Entity Framework Core：列、参数或变量 #4：找不到数据类型 bool

Question

我对这个问题有点困惑，尽管它是不言自明的。我确实尝试将数据类型从 bool 更改为 bit，但是，bit 数据类型呈现白色并且有红色波浪。您会在下面找到我的代码，其中数据类型已更改为位。注意，这是在我运行 add-migration 命令并查看迁移代码之后。

migrationBuilder.CreateTable(
            name: "AspNetUsers",
            columns: table => new
            {
                Id = table.Column<string>(nullable: false),
                UserName = table.Column<string>(maxLength: 256, nullable: true),
                NormalizedUserName = table.Column<string>(maxLength: 256, nullable: true),
                Email = table.Column<string>(maxLength: 256, nullable: true),
                NormalizedEmail = table.Column<string>(maxLength: 256, nullable: true),
                EmailConfirmed = table.Column<bit>(nullable: false),
                PasswordHash = table.Column<string>(nullable: true),
                SecurityStamp = table.Column<string>(nullable: true),
                ConcurrencyStamp = table.Column<string>(nullable: true),
                PhoneNumber = table.Column<string>(nullable: true),
                PhoneNumberConfirmed = table.Column<bit>(nullable: false),
                TwoFactorEnabled = table.Column<bit>(nullable: false),
                LockoutEnd = table.Column<DateTimeOffset>(nullable: true),
                LockoutEnabled = table.Column<bit>(nullable: false),
                AccessFailedCount = table.Column<int>(nullable: false),
                FirstName = table.Column<string>(nullable: true),
                LastName = table.Column<string>(nullable: true)
            },

Answer 1

使用 Entity Framework Core 时请查看mapping between C# data type to SQL Server column data type。

C# bool 类型将映射到 SQL Server bit 类型。因此，在 C# 中，我们必须使用 bool 类型，而不是 bit 类型，但您可以将 type 属性设置为 bit。像这样的代码：

        migrationBuilder.CreateTable(
            name: "TestTables",
            columns: table => new
            {
                Id = table.Column<int>(type: "int", nullable: false)
                    .Annotation("SqlServer:Identity", "1, 1"),
                Name = table.Column<string>(type: "nvarchar(max)", nullable: true),
                Email = table.Column<string>(type: "nvarchar(max)", nullable: true),
                EmailConfirmed = table.Column<bool>(type: "bit", nullable: false),
                LockoutEnd = table.Column<DateTime>(type: "datetime2", nullable: false),
                LockoutEnabled = table.Column<bool>(type: "bit", nullable: false)
            },
            constraints: table =>
            {
                table.PrimaryKey("PK_TestTables", x => x.Id);
            });

SQL server 数据库结果如下：