selecteditem

问题 I have a ListView in Virtual Mode. I wanna to access SelectedItems property. But when I use ListView1.SelectedItems , I receive the following Exception : Cannot access the selected items collection when the ListView is in virtual mode How can I access to ListView1.SelectedItems in VirtualMode. 回答1: It is quite old post but maybe someone else will benefit. Simply use ListView.SelectedIndexCollection col = listView.SelectedIndices; Then you can access an item: forearch(var item in col) { string

问题 List<Customer> _customers = getCustomers().ToList(); BindingSource bsCustomers = new BindingSource(); bsCustomers.DataSource = _customers; comboBox.DataSource = bsCustomers.DataSource; comboBox.DisplayMember = "name"; comboBox.ValueMember = "id"; Now how do I set the combobox's Item to something other than the first in the list? Tried comboBox.SelectedItem = someCustomer; ...and lots of other stuff but no luck so far... 回答1: You should do comboBox.SelectedValue = "valueToSelect"; or comboBox

问题 I'm new to XAML and Windows Phone 7 SDK. I'm developing an Windows Phone 7 application and I don't know how to detect selected item from the ListBox. I'm using panorama template, here is my code: <controls:PanoramaItem Header="Basic"> <ListBox Margin="0,0,-12,0" Name="MyListBox" SelectionChanged="Elementary_SelectionChanged"> <ListBox.ItemTemplate> <DataTemplate> <StackPanel Orientation="Horizontal" Margin="0,0,0,17"> <Image Height="100" Width="100" Source="{Binding LevelPassedImage}" Margin=

问题 I have two arrays. One is $categories which contains all categories retrieved from my db and the other is $preSelectedCategories which contains the categories that needs to be pre-selected in my check box list when my form is loaded. I tried to do this: <?php echo $form->labelEx($model,'category_id'); ?> <?php echo $form->checkBoxList($model, 'category_id', $categories, $preSelectedCategories, array('multiple'=>true)); ?> <?php echo $form->error($model,'category_id'); ?> But I did not succeed

问题 I have a Spinner that's populated using a cursor containing data from a database. It appears that it's impossible to set the selected item in the spinner using the value of the ID column of a row. And that the only way to set the selected item is by using the position of the row within the dataset. Is this correct? If so, is there a more efficient way of determining the row's position than by iterating through the dataset using the cursor? The inefficient (to my mind) way is outlined here.

问题 Following scenario: <ComboBox ItemsSource="{Binding Path=Names}" SelectedItem="{Binding Path=Name, UpdateSourceTrigger=PropertyChanged}"> </ComboBox> Names is a string collection which might change through code in the ViewModel. For example Names could be set to either male names (John, Paul, George) or female names (Mary, Jane, Karen). Let's assume the male collection is active and the user selects "John" making it the SelectedItem. Now the collection changes to female names. By default the

问题 I have a ComboBox and I have set the combo.ItemsSource property to a List object. The Book class contains two properties: "Abbreviation" and "Name". I have set the ComboBox's DisplayMemberPath to " Abbreviation " but the following style that is set on the ComboBox does not display the Abbreviation property, but instead shows " Words.Book " which is the name of the class. The ComboBox drop-down displays a list correctly (Using the specified Abbreviation property). The problem is in the

问题 OK, this must be a duplicate question, but I cannot find the answer: I have a listbox that is databound to a Collection. By default Items[0] is selected. How can I prevent this in order to ensure that the SelectionChanged event is raised any time I click a ListBoxItem? EDIT: I had already dismissed the SelectedIndex=-1 route, but I tried again: Setting the SelectedIndex to -1 in the Listbox's constructor (or as an attribute in XAML) does not work. It seems that the listbox is populated after

问题 I have the following code in a custom user control that contains a DropDownList named ddlAggerationUnitId. The DropDownList is DataBind'd on the Page_Load() event. The "value" is set to be 40 and it DOES exist. If I remove the logic for the set method the page will load and select the correct item, but if the value is bogus the page throws an exception. I'd like to avoid that exception by seeing if the value exists BEFORE trying to set it, hence why the logic is necessary. Right now it looks

问题 I'm trying to get all the selected items ValueMember from a ListBox with C#. For ex.: I've a list like this: ID | Name and Lastname ---------------------- 1 | John Something 2 | Peter Something2 3 | Mary Smith This structure is part of my ListBox. I've builded this listbox with this code: private void fill_people_listBox() { this.listBoxPeople.DataSource = db.query("SELECT ...."); this.listBoxPeople.DisplayMember = "people_name_last"; this.listBoxPeople.ValueMember = "people_id"; } The