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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

Namespace:  System.Data.Linq.Mapping
Assembly:  System.Data.Linq (in System.Data.Linq.dll)

[AttributeUsageAttribute(AttributeTargets.Property|AttributeTargets.Field, AllowMultiple = false)]
public sealed class ColumnAttribute : DataAttribute

The ColumnAttribute type exposes the following members.

  NameDescription
Public methodSupported by Silverlight for Windows PhoneColumnAttributeInitializes a new instance of the ColumnAttribute class.
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  NameDescription
Public propertySupported by Silverlight for Windows PhoneAutoSyncGets or sets the AutoSync enumeration.
Public propertySupported by Silverlight for Windows PhoneCanBeNullGets or sets whether a column can contain null values.
Public propertySupported by Silverlight for Windows PhoneDbTypeGets or sets the type of the database column.
Public propertySupported by Silverlight for Windows PhoneExpressionGets or sets whether a column is a computed column in a database.
Public propertySupported by Silverlight for Windows PhoneIsDbGeneratedGets or sets whether a column contains values that the database auto-generates.
Public propertySupported by Silverlight for Windows PhoneIsDiscriminatorGets or sets whether a column contains a discriminator value for a LINQ to SQL inheritance hierarchy.
Public propertySupported by Silverlight for Windows PhoneIsPrimaryKeyGets or sets whether this class member represents a column that is part or all of the primary key of the table.
Public propertySupported by Silverlight for Windows PhoneIsVersionGets or sets whether the column type of the member is a database timestamp or version number.
Public propertySupported by Silverlight for Windows PhoneNameGets or sets the name of a column. (Inherited from DataAttribute.)
Public propertySupported by Silverlight for Windows PhoneStorageGets or sets a private storage field to hold the value from a column. (Inherited from DataAttribute.)
Public propertySupported by Silverlight for Windows PhoneUpdateCheckGets or sets how LINQ to SQL approaches the detection of optimistic concurrency conflicts.
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  NameDescription
Public methodSupported by Silverlight for Windows PhoneEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Protected methodSupported by Silverlight for Windows PhoneFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodSupported by Silverlight for Windows PhoneGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Protected methodSupported by Silverlight for Windows PhoneMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneToStringReturns a string that represents the current object. (Inherited from Object.)
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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");
            }
        }
    }
}

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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