DbMigration.AlterColumn Method (String, String, Func<ColumnBuilder, ColumnModel>, Object)

 

Adds an operation to alter the definition of an existing column. Entity Framework Migrations APIs are not designed to accept input provided by untrusted sources (such as the end user of an application). If input is accepted from such sources it should be validated before being passed to these APIs to protect against SQL injection attacks etc.

Namespace:   System.Data.Entity.Migrations
Assembly:  EntityFramework (in EntityFramework.dll)

[SuppressMessageAttribute("Microsoft.Design", "CA1026:DefaultParametersShouldNotBeUsed")]
protected internal void AlterColumn(
	string table,
	string name,
	Func<ColumnBuilder, ColumnModel> columnAction,
	object anonymousArguments = null
)

Parameters

table
Type: System.String

The name of the table the column exists in. Schema name is optional, if no schema is specified then dbo is assumed.

name
Type: System.String

The name of the column to be changed.

columnAction
Type: System.Func<ColumnBuilder, ColumnModel>

An action that specifies the new definition for the column. i.e. c =&gt; c.String(nullable: false, defaultValue: "none")

anonymousArguments
Type: System.Object

The additional arguments that may be processed by providers. Use anonymous type syntax to specify arguments e.g. 'new { SampleArgument = "MyValue" }'.