EntityServerModeSource.KeyExpression Property

Gets or sets the key expression.

Namespace: DevExpress.Data.Linq

Assembly: DevExpress.Data.v24.2.dll

Declaration

C#

[DefaultValue("")]
public string KeyExpression { get; set; }

VB.NET

<DefaultValue("")>
Public Property KeyExpression As String

Property Value

Type	Default	Description
String	String.Empty	A String value that specifies the key expression.

Remarks

In most instances, the KeyExpression property specifies the key field name:

C#

efServerModeSource1.KeyExpression = "CustomerID";

To specify multiple columns of a composite key, pass the comma-separated or semicolon separated list of key column names to this property. For instance: “KeyPart1;KeyPart2;KeyPart3“.

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#

asp-net-web-forms-grid-entitydatasource-and-common-scenarios/CS/GridEntityFramework/ServerModeEF.aspx.cs#L33

esms.QueryableSource = DataContext.Products;
esms.KeyExpression = "ProductID";

VB.NET

asp-net-web-forms-grid-entitydatasource-and-common-scenarios/VB/GridEntityFramework/ServerModeEF.aspx.vb#L35

esms.QueryableSource = DataContext.Products
esms.KeyExpression = "ProductID"
Return esms