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A m ulti-column comboxthat can link to a dataset oran array of objects.Supports the hiding ofcolumns and the reorderingof visible ones. Thecombobox can display afield (like a code) while thelinked text box can show

the correspondingdescription. Supports auto-completion andRightToLeft langua

Type Article

Licence CPOL

First Posted 14 Aug 2007

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Searchable MultiColumn ComboBox with Linked TextBoxBy Darryl Caillouet, 31 Jan 2008

Download demo - 14.9 KB

Download source - 42.2 KB

Version 1.3 - Searchable with fixed width / hidden columns. Supports RightToLeft languages.

Introduction

Some of the users that I write programs for have to fill out forms that consist of selecting many codes from combo

boxes. These codes are fixed. The average user can not enter new codes but must select from a predetermined list of

values. The people who do the data entry are very familiar with the codes and are keyboard centric. They don't want to

use a mouse each time they enter a value. The people who view the data but don't do a lot of data entry are not as

familiar with the codes but want to see the more verbose text descriptions that each code is associated with.

The solution that I was trying to create was a multicolumn ComboBoxthat was linked to a read-only TextBox. When a

user selected an item from the ComboBox, it would display both the code and the description in a multicolumn

dropdown list. But when the ComboBoxclosed, I wanted to display the code in the ComboBox, and the description inthe TextBoxthat was linked to it. The code in the ComboBoxwould be bound to the database, and the TextBox

would be unbound and for informational purposes only. This way, both sets of users would be able to see the

information that was most important to them.

I also wanted to force the user to only select items that were in the ComboBoxlist. The user could not enter any text

that was not valid. So this control can operate in one of two modes:

1. AutoComplete= true. When AutoCompleteis set to true, the control behaves like a

ComboBoxStyle.DropDown. The user can type in a value, and it will auto complete based on the associated list

of values. If the user types a letter that will cause an invalid code to be entered, that keystroke is suppressed.

2. AutoComplete= false. When AutoCompleteis set to false, the control behaves like a

ComboBoxStyle.DropDownList(even though it actually has a ComboBoxStyle.DropDownvisual style). In

this mode, the user can hit a letter or number and the control will cycle through all of the list values that start

with that letter or number. But the closed ComboBoxnever displays the dividing lines between the columns like

a ListBox. It only shows the code value, no matter how wide the ComboBoxis.

Background

This article and the control I created would not have been possible if not for the work of Nishant Sivakumarand the

MultiColumn ComboBoxcontrol that he wrote. It was his work that helped me overcome all the tough obstacles that

were stopping me from creating what I needed. Once I found his code, I was able to create a solution in about a day. If

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you like this control and find it useful, thank him first (and most). Instead of duplicating all his documentation here, I

would suggest you read about the control on his page if you want a better understanding of how my control works.

I would also like to acknowledge Laurent Muller since I used his forum suggestion as a basis for my auto-complete

functionality.

Using the code

To use this code, all you have to do is select the MultiColumnComboBoxfrom the toolbox along with a TextBoxand

put them on a form.

Then, you can set the following properties:

AutoComplete: True makes it behave like an auto completing dropdown. False makes it behave like a read-only

dropdownlist.

AutoDropdown: When you press a key, it will automatically drop down the list so you can see the choices. In

AutoComplete= truemode, it will automatically close when you've typed in a valid selection.

BackColorEven: The back color of the even items in the list. The default is white.

BackColorOdd: The back color of the odd items in the list. The default is white. I always use a forecolor of black

so I did not code an Odd/Even forecolor property.

LinkedColumnIndex: What is the index of the column that you want the TextBoxto display? The majority of

my forms have the ComboBoxdisplay column 0 and the TextBoxdisplay column 1.

LinkedTextBox: Select a TextBoxfrom the dropdown list of controls on the form. When a TextBoxis linked

to the ComboBox, it is automatically set to ReadOnly= trueand TabStop= falseat design time.

