clear | 易学教程

Clearing a drop down list in C#

阅读更多关于 Clearing a drop down list in C#

问题 I truly do hate to ask such a crayon-question... I'm trying to clear, not remove a drop down combo list in VSC#. My ddl lets the user choose the payRate of an employee. I've researched everywhere, even here, and everything suggests using.. cmboPayRate.Items.Clear(); .. or cmboPayRate.SelectedIndex = - 1; I even threw in cmboPayRate.SelectedItem = -1; for safe measure. Nothing working. Again, I know this is easy(should be), but not working for me. Any suggestions would be greatly appreciated.

extra vertical space in IE after div clear

阅读更多关于 extra vertical space in IE after div clear

I have created a simple grid of divs by left floating them and an empty div with a clear at the end of each row. This works fine in Firefox, but in IE I get extra vertical space between rows. I tried to apply the "clearfix" method, but I must be doing something wrong. Why does IE insert the extra vertical space and how can I get rid of it? <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <style> root { display: block; } body { background: white; } .colorChip { position:relative;

How to empty or clear heap memory dynamically in my code

阅读更多关于 How to empty or clear heap memory dynamically in my code

In my application i am using simple gallery and the coverflow both i have my coverflow image gallery on image clicked in coverflow i am redirected to next activity that contents full screen gallery and i can even scroll my fullscreen gallery ; but when i put more amount of image or high resolution images in my app it get force closed due to Bitmap size exceeds VM budget so i want to clear heap memory every time i finish my cover flow and gallery so i can load any amount or any resolution image in my app so if any one can help me out ... How to clear/empty heap memory every time when i finish

How to clear the backbone localstorage

阅读更多关于 How to clear the backbone localstorage

问题 The javascript one seems pretty simple, just localStorage.clear(). Is there anything similar to that for the backbone localstorage, and if not, can someone point me in the right direction on how to do it. I was thinking about doing something like this: localStorage.each(localStorage.delete(this)) except this wouldn't point to that element would it? 回答1: Few ways you can do this from the Collection, but whichever way you choose, you have to call destroy on each model, which will run sync and

Why is there no list.clear() method in python?

阅读更多关于 Why is there no list.clear() method in python?

Inspired by this question. Why is there no list.clear() method in python? I've found several questions here that say the correct way to do it is one of the following, but no one has said why there isn't just a method for it. del lst[:] lst[:] = [] While it may go against the "zen of python" to have more than one way of doing something, it certainly seems more obvious to me to have a "list.clear()" method. It would also fall in line with dicts and sets, both of which have .clear(). I came across a few posts to the python-dev and python-ideas concerning this and didn't come to a definitive

Why FD_SET/FD_ZERO for select() inside of loop?

阅读更多关于 Why FD_SET/FD_ZERO for select() inside of loop?

问题 I am using the select function for communication between my sockets. I have a while loop and I do - while(!done) { FD_ZERO(&read_flags); FD_ZERO(&write_flags); FD_SET(comm_fd1, &read_flags); FD_SET(comm_fd2, &read_flags); FD_SET(STDIN_FILENO, &read_flags); FD_SET(comm_fd1, &write_flags); FD_SET(comm_fd2, &write_flags); FD_SET(STDIN_FILENO, &write_flags); //call select sel = select(comm_fd1+comm_fd2+1, &read_flags, &write_flags, (fd_set*)0, &waitd); and the same with different variables on the

How to remove the variable “clear” in MATLAB

阅读更多关于 How to remove the variable “clear” in MATLAB

问题 Let's say you are some new programmer and you do something like... %...la da da %...programming away if such && such clear = 1; else clear = 0; end or in some other way, you assign the variable clear a value. Is there some way to "clear" clear ? clearvars doesn't work. Clicking the workspace variable and manually clicking delete does work, but I think it's cheating. 回答1: This will do it: builtin('clear','clear') Note: Keep in mind to avoid such operations to keep code clarity. Only do

Android: how to clear app cache and keep user data via adb?

阅读更多关于 Android: how to clear app cache and keep user data via adb?

I'm running some automated tests (with calabash-android) on an Android app and I need to programatically trigger a clear of the app's cache, but not user data. I found that the adb shell pm clear solution is not adequate, since it clears user data (which includes login details). Is there any way to achieve this externally to the app (i.e. without code changes)? I've been exploring the /data/data/<app's package> folder, and found a cache folder inside, which contained the cached files for the app that I wanted to clear the cache of. Then from adb shell I deleted the contents, and the app's

C++ fastest way to clear or erase a vector

阅读更多关于 C++ fastest way to clear or erase a vector

I have a code where I routinely fill a vector with between 0 and 5000 elements. I know the maximum never exceeds 5000. Instead of initializing vector multiple times, I would like to do just once vector<struct> myvector; myvector.reserve(5000); However, to fill the vector again, I have to clear the vector first without altering its capacity. So usually I call myvector.clear(); This is a O(n) operation. Is there something simple I can do to increase the performance of this or is this about the best that it will get? If your struct has a non-trivial destructor, then that needs to be called for

VB.NET: Clear DataGridView

阅读更多关于 VB.NET: Clear DataGridView

I've tried - DataGridView1.DataSource=Nothing and DataGridView1.DataSource=Nothing DataGridView1.Refresh() and DataGridView1.RefreshEdit() None of them works.. I've written a method that sets the DataSource of the DataGridView when executed. but each time i execute it, it replicates the data with new value and appends it to the previous contents of the DGV.. I wanna clear the content and then add the values.. Is that possible? If the DataGridView is bound to any datasource, you'll have to set the DataGridView's DataSource property to Nothing . If the DataGridView is not bound to any data