c# - LinqToSql returns null when using Single - not sequence contains no elements -

-

संभव डुप्लिकेट:

मैंने इसे बदलने की कोशिश की। SINGLEOrDefault के बजाय सिंगल और वस्तु जो मैं वापस आती हूं वह शून्य है, 'अनुक्रम में कोई तत्व नहीं' त्रुटि होती है जब मैं एसक्यूएल प्रोफ़ाइलर का उपयोग करता हूं और उत्पन्न एसक्यूएल को कैप्चर करता हूं, तो मैं क्वेरी चलाता हूं और 1 परिणाम मिलता है। ऑब्जेक्ट रिक्त होने के कारण क्या होगा?

किसी भी मदद के लिए धन्यवाद, ~ ck

< P> शायद आपका फ़ील्ड / गुण मानचित्रण आपके डीबीएमएल में सही नहीं है


Comments

Post a Comment

Popular posts from this blog

MySql variables and php -

-
I am getting an error with php in order to format mysql_query () in php to format this string What is the right way? SELECT SELECT SELECT (*) Agents @AgentCount; User_Agent_English, User_Angent_Oursal, US.___Gent_Aginal, COUNT (User_Agent_Percade) ACC, COUNT (*) / (AgentCount) Percentage by agents user_agent_preser order DEC limit limit 50; In PHP, how am i setting $ query $ query = "SELECT count (*) agents @ agentcount; SELECT user_agent_parsed, User_agent_original , COUNT (user_agent_parsed) ascount, COUNT (*) / (@AgentCount) as a percentage by user_agent_parced by URI date DESC limit 50 "; This exact query will work properly if I put it in MySQL directly through a command line session. Do I need to release two separate php calls from mysql_query () and store the results first? I get the following error: There is an error in your SQL syntax; Instead of using a sub-selection and instead of using the 'SELECT user_agent_parsed, user_agent_original, ne...
Read more

ios - Form Sheet content disappearing -

-
Image
I am trying to apply a form sheet. Looks like this on the storyboard: App background only when I run Appears and everything else is hidden. I am presenting a form sheet using model sheets - I am working with the form sheet and I (WREGLR Regular) size. Why is this happening?
Read more

php - Laravel - Overriding a resource route into a different route filter group -

-
Does Laravel's routing work as expected? What I think, if I want to override a route, then I just have to give the expected route before each other. I have something like this: root :: group (array ('first' = & gt; 'defaultLoads' =); function () {root :: post 'Newsletter', 'newsletter controller @ store'); root: group (array ('(newsletter', 'newsletter controller');}}); That if I post this route, only http://domain.com/newsletter should run only the default loads route filter. However, when I call php Runs artisan routes , I get this: | | POST newsletter | newsletter.store | newslettercontroller@ store | default loads | login | | though it reads the route correctly (PHP artisan loads which The correct path is to the right place) but the file of the resource path even if it is not in the filter group, the path is affected. Then my question: How does it work Laravel? If so, do I post this -> Newsle...
Read more