How do I get autosuggestions in textbox using last digits of a value in windows applications

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I am working on windows applications. I have a text box with autosuggestion on. i have added few values in autosuggestioncollection. if i type first letter of the value,it is suggesting the added values but if i type last few letters of the value. I need it to show the suggestions even if i enter the last few letters of the value.

What I have tried:

C#

AutoCompleteStringCollection mycollection = new    AutoCompleteStringCollection();
mycollection.Add("TEST12345");
mycollection.Add("TEST13456");
mycollection.Add("TEST22222");
mycollection.Add("TEST99999");
textBox1.AutoCompleteCustomSource = mycollection;

Posted 6-Mar-18 2:15am

Kishore yasoju

Updated 7-Mar-18 21:48pm

Leo Chapiro

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Maciej Los · Answer 1 · 2018-03-07T21:48:00

Solution 1

Well... This is normal behaviour of control with AutoCompleteCustomSource[^], because it automatically completes input strings by comparing the prefix being entered to the prefixes of all strings in a maintained source.

If you would like to change it, you have to create textBox1_Click event and there you can implement a method which compare entered string with a string of custom source. For example:

C#

TextBox txt = (TextBox)sender;
if(txt.Text.Length<2) return;
string s = txt.Text;
s = txt.AutoCompleteCustomSource.OfType<string>.FirstOrDefault(x=> x.Contains(s));
if(s != string.Empty) txt.Text = s;

It works as expected, when below properties of TextBox are set as shown:

C#

AutoCompleteMode = SuggestAppend;
AutoCompleteSource = CustomSource;

Posted 7-Mar-18 21:48pm

Maciej Los

Comments

Kishore yasoju 12-Mar-18 1:58am

I got an error like: System.Linq.Enumerable.OfType<tresult>(System.Collections.IEnumerable)' is a 'method', which is not valid in the given context

Maciej Los 12-Mar-18 3:01am

Very strange... It works form me (a framework in project is set to 4.5).
Try to replace this:

s = txt.AutoCompleteCustomSource.OfType<string>.FirstOrDefault(x=> x.Contains(s));

with:

s = txt.AutoCompleteCustomSource.Cast<string>.FirstOrDefault(x=> x.Contains(s));

Let's see if it helps.
What version of framework you use in your project?

Kishore yasoju 12-Mar-18 3:08am

I tried that Maciej, but i got the same error
"System.Data.EnumerableRowCollectionExtensions.Cast<tresult>(System.Data.EnumerableRowCollection)' is a 'method', which is not valid in the given context". By the way I am using Visual Studio 2008 and I am working on a windows CE application.

Maciej Los 12-Mar-18 3:14am

VS 2008 supports .NET framework 3.5. What is yours?
Both methods are available in VS 2008 for WinCE. See:
Enumerable.OfType(TResult) Method (System.Linq)[^]
Enumerable.Cast(TResult) Method (System.Linq)[^]

Kishore yasoju 12-Mar-18 3:17am

Mine is.NET framweork 3.5

How do I get autosuggestions in textbox using last digits of a value in windows applications

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How do I get autosuggestions in textbox using last digits of a value in windows applications

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