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VB.NET Declaration Statements
VB.NET Declaration StatementsThe supporting VB.NET Declaration Statements are Const, Delegate, Dim, Implements, Imports (.NET Namespace and Type), Imports (XML Namespace), Inherits, Interface, Namespace, ReDim, Event, Private, Public Const StatementDeclares and defines one or more constants. Syntax[ <attributelist> ] [ accessmodifier ] [ Shadows ] Const constantlist Parts
attributelist
accessmodifier
Shadows
constantlist constant [ , constant ... ] Each constant has the following syntax and parts: constantname [ As datatype ] = initializer
RemarksIf you have a value that never changes in your application, you can define a named constant and use it in place of a literal value. A name is easier to remember than a value. You can define the constant just once and use it in many places in your code. If in a later version you need to redefine the value, the Const statement is the only place you need to make a change. You can use Const only at module or procedure level. This means the declaration context for a variable must be a class, structure, module, procedure, or block, and cannot be a source file, namespace, or interface. For more information, see Declaration Contexts and Default Access Levels. Local constants (inside a procedure) default to public access, and you cannot use any access modifiers on them. Class and module member constants (outside any procedure) default to private access, and structure member constants default to public access. You can adjust their access levels with the access modifiers. Rules
Data Type Rules
Behavior
See also
Delegate StatementUsed to declare a delegate. A delegate is a reference type that refers to a Shared method of a type or to an instance method of an object. Any procedure with matching parameter and return types can be used to create an instance of this delegate class. The procedure can then later be invoked by means of the delegate instance. Syntax[ <attrlist> ] [ accessmodifier ] _ [ Shadows ] Delegate [ Sub | Function ] name [( Of typeparamlist )] [([ parameterlist ])] [ As type ] Parts
RemarksThe Delegate statement defines the parameter and return types of a delegate class. Any procedure with matching parameters and return types can be used to create an instance of this delegate class. The procedure can then later be invoked by means of the delegate instance, by calling the delegate's Invoke method. Delegates can be declared at the namespace, module, class, or structure level, but not within a procedure. Each delegate class defines a constructor that is passed the specification of an object method. An argument to a delegate constructor must be a reference to a method, or a lambda expression. To specify a reference to a method, use the following syntax: AddressOf [expression.]methodname The compile-time type of the expression must be the name of a class or an interface that contains a method of the specified name whose signature matches the signature of the delegate class. The methodname can be either a shared method or an instance method. The methodname is not optional, even if you create a delegate for the default method of the class. To specify a lambda expression, use the following syntax: Function ([parm As type, parm2 As type2, ...]) expression The signature of the function must match that of the delegate type. For more information about lambda expressions, see Lambda Expressions. For more information about delegates, see Delegates. See also
Dim StatementDeclares and allocates storage space for one or more variables. Syntax[ <attributelist> ] [ accessmodifier ] [[ Shared ] [ Shadows ] | [ Static ]] [ ReadOnly ] Dim [ WithEvents ] variablelist Parts
Optional. Specifies that these are object variables that refer to instances of a class that can raise events. See WithEvents.
RemarksThe Visual Basic compiler uses the Dim statement to determine the variable's data type and other information, such as what code can access the variable. The following example declares a variable to hold an Integer value.
VB
Dim numberOfStudents As Integer You can specify any data type or the name of an enumeration, structure, class, or interface.
VB
Dim finished As Boolean Dim monitorBox As System.Windows.Forms.Form For a reference type, you use the New keyword to create a new instance of the class or structure that is specified by the data type. If you use New, you do not use an initializer expression. Instead, you supply arguments, if they are required, to the constructor of the class from which you are creating the variable.
VB
Dim bottomLabel As New System.Windows.Forms.Label You can declare a variable in a procedure, block, class, structure, or module. You cannot declare a variable in a source file, namespace, or interface. For more information, see Declaration Contexts and Default Access Levels. A variable that is declared at module level, outside any procedure, is a member variable or field. Member variables are in scope throughout their class, structure, or module. A variable that is declared at procedure level is a local variable. Local variables are in scope only within their procedure or block. The following access modifiers are used to declare variables outside a procedure: Public, Protected, Friend, Protected Friend, and Private. For more information, see Access levels in Visual Basic. The Dim keyword is optional and usually omitted if you specify any of the following modifiers: Public, Protected, Friend, Protected Friend, Private, Shared, Shadows, Static, ReadOnly, or WithEvents.
