coderushforroslyn-115703-coding-assistance-code-providers-declaration-providers-declare-property.md
Declares a property for a selected reference to an undeclared element. You can use this code provider in Test-Driven Development.
This code provider can also drop a marker onto the selected property reference, if the Marker feature is enabled. See the following topic section for more details: Markers: How to Enable.
Available when the caret is in an undeclared variable reference.
Place the caret in an undeclared variable reference.
Press Ctrl + . or Ctrl + ~ to invoke the Code Actions menu.
Select the Declare menu and choose one of the following providers to declare the corresponding property:
Use the Up Arrow and Down Arrow keys to move the target picker.
Press Enter to generate a code in the selected place.
The generated code depends on the selected code provider and the property used in the original code. If you call the code provider for a variable contained in the right part of an expression, this provider generates a read-only property; otherwise, this provider declares a read-write property.
The following screencasts show the result of applying code providers from the Code Actions menu:
Declare Auto-Implemented Property
Declare Property with Field
Declare Property with Default Body
You can apply the Declare Property (auto-implemented), Declare Property (with field), and Declare Property (with default body) code providers from the following places in .razor files:
From @code sections.
From Razor markup.
You can configure the “Default body of newly-generated methods” setting for the Declare Property with Default Body code provider on the Editor | C# (Visual Basic) | Code Actions | Code Actions Settings options page.
For example, set the “Default body of newly-generated methods” setting to “Return default value”, as shown below:
Run the Declare Property with Default Body code provider. The screencast below shows this setting in action:
For more information, refer to the following topic: Code Actions Settings.
The Declare Property provider can create a property with the specified scope. The default scope of the generated property is Public. To change the visibility modifier:
Open the Editor | C# (Visual Basic) | Scope Options options page.
Set the default scope for a declared property to “Private” and run the Declare Auto-Implemented Property provider.
This provider creates a property with the private visibility, as shown below:
int Prop1 { get; set; }
Private Property Prop1 As Integer
See the following topic for details: Scope.