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I am trying to set tags for individual Combobox items. In looking through the Combobox doc, I cannot find the equivalent of SetItemData/GetItemData. The tag property is set at the Combobox level, and not at the item level. Can someone point me to an example, or how to set the tags for invidual combobox items. I would like to store database record ids as tags in the combobox.
Gaulles
Gaulles
Gaulles Technologies, Inc.
http://www.gaulles.com
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Hi
Do this:
public class ComboBoxItem
{
object tag = null;
string text = null;
public ComboBoxItem(string text)
{
this.text = text;
}
public object Tag {get {return tag;} set {tag = value;}}
public override string ToString(){return text;}
}
Now just add these objects to ComboBox.Items. ie
comboBox1.Items.Add( new ComboBoxItem("some text"));
You can set/get the tags via:
object tag = ((ComboBoxItem) comboBox1.Items[i]).Tag;
Hope this helps
Give them a chance! Do it for the kittens, dear God, the kittens!
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I thought of doing something similar, but because this was already part of MFC (SetItemData/GetItemData), I was digging around to see if it is already part of the .NET framework ComboBox class. I cannot understand it when MS takes away features that were already existing, and used by several applications.
Thanks for the info. I will implement it.
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Gaul wrote:
I thought of doing something similar, but because this was already part of MFC (SetItemData/GetItemData),
You will ussually add an object to ComboBox.Items and then just override the ToString() method in the objects's class. Alternatively, you can display any property (obvously the ToString() method gets called on the Property's reflected type) with ComboBox.ValueMember. NOTE: however there is a bug ,according to me anyways, when the ComboBox gets sorted and retrieving SelectedItem in relation to SelectedValue. Allways makes sure the object is the same.
Hope this helps
Give them a chance! Do it for the kittens, dear God, the kittens!
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Gaul wrote:
I cannot understand it when MS takes away features that were already existing, and used by several applications.
On the contrary, the functionality is still there; just how you use it is changed.
Rather than following the MFC paradigm where you added strings then set related data separately; you just add the data and tell the combobox how to represent it (by setting the DisplayMember and ValueMember properties of the combobox, if DisplayMember isn't set it defaults to calling ToString() )
James
"And we are all men; apart from the females." - Colin Davies
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hi!
i try to devolop an add-in for outlook xp which uses the SelectionChange event. If you select a contact the eventhandler adds or removes a command bar control. so far it works fine. but if you click the new button the supposed action works fine, but afterwards no event works anymore. you would have to restart the application to make it work again. any ideas what might be wrong and how i can solve the problem. (i'm using the pi's from microsoft)
thanks in advance
benedikt
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Hi
Maybe the event resets after one use???? Try initializing it again when dealing with the event.
Hope it works
Give them a chance! Do it for the kittens, dear God, the kittens!
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thanks for the answer. i had the same idea but it didn't work.
benedikt
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DOPE
Maybe theres another event firing??? I havent looked at it yet. I dont even trust Outlook so I dont have it installed.
Cheers
Give them a chance! Do it for the kittens, dear God, the kittens!
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no event is fired any more.
i don't know what to do. nothing else than problems....
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Hey!
I've got a problem with my custom collection! The collection is used as a type for a property in my control. When I put the control to the form in the Designer, and Click the (... ) button at that property, new window is shown. I can add and remove elements in collection. But when I click the Add button, the type of new element is System.Object , not the type of elements of my collection.
I want to do sth like ListView.ListViewItemCollection , which is editable through the designer!
Thanks!
Ñ There is only one MP Ð
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Hi
I assume you are inheriting from ArrayList. You should inherite from CollectionBase and expose the protected List 's methods as it needs like:
public virtual void Add(Item value)
{
this.List.Add(value);
}
I did this in a few minutes and everything works 100%. IMPORTANT: Like all designer related stuff, the custom (really a strongly typed) collection as well as the objects inserted into the collection MUST have default constructors.
Cheers
Give them a chance! Do it for the kittens, dear God, the kittens!
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Strange! Take a look at my code:
public class R
{
public R(){a=10;b=56;}
int a, b;
public int A{
get{return a;}
set{a = value;}}
public int B
{
get{return b;}
set{b = value;}
}
}
public class Col: CollectionBase
{
public Col(){}
public virtual void Add(R valueT)
{
this.List.Add(valueT);
}
}
But the designer still adds the System.Object item, not the R item. What's wrong?
Ñ There is only one MP Ð
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Hi MP
Actually I realised today that you just need the indexer
CollectionEditor from MSDN:
Notes to Inheritors: This editor can edit collections that have an Item property. The editor can determine the type of the collection from the Item property, if it exists. If the collection does not have this property, or if you want to provide collections of more than one type, you can override certain protected members of this class to customize the editor to support other types of collections.
so just do this:
public MyItem this[int i]
{
get {return (MyItem) base.List[i];}
set {base.List[i] = value;}
}
Cheers
Give them a chance! Do it for the kittens, dear God, the kittens!
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Thanks!
Now it's working!
Ñ There is only one MP Ð
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I want to do something like this:
Type t1=Type.GetType("UserControl");
UserControl Control = (UserControl)Page.LoadControl("Components/UserControl.ascx");
control = (t1)Control;
while compiling,system say "could not find type or naming space t1".
How can I use my type to define a variable?
Thanks!
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<br />
UserControl control = (UserControl)Page.LoadControl("Components/UserControl.ascx");<br><br />
Type t1 = control.GetType();<br><br />
More info : MSDN doc[^].
MS quote (http://www.microsoft.com/ddk) : As of September 30, 2002, the Microsoft® Windows® 2000 DDK, the Microsoft Windows 98 DDK, and the Microsoft Windows NT® 4.0 DDK will no longer be available for purchase or download on this site.
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Winona wrote:
How can I use my type to define a variable?
You can't.
What you are trying to do is something called Late-binding which isn't supported natively by C#.
What you can do is use the methods in the Type class to use your class at run-time. In particular the InvokeMember can be used to get or set properties, run methods, etc.
There is an example in MSDN which will show you how to use it.
James
"And we are all men; apart from the females." - Colin Davies
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Thanks all,I followed you advice and it worked.
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I would like to have the forms FormBorderStyle property set to any of the form border styles and then still be able to make the title bar thinner or taller.
Can someone help explain how to do this please.
Coding is a way of life. It's in the air we breath. It pumps through our vines. Without it we soon crumble to dust. - Rodney S. Foley
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(or change a FixedToolWindow to have round corners)
I would like to have the forms FormBorderStyle property set to any of the form border styles and then still be able to make the title bar thinner or taller. Would love a pure C# solution, but a InterOp would be acceptable.
Basically I would love to have a small narrow size like the FixedToolWindow title bar, but with ROUNDED CORNERS on the form not square. So actually either changing a normal size title bar to be thinner or changing a FixedToolWindow to have round corners. Which ever is easier.
I have been trying to figure this out for the last 3 days, so any help would be appreciated.
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Hi
You can try doing a borderless window, and do the toolbar, round corners, etc yourself, but it really sounds like alot of work
Cheers
Give them a chance! Do it for the kittens, dear God, the kittens!
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I have a dataTable set as the Datasource of of a dataGrid via a DataView.
The Table contains an ID field and a Description field, of which only the Description is displayed in the grid.
I want to be able to programatically retrive the ID from the DataTable based on a row in in the DataGrid.
How can I do this, even if the grid has been sorted?
Thanks
Stephen.
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If the ID is still bound to a column which is marked as not visible then you should still be able to access it as if it was visible.
Paul
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