In part 4 of the ASP.NET Core MVC tutorial for Visual Studio code, the EF migrations cli command of

在面向Visual Studio代码的ASP.NET核心MVC教程的第4部分中，

dotnet ef migrations add InitialCreate

is producing a migration file with incorrect column data types.

正在生成列数据类型不正确的迁移文件。

After running dotnet ef migrations add InitialCreate, the command should have taken the following Movie.cs class:

在运行DotNet Migrations Add InitialCreate之后，该命令应该具有以下Movie.cs类：

using System.ComponentModel.DataAnnotations;

namespace MvcMovie.Models;

public class Movie
{
    public int Id { get; set; }
    public string? Title { get; set; }
    [DataType(DataType.Date)]
    public DateTime ReleaseDate { get; set; }
    public string? Genre { get; set; }
    public decimal Price { get; set; }
}

And the expected output should have been a migration file Migrations/{time-stamp}_InitialCreate.cs, with the following content:

预期输出应该是包含以下内容的迁移文件Migrations/{time-stamp}_InitialCreate.cs：

using System;
using Microsoft.EntityFrameworkCore.Migrations;

#nullable disable

namespace MvcMovie.Migrations
{
    public partial class InitialCreate : Migration
    {
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.CreateTable(
                name: "Movie",
                columns: table => new
                {
                    Id = table.Column<int>(type: "int", nullable: false)
                        .Annotation("SqlServer:Identity", "1, 1"),
                    Title = table.Column<string>(type: "nvarchar(max)", nullable: true),
                    ReleaseDate = table.Column<DateTime>(type: "datetime2", nullable: false),
                    Genre = table.Column<string>(type: "nvarchar(max)", nullable: true),
                    Price = table.Column<decimal>(type: "decimal(18,2)", nullable: false)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_Movie", x => x.Id);
                });
        }

        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.DropTable(
                name: "Movie");
        }
    }
}

The actual output was:

实际产出为：

using System;
using Microsoft.EntityFrameworkCore.Migrations;

#nullable disable

namespace MvcMovie.Migrations
{
    /// <inheritdoc />
    public partial class InitialCreate : Migration
    {
        /// <inheritdoc />
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.CreateTable(
                name: "Movie",
                columns: table => new
                {
                    Id = table.Column<int>(type: "INTEGER", nullable: false)
                        .Annotation("Sqlite:Autoincrement", true),
                    Title = table.Column<string>(type: "TEXT", nullable: true),
                    ReleaseDate = table.Column<DateTime>(type: "TEXT", nullable: false),
                    Genre = table.Column<string>(type: "TEXT", nullable: true),
                    Price = table.Column<decimal>(type: "TEXT", nullable: false)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_Movie", x => x.Id);
                });
        }

        /// <inheritdoc />
        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.DropTable(
                name: "Movie");
        }
    }
}

As can be seen above, some properties like Price, produces a column of type TEXT instead of decimal(18,2).

如上所述，一些属性(如Price)会生成一个文本类型的列，而不是DECIMAL(18，2)类型。

Judging from your autoincement specification, it appears you are using SQLite - this does not support a decimal type, so it will fall back to using TEXT.

从您的自动增强规范来看，您似乎正在使用SQLite--这不支持DECIMAL类型，因此它将退回到使用文本。