VB
Public maximumAllowed As Double Protected Friend currentUserName As String Private salary As Decimal Static runningTotal As Integer If Option Explicit is on (the default), the compiler requires a declaration for every variable you use. For more information, see Option Explicit Statement. Specifying an Initial ValueYou can assign a value to a variable when it is created. For a value type, you use an initializer to supply an expression to be assigned to the variable. The expression must evaluate to a constant that can be calculated at compile time.
VB
Dim quantity As Integer = 10 Dim message As String = "Just started" If an initializer is specified and a data type is not specified in an As clause, type inference is used to infer the data type from the initializer. In the following example, both num1 and num2 are strongly typed as integers. In the second declaration, type inference infers the type from the value 3.
VB
' Use explicit typing. Dim num1 As Integer = 3 ' Use local type inference. Dim num2 = 3 Type inference applies at the procedure level. It does not apply outside a procedure in a class, structure, module, or interface. For more information about type inference, see Option Infer Statement and Local Type Inference. For information about what happens when a data type or initializer is not specified, see Default Data Types and Values later in this topic. You can use an object initializer to declare instances of named and anonymous types. The following code creates an instance of a Student class and uses an object initializer to initialize properties.
VB
Dim student1 As New Student With {.First = "Michael",
.Last = "Tucker"}
For more information about object initializers, see How to: Declare an Object by Using an Object Initializer, Object Initializers: Named and Anonymous Types, and Anonymous Types. Declaring Multiple VariablesYou can declare several variables in one declaration statement, specifying the variable name for each one, and following each array name with parentheses. Multiple variables are separated by commas.
VB
Dim lastTime, nextTime, allTimes() As Date If you declare more than one variable with one As clause, you cannot supply an initializer for that group of variables. You can specify different data types for different variables by using a separate As clause for each variable you declare. Each variable takes the data type specified in the first As clause encountered after its variablename part.
VB
Dim a, b, c As Single, x, y As Double, i As Integer ' a, b, and c are all Single; x and y are both Double ArraysYou can declare a variable to hold an array, which can hold multiple values. To specify that a variable holds an array, follow its variablename immediately with parentheses. For more information about arrays, see Arrays. You can specify the lower and upper bound of each dimension of an array. To do this, include a boundslist inside the parentheses. For each dimension, the boundslist specifies the upper bound and optionally the lower bound. The lower bound is always zero, whether you specify it or not. Each index can vary from zero through its upper bound value. The following two statements are equivalent. Each statement declares an array of 21 Integer elements. When you access the array, the index can vary from 0 through 20.
VB
Dim totals(20) As Integer Dim totals(0 To 20) As Integer The following statement declares a two-dimensional array of type Double. The array has 4 rows (3 + 1) of 6 columns (5 + 1) each. Note that an upper bound represents the highest possible value for the index, not the length of the dimension. The length of the dimension is the upper bound plus one.
VB
Dim matrix2(3, 5) As Double An array can have from 1 to 32 dimensions. You can leave all the bounds blank in an array declaration. If you do this, the array has the number of dimensions you specify, but it is uninitialized. It has a value of Nothing until you initialize at least some of its elements. The Dim statement must specify bounds either for all dimensions or for no dimensions.
VB
' Declare an array with blank array bounds. Dim messages() As String ' Initialize the array. ReDim messages(4) If the array has more than one dimension, you must include commas between the parentheses to indicate the number of dimensions.
VB
Dim oneDimension(), twoDimensions(,), threeDimensions(,,) As Byte You can declare a zero-length array by declaring one of the array's dimensions to be -1. A variable that holds a zero-length array does not have the value Nothing. Zero-length arrays are required by certain common language runtime functions. If you try to access such an array, a runtime exception occurs. For more information, see Arrays. You can initialize the values of an array by using an array literal. To do this, surround the initialization values with braces ({}).
VB
Dim longArray() As Long = {0, 1, 2, 3}
For multidimensional arrays, the initialization for each separate dimension is enclosed in braces in the outer dimension. The elements are specified in row-major order.
