updatesourcetrigger

问题 Just a short question : In wpf, how do I set and get updatesourcetrigger of a textbox in codebehind ? Thanks Update : I follow AngleWPF's code : var bndExp = BindingOperations.GetBindingExpression(this, TextBox.TextProperty); var myBinding = bndExp.ParentBinding; var updateSourceTrigger = myBinding.UpdateSourceTrigger; But I got the exception : An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in PresentationFramework.dll Additional information: Exception

问题 Just a short question : In wpf, how do I set and get updatesourcetrigger of a textbox in codebehind ? Thanks Update : I follow AngleWPF's code : var bndExp = BindingOperations.GetBindingExpression(this, TextBox.TextProperty); var myBinding = bndExp.ParentBinding; var updateSourceTrigger = myBinding.UpdateSourceTrigger; But I got the exception : An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in PresentationFramework.dll Additional information: Exception

问题 I saw this example - Binding.UpdateSourceTrigger Property in the example the UpdateSourceTrigger set to Explicit and then in the view code he call to UpdateSource of the TextBox name. But if i use the MVVM dp i dont want to have names to my controls and source properties are in the VM and not in the view so what is the right way to bind controls to VM properties and set the UpdateSourceTrigger to explicit? I want to do this because in my case its ShowDialog window and I want that the source

问题 I have a combo box (in my wpf-mvvm app). I have set IsEditable = true . But the "property changed event" is getting fired when I start typing. How can I set UpdateSourceTrigger = Propertychanged here ? Also..I need to call a validation function if user has entered new value ( i mean other than those available in list ..using edit functionality). Any help will be appreciated. <ComboBox ItemsSource="{Binding Path = PlanTypeBasedContractNumberList }" Width="90" IsEditable="True" SelectedValue="

问题 I have a Silverlight 2 application that validates data OnTabSelectionChanged. Immediately I began wishing that UpdateSourceTrigger allowed more than just LostFocus because if you click the tab without tabbing off of a control the LINQ object is not updated before validation. I worked around the issue for TextBoxes by setting focus to another control and then back OnTextChanged: Private Sub OnTextChanged(ByVal sender As Object, ByVal e As TextChangedEventArgs) txtSetFocus.Focus() sender.Focus(

问题 I'm using WPF Toolkit DataGrid and DataGridComboBoxColumn. Everything works well, except that when selection change happens on the combobox, the selectedvaluebinding source is not updated immediately. This happens only when the combobox loses focus. Has anyone run into this issue and any suggestions solutions ? Here's the xaml for the column: <toolkit:DataGridComboBoxColumn Header="Column" SelectedValueBinding="{Binding Path=Params.ColumnName, UpdateSourceTrigger=PropertyChanged}"

问题 I have two-way binding between a DataGrid and an object. I want to only save changes made in the DataGrid to the object when the user clicks a save button. As a first step, I set UpdateSourceTrigger=Explicit. I would have expected no binding to occur when I set that property to explicit (since I have not called UpdateSource() yet), but contrary to my expectation, the changes are bound to the object when I close and restart the program. Why are my changes still binding to my object's settings?

问题 I am sure most of you have come across this when you type in a textbox you like instantly to filter a ViewCollection according to has been typed. Its very straight forward in WPF, just change the UpdateSourceTrigger for Text binding to PropertyChanged. As you would expect Silverlight doesnt have it. There is just a default and explicit instead. I had the idea to bind an Interaction behavior to TextChanged event of the textbox instead. Would you recommend this approach or is there a better way

问题 I'm using MVVM and have the following problem. My TextBox.Text is bound with UpdateSourceTrigger=LostFocus (thats what the user want). I have a Button with a SaveCommand CommandBinding - this works. Now i have a KeyBinding with Strg+S wich also execute the SaveCommand. And here is the problem: when i m in the Textbox and press Strg+s, the changes are not in the viewmodel. is there any way to get MVVM Commands with KeyBinding and TextBox UpdateSourceTrigger=LostFocus working together? some

问题 I have following code: <Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300"> <Grid> <TextBox Text="{Binding Path=Name, Mode=OneWayToSource, UpdateSourceTrigger=Explicit, FallbackValue=default text}" KeyUp="TextBox_KeyUp" x:Name="textBox1"/> </Grid> public partial class Window1 : Window { public Window1() { InitializeComponent(); } private void