corelibraries-devexpress-dot-data-dot-linq-dot-entityservermodesource-55638e86.md
Gets or sets the key expression.
Namespace : DevExpress.Data.Linq
Assembly : DevExpress.Data.v25.2.dll
NuGet Package : DevExpress.Data
[DefaultValue("")]
public string KeyExpression { get; set; }
<DefaultValue("")>
Public Property KeyExpression As String
| Type | Default | Description |
|---|---|---|
| String | String.Empty |
A String value that specifies the key expression.
|
In most instances, the KeyExpression property specifies the key field name:
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 “.
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.
esms.QueryableSource = DataContext.Products;
esms.KeyExpression = "ProductID";
esms.QueryableSource = DataContext.Products
esms.KeyExpression = "ProductID"
Return esms
See Also