private void txt_f_name_TextChanged(object sender, TextChangedEventArgs e)
{
string textbox_name_1,textbox_name_2;
TextBox textbox_1 = (TextBox)e.Source;
textbox_name1= textbox_1.Text;
TextBox textbox_2 = (TextBox)e.OriginalSource;
textbox_name_2;= textbox_2.Text;
}
now both textbox_name_1 and textbox_name_2 are getting same result.
if i try to get another thing like text,with etc... these are also getting the same result....
but i think there may be some difference.
so,i want to know the major difference between e.source and e.OriginalSource.
There are cases source and original source differ.
Common cases where the source may be adjusted include content elements
inside a content model for a control (the contents of a list item, for
instance, will report the list item element as the Source and the
actual element within the list item will be the OriginalSource.
ref from MSDN:
i'm not sure what you try to do with your code. to check source and original source text property do like below, and you can do the same thing by adding list view with items having text box.
private void txt_f_name_TextChanged(object sender, TextChangedEventArgs e)
{
string textbox_name_1,textbox_name_2;
TextBox textbox_1 = (TextBox)e.Source;
textbox_name1= textbox_1.Text;
TextBox textbox_2 = (TextBox)e.OriginalSource;
textbox_name_2 = textbox_2.Text;
}
From the documentation
This originalsource property acquires its value once, before the class event handlers or any instance handlers are invoked, and is never adjusted past this point.
With routed events other events may have fired before your handler.
[OriginalSourece][1]
http://msdn.microsoft.com/en-us/library/system.windows.routedeventargs.originalsource.aspx
Related
I have one of the screen design as in the above image
Now you can see I got fill up product series approver 1 and approver 2 and so on.
But I keep getting empty value from approver 1.text or approver2.text.
What is the cause of this error??
i have found the problem. cause of postback.
it will trigger SelectedIndexChanged event
protected void CbxRejDocNum_SelectedIndexChanged(object sender, EventArgs e)
{
LoadDocumentDataRej(); // for load information
}
i remove the event during Capture Phase
CbxRejDocNum.SelectedIndexChanged -= new
System.EventHandler(CbxRejDocNum_SelectedIndexChanged);
This is how you can get combo box's selected text "comboBoxName.SelectedItem.Text"
I presume you're using ASPxClientComboBox.
You can get the text via GetText() method.
var text = mycombobox.GetText();
Windows 10 uwp app with a listview to just list out strings. First of all, I have an observable collection of strings in my xaml code behind. Because I still dont understand proper data binding in xaml, I am currently adding the strings to tje listview by doing a foreach loop on the observable collection and then doing
Listview1.Items.Add (new TextBlock {Text = myString});
However, is binding in this case as easy as setting my listview ItemsSource to my observablecollection?
My main issue though is I want to know when a user selects a string in the listview and what string they selected. So, I wired up to the listview SelectionChanged event. This event will raise when I select an item in the list, however
var selectedString = e.AddedItems.First().ToString();
Does not give me the selected string value. Also, there seems to be a possible recursion issue with this event. At one point, my breakpoint hit twice even though I had only selected an item in the listview one time.
So, main question is how to i get the selected string from the listview but also would appreciate suggestions or comments on data binding and if there could be recursion with this event.
EDIT: After trying the last two answers, I am still having some issues here. I cannot get the string that is selected. Using both answers below, I get the same results. First, there is some recursion because clearly the event does fire twice most times even when the list is selected only one time. Also, in both cases, the string is never populated with the selection. In fact, the breakpoint will hit at the line but then skip to the end of the event handler method and I cannot inspect any of the variables or arguments. I even wrapped it up in a try catch block but it never runs the rest of the code in the try block and never catches an exception. All it does is skip to the end of the event handler method but then take me to a file called SharedStubs.g.cs and in there, it hits at the end of this method
// Signature, Windows.UI.Xaml.UnhandledExceptionEventHandler.Invoke, [rev] [return] [Mcg.CodeGen.ComHRESULTReturnMarshaller] void__int, [rev] [in] [Mcg.CodeGen.WinRTInspectableMarshaller] object____mcg_IInspectable, [rev] [in] [GenericTypeMarshaller] -> T,
[global::System.Runtime.CompilerServices.MethodImpl(global::System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]
[global::System.Runtime.InteropServices.McgGeneratedMarshallingCode]
internal static int Proc_object__TArg0__<TArg0>(
object __this,
global::System.Runtime.InteropServices.__vtable_IInspectable* unsafe_sender,
void* unsafe_e,
global::System.IntPtr __methodPtr)
{
// Setup
object sender = default(object);
TArg0 TArg0__arg = default(TArg0);
try
{
// Marshalling
sender = global::System.Runtime.InteropServices.McgMarshal.IInspectableToObject(((global::System.IntPtr)unsafe_sender));
TArg0__arg = (TArg0)global::System.Runtime.InteropServices.McgModuleManager.ComInterfaceToObject(
((global::System.IntPtr)unsafe_e),
typeof(TArg0).TypeHandle
);
// Call to managed method
global::McgInterop.Intrinsics.HasThisCall__Proc_object__TArg0__<TArg0>(
__this,
__methodPtr,
sender,
TArg0__arg
);
global::System.Runtime.InteropServices.DebugAnnotations.PreviousCallContainsUserCode();
// Return
return global::McgInterop.Helpers.S_OK;
}
catch (global::System.Exception hrExcep)
{
// ExceptionReturn
return global::System.Runtime.InteropServices.McgMarshal.GetHRForExceptionWinRT(hrExcep);
}
}
And the sender in this method is ListView. After it hits in this method, the debugger just sort of hangs. I never get a real exception or error and it never really stops. I can hit continue but it just sits idle. So, the above is the only clue I really have. Not sure why this would hit but not the try/catch block and why I would never get any further exception, stack trace, etc...
