Declarative - Enforce Type Alias In .NET?
Apr 6, 2012
How might one go about aliasing a type in VB.NET or C# such that when the alias is used as an argument type in a function, accidentally using the not aliased type is an error?
i.e.
Imports AccessSpecifier = System.String
Module Accessors
Delegate Function IoOper(ByRef strm As System.IO.Stream) As Action
[code]....
Overall, I'm wanting the IDE to force me to know what I'm doing if I'm throwing Ints around to mean Flags, or States and Strings around to mean Names, Propertys and Records.
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Sep 30, 2009
I am trying to figure out how to declaratively pass in a event handler into a user control, but I am stumped. All I can make work is the user control's event handler.. I can't seem to bubble up the caught event into the parent page. Ideas would be quite welcome. Here is my code:Default.aspx:
<%@ Page Language="VB" %>
<%@ Register TagPrefix="rpt" TagName="filter" Src="WebUserControl.ascx" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
[Code]...
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Jul 27, 2011
I am using a textbox in vb.net but the input should be an hour format for example, "13h30". How can I enfprce this by a user? When he puts the first 2 digits like 13 then automaticly the appl. puts a "h" between?
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Dec 14, 2009
Is there a way to enforce case sensitivity in VB.Net file-names?
The primary issue that I am trying to solve is the difference in how Windows doesn't care about the case of a file-name, but other tools, like Subversion, do care about the case of a file-name
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Dec 15, 2011
I want to enforce validation rule in create table statement for a coloumn. im using vb.net as front end and access as back end.
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Aug 21, 2011
I am using a sql server database and i am storing the time value in the datetime variable. I am developing a booking system application in vb.net. When I want to view already made bookings using datagridview and by implementing dataadapter and dataset...When the table is shown in the datagridview I want custom column names to be shown so tell me that how can i use alias in the query given in datadapter initialization part?
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Apr 3, 2012
I have an enum in one module that's used in another that has a long name:
Public Enum Enumwithaverylongname
foo
bar
end Enum
When I use it, I'd like to alias it to a shorter name like:
f.foo
instead of
Enumwithaverylongname.foo
Can I do that?
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Jan 27, 2012
Here's my SQL query:
SELECT EmployeeID, EmployeeLastName + ', ' + EmployeeFirstName AS Name
FROM employees
ORDER BY Name
How can I go about doing the something in LINQ to SQL?
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Aug 25, 2010
I have an object and I iterate over object's properties. Foreach property, i append it as a column to a listview.
In my object, some properties doesn't have accents. But in portuguese, they do. For example: "Endereco" property must be "Endereo".
I need an away to create an alias to the properties.
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Nov 13, 2011
I'm writing custom code in VS2005 Reports (SSRS / Report Builder). The code is working fine, but I have to make absolute references to assembly classes. For instance:For Each m As System.Text.RegularExpressions.Match In ...Is there any way to alias the reference to System.Text.RegularExpressions.Match, so that I can reuse it in a concise manner? I know in PHP, you'd do it like this:
use MyNamespace\MySubNamespace\MyClassVerboseName as MyClass
[...]
MyClass->MyMethod();
[code]......
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Aug 2, 2011
doesn't really matter? low priority.
[Code]...
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Apr 21, 2010
I am assigning the class object to grid's data source. And grid displaying all the properties of class with values. But i do not want to display the original name of properties of class. Is there any way to provide set alias name to property to display in grid?
I know that it can be possible by setting the grid's column caption. But i want to do it at class level or by other way instead of processing on Grid. Is there any attribute that set alias name to property?
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Feb 24, 2009
I have some VB6 code that I am converting to VB.net and came across this section
Declare Function TmSendByLen Lib "tmctl.dll" Alias "TmSendByLength"(ByVal id As Integer, ByRef msg As Any, ByVal blen As Integer) As Integer
'snip'
[code]....
I have not come across the Alias term before but I can guess what it does. What I am unsure of is the reasoning behind overloading the alias. If that is what is happening.I need to create overloads for the TmSendByLen function as the 'As Any' is not supported in VB.net so I am not sure if I should just remove the alias or if I should leave it in place.
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Feb 26, 2011
Using .NET (VB or C#), how can I add an e-mail alias to a user in Active Directory? I have written code to change the format of our usernames from "first_last" to "first.last.country" and I need to update the e-mail addresses as well. Our solution is to add an alias e-mail to the users in exchange, but I don't know how I can do this using .NET.
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Aug 16, 2011
In Reporting Service, I need to have a vertical, starting at bottom, bottom-to-top, horizontally middle aligned text.The only way to do this is to create an image in code, and set this image into the title column.See the code below.Basically, it works fine, just that the anti-alias quality is pretty crappy.Is there anything I can do to improve it ?The vertical text is somehow pale, and not full black, and also there is smearing all around the text, in the background color.As well as it appears bolder than the text on the left, but both have format arial, size 8, bold I've tried all other values of System.Drawing.Text.TextRenderingHint.*, as well as no anti-alias at all but the current one seems to be the least crappy.I've also tried to change the image format, to no avail:
Function LoadImage2(ByVal sImageText As String, ByVal sImageTextMax As String) As System.Drawing.Image
sImageTextMax = sImageTextMax.PadRight(15)
Dim iFontSize As Integer = 8 '//Change this as needed
[code]....
