
So, is it not possible to use generics with interfaces in this way? It works fine as long as I'm not nesting them.
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Dec 6, 2011
I have set up text boxes to count how many times a certain item appears in my DataGridView but I want it to reset every time I click on a new index in a list box. How do I do it? Here is my code:
Dim myDict As New Dictionary(Of String, Interger)
Dim machineName As String
For Each row As DataGridView In grdTest.Rows
machineName = row.Cells("ProtosDataGridViewTextBoxColumn").Value.ToString()
If myDict.keys.Contains(machineName) Then
[Code]...
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May 4, 2009
I wanted a Message Box to appear when a file can't be found, for example. I made a Combo Box (ComboBox1) and a button, this is what the code was:[code]If a file can't be found, I want a message box to appear, not an Error Provider, I tried this code, but it did not work:[code]
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Jul 28, 2011
I'm trying to convert a batch of .pngs to .jpgs, as in this question:
[Code]....
The call to jpg.Save, however, with a "generic error" in GDI+. Originally outside of the innermost Using statement, I moved the call inwards as per this answer, but it didn't change anything. I have verified that newfile contains a valid path, and that the program has write access to the directory. What am I missing?
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Apr 14, 2011
Below, why doesn't Throw maintain my originating line number? If I run the DerivedPage, my log file lists the error as line 7. Shouldn't it say line 4? It would make sense if I had Throw ex, but I don't. Isn't Throw by itself just supposed to rethrow and bubble up the error? If I remove the Try...Catch block entirely in DerivedPage, then my log file correctly lists 3 as the error line, but I am not able to log any info in case of an error. What can I do to maintain my DerivedPage, and still have my log keep the correct line number?
Public Class DerivedPage Inherits BasePage
Page_Load(o,e)
Try
[CODE]...
Base page:
Public Class BasePage
Protected Overrides Sub OnError(e)
MyBase.OnError(e)
[CODE]...
Log.Error does output the InnerException if it exists. It does in this case. However, the stack trace for the InnerException doesn't contain a line number, just the Exception details.
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Nov 13, 2009
I want to check if an IP address can be resolved to a hostname.I figured I would use System.Net.Dns.GetHostEntry as System.Net.Dns. GetHostByAddress is shown as obsolete in VS2008.
However,if I specify an invalid IP address to System.Net.Dns.GetHostEntry the HostName property equals the IP address I gave. If I use System.Net.Dns.GetHostByAddress it, rightly, gives a resolution error.I don't mind continuing to use System.Net.Dns. GetHostByAddress but is there any way to have System.Net.Dns.GetHostEntry throw an error if the IP address cannot be resolved to a hostname (other than by checking if the IP address given equals the hostname returned, I mean)
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Feb 3, 2009
I am running visual studio 2008 with SP1 installed. I have a solution which has 7 projects. One of the vb files (which has some 15000 lines) is freezing the visual studio and when i close the studio it shows the visual basic compilation error. I have tested the solution in other workstations and it is running fine. I tried repairing visual studio and i tried reparing 3.5 sp1.
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Apr 11, 2011
I've found a difference in overload resolution between the C# and the VB-compiler. I'm not sure if it's an error or by design:
[Code]...
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Feb 21, 2011
I teach programming in Visual Basic 2010 Express Edition and I have one blind student in my class and it is essentiall for him to turn off every functional underline in text editor of Visual Basic enviroment.I know how to turn off intellisense. I know how to turn off green underline (warning), but I don't know how to turn off blue wavy underline (compiler error) in Visual Basic text editor.I found plenty of advices on web forums, but everything is about that should be possibility same like in C# (I use as well) -
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Sep 25, 2009
which compiler errors would be detected out by VB compiler?
I have searched out some compiler errors list for C#, for example, see the website at [URL]
MS provided us the information about C# compiler error. Does MS provide VB compiler errors information as well.VS
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Jun 12, 2010
I get the following error when trying to compile the simplest prpgram. Error 1 Class 'CLSID_CorSymWriter' could not be created: System Error &H80040154& After looking at other stuff on the net I removed VB 2010, VB 2008, any C or C++ runtimes and any .NET Framework programs I could find, and then re-installed VB 2010, but the problem still persists.
[Code]...
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Oct 1, 2009
I get an error "vb6 compiler gives an error Error in loading dll" and the compiler point to code line with "If Request.Form("EDAServerName") <> "" Then" and the word Request hilited. I searched many places with no help. Does any one know of resolution ??
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Jul 16, 2010
I'm getting this error in an open source project that runs fine on a dev machine with iis7, but breaks in iis6. Has anybody else gotten this message or is there a way to decifer it?
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Feb 3, 2011
I just found an error in the compiler. Newpath is a boolean and the compiler took and ran this[code....