Hitting the Escape key clears the ComboBoxand its associated TextBox.

Version 1.1 changes

Once I started using the control and became a little more familiar with the code Nishant had written, I realized there

were a few changes that I wanted to make in order to have it behave the way I needed it to. So I tweaked it a little:

1. The Delete key clears the control and the linked TextBoxin the same way the Escape key did in the original

version.

2. The Backspace key behaves like a left arrow key. It doesn't remove letters from the code since I wanted to

enforce only valid selections. It just moves the caret back a space and repositions the list accordingly.

3. The original version iterated through every item that was going to be in the dropdown list and dynamically set

the column widths. As another member pointed out in the feedback, this was a problem when linking to objects

with many public properties as they all showed up in the list. I decided to make the column width a user

specified item so that columns could be hidden by setting the value to zero.

4. I added an example to the demo that shows one way to programmatically reference a hidden column of aselected combobox item, in case someone wanted to hide a column but use something like an ID or key value.

Adding these features added two more properties:

ColumnWidthDefault: If a column width is not explicitly declared, this will be the width of the column.

ColumnWidths: A delimited string of column widths. To implement this feature, I copied a Microsoft Access

idiom of using a semi-colon delimited string to specify the column widths. A blank column is set to the default.

Here are a few examples:

Collapse | Copy Code

ColumnWidthDefault = 75ColumnWidths =

Result: Every column will be displayed with a default width of 75.

Bound to an object with six columns:


ColumnWidthDefault = 75ColumnWidths = 100;;200

Result: Column0 = 100, Column1 = 75 (default), Column2 = 200; the remaining three columns all default to 75.

Bound to an object with three columns:


ColumnWidthDefault = 75ColumnWidths = 0;50;150

Result: Column0 is hidden with a width of zero, Column1 = 50, Column2 = 150.

Bound to an object with six columns:


ColumnWidthDefault = 0ColumnWidths = 50;100

Result: Column0 = 50, Column1 = 100, all the rest are hidden because they are the default value of zero.
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Version 1.2 changes

Binding the control to an array of objects that has a large number of properties was causing problems. While a dataset

will display its columns in the order they are defined, an object with a lot of public properties would display the

properties in the dropdown list in a random order. This made it impossible to use column indexes to set column widths

since there was no guarantee that a column would always be tied to a particular index.

To solve this problem, I added a new property so that the programmer could define which columns would be displayed

by name and which order they would appear.

ColumnName: A delimited string of column names. The order of the names determines the order of the columns.

A blank string shows all the columns. An example would look like this:Collapse | Copy Code

ProductCode;ProductCategory;ProductDescription

A few of the dropdown lists in my program have a lot of codes (several hundred). The majority of the time, the users

select a few very common choices that are easily memorized. But when a new user is learning the system or an

experienced user needs to locate a rarely used item, some kind of search utility can be helpful.

For this reason, I added a OpenSearchFormevent to the class. When a user hits the key (the standard Windows

search key), this event gets fired. The programmer can then create any kind of search form he likes and tie it to this

event. I added an example search form to the demo where the user can enter a search word, hit the Enter key, and the

string will be located in the search grid. Double-clicking an item in the grid sets the value in the ComboBoxand closes

the form. To test this, the user should go to a ComboBoxthat lists all the states, hit , type in the word "North",

and hit the Enter key several times to see it loop through states it finds.

To open the search form in my demo program, I added a single routine:


privatevoidmultiColumnComboBox_OpenSearchForm(objectsender, EventArgs e){ FormSearch newForm = newFormSearch((MultiColumnComboBox)sender); newForm.ShowDialog();

}

I then link the OpenSearchFormevent of each ComboBoxon the form to this single event. The search form that is

opened then sets the DataSourceof the search form's DataGridViewto the DataSourceof the passed ComboBox.

I use the ColumnNameCollectionand the ColumnWidthCollectionof the passed ComboBoxto determine which

columns to display in the grid.

