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ColumnAttribute Class

July 28, 2014

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

The ColumnAttribute type exposes the following members.

  NameDescription
Public methodColumnAttributeInitializes a new instance of the ColumnAttribute class.
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  NameDescription
Public propertyAutoSyncGets or sets the AutoSync enumeration.
Public propertyCanBeNullGets or sets whether a column can contain null values.
Public propertyDbTypeGets or sets the type of the database column.
Public propertyExpressionGets or sets whether a column is a computed column in a database.
Public propertyIsDbGeneratedGets or sets whether a column contains values that the database auto-generates.
Public propertyIsDiscriminatorGets or sets whether a column contains a discriminator value for a LINQ to SQL inheritance hierarchy.
Public propertyIsPrimaryKeyGets or sets whether this class member represents a column that is part or all of the primary key of the table.
Public propertyIsVersionGets or sets whether the column type of the member is a database timestamp or version number.
Public propertyNameGets or sets the name of a column. (Inherited from DataAttribute.)
Public propertyStorageGets or sets a private storage field to hold the value from a column. (Inherited from DataAttribute.)
Public propertyUpdateCheckGets or sets how LINQ to SQL approaches the detection of optimistic concurrency conflicts.
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  NameDescription
Public methodEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns 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");
            }
        }
    }
}

Windows Phone OS

Supported in: 8.1, 8.0

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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