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Specifying property defaultsmaking. Normally this would be done as follows: Private _myprop As String = "My Default Value" <System.ComponentModel.DefaultValue("My Default Value")> Public Property MyProperty() As String Get Return Me._myprop End Get Set(ByVal value As String) Me._myprop = value End Set End Property However, in my situation I am not using a private variable to store the value. If I understand correctly, the Property -> Sets for any properties specified is the first thing to occur in the control. Is there a way to specify a default value without using the technique I show above? Thanks. you can do it in the constructor, or if thats too early, do it in the
get/set methods. bool myPropInited = false; string myProp { get { if (!myPropInited) { setDefaultValue(); myPropInited = true; } return myPropvalue; } set { myPropInited = true; ..... } } -- bruce (sqlwork.com) Nathan Sokalski wrote: Show quoteHide quote > I need to specify the default value for a property of a custom control I am > making. Normally this would be done as follows: > > Private _myprop As String = "My Default Value" > > <System.ComponentModel.DefaultValue("My Default Value")> Public Property > MyProperty() As String > Get > Return Me._myprop > End Get > Set(ByVal value As String) > Me._myprop = value > End Set > End Property > > > However, in my situation I am not using a private variable to store the > value. If I understand correctly, the Property -> Sets for any properties > specified is the first thing to occur in the control. Is there a way to > specify a default value without using the technique I show above? Thanks. Nathan
This is a verry good article to read for you http://www.dotnetarticles.net/Graphics-Programming/657.html Keep in mind that you still need a way to send a message to the IDE for your default property value to show ( 2 ways described in the article ) HTH Michel Show quoteHide quote "Nathan Sokalski" <njsokal***@hotmail.com> schreef in bericht news:%23bk4Y2xqJHA.1504@TK2MSFTNGP03.phx.gbl... >I need to specify the default value for a property of a custom control I am >making. Normally this would be done as follows: > > Private _myprop As String = "My Default Value" > > <System.ComponentModel.DefaultValue("My Default Value")> Public Property > MyProperty() As String > Get > Return Me._myprop > End Get > Set(ByVal value As String) > Me._myprop = value > End Set > End Property > > > However, in my situation I am not using a private variable to store the > value. If I understand correctly, the Property -> Sets for any properties > specified is the first thing to occur in the control. Is there a way to > specify a default value without using the technique I show above? Thanks. > -- > Nathan Sokalski > njsokal***@hotmail.com > http://www.nathansokalski.com/ > Note that the article is out of date "For cases where the properties return
some type other than a string, a number, or an enumeration,..". The default property can be set by using a string representation of the property value in conjunction with the type. Eg: DefaultValue(GetType(Font), "Microsoft Sans Serif, 8.25pt") DefaultValue(GetType(Color), "Orange") Show quoteHide quote "Michel Posseth [MCP]" <M***@posseth.com> wrote in message news:ua3YsVyqJHA.4996@TK2MSFTNGP04.phx.gbl... > Nathan > > This is a verry good article to read for you > > http://www.dotnetarticles.net/Graphics-Programming/657.html > > Keep in mind that you still need a way to send a message to the IDE for > your default property value to show ( 2 ways described in the article ) > > HTH > > Michel > > > "Nathan Sokalski" <njsokal***@hotmail.com> schreef in bericht > news:%23bk4Y2xqJHA.1504@TK2MSFTNGP03.phx.gbl... >>I need to specify the default value for a property of a custom control I >>am making. Normally this would be done as follows: >> >> Private _myprop As String = "My Default Value" >> >> <System.ComponentModel.DefaultValue("My Default Value")> Public Property >> MyProperty() As String >> Get >> Return Me._myprop >> End Get >> Set(ByVal value As String) >> Me._myprop = value >> End Set >> End Property >> >> >> However, in my situation I am not using a private variable to store the >> value. If I understand correctly, the Property -> Sets for any properties >> specified is the first thing to occur in the control. Is there a way to >> specify a default value without using the technique I show above? Thanks. >> -- >> Nathan Sokalski >> njsokal***@hotmail.com >> http://www.nathansokalski.com/ >> > > Maybe I am missing something in the article, but let me be more specific
