binding

问题 I have a problem with what should be a very simple ASP.NET MVC Create method. After I populate data and submit the form in the Create view (and all the validation rules are passed), the instance of the model passed to the POST method will contain either null or 0 values for every field and ModelState.IsValid will return false. I use Firebug to check the POST form parameters, and the submit action obviously has posted all the parameters from the fields. However, these parameters are not bound

问题 I have a problem with what should be a very simple ASP.NET MVC Create method. After I populate data and submit the form in the Create view (and all the validation rules are passed), the instance of the model passed to the POST method will contain either null or 0 values for every field and ModelState.IsValid will return false. I use Firebug to check the POST form parameters, and the submit action obviously has posted all the parameters from the fields. However, these parameters are not bound

问题 My angular2 component has an @Input(): data of type [number,number] . The size of the array is should be determined from the input. How can I now bind the content of this array to a table in html, i.e., the table should be something like this: <table> <tr> <td> data[0,0] </td> <td> data[0,1] </td> ... </tr> <tr> <td> data[1,0] </td> <td> data[1,1] </td> ... </tr> ... </table> 回答1: You can do this with two *ngFor-Directives: <table> <tr *ngFor="let row of data"> <td *ngFor="let value of row">{

问题 This is a continuation of a question here: Trying to setup a custom DependencyObject. Clearly missing something. It's not practical to edit the original question; changes are too great. So I'm starting a fresh question. I'm trying to setup bindings between custom DependencyObjects in my UWP app. The relevant code is below. I am seeing calls to ActualWidthPropertyChanged, but they are not triggering any call to WidthPropertyChanged. What am I missing? class WindowsElement: DependencyObject {

问题 I want to set a controls datasource to an observable collection of key value pairs, but to only display the key part of the pair. I have a 3rd party multiselect combobox. I have modified the datasource class that came with it so that it holds key value pair collections. Here is the class: public class DataSource : INotifyPropertyChanged { private ObservableCollection<KeyValuePair<string,string>> _items; public DataSource(ObservableCollection<KeyValuePair<string, string>> items) { _items =

问题 I have a Service that is supposed to maintain a constant connection with a home automation controller (HAC). In the preferences of the App, I will give the User a choice to stay** connected to the HAC or to drop the connection to the HAC when the App is not in use. I intend to use startService(), with a look at the preferences to see if it's necessary to call stopSelf() from within the Service. I basically have two questions: Is it necessary to Bind to the service from every Activity in the

问题 I've got a datababound TabControl and would like to bind the index of each TabItem to a corresponding property in my view model. The ItemsSource is an ObservableCollection, and I'm using Bea Stollnitz's Drag/Drop functionality to provide tab control re-ordering. My gut feeling is that it should be able to be handled in the data template for the tab item header, but I haven't been able to get it working. 回答1: Your TabControl.ItemsSource should be bound to your collection, so to re-arrange the

问题 If I use binding extension in attached property <TextBlock local:MyBehavior.View="{Binding A}" /> <!-- or B --> How can set value of A (or B ) property of ViewModel from that attached behavior? I do not understand: Which type to use for attached property? Binding ? BindingBase ? BindingExpressionBase ? object ? Shall I set the value immediately? Shall I wait for some event? Shall I use another dependency property to set it's value, then bind to SomeProperty and let binding do the job once

问题 I want to use only XML to bind a list to the data of a JSON file. Here is my code: XML View: <List headerText="Positions" items="{/Positions}"> <ObjectListItem title="{positions>id}"> </ObjectListItem> </List> index.html var oPositionsModel = new sap.ui.model.json.JSONModel(); oPositionsModel.loadData("model/Positions.json"); sap.ui.getCore().setModel(oPositionsModel); model/Positions.json { "Positions": [ { "id": 123456, "article": "Abcde", "amount": 12 }, { "id": 654321, "article": "Edcba",

问题 I created a UserControl that has a ContentControl in it. This ContentControl gets Buttons from the normal .xaml-pages. But depending on some events I need to change this Button's Label or Image but i am getting a NullReferenceException. UserControl1.xaml <Grid> <!-- different Stuff that needs to be around --> <ContentControl Content="{Binding UserControlContent, ElementName=userContent}"/> </Grid> UserControl1.xaml.cs public static readonly DependencyProperty AppBarContentProperty =