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In EF programming, we sometimes encounter such an error: However, follow the prompt "see 'entityvalidationerrors 'property for more details." To view the exception, you can only see It cannot be seen why the property verification fails. This may be the case for many people. Here we will introduce an exception class, so that we can easily know which field has a problem. That is system. Data. entity.

Before using ASIO, you must first understand its design ideas. Understanding the design ideas will help us understand and apply ASIO. ASIO is based on the proactor mode. The proactor mode of ASIO is hidden in a large number of details. To find its trace, there is often a sense that the tree does not see the forest. The author will analyze the proactor mode in ASIO, it was unveiled step by step, and finally moved to the cloud to restore a complete proa

See for reality (2): Windows window, message, subclass, and superclass This article was intended to introduce the two more "uncommon" terms of class and super class. Windows and messages are discussed for the purpose of describing integrity, and processes and threads are also briefly discussed. Subclassing and superclassing are two methods to reuse code generated by the Windows window mechanism. Do not confuse subclass and superclass with the derived

user experience, it's too difficult to get started (maybe it's always a pain point for internationalization ?). Cnzz should be said that the user experience has been well done. After all, users have become very accustomed to polishing and nurturing these years. However, I can give an example to find that cnzz still does not have a bit of detail, such as real-time traffic statistics. Many webmasters like to stare at this. From the statistics, cnzz is similar to Baidu statistics (

Treat them well: When I see migrant workers of the same age as my father Http://cul.sina.com.cn China Youth Daily Author: Ji Yunmei When I went out with my husband, there was always a scooter migrant workers greeting me. The husband said these people still remember you. Yes, not only do they remember me, but I also remember them. With the greeting of a few days, the impression on them will

Problem: the number of columns is filtered out as few as possible so that we can see from left to right. These numbers are from small to large and then from large to small (Netease ). Solution:This is a dual-end Lis problem. It can be solved using the DP idea. The objective planning function max {B [I] + C [I]}, where B [I] is left to right, 0 ~ The number of I numbers must increase progressively. C [I] is from right to left, n-1 ~ The number of I num

See impressionrank In the PageRank Era [Google algorithm] No matter if PageRank does not exit the historical stage, pagrank cannot accurately measure the value of a page (website). This is a fact, but the function of PageRank is lost, it not only makes link transactions lose a major benchmark, but also makes some webmasters lose their "spiritual sustenance ". In fact, there are many other ways to measure the value of a website, such as the search eng

practical technique: with the same power, the thorn is more fatal than the cut, and the slashes are stabbed to death. You will see this technique in many occasions. For example, in the movie "Lord of the Rings", you will find that the orcs take a big knife and humans use a long sword. At the beginning, both sides shouted with weapons and rushed to the enemy. But in the next war, the orcs were still cutting down, and humans tried to block them with sw

life in a hurry for decades, said short also short, said long also long, seemingly extravagant youth, but he is in your inadvertently quietly passing, so time is still expensive in their own, see how to spend, how to choose, no one can around your life, the only thing you do is your own heart yearning for that piece of heaven and earth!Haven't been here for a long time, have not left their footprints, every day is in a hurry, in a few months after I w

WPF has been in our life for many years. (It reminds me of this sentence: "I have never been a big brother for many years. " .) I personally think that in the UI In practice, what users need is an easy-to-operate and more elegant interface. These two should be the most basic and important purposes. Developers should use the simplest method to develop as beautiful interfaces as possible, and the efficiency should not be too bad. (Is the requirement too much !) Besides In web development and

People who want to write this code when they see the program. PHP Code if ($server > 0) {if (empty ($dblist)) {$dbs = Mysql_list_dbs (); $num _dbs = mysql_numrows ($dbs); } else {$num _dbs = count ($dblist); } for ($i =0; $i "Onclick=" ExpandIT (' El '); return false; " > Img "> db= "Onclick=" ExpandIT (' El ');" > Child "class=" > db= table= sql_query= pos=0goto=tbl_properties.ph

Sometimes, in unity scenes, objects suddenly disappear, you can do this: first, in the Hierarchy panel select Invisible Objects, press the shortcut key F. If the object is still invisible, see: Look at the place where the circle is red in the picture. If the object is to be seen, the icon needs to be the "eye" pattern.Click on the mouse, if the icon is already "eye" pattern, the scene still can not see obje

Reveal this powerful interface debugging tool. The ability to view and change the properties of a view in real time, largely implements what the iOS program ape has dreamed of. For example, sometimes we join a view, but the view is not shown, this time reveal, very easy to find this view, it may be obscured, it may be accidentally placed in the outside of Superview. And so on, convenient very.It was very early to know that reveal could be used to view other apps ' interfaces, but never tried. To

1, under the Linux system, restart Tomcat to use the command to operate!Method One:First, go to the bin directory under TomcatCd/usr/local/tomcat/binUsing the Tomcat Close command./shutdown.shTo see if Tomcat is shutting downPs-ef|grep JavaIf the following similar information is displayed, Tomcat is not turned offRoot 7010 1 0 Apr19? 00:30:13/usr/local/java/bin/java-djava.util.logging.config.file=/usr/local/tomcat/conf/logging.propert

Because Linux installs a lot of software, there is no common way to find out if some software is installed. This is a summary of the following categories:1, RPM package installed, you can see with RPM-QA, if you want to find a package is installed, with Rpm-qa | grep "The name of the software or package".Rpm-qa | grep Ruby2, with the Deb package installed, can be seen with dpkg-l. If you are looking for a specified package, use Dpkg-l | grep "The name

1. View Port usage:1. Start-run--cmd to enter the command prompt.2. Enter Netstat-ano (or Netstat-nao) to See all processes (the PID of the process shown here) occupy the port. 3. In Task Manager, locate the process for this PID, and if there is no PID in Task Manager, you can select "View"-"Choose Column" in Task Manager.2. See which processes occupy a port:1. Start-run--cmd to enter the command prompt.2.

1. Open PowerPoint 2010, click on the Slide Show tab and there is a "Use Presenter view" option in the Monitor Options group, which works by projecting full-screen slides onto a large screen, and my computer sees not only the slides but also the notes and timing information; 2. Click "Use Presenter View", a warning message appears, which actually tells us that the current computer detects only one monitor, and that we have to "use Presenter view" with two or more monitors, Please ve

WIN8 system can not use QQ browser to see the video how to do Solving method 1, in fact, for the network of the Great God, Flash plug-in is everyone knows the network support Plug-ins, if you understand the flash of the great God can skip this one; 2, first of all, the Flash plug-in is divided into IE kernel and non ie kernel, such as Firefox, Google is not ie kernel, to download non ie kernel flash plug-ins, such as QQ browser, Cheetah browser, et

How do I see if anyone has a WiFi? According to the survey, as users of the first access to the Internet, wireless routers are also being used by hackers to attack, threats to users of Internet and privacy security tools, 70% of users worry about the security of the router. Next, let's look at how to prevent others from rubbing the net. Check to see if anyone is rubbing the WiFi method 1, first of all,

Today, after configuring Linux server FTP, login is normal, using the FTP tool after logging in, all directories can be manually write path access, but the folder and file list do not see the data. Later analysis, summed up the cause of the result is related to SELinux, so by closing the SELinux after the attempt, the FTP folder and file list are normal to see. Below are 2 diagrams to resolve before and a