CodeVariable2.InitExpression Property

Definition

Namespace:

EnvDTE80

Assembly:

Microsoft.VisualStudio.Interop.dll

Package:

Microsoft.VisualStudio.Interop v17.11.40262

Gets or sets an object defining the initialization code for an element.

public:
 property System::Object ^ InitExpression { System::Object ^ get(); void set(System::Object ^ value); };

public:
 property Platform::Object ^ InitExpression { Platform::Object ^ get(); void set(Platform::Object ^ value); };

[System.Runtime.InteropServices.DispId(33)]
public object InitExpression { [System.Runtime.InteropServices.DispId(33)] get; [System.Runtime.InteropServices.DispId(33)] set; }

[<System.Runtime.InteropServices.DispId(33)>]
[<get: System.Runtime.InteropServices.DispId(33)>]
[<set: System.Runtime.InteropServices.DispId(33)>]
member this.InitExpression : obj with get, set

Public Property InitExpression As Object

Property Value

Object

An object defining the initialization expression for the code variable.

Implements

InitExpression

Attributes

DispIdAttribute

Examples

Sub InitExpressionExample(ByVal dte As DTE2)  

    ' Before running this example, open a code document from a project  
    ' and place the insertion point inside a class definition.  
    Try  
        ' Retrieve the CodeClass at the insertion point.  
        Dim sel As TextSelection = _  
            CType(dte.ActiveDocument.Selection, TextSelection)  
        Dim cls As CodeClass = _  
            CType(sel.ActivePoint.CodeElement( _  
            vsCMElement.vsCMElementClass), CodeClass)  

        ' Create and initialize a new member variable.  
        Dim byt As CodeVariable = _  
            cls.AddVariable("var1", vsCMTypeRef.vsCMTypeRefByte)  
        byt.InitExpression = "255"  
    Catch ex As Exception  
        MsgBox(ex.Message)  
    End Try  

End Sub  

public void InitExpressionExample(DTE2 dte)  
{  
    // Before running this example, open a code document from a project  
    // and place the insertion point inside a class definition.  
    try  
    {  
        // Retrieve the CodeClass at the insertion point.  
        TextSelection sel =   
            (TextSelection)dte.ActiveDocument.Selection;  
        CodeClass cls =   
            (CodeClass)sel.ActivePoint.get_CodeElement(  
            vsCMElement.vsCMElementClass);  

        // Create and initialize a new member variable.  
        CodeVariable byt = cls.AddVariable("var1",   
            vsCMTypeRef.vsCMTypeRefByte, -1,   
            vsCMAccess.vsCMAccessPublic, null);  
        byt.InitExpression = "255";  
    }  
    catch (Exception ex)  
    {  
        MessageBox.Show(ex.Message);  
    }  
}  

Remarks

The value must be a string or a CodeElement for an expression object. When setting this to a string, the implementation of InitExpression inserts any syntax required, such as equal signs or semicolons if the variable does not already have an initialization expression.

Depending on the languages and any syntactic or semantic checks it performs on the string passed in, setting InitExpression might fail. Languages are not required to check the string, and because the string is necessarily language-dependent, setting this property can result in undefined behavior if the string has ill-formed content in any way.

When setting this property to a CodeElement, whether or not the CodeElement must be newly created depends on the language implementation of the code model. Some languages might implement copying semantics if you pass in a CodeElement that is already in a source file.

Note

The values of code model elements such as classes, structs, functions, attributes, delegates, and so forth can be non-deterministic after making certain kinds of edits, meaning that their values cannot be relied upon to always remain the same. For more information, see the section Code Model Element Values Can Change in Discovering Code by Using the Code Model (Visual Basic).