代码优先迁移中的EFCore AlterColumn MaxLength

using Microsoft.EntityFrameworkCore.Migrations;

public partial class AlterColumnMaxLength : Migration
{
    protected override void Up(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.AlterColumn<string>(
            name: "ColumnName",
            table: "TableName",
            maxLength: 100,
            nullable: false,
            oldMaxLength: 50);
    }

    protected override void Down(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.AlterColumn<string>(
            name: "ColumnName",
            table: "TableName",
            maxLength: 50,
            nullable: false,
            oldMaxLength: 100);
    }
}