about my situation. I am inheriting from the System.Web.UI.HtmlControls.HtmlAnchor class. I want to be able to set the inherited Target property to "_blank" or String.Empty based on a Boolean value specified by the user. Here is my current code: <System.ComponentModel.DefaultValue(True)> Public Property TargetBlank() As Boolean Get Return Me.Target.ToLower() = "_blank" End Get Set(ByVal value As Boolean) If value Then Me.Target = "_blank" Else Me.Target = String.Empty End Set End Property This will work if the user specifies a value, but because in order to have the default be Me.Target="_blank" the Set method must be run and I cannot run any code before the Property -> Set methods are run, I cannot find a way to set the default. Show quoteHide quote "Michel Posseth [MCP]" <M***@posseth.com> wrote in message news:ua3YsVyqJHA.4996@TK2MSFTNGP04.phx.gbl... > Nathan > > This is a verry good article to read for you > > http://www.dotnetarticles.net/Graphics-Programming/657.html > > Keep in mind that you still need a way to send a message to the IDE for > your default property value to show ( 2 ways described in the article ) > > HTH > > Michel > > > "Nathan Sokalski" <njsokal***@hotmail.com> schreef in bericht > news:%23bk4Y2xqJHA.1504@TK2MSFTNGP03.phx.gbl... >>I need to specify the default value for a property of a custom control I >>am making. Normally this would be done as follows: >> >> Private _myprop As String = "My Default Value" >> >> <System.ComponentModel.DefaultValue("My Default Value")> Public Property >> MyProperty() As String >> Get >> Return Me._myprop >> End Get >> Set(ByVal value As String) >> Me._myprop = value >> End Set >> End Property >> >> >> However, in my situation I am not using a private variable to store the >> value. If I understand correctly, the Property -> Sets for any properties >> specified is the first thing to occur in the control. Is there a way to >> specify a default value without using the technique I show above? Thanks. >> -- >> Nathan Sokalski >> njsokal***@hotmail.com >> http://www.nathansokalski.com/ >> > >
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On Mar 22, 6:39 pm, "Nathan Sokalski" <njsokal***@hotmail.com> wrote: Not sure if it will be acceptable or not, but you could do this by the> Maybe I am missing something in the article, but let me be more specific > about my situation. I am inheriting from the > System.Web.UI.HtmlControls.HtmlAnchor class. I want to be able to set the > inherited Target property to "_blank" or String.Empty based on a Boolean > value specified by the user. Here is my current code: > > <System.ComponentModel.DefaultValue(True)> Public Property TargetBlank() As > Boolean > Get > Return Me.Target.ToLower() = "_blank" > End Get > Set(ByVal value As Boolean) > If value Then Me.Target = "_blank" Else Me.Target = String.Empty > End Set > End Property > > This will work if the user specifies a value, but because in order to have > the default be Me.Target="_blank" the Set method must be run and I cannot > run any code before the Property -> Set methods are run, I cannot find a way > to set the default. > -- > Nathan Sokalski > njsokal...@hotmail.comhttp://www.nathansokalski.com/ > > "Michel Posseth [MCP]" <M***@posseth.com> wrote in messagenews:ua3YsVyqJHA.4***@TK2MSFTNGP04.phx.gbl... > > > > > Nathan > > > This is a verry good article to read for you > > >http://www.dotnetarticles.net/Graphics-Programming/657.html > > > Keep in mind that you still need a way to send a message to the IDE for > > your default property value to show ( 2 ways described in the article ) > > > HTH > > > Michel > > > "Nathan Sokalski" <njsokal***@hotmail.com> schreef in bericht > >news:%23bk4Y2xqJHA.1504@TK2MSFTNGP03.phx.gbl... > >>I need to specify the default value for a property of a custom control I > >>am making. Normally this would be done as follows: > > >> Private _myprop As String = "My Default Value" > > >> <System.ComponentModel.DefaultValue("My Default Value")> Public Property > >> MyProperty() As String > >> Get > >> Return Me._myprop > >> End Get > >> Set(ByVal value As String) > >> Me._myprop = value > >> End Set > >> End Property > > >> However, in my situation I am not using a private variable to store the > >> value. If I understand correctly, the Property -> Sets for any properties > >> specified is the first thing to occur in the control. Is there a way to > >> specify a default value without using the technique I show above? Thanks. user passing a parameter to the control's contructor. That would work with my current code, but my goal here is to set a default