VB
Dim twoDimensions(,) As Integer = {{0, 1, 2}, {10, 11, 12}}
For more information about array literals, see Arrays. Default Data Types and ValuesThe following table describes the results of various combinations of specifying the data type and initializer in a Dim statement.
If you specify a data type but do not specify an initializer, Visual Basic initializes the variable to the default value for its data type. The following table shows the default initialization values.
Each element of a structure is initialized as if it were a separate variable. If you declare the length of an array but do not initialize its elements, each element is initialized as if it were a separate variable. Static Local Variable LifetimeA Static local variable has a longer lifetime than that of the procedure in which it is declared. The boundaries of the variable's lifetime depend on where the procedure is declared and whether it is Shared.
Attributes and ModifiersYou can apply attributes only to member variables, not to local variables. An attribute contributes information to the assembly's metadata, which is not meaningful for temporary storage such as local variables. At module level, you cannot use the Static modifier to declare member variables. At procedure level, you cannot use Shared, Shadows, ReadOnly, WithEvents, or any access modifiers to declare local variables. You can specify what code can access a variable by supplying an accessmodifier. Class and module member variables (outside any procedure) default to private access, and structure member variables default to public access. You can adjust their access levels with the access modifiers. You cannot use access modifiers on local variables (inside a procedure). You can specify WithEvents only on member variables, not on local variables inside a procedure. If you specify WithEvents, the data type of the variable must be a specific class type, not Object. You cannot declare an array with WithEvents. For more information about events, see Events. Note Code outside a class, structure, or module must qualify a member variable's name with the name of that class, structure, or module. Code outside a procedure or block cannot refer to any local variables within that procedure or block. Releasing Managed ResourcesThe .NET Framework garbage collector disposes of managed resources without any extra coding on your part. However, you can force the disposal of a managed resource instead of waiting for the garbage collector. If a class holds onto a particularly valuable and scarce resource (such as a database connection or file handle), you might not want to wait until the next garbage collection to clean up a class instance that's no longer in use. A class may implement the IDisposable interface to provide a way to release resources before a garbage collection. A class that implements that interface exposes a Dispose method that can be called to force valuable resources to be released immediately. The Using statement automates the process of acquiring a resource, executing a set of statements, and then disposing of the resource. However, the resource must implement the IDisposable interface. For more information, see Using Statement. See also
Event StatementDeclares a user-defined event. Syntax[ <attrlist> ] [ accessmodifier ] _
[ Shared ] [ Shadows ] Event eventname[(parameterlist)] _
[ Implements implementslist ]
' -or-
[ <attrlist> ] [ accessmodifier ] _
[ Shared ] [ Shadows ] Event eventname As delegatename _
[ Implements implementslist ]
' -or-
[ <attrlist> ] [ accessmodifier ] _
[ Shared ] [ Shadows ] Custom Event eventname As delegatename _
[ Implements implementslist ]
[ <attrlist> ] AddHandler(ByVal value As delegatename)
[ statements ]
End AddHandler
[ <attrlist> ] RemoveHandler(ByVal value As delegatename)
[ statements ]
End RemoveHandler
[ <attrlist> ] RaiseEvent(delegatesignature)
[ statements ]
End RaiseEvent
End Event
Parts
RemarksOnce the event has been declared, use the RaiseEvent statement to raise the event. A typical event might be declared and raised as shown in the following fragments:
VB
Public Class EventSource
' Declare an event.
Public Event LogonCompleted(ByVal UserName As String)
Sub CauseEvent()
' Raise an event on successful logon.
