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What's the hardest or most misunderstood aspect of LINQ? [closed]
...string> { "Bob", "Alice", "Trent" };
var results = from s in items select s;
Console.WriteLine("Before add:");
foreach (var result in results)
{
Console.WriteLine(result);
}
items.Add("Mallory");
//
// Enumerating the results again will return the new ...
Difference between “!==” and “==!” [closed]
...
false because "a" is not equals to !" " !" " means cast to bool and negate that so " " is true and !" " is false.
– Zaffy
Sep 8 '12 at 13:07
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Entity Framework: There is already an open DataReader associated with this Command
...al commands executed on single connection (or single command with multiple selects) while next DataReader is executed before first one has completed the reading. The only way to avoid the exception is to allow multiple nested DataReaders = turn on MultipleActiveResultSets. Another scenario when this...
Why is UnhandledExceptionEventArgs.ExceptionObject an object and not an Exception?
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So casting it to Exception in C# will not be a problem? right?
– Mubashar
Nov 28 '13 at 0:34
1
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Explanation of JSONB introduced by PostgreSQL
...h a stable release, there will be two major use cases, when you can easily select between them:
If you only work with the JSON representation in your application, PostgreSQL is only used to store & retrieve this representation, you should use json.
If you do a lot of operations on the JSON val...
DateTime format to SQL format using C#
...ther seldom used format, which is a bit weird but works for all versions:
select { d '2013-10-01' }
will return the first of october 2013.
select { ts '2013-10-01 13:45:01' }
will return october 1st, 1:45:01 PM
I strongly advice to use parameters and never format your own SQL code by pasting...
Difference between new and override
...y.
When you hide a method, you can still access the original method by up casting to the base class. This is useful in some scenarios, but dangerous.
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How do I update a Linq to SQL dbml file?
... was getting 'Specified cast is not valid' errors when performing a simple select on a view. Including 1b fixed it for me
– tomfumb
Nov 29 '11 at 19:40
6
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Polymorphism: Why use “List list = new ArrayList” instead of “ArrayList list = new ArrayList”? [dupl
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Whose methods are available by this casting? list or arraylist?
– Zahan Safallwa
Feb 27 '16 at 13:58
1
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How do I convert uint to int in C#?
...int is greater than int.MaxValue you'll get a negative result if you use a cast, or an exception if you use Convert.ToInt32.
– LukeH
Jul 15 '09 at 14:52
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