Reference A UserControl Class Based Off String Value?
Jan 24, 2011I currently have the following [code]...
How can I modify it so that "UserControl_appName" is not hard coded. I would like to pass it as a string.
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Asp.net - Reference TextBox In One UserControl From Another UserControl
Jan 19, 2011I have two UserControls on a MasterPage. DataEntryUC contains several TextBoxes and DropDownList. NavSaveUC contains navigation buttons. When the user clicks on a navigation button, I will be saving the data entered into DataEntryUC from the NavSaveUC UserControl.
I have a couple of tables in my DB that contain stored procedure names, control names, control types, SqlDbTypes, etc.... that correlate with DataEntryUC.
How do I reference a text box that is on DataEntryUC from NavSaveUC?
I have been working on the following code from NavSaveUC with no luck.
Dim MyControlName = "txtFirstName"
Dim MyControlType = "TextBox"
Dim MyStringValue as String
[Code]....
Obtaining Reference To Class Instance By String Name?
Mar 12, 2010Is it possible using Reflection or some other method to obtain a reference to a specific class instance from the name of that class instance? For example the framework for the applications I develop heavily uses public class instances such as:
Public bMyreference as MyReference = new MyReference
Then throughout the application bMyReference is used by custom controls and code. One of the properties of the custom controls is the "FieldName" which references a Property in these class instances (bMyReference.MyField) as a string. What I would like to be able to do is analyze this string "bMyReference.MyField" and then refer back to the actual Instance/Property.
In VB6 I would use an EVAL or something simular to convert the string to an actual object but this obviously doesn't work in VB.net. What I'm picturing is something like this:
Dim FieldName as String = MyControl.FieldName ' sets FielName to bMyReference.MyField
Dim FieldObject() as String = FieldName.Split(".") ' Split into the Object / Property
Dim myInstance as Object = ......... ' Obtain a reference to the Instance and set as myInstance
Dim myProperty = myInstance.GetType().GetProperty(FieldObject(1))
C# - Create A Reference Of String Class Without Making A Object Of It And Start Using It?
Sep 6, 2010String s = "test"; String is a class, so to use it we should create an object of it. But rather we just make a reference of it and give it a value. How is it possible and what concepts are used in it. The metadata of String class shows the following :
[Code]...
Reference The Values From Textboxes On Form Submit That Reside In Usercontrol?
Aug 18, 2011I have a large form that reuses several elements, so I decided to create a usercontrol with some common fields. The problem is when the form is filled out by a user and submitted, how do I reference those values so I can input them to my database???
Example:
Using Conn As New SqlConnection(connect)
Using Cmd As New SqlCommand(SQL, Conn)
Cmd.Parameters.AddWithValue("@Acct_Company", txtPartner.Text)
Cmd.Parameters.AddWithValue("@Acct_AccountNum", txtPartnerAccount.Text)
So, above two Cmd lines are for normally inserted textboxes in my form, but what would the line look like to reference any usercontrol form fields?
Added To Each UserControl (different Instances Of The Same Class), A Little Map?
Apr 28, 2009I have a form whose purpose is to let the user to load map files.The form may manage a variable classes of maps, and each class have his own UserControl.To make it more user friendly, I added to each UserControl (different instances of the same class), a little map, showing a small picture of the map, and some data, as bound coordinates.
The problem is, that it looks really ugly. The maps are so big, compared with the rest of the UserControl (who contains just a button and a textbox to search for files).I wish to fix it, but I din not see an elegant way to include the pictures and info.I attach a form screen capture with two UserControl.I would like to get some tips for more experienced users. There are some guidelines?
Exposing A Supporting Class From A Usercontrol
Apr 8, 2010I have a supporting GridColumn Class that resides in the same class library project as my GridBox usercontrol.It is used in a list of GridColumns as a property.[code]In the Load event of my form I would like to use the .Add method of the List(Of GridColumn) to add columns to the usercontrol.[code]It will not work though because it cannot find the GridColumn class.If I use: "Imports <My Class Library Name>" it works, but I would like it to work without having to do so.Standard controls do this all the time.Am I putting the supporting class in the wrong place?Is there a modifier I that will expose the class when the usercontrol is dropped on a form?As a work around I created a method that adds a column but I would like to know in any case.
View 9 RepliesHow To Assign A Different Reference To A Class Instance From Inside The Class Code
Jan 18, 2011my proble is the following: I have a class MyClass and another class Modifier, which has a method ModifyMyClass(ByRef mc as MyClass) that receives a MyClass instance as ByRef parameter to modify it. A smell of the code is:
[Code]...
VS 2008 Reference Parent Class From Inside Child Class?