RaiseEvent LogonCompleted("AustinSteele")
End Sub
End Class
Note You can declare event arguments just as you do arguments of procedures, with the following exceptions: events cannot have named arguments, ParamArray arguments, or Optional arguments. Events do not have return values. To handle an event, you must associate it with an event handler subroutine using either the Handles or AddHandler statement. The signatures of the subroutine and the event must match. To handle a shared event, you must use the AddHandler statement. You can use Event only at module level. This means the declaration context for an event must be a class, structure, module, or interface, and cannot be a source file, namespace, procedure, or block. For more information, see Declaration Contexts and Default Access Levels. In most circumstances, you can use the first syntax in the Syntax section of this topic for declaring events. However, some scenarios require that you have more control over the detailed behavior of the event. The last syntax in the Syntax section of this topic, which uses the Custom keyword, provides that control by enabling you to define custom events. In a custom event, you specify exactly what occurs when code adds or removes an event handler to or from the event, or when code raises the event. For examples, see How to: Declare Custom Events To Conserve Memory and How to: Declare Custom Events To Avoid Blocking. Note The My.Application.DoEvents method does not process events in the same way the form does. To enable the form to handle the events directly, you can use multithreading. For more information, see Managed Threading. See also
Implements StatementSpecifies one or more interfaces, or interface members, that must be implemented in the class or structure definition in which it appears. SyntaxImplements interfacename [, ...] -or- Implements interfacename.interfacemember [, ...] Parts
interfacename
interfacemember RemarksAn interface is a collection of prototypes representing the members (properties, procedures, and events) the interface encapsulates. Interfaces contain only the declarations for members; classes and structures implement these members. For more information, see Interfaces. The Implements statement must immediately follow the Class or Structure statement. When you implement an interface, you must implement all the members declared in the interface. Omitting any member is considered to be a syntax error. To implement an individual member, you specify the Implements keyword (which is separate from the Implements statement) when you declare the member in the class or structure. For more information, see Interfaces. Classes can use Private implementations of properties and procedures, but these members are accessible only by casting an instance of the implementing class into a variable declared to be of the type of the interface. See alsoImports Statement (.NET Namespace and Type)Enables type names to be referenced without namespace qualification. SyntaxImports [ aliasname = ] namespace -or- Imports [ aliasname = ] namespace.element Parts
RemarksThe Imports statement enables types that are contained in a given namespace to be referenced directly. You can supply a single namespace name or a string of nested namespaces. Each nested namespace is separated from the next higher level namespace by a period (.), as the following example illustrates. Imports System.Collections.Generic Each source file can contain any number of Imports statements. These must follow any option declarations, such as the Option Strict statement, and they must precede any programming element declarations, such as Module or Class statements. You can use Imports only at file level. This means the declaration context for importation must be a source file, and cannot be a namespace, class, structure, module, interface, procedure, or block. Note that the Imports statement does not make elements from other projects and assemblies available to your project. Importing does not take the place of setting a reference. It only removes the need to qualify names that are already available to your project. For more information, see "Importing Containing Elements" in References to Declared Elements. Note You can define implicit Imports statements by using the References Page, Project Designer (Visual Basic). For more information, see How to: Add or Remove Imported Namespaces (Visual Basic). Import AliasesAn import alias defines the alias for a namespace or type. Import aliases are useful when you need to use items with the same name that are declared in one or more namespaces. For more information and an example, see "Qualifying an Element Name" in References to Declared Elements. You should not declare a member at module level with the same name as aliasname. If you do, the Visual Basic compiler uses aliasname only for the declared member and no longer recognizes it as an import alias. Although the syntax used for declaring an import alias is like that used for importing an XML namespace prefix, the results are different. An import alias can be used as an expression in your code, whereas an XML namespace prefix can be used only in XML literals or XML axis properties as the prefix for a qualified element or attribute name. Element NamesIf you supply element, it must represent a container element, that is, a programming element that can contain other elements. Container elements include classes, structures, modules, interfaces, and enumerations. The scope of the elements made available by an Imports statement depends on whether you specify element. If you specify only namespace, all uniquely named members of that namespace, and members of container elements within that namespace, are available without qualification. If you specify both namespace and element, only the members of that element are available without qualification. See also
