event-handling

calling a event handler within another event handler?

由 别来无恙 提交于 2019-12-01 04:38:19
问题 Here is the short sample code: private void txtbox1_DoubleClick(object sender, EventArgs e) { button1_Click(object sender, EventArgs e); //can I call button1 event handler? } private void button1_Click(object sender, EventArgs e) { MessageBox.Show(txtbox1.Text); } I wonder if it would be okay to code in the above way? 回答1: You can do that - although the code you provide can't be compiled. It should look like this: private void txtbox1_DoubleClick(object sender, EventArgs e) { button1_Click

How can I retrieve the previous value of a DataGridView cell using the CellValueChanged event?

由 故事扮演 提交于 2019-12-01 03:27:53
问题 I am writing a C# application that uses a DataGridView and I would like to validate the input each time a user changes the data that's there. I began by using the CellValidating event which has a really nice CancelEdit() method that will return the cell to its previous value. However, this event is fired every time the user leaves the cell, regardless of whether or not it has changed. Does CellValueChanged support a sort of cancel or rollback method to the previous value? This way I would be

How do I prevent any button click events from queuing until the event handle is finished with the first call

由 落花浮王杯 提交于 2019-12-01 02:58:28
问题 I want to prevent a button click from queuing. In testing I have a Form, a Button and in the Code-Behind I have the event handler: private void button1_Click(object sender, EventArgs e) { if (_codeRunning) return; _codeRunning = true; //Application.DoEvents(); //button1.Enabled = false; _click ++; Debug.WriteLine("Click Number: " + _click); Task.Delay(5000).Wait(); //button1.Enabled = true; _codeRunning = false; } When I run debug and click the button twice or three or four times rapidly,

How to make live custom events in jQuery

由 橙三吉。 提交于 2019-12-01 02:52:25
问题 jQuery has a really handy event binder called live() which will add events to DOM elements on the fly (even for the elements that will be added later to the DOM). The problem is that it's only working on specific events (listed here in documentation). I really want to have live events for focus,blur and change which is not supported by live right now. Besides, if I can make live custom events, it will be big game changer for my app. Most of the code that I have right now is dedicated to

Sencha Touch 2 - prevent a-href events (a-href event handling)

由 心已入冬 提交于 2019-12-01 02:44:10
问题 in my Sencha Touch 2 application I need to handle redirection events on my own. By this I mean I need to be able to handle a href events and do the redirection myself. I'm using the following code: Ext.Viewport.element.addListener("tap", function(e) { e.stopEvent(); e.stopPropagation(); e.preventDefault(); var href = e.target.getAttribute("href"); // ... my code ... }, this, {delegate: "a"}); By none of the above mentioned functions work (stopEvent, stopPropagatioon, preventDefault). The

How can I mimic the behaviour of stopImmediatePropagation() (without using jquery)

由 馋奶兔 提交于 2019-12-01 02:35:04
问题 I'm working on the event-handling code for a Javascript library, and I'm trying to implement something similar to stopImmediatePropagation() that will also work in IE 6. The way the event handing works currently, is that our event handing code registers with the object, and then users register all their events with our event handlers. The first way I tried to emulate stopImmediatePropagation() was to simply add that method to the event if it didn't already exist: if (event != null && event

spring eventListener with external condition

由 纵然是瞬间 提交于 2019-12-01 02:31:31
问题 I need a flexible filters for FooEvents for multiple EventListeners all over my code. I can use @EventListener(condition="event.enabled"), but my filters require many attributes of fooEvent to be analysed. I was hoping that I could use a Predicate-Bean from my Application Context: @Component public class FooPredicate implements Predicate<FooEvent> { public boolean test(FooEvent event) {...} } ... @EventListener(condition="${fooPredicate.test(event)}") public void handle(FooEvent event) { ...

Determine if an event has been attached to yet

由 ◇◆丶佛笑我妖孽 提交于 2019-12-01 02:25:27
问题 I have two objects - one that contains some code with will fire an event, and one that contains the handler for that event. I can't "AddHandler" in the Load of the first object, because an instance of the second object doesn't exist yet. When I raise my event, I want to check to see if a copy of object2 has been instantiated (easy to do), and if a handler has been attached to the event yet (not sure how to do this). I'm also open to another recommendation about how to do this instead. If I do

Modify html output at server side in ASP.NET

由 为君一笑 提交于 2019-12-01 02:03:23
问题 A third-party's webcontrol generates the following code to display itself: <div id="uwg"> <input type="checkbox" /> <div>blah-blah-blah</div> <input type="checkbox" /> </div> Is it possible to change it to <div id="uwg"> <input type="checkbox" disabled checked /> <div>blah-blah-blah</div> <input type="checkbox" disabled checked /> </div> When we click on <asp:CheckBox id="chk_CheckAll" runat="server" AutoPostBack="true" /> located on the same page? We need to do it at server side (in ASP.NET)

TFS 2013 event handling on work item change

由 感情迁移 提交于 2019-12-01 01:53:45
I would like to develop software which runs every time a work item is being created or changed in a TFS team collection. My TFS server version is 2013 and i'm planning to upgrade soon to 2015. I tried the following article but it doesn't work on 2013... What do you recommend? Found the answer! here's my code: using Microsoft.TeamFoundation.Common; using Microsoft.TeamFoundation.Framework.Server; using Microsoft.TeamFoundation.WorkItemTracking.Server; using System; using System.Collections.Generic; using System.Diagnostics; using System.Linq; using System.Text; using System.Threading.Tasks;
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