C# – How get Event “item Selected” with AutoComplete in C#

autocompletec++

I have code using an AutoCompleteStringCollection:

    private void txtS_TextChanged(object sender, EventArgs e)
    {
        TextBox t = sender as TextBox;
        string[] arr = this.dbService.GetAll();

        if (t != null)
        {
            if (t.Text.Length >= 3)
            {
                AutoCompleteStringCollection collection = new AutoCompleteStringCollection();
                collection.AddRange(arr);                    
                this.txtSerial.AutoCompleteCustomSource = collection;
            }
        }
    }

How can I get the event for "item selected" after user selects an AutoComplete suggestion? And value of field?

Best Solution

There's no such thing as chosen item Event for a textBox, which I believe you're using for the AutoComplete. What you could do is add a key down event to your textBox. There you could verify if the enter key was pressed (clicking on a suggested link is the same as pressing enter). Something like that:

private void textBox1_KeyDown(object sender, KeyEventArgs e) {
    if (e.KeyData == Keys.Enter) {
        String selItem = this.textBox1.Text;
    }
}

Related Solutions

Html – How to disable browser autocomplete on web form field / input tags

Firefox 30 ignores autocomplete="off" for passwords, opting to prompt the user instead whether the password should be stored on the client. Note the following commentary from May 5, 2014:

The password manager always prompts if it wants to save a password. Passwords are not saved without permission from the user.

We are the third browser to implement this change, after IE and Chrome.

According to the Mozilla Developer Network documentation, the Boolean form element attribute autocomplete prevents form data from being cached in older browsers.

<input type="text" name="foo" autocomplete="off" />

C# – Cross-thread operation not valid: Control accessed from a thread other than the thread it was created on

As per Prerak K's update comment (since deleted):

I guess I have not presented the question properly.

Situation is this: I want to load data into a global variable based on the value of a control. I don't want to change the value of a control from the child thread. I'm not going to do it ever from a child thread.

So only accessing the value so that corresponding data can be fetched from the database.

The solution you want then should look like:

UserContrl1_LOadDataMethod()
{
    string name = "";
    if(textbox1.InvokeRequired)
    {
        textbox1.Invoke(new MethodInvoker(delegate { name = textbox1.text; }));
    }
    if(name == "MyName")
    {
        // do whatever
    }
}

Do your serious processing in the separate thread before you attempt to switch back to the control's thread. For example:

UserContrl1_LOadDataMethod()
{
    if(textbox1.text=="MyName") //<<======Now it wont give exception**
    {
        //Load data correspondin to "MyName"
        //Populate a globale variable List<string> which will be
        //bound to grid at some later stage
        if(InvokeRequired)
        {
            // after we've done all the processing, 
            this.Invoke(new MethodInvoker(delegate {
                // load the control with the appropriate data
            }));
            return;
        }
    }
}

Best Solution

Related Solutions

Html – How to disable browser autocomplete on web form field / input tags

C# – Cross-thread operation not valid: Control accessed from a thread other than the thread it was created on

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