Imports Statement (XML Namespace)Imports XML namespace prefixes for use in XML literals and XML axis properties. SyntaxImports <xmlns:xmlNamespacePrefix = "xmlNamespaceName"> Parts
xmlNamespacePrefix
xmlNamespaceName RemarksYou can use the Imports statement to define global XML namespaces that you can use with XML literals and XML axis properties, or as parameters passed to the GetXmlNamespace operator. (For information about using the Imports statement to import an alias that can be used where type names are used in your code, see Imports Statement (.NET Namespace and Type).) The syntax for declaring an XML namespace by using the Imports statement is identical to the syntax used in XML. Therefore, you can copy a namespace declaration from an XML file and use it in an Imports statement. XML namespace prefixes are useful when you want to repeatedly create XML elements that are from the same namespace. The XML namespace prefix declared with the Imports statement is global in the sense that it is available to all code in the file. You can use it when you create XML element literals and when you access XML axis properties. For more information, see XML Element Literal and XML Axis Properties. If you define a global XML namespace without a namespace prefix (for example, Imports <xmlns="http://SomeNameSpace>"), that namespace is considered the default XML namespace. The default XML namespace is used for any XML element literals or XML attribute axis properties that do not explicitly specify a namespace. The default namespace is also used if the specified namespace is the empty namespace (that is, xmlns=""). The default XML namespace does not apply to XML attributes in XML literals or to XML attribute axis properties that do not have a namespace. XML namespaces that are defined in an XML literal, which are called local XML namespaces, take precedence over XML namespaces that are defined by the Imports statement as global. XML namespaces that are defined by the Imports statement take precedence over XML namespaces imported for a Visual Basic project. If an XML literal defines an XML namespace, that local namespace does not apply to embedded expressions. Global XML namespaces follow the same scoping and definition rules as .NET Framework namespaces. As a result, you can include an Imports statement to define a global XML namespace anywhere you can import a .NET Framework namespace. This includes both code files and project-level imported namespaces. For information about project-level imported namespaces, see References Page, Project Designer (Visual Basic). Each source file can contain any number of Imports statements. These must follow option declarations, such as the Option Strict statement, and they must precede programming element declarations, such as Module or Class statements. See also
Inherits StatementCauses the current class or interface to inherit the attributes, variables, properties, procedures, and events from another class or set of interfaces. SyntaxInherits basetypenames Parts
RemarksIf used, the Inherits statement must be the first non-blank, non-comment line in a class or interface definition. It should immediately follow the Class or Interface statement. You can use Inherits only in a class or interface. This means the declaration context for an inheritance cannot be a source file, namespace, structure, module, procedure, or block. Rules
An example of class inheritance in the .NET Framework is the ArgumentException class, which inherits from the SystemException class. This provides to ArgumentException all the predefined properties and procedures required by system exceptions, such as the Message property and the ToString method. An example of interface inheritance in the .NET Framework is the ICollection interface, which inherits from the IEnumerable interface. This causes ICollection to inherit the definition of the enumerator required to traverse a collection. See alsoInterface StatementDeclares the name of an interface and introduces the definitions of the members that the interface comprises. Syntax[ <attributelist> ] [ accessmodifier ] [ Shadows ] _
Interface name [ ( Of typelist ) ]
[ Inherits interfacenames ]
[ [ modifiers ] Property membername ]
[ [ modifiers ] Function membername ]
[ [ modifiers ] Sub membername ]
[ [ modifiers ] Event membername ]
[ [ modifiers ] Interface membername ]
[ [ modifiers ] Class membername ]
[ [ modifiers ] Structure membername ]
End Interface
Parts
RemarksAn interface defines a set of members, such as properties and procedures, that classes and structures can implement. The interface defines only the signatures of the members and not their internal workings. A class or structure implements the interface by supplying code for every member defined by the interface. Finally, when the application creates an instance from that class or structure, an object exists and runs in memory. For more information, see Objects and Classes and Interfaces. You can use Interface only at namespace or module level. This means the declaration context for an interface must be a source file, namespace, class, structure, module, or interface, and cannot be a procedure or block. For more information, see Declaration Contexts and Default Access Levels. Interfaces default to Friend access. You can adjust their access levels with the access modifiers. For more information, see Access levels in Visual Basic. Rules
Behavior
Note that the Property and Function statements do not introduce blocks ending with End Property and End Function within the interface. The interface defines only the signatures of its members. The full Property and Function blocks appear in a class that implements thisInterface. See also
