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Thread: problem with the New sub in my custom control

  1. #1

    Thread Starter
    Frenzied Member maged's Avatar
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    problem with the New sub in my custom control

    Dear all,

    i am building a small control that inherits from the textbox, i am doing this so that i can preset some properties of the textbox so that when i drag them into my form in design view i dont need to adjust each one properties.


    the problem is with the text property.

    here is my code for the control


    VB Code:
    1. Public Class mytxtbox
    2.     Inherits System.Windows.Forms.TextBox
    3.     Sub New()
    4.         MyBase.New()
    5.         Me.MaxLength = 10
    6.         Me.Text = 0
    7.         Me.RightToLeft = Windows.Forms.RightToLeft.Yes
    8.  
    9.     End Sub


    now when i drag the new control from the toolbox to my form it is pulled down with all the properties setup as i want Except for the text propert
    it is always mytxtbox1 instead of 0 as i preset it in the new sub


    Waiting ur answer

    RGDS

  2. #2
    Hyperactive Member Lil Ms Squirrel's Avatar
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    Re: problem with the New sub in my custom control

    You need to set all of the properties using the MyBase keyword so instead of Me.Text, use MyBase.Text.
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  3. #3

    Thread Starter
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    Re: problem with the New sub in my custom control

    i tried it

    doesn't work

    any other suggestions


    |THx in advance

  4. #4
    Noodly Appendage wossname's Avatar
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    Re: problem with the New sub in my custom control

    Try making it a Public Sub New.
    I don't live here any more.

  5. #5
    Noodly Appendage wossname's Avatar
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    Re: problem with the New sub in my custom control

    Quote Originally Posted by Lil Ms Squirrel
    You need to set all of the properties using the MyBase keyword so instead of Me.Text, use MyBase.Text.

    That would only happen if you had local variables of the same name and you specifically didn't want to change them.
    I don't live here any more.

  6. #6

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    Re: problem with the New sub in my custom control

    i tried the public new with no difference

    the very strange thing that is all other properties are set as i need but only the text property don't ?????


    i can ignore it and change it from design form but i need to understand to learn better


    thx for your replies

  7. #7
    Super Moderator RobDog888's Avatar
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    Re: problem with the New sub in my custom control

    The Name property comes from the UC Class name - mytxtbox + 1 or whatever instances you have created.

    If you want the Text property to be defaulted to something then did you create a Public Property of Text?
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  8. #8
    Super Moderator RobDog888's Avatar
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    Re: problem with the New sub in my custom control

    Here is a sample of the Text property for a UC control.
    VB Code:
    1. Private _Text As String = ""
    2.  
    3.     <Browsable(True), DefaultValue("0"), Category("Appearance")> _
    4.     Public Shadows Property Text() As String
    5.         Get
    6.             Return _Text
    7.         End Get
    8.         Set(ByVal Value As String)
    9.             _Text = Value
    10.         End Set
    11.     End Property
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  9. #9

    Thread Starter
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    Re: problem with the New sub in my custom control

    first of all thank you for your reply RobDog888

    i need to understand what is the Shadow means ??? and why is it necessary to have this line

    VB Code:
    1. <Browsable(True), DefaultValue("0"), Category("Appearance")>

    i know what is overloading and overriding but it is the first time to get in touch with Shadows thing ??

    can you explain more


    thx again for your kind answers

    RGDS

  10. #10
    Super Moderator RobDog888's Avatar
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    Re: problem with the New sub in my custom control

    Ok, to start the line is an attribute tag that you get when you declare "Imports System.ComponentModel"
    at the very top of your class.

    "<Browsable(True)," means that in the property grid window you can "browse" the property
    or is "visible" so to speak.
    If you change it to False then it will be hidden from the property grid.

    "DefaultValue("0")," means that "0" will be the default property value for the property. If you change a
    property from its default value the value will become bold in the property grid. Also, when you right
    click on the property in the grid you get a popup menu that has two menuitems on it - "Reset"
    and "Description". Reset will change the property value back to your specified default value of "0". The Description
    menuitem will turn the HelpText panel on or off.

    "Description("The TabPages in the control." Description is the "description" that displays in the help text window below
    the prop grid like shown in the TabPages description.



    "Category("Appearance")>" means where you are placing the property categorically. If you look at
    your property grid window you will see:
    • Accessibility
    • Appearance
    • Behavior
    • Configurations
    • Data
    • Design
    • Focus
    • Layout
    • Misc

    So when its all put together you have several options plus more that I didnt get into.

    VB Code:
    1. <Browsable(True), DefaultValue("0"), Category("Appearance"), Description("MyTextBox Control is great!")> _
    2. Public Shadows Property Text() As String
    3.     Get
    4.         Return _Text
    5.     End Get
    6.     Set(ByVal Value As String)
    7.         _Text = Value
    8.     End Set
    9. End Property
    Note: there is a line wrap underscrore designator so it can attach to the Public Property blah bah...

    Now the "Shadows" part of it is required because the "Text" property is a built-in windows default
    property. We need to attach to the windows text property so we can modify it instead of having errors
    or duplicate Text properties.


    There is allot to cover for user controls. I just learned all this a few weeks ago and I now see the real
    depth with user controls and its not fun. , but the result is
    Attached Images Attached Images   
    Last edited by RobDog888; Mar 8th, 2005 at 10:36 PM.
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  11. #11

    Thread Starter
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    Re: problem with the New sub in my custom control



    thx a million RobDog888 , that is really nice of you

    understood


    Again thx, and you can count that i will vote for your sake in this thread

    C u soon i hope

    BST RGDS

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