I find that if you’re familiar with SQL syntax, using the LINQ query syntax is much clearer, more natural, and makes it easier to spot errors: If you’re really stuck on using lambdas though, your syntax is quite a bit off. Here’s the same query, using the LINQ extension methods:
Absolutely – you basically want: Or as a non-query expression: Basically the contents of the group (when viewed as an IEnumerable<T>) is a sequence of whatever values were in the projection (p.car in this case) present for the given key. For more on how GroupBy works, see my Edulinq post on the topic. (I’ve renamed … Read more
The cleaner way would be to not use .forEach. It’s almost never needed if you’re using TypeScript or a modern version of JavaScript: If the code inside your loop doesn’t have any side-effects and you’re just checking for a condition on each item, you could also use a functional approach with .some:
eah…!!! I found a solution for this terrible error… First of all Thanks for every one who tried to help me… Here’s my solution… Right Click on the Solution name Click Clean Solution Restart Visual Studio Goto project Properties >> Build Change Configuration to Release Start Debugging (F5) 1) , 2) 4) , 5) Next … Read more
The yield contextual keyword actually does quite a lot here. The function returns an object that implements the IEnumerable<object> interface. If a calling function starts foreaching over this object, the function is called again until it “yields”. This is syntactic sugar introduced in C# 2.0. In earlier versions you had to create your own IEnumerable … Read more
There are many ways to wait in Unity. They are really simple but I think it’s worth covering most ways to do it: 1.With a coroutine and WaitForSeconds. The is by far the simplest way. Put all the code that you need to wait for some time in a coroutine function then you can wait … Read more
The lock statement is translated by C# 3.0 to the following: In C# 4.0 this has changed and it is now generated as follows: You can find more info about what Monitor.Enter does here. To quote MSDN: Use Enter to acquire the Monitor on the object passed as the parameter. If another thread has executed … Read more
Check if you are referencing an assembly which in turn referencing an old version of unity. For example let’s say you have an assembly called ServiceLocator.dll which needs an old version of Unity assembly, now when you reference the ServiceLocator you should provide it with the old version of Unity, and that makes the problem. … Read more
This error is a network-related error occurred while establishing a connection to the Server. It means that the error is occurring because there is no server listening at the hostname and port you assigned. It literally means that the machine exists but that it has no services listening on the specified port .
A great C# example of declarative vs. imperative programming is LINQ. With imperative programming, you tell the compiler what you want to happen, step by step. For example, let’s start with this collection, and choose the odd numbers: With imperative programming, we’d step through this, and decide what we want: Here, we’re saying: Create a … Read more