Thanks!
Can you please try this one?
private void Listview1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
TextBlock textBlock = (sender as ListView).SelectedItem as TextBlock;
string value = textBlock.Text;
// OR
string value2 = (e.AddedItems[0] as TextBlock).Text;
// OR
string value3 = (e.AddedItems.First() as TextBlock).Text;
}
First of all, binding string items to a listview requires one line of code. You don't have to create a XAML template for that since you're not binding a object with properties. You can just do this:
Listview1.ItemsSource = YourObservableCollection();
It will bind your collection to your ListView.
As for the selection event, instead of SelectionChanged, you can use ItemClick event. The event args will give you the selected item aka the string by calling e.ClickedItem.
First, enable your ListView1's IsItemClickEnabled. Set it from false to true. Then add the ItemClick event.
private void ListView1_ItemClick(object sender, ItemClickEventArgs e)
{
e.ClickedItem;
}
This will return the value selected, in your case, the string.
Hope it helps!
You get the currently selected item in a ListView using the SelectedItem property and since you are adding TextBlock elements to the Items collection you should cast the SelectedItem property to a TextBlock and then access its Text property to get the string value:
private void Listview1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
TextBlock textBlock = Listview1.SelectedItem as TextBlock;
if (textBlock != null)
{
string s = textBlock.Text;
}
}
you can also use SelectionChanged event to get the value selected by user.
Here is how the code will look like :
In XAML :
ListView Name="sourceList"
ItemsSource="{Binding itemsource}"
SelectionChanged="sourceList_SelectionChanged"
In Code behind :
private void sourceList_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
string selectedSource = Convert.ToString(((ListView)sender).SelectedItem);
}
I have a combo box as shown in the code below. I would like to display the name of the selection in a message box when I select it. What I am trying is -
<dxb:BarEditItem.EditTemplate>
<DataTemplate>
<dxe:ComboBoxEdit x:Name="PART_Editor"
SelectedIndexChanged="OnSelectedIndexChanged" Name="comboBox">
<dxe:ComboBoxEdit.Items>
<system:String>Item1</system:String>
<system:String>Item2</system:String>
</dxe:ComboBoxEdit.Items>
</dxe:ComboBoxEdit>
</DataTemplate>
How can I add the code in the backend for getting the selected name inside a message box?
Do you mean to handle this on the SelectedIndexChanged event? If so you can get the combobox that triggered the event.
private void OnSelectedIndexChanged(object sender, RoutedEventArgs e)
{
ComboBox cb = (ComboBox)sender;
string selectedText = cb.SelectedText;
//Code to display the selectedText into a message box
}
I'm not sure what do you mean by the "name of the selection", so I'm assuming you want to get hold of the text that is displayed in the combo, which represents the selected item.
Once you have the combo itself in your hands:
private void OnSelectedIndexChanged(object sender, RoutedEventArgs e)
{
var combo = (ComboBoxEdit)sender;
(...)
}
you have several options. Most reliable one (in my opinion) would be to use combo.DisplayText property, which is a read-only property holding the actual text that should be displayed in the combo (with consideration of DisplayMember property, DisplayTextConverter property and CustomDisplayText event).
Another option (in your particular case) would be (string)combo.SelectedItem. Note though, that combo.SelectedItem returns the actual selected item and not it's text representation. The above is fine as long as items are of type string. Should they not be, you'll get an InvalidCastException. Also, it's possible that in that case what you get might not be what you see (as noted in previous paragraph there are several ways to modify the displayed text).
Yet another option is combo.Text, which takes into consideration DisplayMember, but not DisplayTextConverter nor CustomDisplayText.
