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Close a form today and report an error like "You cannot call invoke or BeginInvoke on a control until the window handle is created." "This doesn't have to be a lot of thinking, it must be that place is not released."Since we have encountered this problem, we should not say the problem itself, but say something else.WinForm most common is the DataGridView this control, regardless of rewriting or how, a lot of data operation is to use DataGridView to sh

There are three ways to create Uiviewcontrller:1. Created directly via Alloc init.2. Create from the story version.3. Through the Xib file description.This is APPDELEGATE.M's content. //The color of window is greenSelf.window =[[UIWindow Alloc]initwithframe:[uiscreen mainscreen].bounds]; Self.window.backgroundColor=[Uicolor Greencolor]; /** First: Directly alloc init to create a controller, the controller will automatically create a view, there is no

I have created a Cookie in a function, but can I not recognize it in another function? I created a Cookie in function a, but I did not recognize it in function B. later, I created another Cookie with the same name in function B, the browser found two cookies with the same name! Shouldn't Cookei be unique? How can there be two? My function B only recognizes the co

Countdownlatch (1); Public Holdthread () { This.setdaemon (TRUE); } public void Run () { try { Cdl.await (); } catch (Interruptedexception e) { } } } Without specifying any JVM parameters, run the output directly in eclipse and see this friend:i = 5602Exception in thread "main" java.lang.OutOfMemoryError:unable to create new native threadAt Java.lang.Thread.start0 (Native Method)At Java.lang.Thread.start (thread.java:597)At Testnativeoutofmemoryerror.main (testnativeo

Does anyone know how many tables can be created in the mysql database? My company is now building a blog that supports second-level domain names in Japanese. I checked it online and found that the wordpressmu system can meet the requirements. In addition, I still use the Japanese language pack in wordpress, but I can barely use it, the problem is that the company wants to build hundreds of thousands of blogs, and the database design of this system is

Write code when you touch android.view.viewrootimpl$calledfromwrongthreadexception:only the original thread that created a view Hierarchy can touch its views. This exception.The exception means that only the thread that created the view can manipulate the view, and it is common to assume that the view is created in a non-UI thread before this error occurs.But thi

1. Create two external files in 1.txt and 2.txt with only one data. 2. Create a logical directory and perform proper authorization: SQL> create directory ztj1_dir as 'C: \ ztj1 \'; Directory created Then, manually create the actual directory in the physical path, for example, create the ztj directory folder under drive c. SQL> grant read on directory ztj1_dir to scott Authorization successful SQL> grant write on directory ztj1_dir to scott Authorizati

How can we determine whether a cookie has expired or has not been created? now we want to integrate it with a third-party system and share it with cookies! Cancel synchronization now! That is, our system determines the status of the cookie value of a third-party system to execute a certain statement! If the cookie is set to expire, statement 1 is executed. If no cookie is created, statement 2 is executed! I

I have created a Cookie in a function, but can I not recognize it in another function? I created a Cookie in function a, but I did not recognize it in function B. later, I created another Cookie with the same name in function B, the browser found two cookies with the same name! Shouldn't Cookei be unique? How can there be two? My function B only recognizes it. I

We know that creating an index for a table can accelerate the query speed of the table and enhance the uniqueness of the table's columns. We also know that adding a primary key to a table can automatically create a clustered index on the primary key column, or adding a unique constraint to a table will automatically add a unique cable. Indexes created using the primary key and unique constraint cannot be deleted using the drop index. See the following

How Java object objects are created [reproduced]@author http://blog.csdn.net/mhmyqn/article/details/7943411Explicitly create an There are 4 ways to explicitly create an object:1. Constructor : Create an object with the new statement, which is the most common way to create an object.2. Reflection : Using the Reflection method, call the Java.lang.Class or Java.lang.reflect.Constructor class newinstance () instance methods.3. Clone : Invokes the ob

Quirky 8.2 has been released as a sister project for Puppy Linux and is a Linux distribution created with a custom tool called Woof.The new version, Quirky 8.2, runs on a 64-bit x86 computer and provides incremental improvements to the previous 8.x version.The code for the Quirky Linux 8.2 x86_64 is ' Xerus ', built using Ubuntu 16.04.2 binary packages, so Xerus is compatible with all Ubuntu repositories.650) this.width=650; "src=" Http://www.linuxpro

Iis6 cannot run the php script after the website is manually created, iis6php I have moved more than a dozen websites, and the old site was created by the digital site building Assistant of the western region. Now it has expired and cannot be created any more. I can only create a website in the Internet Information Service (IIS) manager. It is no problem to crea

Create | index Q: I found that many of the entries in the sysindexes Index table were not created by myself. It is said that they are not real indexes, but statistics created automatically by the SQL Server query optimizer. How do you identify which are true indexes and which statistics are created automatically by SQL Server? A: By default, if a column in a tabl

The process default heap and the additional heap created are mentioned in chapter 18th, "Heap" in the fifth edition of Windows core programming. This is a very important knowledge in programming, to be organized today.1, heaps are ideal for allocating large amounts of small data . Using heaps allows programmers to focus on the problem at hand, regardless of the allocation granularity and page boundaries. So the heap is the best way to manage the list

You can refer to the article "C # for thread-safe invocation of Windows forms controls."There is a problem with the network connection program: Whenever a connection arrives, a new receive thread is created, and when the receive thread receives the message, it can create a new conversation window that cannot block the receipt of the next round of messages for that receiving thread. And the receiving thread is also going to display the received message

Eclipse Imports Additional files in the created projectI was asked by my colleague two days ago how to import files from other directories in a project that was previously created without copying the source files.Tidy up a little bit to summarize the current knowledge of the Eclipse File Import method:1. directly import the project you have createdthrough Eclipse directly Import, existing project2. Create a

When you back up a customer's database (the database version is SQL 2005 Express version), the DBCC CHECKDB encountered the following error message:DBCC CHECKDB (' db_name ');MSG 5030, Level 16, State 12, line 1thThe database could not being exclusively locked to perform the operation.Msg 7926, Level 16, State 1, line 1thCheck statement aborted. The database could not being checked as a database snapshot could not being created and the database or tab

is Providername= "System.Data.SqlClient"You can change it? Too naïve!Issue two, DbContext generates an exception:After the change to run, found or will be errorThe model backing the ' productcontext ' context has changed since, the database was created.Consider using Code first migrations to update the database (http://go.microsoft.com/fwlink/?LinkId=238269).Check the information on the Internet:For those who is seeing this exception:"The model backing the ' Production ' context has changed sin

Model: 1. Change the model file name and the class name to the corresponding table name _ model2, and change $ this-> table_name = 'table name' in the constructor '; the table names mentioned here are all modules: 1, which removes the phpcmsv9 table name prefix, and changes the module folder name to its own English name. Generally, the table name is the same as the "Install" folder: 2, change the file name under ages/ZH-CN to the module name. lang. PHP can delete this file and the ages folder on