将模型 .net Core 2.2 中关键属性的数据类型从 int 更改为 long

Question

我想将 ASP.Net core 2.2 中模型的主键的数据类型从 int 更改为 long，因为它即将超出 int 范围。该应用程序以代码为先，并使用 SQL 服务器作为数据库。

更改模型中的数据类型有效并且运行 Add-Migration 也有效，但 Update-Database 失败并显示错误：

System.Data.SqlClient.SqlException (0x80131904): The index 'IX_tblMTransactions_OriginalTransactionId' is dependent on column 'OriginalTransactionId'.
The object 'FK_tblMTransactions_tblMTransactions_OriginalTransactionId' is dependent on column 'OriginalTransactionId'.

所以我阅读了它，似乎需要对迁移进行一些调整，例如在列更改之前删除外键和索引，然后将它们带回来。不幸的是，我找不到任何有关在 .net core 2.2 中执行此操作的有用信息，我找到的最接近的是这个问题，但它谈到了 .net core 2.1 和选项DropForeignKey并DropIndex 提到那里似乎不再可用.net core 2.2 根据这篇文章。

这是迁移类：

public partial class _20190817_1746 : Migration
{
    protected override void Up(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.AlterColumn<long>(
            name: "OriginalTransactionId",
            table: "tblMTransactions",
            nullable: true,
            oldClrType: typeof(int),
            oldNullable: true);

        migrationBuilder.AlterColumn<long>(
            name: "Id",
            table: "tblMTransactions",
            nullable: false,
            oldClrType: typeof(int))
            .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn)
            .OldAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
    }

    protected override void Down(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.AlterColumn<int>(
            name: "OriginalTransactionId",
            table: "tblMTransactions",
            nullable: true,
            oldClrType: typeof(long),
            oldNullable: true);

        migrationBuilder.AlterColumn<int>(
            name: "Id",
            table: "tblMTransactions",
            nullable: false,
            oldClrType: typeof(long))
            .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn)
            .OldAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
    }
}

这是该表的列、键和索引的屏幕截图：

有人知道如何调整 .NET Core 2.2 中的迁移类以使其工作吗？

谢谢

Answer 1

感谢Ivan Stoev，我找到了解决方案。我必须像这样手动添加索引和键的删除和创建：

public partial class _20190817_2317 : Migration
{
    protected override void Up(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.DropForeignKey(
            name: "FK_tblMTransactions_tblMTransactions_OriginalTransactionId",
            table: "tblMTransactions");

        migrationBuilder.DropIndex(
            name: "IX_tblMTransactions_OriginalTransactionId",
            table: "tblMTransactions");

        migrationBuilder.DropPrimaryKey(
            name: "PK_tblMTransactions",
            table: "tblMTransactions");

        migrationBuilder.AlterColumn<long>(
            name: "OriginalTransactionId",
            table: "tblMTransactions",
            nullable: true,
            oldClrType: typeof(int),
            oldNullable: true);

        migrationBuilder.AlterColumn<long>(
            name: "Id",
            table: "tblMTransactions",
            nullable: false,
            oldClrType: typeof(int))
            .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn)
            .OldAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);

        migrationBuilder.AddPrimaryKey(
            name: "PK_tblMTransactions",
            table: "tblMTransactions",
            column: "Id");

        migrationBuilder.CreateIndex(
            name: "IX_tblMTransactions_OriginalTransactionId",
            table: "tblMTransactions",
            column: "OriginalTransactionId");

        migrationBuilder.AddForeignKey(
            name: "FK_tblMTransactions_tblMTransactions_OriginalTransactionId",
            table: "tblMTransactions",
            column: "OriginalTransactionId",
            principalTable: "tblMTransactions",
            principalColumn: "Id",
            onDelete: ReferentialAction.Restrict);
    }

    protected override void Down(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.AlterColumn<int>(
            name: "OriginalTransactionId",
            table: "tblMTransactions",
            nullable: true,
            oldClrType: typeof(long),
            oldNullable: true);

        migrationBuilder.AlterColumn<int>(
            name: "Id",
            table: "tblMTransactions",
            nullable: false,
            oldClrType: typeof(long))
            .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn)
            .OldAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
    }
}

再次感谢，伊万！！