value (in other words, specify what the value will be when the user does not pass a parameter). -- Show quoteHide quoteNathan Sokalski njsokal***@hotmail.com http://www.nathansokalski.com/ <joecool1***@live.com> wrote in message news:b183820f-8371-46ef-aae0-a2236ad85bd7@n30g2000vba.googlegroups.com... Not sure if it will be acceptable or not, but you could do this by theOn Mar 22, 6:39 pm, "Nathan Sokalski" <njsokal***@hotmail.com> wrote: > Maybe I am missing something in the article, but let me be more specific > about my situation. I am inheriting from the > System.Web.UI.HtmlControls.HtmlAnchor class. I want to be able to set the > inherited Target property to "_blank" or String.Empty based on a Boolean > value specified by the user. Here is my current code: > > <System.ComponentModel.DefaultValue(True)> Public Property TargetBlank() > As > Boolean > Get > Return Me.Target.ToLower() = "_blank" > End Get > Set(ByVal value As Boolean) > If value Then Me.Target = "_blank" Else Me.Target = String.Empty > End Set > End Property > > This will work if the user specifies a value, but because in order to have > the default be Me.Target="_blank" the Set method must be run and I cannot > run any code before the Property -> Set methods are run, I cannot find a > way > to set the default. > -- > Nathan Sokalski > njsokal...@hotmail.comhttp://www.nathansokalski.com/ > > "Michel Posseth [MCP]" <M***@posseth.com> wrote in > messagenews:ua3YsVyqJHA.4***@TK2MSFTNGP04.phx.gbl... > > > > > Nathan > > > This is a verry good article to read for you > > >http://www.dotnetarticles.net/Graphics-Programming/657.html > > > Keep in mind that you still need a way to send a message to the IDE for > > your default property value to show ( 2 ways described in the article ) > > > HTH > > > Michel > > > "Nathan Sokalski" <njsokal***@hotmail.com> schreef in bericht > >news:%23bk4Y2xqJHA.1504@TK2MSFTNGP03.phx.gbl... > >>I need to specify the default value for a property of a custom control I > >>am making. Normally this would be done as follows: > > >> Private _myprop As String = "My Default Value" > > >> <System.ComponentModel.DefaultValue("My Default Value")> Public > >> Property > >> MyProperty() As String > >> Get > >> Return Me._myprop > >> End Get > >> Set(ByVal value As String) > >> Me._myprop = value > >> End Set > >> End Property > > >> However, in my situation I am not using a private variable to store the > >> value. If I understand correctly, the Property -> Sets for any > >> properties > >> specified is the first thing to occur in the control. Is there a way to > >> specify a default value without using the technique I show above? > >> Thanks. user passing a parameter to the control's contructor. On Mar 22, 8:19 pm, "Nathan Sokalski" <njsokal***@hotmail.com> wrote: What you deescribe sounds exactly like setting the property to a> That would work with my current code, but my goal here is to set a default > value (in other words, specify what the value will be when the user does not > pass a parameter). constant value in the constructor. Show quoteHide quote > -- > Nathan Sokalski > njsokal...@hotmail.comhttp://www.nathansokalski.com/ > > <joecool1***@live.com> wrote in message > > news:b183820f-8371-46ef-aae0-a2236ad85bd7@n30g2000vba.googlegroups.com... > On Mar 22, 6:39 pm, "Nathan Sokalski" <njsokal***@hotmail.com> wrote: > > > > > > > Maybe I am missing something in the article, but let me be more specific > > about my situation. I am inheriting from the > > System.Web.UI.HtmlControls.HtmlAnchor class. I want to be able to set the > > inherited Target property to "_blank" or String.Empty based on a Boolean > > value specified by the user. Here is my current code: > > > <System.ComponentModel.DefaultValue(True)> Public Property TargetBlank() > > As > > Boolean > > Get > > Return Me.Target.ToLower() = "_blank" > > End Get > > Set(ByVal value As Boolean) > > If value Then Me.Target = "_blank" Else Me.Target = String.Empty > > End Set > > End Property > > > This will work if the user specifies a value, but because in order to have > > the default be Me.Target="_blank" the Set method must be run and I cannot > > run any code before the Property -> Set methods are run, I cannot find a > > way > > to set the default. > > -- > > Nathan Sokalski > > njsokal...@hotmail.comhttp://www.nathansokalski.com/ > > > "Michel Posseth [MCP]" <M***@posseth.com> wrote in > > messagenews:ua3YsVyqJHA.4***@TK2MSFTNGP04.phx.gbl... > > > > Nathan > > > > This is a verry good article to read for you > > > >http://www.dotnetarticles.net/Graphics-Programming/657.html > > > > Keep in mind that you still need a way to send a message to the IDE for > > > your default property value to show ( 2 ways described in the article ) > > > > HTH > > > > Michel > > > > "Nathan Sokalski" <njsokal***@hotmail.com> schreef in bericht > > >news:%23bk4Y2xqJHA.1504@TK2MSFTNGP03.phx.gbl... > > >>I need to specify the default value for a property of a custom control I > > >>am making. Normally this would be done as follows: > > > >> Private _myprop As String = "My Default Value" > > > >> <System.ComponentModel.DefaultValue("My Default Value")> Public > > >> Property > > >> MyProperty() As String > > >> Get > > >> Return Me._myprop > > >> End Get > > >> Set(ByVal value As String) > > >> Me._myprop = value > > >> End Set > > >> End Property > > > >> However, in my situation I am not using a private variable to store the > > >> value. If I understand correctly, the Property -> Sets for any > > >> properties > > >> specified is the first thing to occur in the control. Is there a way to > > >> specify a default value without using the technique I show above? > > >> Thanks. > > Not sure if it will be acceptable or not, but you could do this by the > user passing a parameter to the control's contructor. I currently do not have a constructor (since the only values that get set