Namespace StatementDeclares the name of a namespace and causes the source code that follows the declaration to be compiled within that namespace. Syntax
VB
Namespace [Global.] { name | name.name }
[ componenttypes ]
End Namespace
Parts
Global
name
componenttypes
End Namespace RemarksNamespaces are used as an organizational system. They provide a way to classify and present programming elements that are exposed to other programs and applications. Note that a namespace is not a type in the sense that a class or structure is—you cannot declare a programming element to have the data type of a namespace. All programming elements declared after a Namespace statement belong to that namespace. Visual Basic continues to compile elements into the last declared namespace until it encounters either an End Namespace statement or another Namespace statement. If a namespace is already defined, even outside your project, you can add programming elements to it. To do this, you use a Namespace statement to direct Visual Basic to compile elements into that namespace. You can use a Namespace statement only at the file or namespace level. This means the declaration context for a namespace must be a source file or another namespace, and cannot be a class, structure, module, interface, or procedure. For more information, see Declaration Contexts and Default Access Levels. You can declare one namespace within another. There is no strict limit to the levels of nesting you can declare, but remember that when other code accesses the elements declared in the innermost namespace, it must use a qualification string that contains all the namespace names in the nesting hierarchy. Access LevelNamespaces are treated as if they have a Public access level. A namespace can be accessed from code anywhere in the same project, from other projects that reference the project, and from any assembly built from the project. Programming elements declared at namespace level, meaning in a namespace but not inside any other element, can have Public or Friend access. If unspecified, the access level of such an element uses Friend by default. Elements you can declare at namespace level include classes, structures, modules, interfaces, enumerations, and delegates. For more information, see Declaration Contexts and Default Access Levels. Root NamespaceAll namespace names in your project are based on a root namespace. Visual Studio assigns your project name as the default root namespace for all code in your project. For example, if your project is named Payroll, its programming elements belong to namespace Payroll. If you declare Namespace funding, the full name of that namespace is Payroll.funding. If you want to specify an existing namespace in a Namespace statement, such as in the generic list class example, you can set your root namespace to a null value. To do this, click Project Properties from the Project menu and then clear the Root namespace entry so that the box is empty. If you did not do this in the generic list class example, the Visual Basic compiler would take System.Collections.Generic as a new namespace within project Payroll, with the full name of Payroll.System.Collections.Generic. Alternatively, you can use the Global keyword to refer to elements of namespaces defined outside your project. Doing so lets you retain your project name as the root namespace. This reduces the chance of unintentionally merging your programming elements together with those of existing namespaces. For more information, see the "Global Keyword in Fully Qualified Names" section in Namespaces in Visual Basic. The Global keyword can also be used in a Namespace statement. This lets you define a namespace out of the root namespace of your project. For more information, see the "Global Keyword in Namespace Statements" section in Namespaces in Visual Basic. Troubleshooting. The root namespace can lead to unexpected concatenations of namespace names. If you make reference to namespaces defined outside your project, the Visual Basic compiler can construe them as nested namespaces in the root namespace. In such a case, the compiler does not recognize any types that have been already defined in the external namespaces. To avoid this, either set your root namespace to a null value as described in "Root Namespace," or use the Global keyword to access elements of external namespaces. Attributes and ModifiersYou cannot apply attributes to a namespace. An attribute contributes information to the assembly's metadata, which is not meaningful for source classifiers such as namespaces. You cannot apply any access or procedure modifiers, or any other modifiers, to a namespace. Because it is not a type, these modifiers are not meaningful. See alsoReDim StatementReallocates storage space for an array variable. SyntaxReDim [ Preserve ] name(boundlist) [ , name(boundlist) [, ... ] ] Parts
RemarksYou can use the ReDim statement to change the size of one or more dimensions of an array that has already been declared. If you have a large array and you no longer need some of its elements, ReDim can free up memory by reducing the array size. On the other hand, if your array needs more elements, ReDim can add them. The ReDim statement is intended only for arrays. It's not valid on scalars (variables that contain only a single value), collections, or structures. Note that if you declare a variable to be of type Array, the ReDim statement doesn't have sufficient type information to create the new array. You can use ReDim only at procedure level. Therefore, the declaration context for the variable must be a procedure; it can't be a source file, a namespace, an interface, a class, a structure, a module, or a block. For more information, see Declaration Contexts and Default Access Levels. Rules
Behavior
See alsoSource/Reference
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