This search routine worked fine for all of my examples except one. If the data source of a ComboBoxwas an array of

objects that exposed a lot of properties, the dropdown list would look fine if I used the ColumnNamesproperty to only

display the properties I wanted to see:
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But if I hit the key to open the search form, the list would lose its ordering:

Instead of showing Property0, Property1, Property2, it would show the columns in the random order of the underlyingarray. Even when I hardcoded the positions, it would still ignore these settings in this one instance. The searching and

the double-clicking worked fine, just the columns weren't in the order I wanted them to be. Small objects and

DataSets worked like they should.

The only way I was able to solve this was to have the large class implement an interface that only exposed the

properties that should appear in the ComboBox:


//An interface that only shows properties 0, 1 & 2

publicinterfaceICombo012{

stringProperty0 { get; }

stringProperty1

{ get; }

stringProperty2 { get;

}}

// A class that has 10 properties but can display

// properties 0, 1 & 2 or properties 1 & 9

// through two different interfaces

publicclassComplexObject : ICombo012, ICombo19{ //Class with 10 properties defined here

}

Binding the ComboBoxto the smaller interfaces allowed me to use the larger objects without problems. I do not know

if this is the best way to solve this problem, but since this is a learning process for me, I'm sure someone will point out

a more elegant solution if one is available. My goal is to post each set of improvements even if it has a few problems, in

the hopes that I'll eventually be able to refine this into a control that will be useful and reliable.

Version 1.3 changes

I added support for RightToLeftlanguages. If the language is LeftToRight, I draw the strings in the OnDrawItem



Darryl CaillouetSoftware Developer (Senior)

United States

I wrote my first program on a Tandy computer using a 1963 black & white Zenith TV for a

monitor.

I wrote my second program in Fortran using a card punch machine.

I've been hooked ever since...

event, starting with column zero and ending with the last column, using the default settings. If the language is

RightToLeft, I draw the columns in reverse order from the highest index down to zero. I also use a StringFormat

object to align the strings in a RightToLeftstyle.

This update also exposed a small "flaw" in the earlier versions. When setting the DropDownWidthin the OnDropDown

event, I didn't calculate the width of the vertical scrollbar if it was present. In a LeftToRightlanguage, this would

truncate trailing characters of the last column, and could be "fixed" by making the last column wider.

But with RightToLeftlanguages, the presence of the vertical scroll bar would obscure significant characters of the

first (rightmost) column. The only way to fix this was to make sure the width of the vertical scrollbar was also added

whenever the Items.Countwas greater than the MaxDropDownItems.

Version 1.3.1 changes

I received an email from Onno Sloof in the Netherlands suggesting that adding the following line:


protectedoverridevoidOnSelectedValueChanged(EventArgs e){

base.OnSelectedValueChanged(e);

.

.

.

}

to the OnSelectedValueChangedevent would help with databinding. As per his suggestion, I added this line toversion 1.3.1.

History

January 31, 2008 - Version 1.3.1 published.

December 26, 2007 - Version 1.3 published.

August 24, 2007 - Version 1.2 published.

August 22, 2007 - Version 1.1 published.

August 14, 2007 - Article first published.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

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My vote of 5

Using this with VB Code

Multicolumns Search

Column Header & Alignment [modified]

Re: Column Header & Alignment

Re: Column Header & Alignment

My vote of 5

Unable to use this in List

Re: Unable to use this in List

My vote of 5

My vote of 5

Auto-size column width

Windows 7 Aero bug? [modified]

My vote of 5

Datagrid

Re: Datagrid

Version [modified]

AutoComplete Problem ?

How to add image

Re: How to add image

_SelectedIndexChanged event

Re: _SelectedIndexChanged event

key does not work [modified]

Re: key does not work

Re: key does not work
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Searchable MultiColumn ComboBox With Linked TextBox - CodeProject