Apr 11, 2009I have a 'property management class' that contains several functions and properties. I have several other classes that use the 'management class' as a property to derive the value of several of its other properties.Is there a way for me to reference the outer class from the 'management class' functions without having to pass it as a parameter? I ask because several different classes can have this 'management class' as a property and am having a hard time typing the parameter.
View 7 RepliesClass With Class Properties: AObject Reference Not Set To An Instance?
Aug 19, 2009I have a class in which some of the fields are also classes.I can put values in the "normal" properties, but in the others when o try to assign values it gives the: "Object reference not set to an instance of an object"But the code compiles fine.
dados_Defenicao = New ServiceReference1.draftClaimEntryDefinition
dados_Defenicao.arCode = "123"
dados_Defenicao.claimMarket.warrantyType = "w" - Here it gives the error
How can i fix this ?
Class With Class Properties: Object Reference Not Set To An Instance
Aug 19, 2009I have a class in which some of the fields are also classes.
I can put values in the "normal" properties, but in the others when o try to assign values it gives the: "Object reference not set to an instance of an object"
But the code compiles fine.
dados_Defenicao = New ServiceReference1.draftClaimEntryDefinition
dados_Defenicao.arCode = "123"
dados_Defenicao.claimMarket.warrantyType = "w" - Here it gives the error
Get Base Class Object Reference Outside The Class's Definition?
Dec 10, 2010If we are within the derived class then ofcource we can use MyBase keyword to access base class's object reference . That's fine , how can we take that base class's object reference outside that derived class's definition.My following code will explain what i want . Actually that is giving error right now, but it is explaining my requirement .
Public Class Base
Public x As String
End Class
[code]....
Actually there is error in ReadOnly Property BaseReference's Getter . Error is "Error 1 'MyBase' must be followed by '.' and an identifier. " how can i get base class object reference in Main method ?
Reference A Parent Class Object From A Child Class?
Jan 2, 2010I have a Parent Class Called Fuselage that containsfour child classes called Forebody, CenterBody, AftBody, and CrossSection. CrossSection classcontains objects common to Forebody, CenterBody, and Aftbody (example: width). How do I access thewidth property in CrossSection from within the classForebody?
Public Class Fuselage
Dim Forebody As ClsSection
Dim Centerbody As ClsSection
[code].....
Use CType To Change An Object Variable "obj" To Custom Class That Reference Using A String Variable Like Obj.GetType.Name?
Feb 9, 2011The code below works for the class that I hard coded "XCCustomers" in my RetrieveIDandName method where I use CType. However, I would like to be able to pass in various classes and property names to get the integer and string LIST returned. For example, in my code below, I would like to also pass in "XCEmployees" to my RetrieveIDandName method. I feel so close... I was hoping someone knew how to use CType where I can pass in the class name as a string variable.
Note, all the other examples I have seen and tried fail because we are using Option Strict On which disallows late binding. That is why I need to use CType.I also studied the "Activator.CreateInstance" code examples to try to get the class reference instance by string name but I was unable to get CType to work with that.When I use obj.GetType.Name or obj.GetType.FullName in place of the "XCCustomers" in CType(obj, XCCustomers)(i)I get the error "Type 'obj.GetType.Name' is not defined" or "Type 'obj.GetType.FullName' is not defined"
'+++++++++++++++++++++++++++++++
Imports DataLaasXC.Business
Imports DataLaasXC.Utilities
[code]....
VS 2005 Using A Common Base Class For Form And Usercontrol
Aug 10, 2009I happen to have these common procedures which I want to be used in my forms and usercontrols, with the form I can put those procedures in the base form which is being inherited but I happen to have a need to use those same procedures in my usercontrols, is there a way that I can have a common base class that I can use both for my form and usercontrol? I haven't used yet a base usercontrol since my usercontrols will not look the same so I have to put those procedures in each one of them and I find it rather cumbersome.
View 8 RepliesGet A Reference To The Class That Creates An Instance Of Another Class?
May 20, 2010I need to create a new instance of a class that needs a member of the calling class. But i can't pass a reference to the calling class through the constructor.The solution i am looking for is something like this:
Public Class ChildClass
Public Sub New(args)
_MyMember = GetMemberFromCallingClass()
[code]....
I want this to work without having to manually pass any references or variables from the calling class to the new instance of ChildClass.
IDE :: Design A ContextMenuStrip In A Designer Without A Relation To A Specific Form Or UserControl Class?
Oct 16, 2011in VS 2008, is there a way to design a ContextMenuStrip in a designer without a relation to a specific Form or UserControl class? For example,if you need the same ContextMenuStrip in Form1, Form2 and Form3, in which of them am I to design the ContextMenuStrip? Do I have to add a "pseudo-Form" to the project that contains my shared ContextMenuStrips and create only one instance of that Form, or is there another way? I consider this a programmatic hack, that's why my question is whether the IDE offers something better.