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May 17, 2010
I'm trying to get the Alias of the logged in user (Active Directory/LDAP environment/Exchange) .
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Aug 13, 2009
I am using a databound datagridview control. I created a custom query to fill the grid with which includes joins and using alias names in the sql query for the joined fields. Here is the query I am using:
SELECT Events.[Date], Events.[Time], Contacts.LastName AS Lastname, Contacts.FirstName AS Firstname
FROM (Events INNER JOIN
Contacts ON Events.ContactID = Contacts.ContactID)
The datagrid views fine using the columns that are in the events table. I want to be able to view the aliased columns from the contacts table in the datagridview as well.
How can I display the joined columns in the datagridview? Maybe there is a better way to do this? Maybe this is not enough information for a resolution.
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Jul 22, 2010
I'm using Redumption to send a mail using VB.NET, I've stored a file with an unique name exg.c:docs123.pdf which I'm supposed to attach to the mail with a different name "Appliaction.pdf".
[Code]...
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Jan 9, 2012
I am using a query in vb.net, database is Access. I need alias of query like sql but the query return me column alias and also ' '
SELECT COLUMN1 AS 'FIRST NAME'
I expect the result to be a field called FIRST NAME but it returns the string "FIRST NAME". Is there is any way if return me the field FIRST NAME instead of "FIRST NAME".
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Feb 1, 2011
im trying to join two tables together, (this messaging system) and im having trouble with the query.
Select Message_ID, Firstname, Surname , Subject , Message FROM messages, guardian_users INNER JOIN messages ON guardian_users.User_ID = messages.Sender_ID WHERE messages.receiver_ID = 3
and im getting this error: #1066 - Not unique table/alias: 'Messages' (joining tables Messages and guardian_users)
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May 12, 2011
I know you can alias an Imports statement in
Imports xyz = ProjectABC.ClassABC
But if I want to use the Project Properties, Reference tab to select a namespace to allow a project-wide setting, is it possible to alias that namespace?
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Oct 13, 2011
I basically have an abstract class that deals heavily with Generics. I need to call a Shared method on the Generic class T. I need to make sure the Shared method is implemented. I could use reflection to check for the implementation and call the method if it exists or throw an exception otherwise. However, since the derived class is not "aware" that it needs to implement this method, I feel that the exception will get thrown more often than not
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Nov 24, 2008
Is there an equivalent of "extern alias" (C#) in VB.NET ?
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Oct 13, 2010
I've come from a Assembler and C/C++ background, so I understand the concept behind reference types versus value types in vb.net. Also, I've read Jon Skeet's article regarding references and value types and I understand all of that. My question is: How can you tell if a given type is a reference type or a value type? Is it simply that all integral types (ints, floats, etc.) are value types and all classes are reference types? (If so, where do strings fall?)
[Code]...
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Jan 28, 2012
when view in browser, i got this error: Unable to cast object of type 'ASP.webform1_aspx' to type 'System.Web.UI.WebControls.Button'.
how should i solve this problem?
Line 7: If Not Page.IsPostBack Then
Line 8: Dim rowIndex As Integer = 0
<b>Line 9: Dim btn As Button = DirectCast(sender, Button)</b>
[Code].....
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Mar 22, 2010
I'm trying to add a new record to my database but i keep getting the message - "conversion from type DBnull to type string is not valid". I think its something to do with the Employee ID when VB attempts to save it to the database my code is below
Imports System.Data.OleDb
Public Class Add
Private Sub DisplayRow()
[Code]....
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May 25, 2011
I now have SQL Parameters set up and I'm using them to save/delete/add my data. This all works well, except when it's trying to save a combobox to the datatable it appears with the error above.Majority of my comboboxes have datasources, and the valuemembers of these are the actual list items, not the ID's of the list items.I'm not sure why this error could be happening, I'm fairly sure I've connected everything to the binding source correctly; I've checked it a few times.Does anybody know what the cause of this could be? I've looked around a bit and I haven't found much
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Mar 1, 2012
I've spent quite a bit of time reading up on generics, covariance, etc., and I am failing to understand why I get the aforementioned compiler error in this type of codeLet's say I have a base "Bill" class made up of a collection of Lines..
Public Class Bill(Of L As Line)
Private _lines As List(Of L)
Public Property Lines() As List(Of L)
[code].....
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Dec 22, 2009
E.g. how do I get VB.Net to statically type a local variable to be the static type of the expression on the right had side of the assignment?
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Apr 19, 2010
I had write code (just for learning), the codes :
dim Temp as string
Temp = Recordset("
Table_Field")
but, when I start Debugging the error messages "Unable to cast object of type 'ADODB.InternalField' to type 'System.String"
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