MigrationBuilder.DropColumn(String, String, String) 方法

定义

命名空间:

Microsoft.EntityFrameworkCore.Migrations

程序集:

Microsoft.EntityFrameworkCore.Relational.dll

包:

Microsoft.EntityFrameworkCore.Relational v9.0.0

Source:

MigrationBuilder.cs

生成 以 DropColumnOperation 删除现有列。

public virtual Microsoft.EntityFrameworkCore.Migrations.Operations.Builders.OperationBuilder<Microsoft.EntityFrameworkCore.Migrations.Operations.DropColumnOperation> DropColumn (string name, string table, string? schema = default);

abstract member DropColumn : string * string * string -> Microsoft.EntityFrameworkCore.Migrations.Operations.Builders.OperationBuilder<Microsoft.EntityFrameworkCore.Migrations.Operations.DropColumnOperation>
override this.DropColumn : string * string * string -> Microsoft.EntityFrameworkCore.Migrations.Operations.Builders.OperationBuilder<Microsoft.EntityFrameworkCore.Migrations.Operations.DropColumnOperation>

Public Overridable Function DropColumn (name As String, table As String, Optional schema As String = Nothing) As OperationBuilder(Of DropColumnOperation)

参数

name

String

要删除的列的名称。

table

String

包含列的表。

schema

String

包含表的架构，或使用 null 默认架构。

返回

OperationBuilder<DropColumnOperation>

一个生成器，允许将批注添加到操作中。

注解

有关详细信息和示例 ，请参阅数据库迁移 。