View 10 RepliesASP.NET Creating Dynamic Order Reference Based On Database Id?
Aug 5, 2011I am looking to create an order reference which is something like this
PLC0000001
Where the 1 would be my order id
but lets say it gets to 100 would like
PLC0000100
In VB.NET how could I build up a string like where i know i.e.
the starting part = PLC
Ending part = Order ID
middle = fill in 0's
.net - Write A .NETCF Partial Class To Extend System.Windows.Forms.UserControl?
May 28, 2010I'm writing a .NET CF (VBNET 2008 3.5 SP1) application, which has one master form, and it dynamically loads specific UserControls based on menu click, in a sort of framework idea. There are certain methods and properties these controls all need to work within the app. Right now I am doing this as an Interface, but this is aggravating as all get up, because some of the methods are optional, and yet I MUST implement them by the nature of interfaces.
[Code]...
Error - Base Class 'System.Windows.Forms.Panel' Specified For Class 'MenuButton' Cannot Be Different From The Base Class 'System.Windows.Forms.UserControl'
Mar 12, 2010When I do this
Public Class cInherits : Inherits Panel
I get this: Base class 'System.Windows.Forms.Panel' specified for class 'MenuButton' cannot be different from the base class 'System.Windows.Forms.UserControl' of one of its other partial types.
How do I inherit?
Recognise Usercontrol From String
Apr 14, 2010I'm trying to reference a usercontrol that exists on the page by using a string which contains its name.[code]but all that happens is "myLabel" gets set to nothing.[code]
View 3 RepliesVS 2010 : UserControl MouseEnter/Leave Events Aren't Firing - Cannot Raise Base Event From Derived Class
Feb 18, 2011When i use my UserControl in a project my Mouse Enter & Leave events aren't firing, i assume i fix this with a raiseevents in my usercontrol. However when i try to do this it says something about "cannot raise base event from derived class".
View 7 RepliesReference To The String In The Heap Is Passed Even When You Pass The String ByVal To A Method?
Mar 2, 2011So strings are reference types right? My understanding is a reference to the string in the heap is passed even when you pass the string ByVal to a method.
String myTestValue = "NotModified";
TestMethod(myTestValue);
System.Diagnostics.Debug.Write(myTestValue); /* myTestValue = "NotModified" WTF? *[code].....
And what is going on under the hood? I would have bet my life that the value would have changed....
C# :: Call Function From UserControl On ASPX From UserControl On MasterPage?
Jan 31, 2011I have MainLayout.master that has UC_Menu.ascx on it. I have a page named Customer.aspx that uses MainLayout.master. Customer.aspx also contains a UserControl named UC_Details.ascx.How can I have UC_Menu.ascx call a function that is in UC_Details.ascx with this scenario?
View 3 RepliesCast A Reference To An Object To A Reference To An Object Of The Same Class?
Mar 17, 2012The book "Beginning ASP .NET 4 in VB 2010" contains the following:NOTE: TaxableProduct inherits from Product.You can also cast in the reverse directionfor example, cast a Productreference to a TaxableProduct reference. The trick here is that this
View 2 RepliesGet A String Key Based The Conent Of String Dimension?
Jul 9, 2009I hope get a string key based the content of string[] such as aDIM, I use the following do that, but I think it's not good way, could you give me a better way?
[Code]...
Create A Class Based On Text Box?
Jul 4, 2009it is possible to create a class based on text box, add some code to its events, say gotfocus event, and visually add this textbox to a form instead of adding it in code. Just like we drag and drop a textbox to a form from toolbox.
View 5 RepliesUserControl Access To Public Properties In Another UserControl?
Jun 12, 2011I have a Windows Form frmMain() holding seven more-or-less unrelated UserControls, ucFlopsy", "ucMopsy", "ucCottontail", etc...I say "more-or-less" because each of the seven UC has three similar public read/write properties:
IsLocked (a boolean indicating if the following two properties are "Locked")
IsLockedID (if IsLocked=True then IsLockedID is an integer)
IsLockedName (if IsLocked=True then IsLockedName is a string)
[code].....
Add A Class As A Reference In Another Project?
Sep 15, 2009how can I add a class of a different project to my current project as a reference?I tried Right click_-> add existing item --> ( The class from the other project) then it gives me error.I am not sure how can I use that class as my reference to my current project?
View 3 RepliesInvoking A Class Without Having A Reference?
Mar 17, 2009I'm converting a VB6 app to vb.net.The code creates objects using the CallbyName function with the classes name & and method being read from a database.I want to rewrite the classes in vb.net and have the same behaviour as I read in the name of an object from the database, instantiate it, and call one of it's methods.I don't know ahead of time what the names of the classes will be, so I can't make a reference to them in my project.
View 1 Replies
