Parameter.AllowNull Property

Indicates whether the parameter‘s value can be unspecified.

Namespace: DevExpress.XtraReports.Parameters

Assembly: DevExpress.Printing.v20.1.Core.dll

NuGet Packages: DevExpress.Printing.Core, DevExpress.WindowsDesktop.Printing.Core

Declaration

C#

[DefaultValue(false)]
public bool AllowNull { get; set; }

VB.NET

<DefaultValue(False)>
Public Property AllowNull As Boolean

Property Value

Type	Default	Description
Boolean	false	true, to allow the parameter to be unspecified; otherwise, false.

Remarks

If this property is set to true, end users can leave the parameter editor empty on the Parameters panel.

Boolean Parameter

Date-Time Parameter

Integer Parameter

String Parameter

Lookup Parameter

Multi-Value Parameter

You can provide specific report data when the parameter is set to null.