LinqServerModeDataSourceSelectEventArgs.KeyExpression Property

Gets or sets the key expression.

Namespace: DevExpress.Data.Linq

Assembly: DevExpress.Web.v20.2.dll

NuGet Package: DevExpress.Web

Declaration

C#

public string KeyExpression { get; set; }

VB.NET

Public Property KeyExpression As String

Property Value

Type	Description
String	Specifies the name of the key property.

Remarks

Example

The following example illustrates how to use the KeyExpression property.

C#

protected void EntityServerModeDataSource1_Selecting(object sender, DevExpress.Data.Linq.LinqServerModeDataSourceSelectEventArgs e) {
    var db = new YourDataContext();
    e.KeyExpression = "ID_FIELD_FROM_YOUR_TABLE";
    e.QueryableSource = db.Products;
    //or
    e.QueryableSource = db.Products.Where(p=>p.Price > 10);
    //or other linq query
}

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the KeyExpression 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#

gridview-how-to-define-calculated-fields-in-the-server-mode-webforms/CS/CalculatedFieldsInServerModeWebForms/Default.aspx.cs#L21

    e.QueryableSource = db.CustomProducts(30, new DateTime(2018, 5, 16));
    e.KeyExpression = "Id";
}

VB.NET

gridview-how-to-define-calculated-fields-in-the-server-mode-webforms/VB/CalculatedFieldsInServerModeWebForms/Default.aspx.vb#L19

    e.QueryableSource = db.CustomProducts(30, New DateTime(2018, 5, 16))
    e.KeyExpression = "Id"
End Sub