ColumnAttribute Class
Associates a class with a column in a database table.
System.Object
System.Attribute
System.Data.Linq.Mapping.DataAttribute
System.Data.Linq.Mapping.ColumnAttribute
System.Attribute
System.Data.Linq.Mapping.DataAttribute
System.Data.Linq.Mapping.ColumnAttribute
Namespace: System.Data.Linq.Mapping
Assembly: System.Data.Linq (in System.Data.Linq.dll)
The ColumnAttribute type exposes the following members.
| Name | Description | |
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AutoSync | Gets or sets the AutoSync enumeration. |
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CanBeNull | Gets or sets whether a column can contain null values. |
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DbType | Gets or sets the type of the database column. |
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Expression | Gets or sets whether a column is a computed column in a database. |
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IsDbGenerated | Gets or sets whether a column contains values that the database auto-generates. |
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IsDiscriminator | Gets or sets whether a column contains a discriminator value for a LINQ to SQL inheritance hierarchy. |
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IsPrimaryKey | Gets or sets whether this class member represents a column that is part or all of the primary key of the table. |
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IsVersion | Gets or sets whether the column type of the member is a database timestamp or version number. |
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Name | Gets or sets the name of a column. (Inherited from DataAttribute.) |
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Storage | Gets or sets a private storage field to hold the value from a column. (Inherited from DataAttribute.) |
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UpdateCheck | Gets or sets how LINQ to SQL approaches the detection of optimistic concurrency conflicts. |
| Name | Description | |
|---|---|---|
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Equals | Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.) |
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Finalize | Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.) |
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GetHashCode | Returns the hash code for this instance. (Inherited from Attribute.) |
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GetType | Gets the Type of the current instance. (Inherited from Object.) |
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Match | When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.) |
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MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
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ToString | Returns a string that represents the current object. (Inherited from Object.) |
Use this attribute to designate a member of an entity class to represent a column in a database table. You can apply this attribute to any field or property that is public, private, or internal.
Only those entity class members identified as columns are persisted when LINQ to SQL saves changes to the database.
Use commas to separate multiple properties on the attribute.
[Table(Name="Employees")] public class Employees { private string _LastName; // … [Column(Storage="_LastName", DbType="NVarChar(20) NOT NULL", CanBeNull=false)] public string LastName { get { return this._LastName; } set { if ((this._LastName != value)) { this.OnPropertyChanging("LastName"); this._LastName = value; this.OnPropertyChanged("LastName"); } } } }
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