EDIT
Turns out that at the time SelectedIndexChanged is raised, DisplayText property is not yet updated to reflect the newly selected item (which isn't especially surprising). To deal with that, you should "postpone" the retrieval of the DisplayText value. I'd personally go with something along these lines (using a Dispatcher associated with the combo):
private void OnSelectedIndexChanged(object sender, RoutedEventArgs e)
{
var combo = (ComboBoxEdit)sender;
combo.Dispatcher.BeginInvoke(new Action(() =>
{
var text = combo.DisplayText;
(...)
}));
}
just type comboboxName.Text and you will get the selected item of combobox
I am trying to associate a label with the ComboBox selected value but That label is not getting triggered.What is wrong with my code?
private void comboBoxCrewMember_SelectedIndexChanged(object sender, EventArgs e)
{
string crewMemberName=comboBoxCrewMember.Text;//ComboBox
string rankName=crewMemberManager.GetRankName(crewMemberName);
lblRankValue.Text = rankName;//label
}
My ComboBox consists of name of crew memebers which are selected and the label consists of rank of that particular crew member which is fetched by the method GetRankName.
On execution,I get the whole list of crew members'names but on selecting those names nothing happens to the label.
its quite simple bro..
private void comboBoxCrewMember_SelectedIndexChanged(object sender, EventArgs e)
{
string crewMemberName=comboBoxCrewMember.SelectedValue.ToString();
lblRankValue.Text = crewMemberManager.GetRankName(crewMemberName);
}
what u need to make sure ix that GetRankName() is returning only one value.. and thats it..
hope it helps
you can minimize thix code even..
like this
private void comboBoxCrewMember_SelectedIndexChanged(object sender, EventArgs e)
{
lblRankValue.Text = crewMemberManager.GetRankName(comboBoxCrewMember.SelectedValue.ToString(););
}
Make sure your Event is bound
Make sure your crewMemberManager.GetRankName(crewMemberName); method works fine
Make sure your ComboBox text is the value you want to parse to the crewMemberManager.GetRankName(crewMemberName); method
IF I were use , I would you something like below to retrieve the SelectedValue of combobox
comboBox1.SelectedIndex;selectedItem.ToString()
Object selectedItem = comboBox1.SelectedItem;
crewMemberManager.GetRankName(selectedItem.ToString());
And also I don' think your problem is with ComboBox or comboBox's selection, I think that your crewMemberManager.GetRankName(crewMemberName); method is caussing this issue , Please make sure that your crewMemberManager.GetRankName(crewMemberName); method works fine,
string crewMemberName=comboBoxCrewMember.Text;//ComboBox
the above will give you a string "crewMemberName", now make sure that the bellow method
crewMemberManager.GetRankName(crewMemberName)
is return type of string and it is written like bellow in the file
public string crewMemberManager.GetRankName(string name)
if not do same otherwise please provide that method for further verification.
I want to use a ComboBox with the DropDownList style (the one that makes it look like a button so you can't enter a value) to insert a value into a text box. I want the combobox to have a text label called 'Wildcards' and as I select a wildcard from the list the selected value is inserted in to a text box and the combobox text remains 'Wildcard'. My first problem is I can't seem to set a text value when the combobox is in DropDownList style. Using the properties pallet doesn't work the text value is simply cleared when you click off, adding comboBox.Text = "Wildcards"; to form_load doesn't work either. Can anyone help?
The code you specify:
comboBox.Text = "Wildcards";
...should work. The only reason it would not is that the text you specify is not an item within the comboBox's item list. When using the DropDownList style, you can only set Text to values that actually appear in the list.
If it is the case that you are trying to set the text to Wildcards and that item does not appear in the list, and an alternative solution is not acceptable, you may have to be a bit dirty with the code and add an item temporarily that is removed when the drop-down list is expanded.
For example, if you have a form containing a combobox named "comboBox1" with some items and a button named "button1" you could do something like this:
private void button1_Click(object sender, EventArgs e)
{
if (!comboBox1.Items.Contains("Wildcards"))
{
comboBox1.Items.Add("Wildcards");
}
comboBox1.Text = "Wildcards";
}
private void comboBox1_DropDown(object sender, EventArgs e)
{
if (comboBox1.Items.Contains("Wildcards"))
comboBox1.Items.Remove("Wildcards");
}
That's pretty quick and dirty but by capturing the DropDownClosed event too you could clean it up a bit, adding the "Wildcards" item back as needed.
You can select one of items on formload or in form constructor:
public MyForm()
{
InitializeComponent();
comboBox.SelectedIndex = 0;
}
or
private void MyForm_Load(object sender, EventArgs e)
{
comboBox.SelectedIndex = 0;
}
Try this
comboBox1.SelectedValue = "Wildcards";
This may be a possible solution:
comboBox1.SelectedValue = comboBox1.Items.FindByText("Wildcards").Value;