Nested using statements
Like this: Using a As New Thingy(), _ b As New OtherThingy() … End Using
using-statement
EF (entity framework) usage of “using” statement
I think you will find many suggesting this style of pattern. Not just me or Henk DBContext handling Yes, Ideally Using statements for DBContext subtypes Even better Unit Of Work patterns that are managed with Using, that have a context and dispose the context Just 1 of many UoW examples, this one from Tom Dykstra … Read more
Why can’t I reference System.Runtime.Serialization.Json in C#
The System.Runtime.Serialization.Json Namespace is in two different DLL’s depending on your .net framework. In .NET 3.5 It is in System.ServiceModel.Web.dll In .NET 4.0 and above It is in System.Runtime.Serialization.dll. Make sure you have added the correct DLL as a reference in your project and add using System.Runtime.Serialization.Json; to the top of your code file. EDIT … Read more
When is “using” block used for in C#? How to use “using” block in C#?
Because it also implements IDisposable. The purpose of Using statement is that when control will reach end of using it will dispose that object of using block and free up memory. its purpose is not only for auto connection close, basically it will dispose connection object and obviously connection also closed due to it. Its … Read more
Does “using” statement always dispose the object?
Yes, that’s the whole point. It compiles down to: SomeDisposableType obj = new SomeDisposableType(); try { // use obj } finally { if (obj != null) ((IDisposable)obj).Dispose(); } Be careful about your terminology here; the object itself is not deallocated. The Dispose() method is called and, typically, unmanaged resources are released.
Where do I put try/catch with “using” statement? [duplicate]
If your catch statement needs to access the variable declared in a using statement, then inside is your only option. If your catch statement needs the object referenced in the using before it is disposed, then inside is your only option. If your catch statement takes an action of unknown duration, like displaying a message … Read more
Dealing with .NET IDisposable objects
FxCop might help (although it didn’t spot a test I just fired at it); but yes: you are meant to check. IDisposable is simply such an important part of the system that you need to get into this habit. Using intellisense to look for .D is a good start (though not perfect). However, it doesn’t … Read more
What scope does a using statement have without curly braces
Beginning with C# 8.0, the using keyword can be used as an attribute in the variable declarations of disposable objects (Reference). The semantics is as you would expect — the objects are auto-disposed at the end of the scope. public class Disposable : IDisposable { string name; public Disposable(string name) { this.name = name; } … Read more
MemoryStream in Using Statement – Do I need to call close()
No, it’s not. using ensures that Dispose() will be called, which in turn calls the Close() method. You can assume that all kinds of Streams are getting closed by the using statement. From MSDN: When you use an object that accesses unmanaged resources, such as a StreamWriter, a good practice is to create the instance … Read more
C# conditional using block statement
One option, which is somewhat nasty but would work, based on the fact that the C# compiler calls Dispose only if the resource is non-null: protected void ValidateExportDirectoryExists() { using (useNetworkAccess ? new Core.NetworkAccess(username, password, domain) : null) { CheckExportDirectoryExists(); } } Another alternative would be to write a static method which returned either null … Read more