c# - Binding Button IsEnabled depending of the ComboBox selection -


I'm sure it's really easy, but I do not know how it happens I have a combo box and a button , And I need to enable the button only if an item is selected in the combo box, i.e. the combo box shows no element, then the button should be disabled. How can I do this?

I have tried to do the following: 

  IsEnabled = "{binding element name = mycombobox, path = selected index}" />   
 But this does not work, I'm using Silverlight 5.  
 Thank you in advance   
 
 
 Something in MSDN may have helped you for It suggests that you use a converter or data trigger. I have not tested it, but maybe it will work?  
  & lt; window. Resources & gt; & Lt; Style x: Key = "MyButtonStyle" TargetType = "{x: type button}" & gt; & Lt; Setter Property = "Iceded" value = "true" /> & Lt; Style.Triggers & gt; & Lt; DataTrigger binding = "{binding path = selected item, element = combobox1}" value = "{x: faucet}" & gt; & Lt; Setter property = "UIElement.IsEnabled" value = "wrong" /> & Lt; / DataTrigger & gt; & Lt; /Style.Triggers> & Lt; / Style & gt; & Lt; /Window.Resources> & Lt; Grid & gt; & Lt; Combo box name = "combo box 1" & gt; & Lt; ComboBoxItem & gt; A & lt; / ComboBoxItem & gt; & Lt; ComboBoxItem & gt; Two & lt; / ComboBoxItem & gt; & Lt; ComboBoxItem & gt; Three & lt; / ComboBoxItem & gt; & Lt; / ComboBox & gt; & Lt; Button style = "{StaticResource MyButtonStyle}" name = "myButton" content = "push me" /> & Lt; / Grid & gt;   
  edit   
 I think Cyndy has already figured out all this, but for any future readers. ..  
 As mentioned in the comments, you can not trigger the data in Silverlight. You have to do a converter. There is another post that can help in a nutshell, you have to set your XML to something like this:  
  & lt; Button content = "mibuton" isEnabled = "{binding selected itam, elementname = combobox1, converter = {static resource mointer}}" />   
 And then in your code-back, you'll need something:  
  public class MyConverter: IValueConverter {public object convert (object value, type target Type, object parameter, cultureinfo culture) {return! (Value == empty); } Public Object Convertback (Object Value, Type Type, Object Parameter, CultureInfo Culture) {New Non Imulated Expression (); }}

Comments

Post a Comment

Popular posts from this blog

Verilog Error: output or inout port "Q" must be connected to a structural net expression -

I get the error every time, I try to compile. I'm not sure why anyone can help is? I'm new to verilog. Module D_FF (clerk, d, reset_n, q); Input D, Clack, reset_en; Output Q; reg Q; lab4_gdl f1 (.lk (~ clk), d (d), .q.m (qm)); lab4_GDL f2 (.Clk (Clk), D (QM), .Q (Q)); Always start at @ (posedge clk, neggeous reset_n) (Reset_n == 0) Q & lt; = 0; Other questions & lt; = D; Edit End: The problem is what we are asking to do: In this section, you apply the memory / registration circuit on the AlterEdie 2 board. will do. The circuit has the following specifications: The present value of swift SW15-0 on the D2 board should be shown in four hexadecimal four sections of HEX3-0. This part of the circuit will be combination logic. To use an active-less asynchronous reset and KEY1 to use KEY0 as the clock input, you must store SW15-0in in a 16-bit register in the value The register should be enabled to have a 16-bit positive edge, which uses the embedded D flip-flo
Read more

jasper reports - How to center align barcode using jasperreports and barcode4j -

I use iReport 5.5.0 . How to align a barcode component to the center The relevant piece of my jrxml is below & Lt; JR: Code 128 xmlns: JR = "http://jasperreports.sourceforge.net/jasperreports/components" xsi: schemaLocation = "http://jasperreports.sourceforge.net/jasperreports/components http: //jasperreports.sourceforge Purge / xsd / components.xsd "textPosition =" bottom "& gt; & Lt; Jr: codeExpression & gt; & Lt; [CDATA [$ F {number}]] & gt; & Lt; / Jr: codeExpression & gt; & Lt; / Jr: Code 128 & gt; & Lt; / componentElement & gt; "Text" itemprop = "text"> Create a style after this, it is called "barcode", like: & lt; Style name = "barcode" fontName = "Helvetica" fONTSIZE = "10" hAlign = "center" valign = "center" /> and set the property of your barcode element to "barcode".
Read more

c# - ASP.NET MVC - Attaching an entity of type 'MODELNAME' failed because another entity of the same type already has the same primary key value -

In brief, the wrapper module is inserted during posting and the status of an entry is changed to 'modified' . Before changing the state, the state is set to 'separate', but calling attachments () causes the same error to be thrown away. I am using EF 6. Model / wrapper class public class avi model {public A is a {get; Set; } Public listing & lt; B & gt; B {received; Set; } Public cc {receipt; Set; }} Administrator edit public functioning (int? id) {if (id == null) {new HttpStatusCodeResult (HttpStatusCode.BadRequest); } If (! Conveyor Access (id.Value)) new HTTPTitus code result (HTTP status code. Forbidden); Var aViewModel = new AViewModel (); aViewModel.A = db.As.Find (id); If (aViewModel.Receipt == zero) {return HttpNotFound (); } aViewModel.b = db.Bs.Where (x => x.aid == id.Value) .Oolist (); AViewModel.Vendor = db.Cs.Where (x => x.cid == aViewModel.a.cID) .FirstOrDefault (); See Return (aViewModel); } [HTPFost] [Valid AntitiferousTeacon
Read more