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The Throw statement throws an exception that you can handle with structured exception-handling code (nally) or unstructured exception-handling code (On Error goto). You can use the Throw statement to trap errors risk within your code because visual Basic moves up the call stack until it finds the appropriate exception-handling code. A throw statement with no expression can only be used in a catch statement, in which case the statement rethrows the exception currently being handled by the catch statement. The Throw statement resets the call stack for the expression exception. If expression is not provided, the call stack is left unchanged. You can access the call stack for the exception through the. Example, the following code uses the Throw statement to throw an exception: ' throws a new exception. Exception An exception has occurred. Requirements, namespace: sualBasic, module: Interaction, assembly: Visual Basic Runtime library (in sualBasic. See also nally Statement, on Error Statement.

Diagnostics ' imports reading. Tasks ' this Click event is marked with the Async modifier. Private Async Sub startButton_Click(sender As Object, e as routedEventArgs) Handles ick Await dosomethingAsync End Sub Private Async Function analysis dosomethingAsync As Task dim delaytask As Task(Of Integer) delayAsync dim result As Integer Await delaytask ' the previous two statements may be combined into ' the following. ' dim result As Integer Await DelayAsync debug. WriteLine result: " result) End Function Private Async Function DelayAsync As Task(Of Integer) Await lay(100) Return 5 End Function ' output: ' result: 5 see also Implements Statement Function Statement Parameter List Dim Statement Call Statement Of Parameter Arrays How to: Use a generic Class. Contributors, throws an exception within a procedure. Syntax, throw expression, part expression, provides information about the exception to be thrown. Optional when residing in a catch statement, otherwise required.

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Exit Sub End If ' calculate area of rectangle. Area length * width ' print area to Immediate window. WriteLine(area) End Sub Example In the following hibernation example, delayAsync is an Async Function that has a return type of Task tresult. DelayAsync has a return statement that returns an integer. Therefore, the function party declaration of DelayAsync must have a return type of Task(Of Integer). Because the return type is Task(Of Integer the evaluation of the Await expression in dosomethingAsync produces an integer, as the following statement shows: Dim result As Integer Await delaytask. The startButton_Click procedure is an example of an Async Sub procedure. Because dosomethingAsync is an Async function, the task for the call to dosomethingAsync must be awaited, as the following statement shows: Await dosomethingAsync. The startButton_Click sub procedure must be defined with the Async modifier because it has an Await expression.

An Async function can have a return type of Task tresult or Task. An example later in this topic shows an Async function that has a return type of Task tresult. Async Sub procedures are primarily used for event handlers, where a value can't be returned. An Async Sub procedure can't be awaited, and the caller of an Async Sub procedure can't catch exceptions that the sub procedure throws. An Async procedure can't declare any byref parameters. For more information about Async procedures, see asynchronous Programming with Async and Await, control Flow in Async Programs, and Async Return Types. Example The following example uses the sub statement to define the name, parameters, and code that form the body of a sub procedure. Sub computeArea(byval length As double, byval width As double) ' declare local variable. Dim area as double If length 0 Or width 0 Then ' if either argument 0 then exit Sub immediately.

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Therefore, you can't use a sub procedure in an expression. You can use the call keyword when you call a sub procedure, but that keyword isn't fahrenheit recommended for most uses. For more information, see call Statement. Visual Basic sometimes rearranges arithmetic expressions to increase internal efficiency. For that reason, if your argument list includes expressions that call other procedures, you shouldn't assume that those expressions will be reporting called in a particular order. Async Sub Procedures by using the Async feature, you can invoke asynchronous functions without using explicit callbacks or manually splitting your code across multiple functions or lambda expressions.

If you mark a procedure with the Async modifier, you can use the Await operator in the procedure. When control reaches an Await expression in the Async procedure, control returns to the caller, and progress in the procedure is suspended until the awaited task completes. When the task is complete, execution can resume in the procedure. Note An Async procedure returns to the caller when either the first awaited object thats not yet complete is encountered or the end of the Async procedure is reached, whichever occurs first. You can also mark a function Statement with the Async modifier.

Sub procedures default to public access. You can adjust their access levels by using the access modifiers. If the procedure uses the Implements keyword, the containing class or structure must have an Implements statement that immediately follows its Class or Structure statement. The Implements statement must include each interface that's specified in implementslist. However, the name by which an interface defines the sub (in definedname) doesn't have to match the name of this procedure (in name).


Returning from a sub Procedure When a sub procedure returns to the calling code, execution continues with the statement after the statement that called. The following example shows a return from a sub procedure. Sub mySub(byval q As String) Return End Sub The Exit Sub and Return statements cause an immediate exit from a sub procedure. Any number of Exit Sub and Return statements can appear anywhere in the procedure, and you can mix Exit Sub and Return statements. Calling a sub Procedure you call a sub procedure by using the procedure name in a statement and then following that name with its argument list in parentheses. You can omit the parentheses only if you don't supply any arguments. However, your code is more readable if you always include the parentheses. A sub procedure and a function procedure can have parameters and perform a series of statements. However, a function procedure returns a value, and a sub procedure doesn't.

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Name of the event this procedure handles. Block of statements to run within this procedure. End Sub Terminates the definition of this procedure. All executable code must be inside a procedure. Use a sub procedure when you don't want to return a value to the calling code. Use a function procedure when you want to return a value. Defining a sub Procedure you can define a sub procedure only at the module level. The declaration context for a sub procedure must, therefore, be a class, a structure, a module, or an interface and literature can't be a source file, a namespace, a procedure, or a block. For more information, see declaration Contexts and Default Access levels.

visual statement

Indicates that this procedure can handle one or more specific events. Eventlist Required if Handles is supplied. List of events this procedure handles. each eventspecifier has the following syntax and parts: eventvariable. Event Part Description eventvariable required. Object variable declared with the data type of the class or structure that raises the event.

To spondylolisthesis create a constructor procedure for a class, set the name of a sub procedure to the new keyword. For more information, see. Object Lifetime: How Objects Are Created and Destroyed. List of type parameters for a generic procedure. List of local variable names representing the parameters of this procedure. Indicates that this procedure implements one or more sub procedures, each one defined in an interface implemented by this procedure's containing class or structure. Implementslist Required if Implements is supplied.

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Contributors, declares the name, parameters, and code that define a sub procedure. Syntax attributelist partial accessmodifier proceduremodifiers shared shadows async. Sub name (Of typeparamlist) (parameterlist) implements implementslist writers handles eventlist statements exit Sub statements. End Sub, parts attributelist, optional. Indicates definition of a partial method. Can be one of the following: see, access levels in Visual Basic. Can be one of the following: Shared, optional. Name of the procedure.


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  1. Sql-select statement to add versatility to this statement. The, visual Resources Association, foundation (vraf) is pleased to announce that it is accepting host applications for the vraf regional Workshop Program for. Ilr calendar and agenda.

  2. All; In this article. Declares the name, parameters, and code that define a sub procedure. Apr 16, 2018 describes how to use wildcard characters in the.

  3. Our new feedback system is built on GitHub Issues. Read about this change in our blog post. Sub Statement (Visual Basic ) ; 6 minutes to read Contributors.

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