通过

ReportParameter.AllowBlank 属性

Indicates the value for this parameter is allowed to be the empty string.

命名空间：  Microsoft.ReportingServices.RdlObjectModel
程序集：  Microsoft.ReportingServices.Designer.Controls（在 Microsoft.ReportingServices.Designer.Controls.dll 中）

语法

声明
Public Property AllowBlank As Boolean
    Get
    Set
用法
Dim instance As ReportParameter
Dim value As Boolean

value = instance.AllowBlank

instance.AllowBlank = value

public bool AllowBlank { get; set; }

public:
property bool AllowBlank {
    bool get ();
    void set (bool value);
}

member AllowBlank : bool with get, set

function get AllowBlank () : boolean
function set AllowBlank (value : boolean)

属性值

类型：System.Boolean
A boolean value.