ImmediatePostDataAttribute Class

An attribute you can apply to business class properties. This attribute indicates that the Property Editor’s control value should be passed to the property of a bound object as soon as possible when a user changes the editor’s value.

Namespace: DevExpress.Persistent.Base

Assembly: DevExpress.ExpressApp.v25.2.dll

NuGet Package: DevExpress.ExpressApp

Declaration

C#

[AttributeUsage(AttributeTargets.Property, Inherited = true, AllowMultiple = false)]
public sealed class ImmediatePostDataAttribute :
    ModelExportedValueAttribute

VB.NET

<AttributeUsage(AttributeTargets.Property, Inherited:=True, AllowMultiple:=False)>
Public NotInheritable Class ImmediatePostDataAttribute
    Inherits ModelExportedValueAttribute

Remarks

The code snippet below demonstrates how to apply the ImmediatePostData attribute to a business class property in code. For instance, this property allows you to force an update of other values that are calculated based on the current property.

C#

using DevExpress.Persistent.Base;
// ...
[ImmediatePostData]
public double Rate {
    get {
        //...
    }
    set {
        //...           
    }
}

Impact on Other Properties

When you apply the ImmediatePostData attribute to a business class property, you automatically set the Application Model‘s BOModel | <Class> | OwnMembers | <Member> | ImmediatePostData default property value to true.

Note that you can set or change this property’s value using the Model Editor as shown in the Make a Property Calculable topic.

Any changes to the BOModel | <Class> | OwnMembers | <Member> | ImmediatePostData property value affect the default value of the same property in the following nodes:

• Views | <DetailView> | Items | <PropertyEditor>,
• Views | <ListView> | Columns | <Column>.

You can modify the property’s value in the nodes above to, for example, disable ImmediatePostData for certain Views.

These nodes’ ImmediatePostData properties specify the default values for the corresponding PropertyEditor.ImmediatePostData properties.

The diagram below demonstrates different levels where the ImmediatePostData setting can be applied. Higher levels determine default values for lower levels.

Limitations

• In Batch edit mode, ImmediatePostData affects properties of the current row only.

Inheritance

Object

Attribute

DevExpress.Persistent.Base.ModelExportedValueAttribute

ImmediatePostDataAttribute