ColumnAttribute.IsPrimaryKey Property
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Gets or sets whether this class member represents a column that is part or all of the primary key of the table.
Namespace: System.Data.Linq.Mapping
Assembly: System.Data.Linq (in System.Data.Linq.dll)
Syntax
'Declaration
Public Property IsPrimaryKey As Boolean
public bool IsPrimaryKey { get; set; }
Property Value
Type: System.Boolean
Default = false.
Remarks
Assuming an entity class, you must provide at least one member with this attribute, and it must be mapped to the primary key or a unique key in the corresponding table or view. Failure to do this prompts LINQ to SQL to consider instances of the class as read-only for submitting changes to the database.
If you designate more than one member of the class by using this property, the key is said to be a composite of the associated columns.
.gif "Note") Note: |
|---|
LINQ to SQL does not support computed columns as primary keys. |
| Topic | Location |
|---|---|
| How to: Represent Primary Keys (LINQ to SQL) | LINQ to SQL |
| Troubleshooting (LINQ to SQL) | LINQ to SQL |
| How to: Represent Primary Keys (LINQ to SQL) | LINQ to SQL |
| Troubleshooting (LINQ to SQL) | LINQ to SQL |
Version Information
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.