C# when does a using statement end and clean-up

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This is not a problem just a question about the using statement.
If I have a routine like this.

public static int UpdateSeries(int mazeSeriesID)
		{
			Gbl.z_MethodMain = "(Common)UpdateShows";

			using SqliteDBContext dbContext = new();

have some code which updates or creates sqlite records then executes a save changes block as follows.

}

public static bool SaveEntityChanges(string label = "")
		{
			Gbl.z_MethodMain = "(Common)SaveEntityChanges";
			bool result = true;

			try
			{
				DbContext.SaveChanges();
			} catch(Exception ex)
			{
				Utils.WriteLog(
					Gbl.z_MsgLogName,
					1,
					"Error occurred while Saving Changes to Database - Exception= " + ex.Message,
					Gbl.z_MethodMain,
					label);
				result = false;
			}
			return result;
		}

Does the using statement persist over the executed save changes routine?
Does it persist over other routines executed from within the block?
Will the using only end on a return?
What is the difference if I put all the code within braces?

I am new to this all the doco does not make it clear.

What I have tried:

I have currently only tried doing this within a block.

Posted 6-Jan-24 21:27pm

Leonard Salamacha 2023

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3 solutions

Solution 1

See using statement - ensure the correct use of disposable objects - C# | Microsoft Learn[^].

Posted 6-Jan-24 22:12pm

Richard MacCutchan

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OriginalGriff · Accepted Answer · 2024-01-06T22:45:00

There are two different forms of using^*
The using statement which requires parentheses:

C#

using (MyClass mc = new MyClass())
   {
   // mc in scope here
   ...
   }
// mc no longer in scope

The system will automatically call Dispose for the variable when the block of code is exited in any way: fall through, exception, break, continue, throw, or return.

The using declaration:

C#

   {
   ...
   using MyClass mc = new MyClass();
   // mc in scope here
   ...
   }
// mc out of scope here

The variable will be Disposed when the code exits the scope in which the variable is declared (he enclosing curly brackets, usually) in the same way as for the using statement.

* Well, three - there is also the using directive which appear at the top of the file and creates aliases.

M Imran Ansari · Accepted Answer · 2024-01-07T09:00:00

Solution 3

See for some good understanding with examples C# Using (How It Works For Developers) | IronPDF[^]

Posted 7-Jan-24 9:00am

M Imran Ansari

Comments

Graeme_Grant 7-Jan-24 19:56pm

This answer appears to be commercial and spam in nature.

M Imran Ansari 8-Jan-24 4:51am

How?

M Imran Ansari 8-Jan-24 4:54am

We only concern about the article contents instead of any other services. I don't think If the contents are self explanatory with good examples we shouldn't consider it.