通过

Nullable 属性

Gets a Boolean value indicating whether the value of the parameter can be nullNothingnullptrunitnull 引用（在 Visual Basic 中为 Nothing）.

命名空间：  Microsoft.ReportingServices.ReportRendering
程序集：  Microsoft.ReportingServices.ProcessingCore（在 Microsoft.ReportingServices.ProcessingCore.dll 中）

语法

声明
Public ReadOnly Property Nullable As Boolean
    Get
用法
Dim instance As ReportParameter
Dim value As Boolean

value = instance.Nullable

public bool Nullable { get; }

public:
property bool Nullable {
    bool get ();
}

member Nullable : bool

function get Nullable () : boolean

属性值

类型：System. . :: . .Boolean
A Boolean indicating whether the report parameter can be null. A value of true indicates that the parameter can be null. A value of false indicates that the parameter cannot be null.