during creation are the attributes specified in the control in the aspx file, I have never needed one when creating a custom control before). But I tried your idea and added Public Sub New() MyBase.New() Me.Target = "_blank" End Sub And it worked! Thank you, you are a life saver! -- Nathan Sokalski njsokal***@hotmail.com http://www.nathansokalski.com/ <joecool1***@live.com> wrote in message news:6b50e872-a77a-4cba-bc3a-019f8d05fb75@e5g2000vbe.googlegroups.com... What you deescribe sounds exactly like setting the property to aOn Mar 22, 8:19 pm, "Nathan Sokalski" <njsokal***@hotmail.com> wrote: > That would work with my current code, but my goal here is to set a default > value (in other words, specify what the value will be when the user does > not > pass a parameter). constant value in the constructor. Show quoteHide quote > -- > Nathan Sokalski > njsokal...@hotmail.comhttp://www.nathansokalski.com/ > > <joecool1***@live.com> wrote in message > > news:b183820f-8371-46ef-aae0-a2236ad85bd7@n30g2000vba.googlegroups.com... > On Mar 22, 6:39 pm, "Nathan Sokalski" <njsokal***@hotmail.com> wrote: > > > > > > > Maybe I am missing something in the article, but let me be more specific > > about my situation. I am inheriting from the > > System.Web.UI.HtmlControls.HtmlAnchor class. I want to be able to set > > the > > inherited Target property to "_blank" or String.Empty based on a Boolean > > value specified by the user. Here is my current code: > > > <System.ComponentModel.DefaultValue(True)> Public Property TargetBlank() > > As > > Boolean > > Get > > Return Me.Target.ToLower() = "_blank" > > End Get > > Set(ByVal value As Boolean) > > If value Then Me.Target = "_blank" Else Me.Target = String.Empty > > End Set > > End Property > > > This will work if the user specifies a value, but because in order to > > have > > the default be Me.Target="_blank" the Set method must be run and I > > cannot > > run any code before the Property -> Set methods are run, I cannot find a > > way > > to set the default. > > -- > > Nathan Sokalski > > njsokal...@hotmail.comhttp://www.nathansokalski.com/ > > > "Michel Posseth [MCP]" <M***@posseth.com> wrote in > > messagenews:ua3YsVyqJHA.4***@TK2MSFTNGP04.phx.gbl... > > > > Nathan > > > > This is a verry good article to read for you > > > >http://www.dotnetarticles.net/Graphics-Programming/657.html > > > > Keep in mind that you still need a way to send a message to the IDE > > > for > > > your default property value to show ( 2 ways described in the > > > article ) > > > > HTH > > > > Michel > > > > "Nathan Sokalski" <njsokal***@hotmail.com> schreef in bericht > > >news:%23bk4Y2xqJHA.1504@TK2MSFTNGP03.phx.gbl... > > >>I need to specify the default value for a property of a custom control > > >>I > > >>am making. Normally this would be done as follows: > > > >> Private _myprop As String = "My Default Value" > > > >> <System.ComponentModel.DefaultValue("My Default Value")> Public > > >> Property > > >> MyProperty() As String > > >> Get > > >> Return Me._myprop > > >> End Get > > >> Set(ByVal value As String) > > >> Me._myprop = value > > >> End Set > > >> End Property > > > >> However, in my situation I am not using a private variable to store > > >> the > > >> value. If I understand correctly, the Property -> Sets for any > > >> properties > > >> specified is the first thing to occur in the control. Is there a way > > >> to > > >> specify a default value without using the technique I show above? > > >> Thanks. > > Not sure if it will be acceptable or not, but you could do this by the > user passing a parameter to the control's contructor.
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"Nathan Sokalski" <njsokal***@hotmail.com> schrieb As this seems to be redundant information, why is "Target" not just a > <System.ComponentModel.DefaultValue(True)> Public Property TargetBlank() > As Boolean > Get > Return Me.Target.ToLower() = "_blank" > End Get > Set(ByVal value As Boolean) > If value Then Me.Target = "_blank" Else Me.Target = String.Empty > End Set > End Property > > > This will work if the user specifies a value, but because in order to have > the default be Me.Target="_blank" the Set method must be run and I cannot > run any code before the Property -> Set methods are run, I cannot find a > way to set the default. Readonly property that returns the one ("_blank") or the other (string.empty) value depending on the value of the TargetBlank property? Armin  
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