ObjectDataSource.Constructor Property

Specifies an object that enables an ObjectDataSource to access constructor parameters.

Namespace: DevExpress.DataAccess.ObjectBinding

Assembly: DevExpress.DataAccess.v23.2.dll

NuGet Packages: DevExpress.DataAccess, DevExpress.Win.PivotGrid, DevExpress.Win.TreeMap

Declaration

C#

[DefaultValue(null)]
public ObjectConstructorInfo Constructor { get; set; }

VB.NET

<DefaultValue(Nothing)>
Public Property Constructor As ObjectConstructorInfo

Property Value

Type	Default	Description
ObjectConstructorInfo	null	An ObjectConstructorInfo value.

Remarks

If it is required that on calling the ObjectDataSource.Fill method, an ObjectDataSource should create an instance of the type specified by its ObjectDataSource.DataSource property, use the Constructor property to specify the required constructor parameters. To assign a constructor without parameters, use the static ObjectConstructorInfo.Default object.

View Example: How to Create a Report Bound to the ObjectDataSource with Constructor Parameters Linked to Report Parameters

Set this property to null for the ObjectDataSource to never try to create an object instance (if you need to manually create and assign it, or when binding to a static member).

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the Constructor property.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

reporting-web-forms-report-designer-add-data-sources/CS/WebApplication1/Default.aspx.cs#L88

objds.DataSource = typeof(ItemList);
objds.Constructor = new DevExpress.DataAccess.ObjectBinding.ObjectConstructorInfo();
objds.EndInit();

how-to-create-data-access-library-data-sources-at-runtime-t424210/CS/ObjectDataSourceSnippets/Code.cs#L22

    var parameter = new DevExpress.DataAccess.ObjectBinding.Parameter("p1", typeof(int), 3);
    objds.Constructor = new DevExpress.DataAccess.ObjectBinding.ObjectConstructorInfo(parameter);
}

reporting-web-object-data-source/CS/Reporting-How-To-Use-Object-Data-Source/MVC/CS/Reporting_ObjectDS_Mvc/Controllers/HomeController.cs#L17

dataSource.DataSource = typeof(Employees.EmployeeList);
dataSource.Constructor = ObjectConstructorInfo.Default;
dataSource.DataMember = "Items";

reporting-web-forms-object-data-source-constructor-parameters/CS/DXWebApplication1/Default.aspx.cs#L63

objds.Constructor = new DevExpress.DataAccess.ObjectBinding.ObjectConstructorInfo(p);
return objds;

VB.NET

reporting-web-forms-report-designer-add-data-sources/VB/WebApplication1/Default.aspx.vb#L79

objds.DataSource = GetType(ItemList)
objds.Constructor = New DevExpress.DataAccess.ObjectBinding.ObjectConstructorInfo()
objds.EndInit()

how-to-create-data-access-library-data-sources-at-runtime-t424210/VB/ObjectDataSourceSnippets/Code.vb#L19

    Dim parameter = New DevExpress.DataAccess.ObjectBinding.Parameter("p1", GetType(Integer), 3)
    objds.Constructor = New DevExpress.DataAccess.ObjectBinding.ObjectConstructorInfo(parameter)
End Sub

reporting-web-object-data-source/CS/Reporting-How-To-Use-Object-Data-Source/MVC/VB/Reporting_ObjectDS_Mvc/Controllers/HomeController.vb#L18

dataSource.DataSource = GetType(Employees.EmployeeList)
dataSource.Constructor = ObjectConstructorInfo.Default
dataSource.DataMember = "Items"

reporting-web-forms-object-data-source-constructor-parameters/VB/DXWebApplication1/DXWebApplication1/Default.aspx.vb#L72

objds.Constructor = New DevExpress.DataAccess.ObjectBinding.ObjectConstructorInfo(p)
Return objds