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Jan 5, 2006
i just want to know when is going to be released the fix for visual basic compiler error &H8013141e& ? this is already reported in the microsoft productfeedback site. do not repond that i should go back to vs.2003 because i have lots of code developed in VS 2005 to framework 2.0.
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Dec 3, 2009
I get the follow error in VS 2010 Beta 2 VB[code]...
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Nov 11, 2010
Imports System.CodeDom.Compiler
Public Class iCompiler
Public Shared Sub GenerateExecutable(ByVal Output As String, ByVal Source As String, ByVal Icon As String)[code].....
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Aug 11, 2006
I have a VB 2005 WinForms Project which is giving what I think is a false error.On the Designer screen for the main form (which normally displays the form layout etc.) I get:One or more errors encountered while loading the designer. The errors are listed below. Some errors can be fixed by rebuilding your project, while others may require code changes.'. ctor' is not a valid identifier.
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Jun 21, 2011
I am working on my new server now. I have created very simple page which has a for loop on code behind. If i dont define "i" as integer before the loop, i got this error
Compiler Error Message: BC30451: Name 'i' is not declared.
But, i can use for loops without declaration of "i" before loop.
For i = 1 To 10
Response.Write(DateTime.Now.ToString)
Next
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Aug 24, 2009
I need instructions on how to install a 'WithEvents' into a sqlsever web form, read Server Error message:Description:An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.Compiler Error Message: BC30506: Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
[code]....
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Mar 6, 2009
For those who still have lots of legacy code as I do in .NET 1.1, has anyone found a solution for this issue[url]...
The directory given in the command line will not exist, which makes sense given the error message. The problematic part is that everything works with a full rebuild. Since the "work around" is so easy, Microsoft of course is not going to fix the problem for .net 1.1.
To everyone who pre-emptively suggests an upgrade to .net 2.0+, that is not an acceptable solution, due to time limits and resources. To those who say that is not an acceptable excuse, go find another thread, not every company is perfect.
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Dec 8, 2011
I have a method that looks like this :
Function ExecuteAndLogError(Of TResult)(ByVal code As Func(Of TResult), _ByVal sql As String, _Optional ByVal parameters As SqlParameterCollection = Nothing) As TResult End Function
I am getting this compiler error : 'Func' is ambiguous in the namespace 'System'.
[Code]...
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Mar 11, 2009
I'm using VB6 and trying to get an instance of a Type Library object.After i retrieved the object and i'm trying to invoke a method. I'm getting this exception. However, i've checked with the parameters and its type. it is correct.I found something fishy, that method doesnt have return value. But it is throwing a compiler error whenever i'm trying to call the function and the compiler error went off when i get a return value from that method.I don't know,
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Apr 12, 2011
I am attempting to fix a vb.net (using Visual Studio 2005) and while I have extensive experience using VB6, my vb.net skills are pretty much as a beginner.I've added some code to this program which calls a stored procedure but it won't run becauseof an error when it compiles:
Error 1 'usp_select_media_to_removeNoGenres' is not a member of 'Lynd.Data.TestDatabase._StoredProceduresClass'
[code]....
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Jul 18, 2008
I do know invoking a methods labeled by ObsoletedAttribute should bring out a compiler errorBut how about the following codes? The caller aslo haved been obsoleted with true as the error parameter. How come it still produces the error?It's not a problem in C# codes.So how can I disable this annoyying error?
<Obsolete("This procedure has been obsoleted"
Public Sub Foo()
[code].....
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Feb 15, 2010
I keep getting this compilation error code 1 and when I click on swhow compiler detailed output, it shows the following:
[code]...
The aspnet user account has also vanished..
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Dec 7, 2011
I am running a web server using VB.net and I have a bunch of pages that need to utilize similar functionality, so I was thinking of creating a shared base class that incorporates all of this shared functionality. I created a file call it SharedBaseClass.vb, and I also have a class that should inherit from this class, SubClass.aspx.vb. The Top few lines of the the parent class look like this:
Partial Class SharedBaseClass
Inherits System.Web.UI.Page
And of the child class that should inherit:
Partial Class SubClass
Inherits SharedBaseClass
Then at the top of the SubClass.aspx file it looks like this:
<%@ Page Title="" Language="VB" MasterPageFile="~/Main_SA.master" AutoEventWireup="false" Src="SubClass.aspx.vb" Inherits="SubClass" %>
Assume that all of these files are located in the same directory.But when I try to run this, I get an error:Compiler Error Message: BC30002: Type 'SharedBaseClass' is not defined.And then the highlighted error is on the line that reads: Inherits SharedBaseClass I've also tried importing the file to no avail.
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Apr 11, 2011
[Code]....
This code is giving an error: Compiler Error Message: BC30201: Expression expected. I just basically want to check if two values are equal but its saying something about expression expected although i've given the expression to evaluate.
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