SeedData 怎么写 数据库上下文 怎么拿到
依赖注入
| builder.Services.AddDbContext<BlazorMovieContext>(options => |
| options.UseSqlServer( |
| builder.Configuration.GetConnectionString("RazorPagesMovieContext") |
| ?? throw new InvalidOperationException( |
| "Connection string 'RazorPagesMovieContext' not found." |
| ) |
| ) |
| ); |
DbContext
| public class BlazorMovieContext : DbContext |
| { |
| public BlazorMovieContext(DbContextOptions<BlazorMovieContext> options) |
| : base(options) { } |
| |
| public DbSet<BlazorMovie.Models.Movie> Movie { get; set; } = default!; |
| } |
手动拿到数据库上下文
| |
| using var context = new BlazorMovieContext(serviceProvider.GetRequiredService<DbContextOptions<BlazorMovieContext>>()); |
SeedData.cs
| public static class SeedData |
| { |
| public static void Initialize(IServiceProvider serviceProvider) |
| { |
| using var context = new BlazorMovieContext( |
| serviceProvider.GetRequiredService<DbContextOptions<BlazorMovieContext>>() |
| ); |
| |
| if (context == null || context.Movie == null) |
| { |
| throw new ArgumentNullException("Null RazorPagesMovieContext"); |
| } |
| |
| |
| if (context.Movie.Any()) |
| { |
| return; |
| } |
| |
| context.Movie.AddRange( |
| new Movie |
| { |
| Title = "When Harry Met Sally", |
| ReleaseDate = DateOnly.Parse("1989-2-12"), |
| Genre = "Romantic Comedy", |
| Price = 7.99M |
| }, |
| new Movie |
| { |
| Title = "Ghostbusters ", |
| ReleaseDate = DateOnly.Parse("1984-3-13"), |
| Genre = "Comedy", |
| Price = 8.99M |
| }, |
| new Movie |
| { |
| Title = "Ghostbusters 2", |
| ReleaseDate = DateOnly.Parse("1986-2-23"), |
| Genre = "Comedy", |
| Price = 9.99M |
| }, |
| new Movie |
| { |
| Title = "Rio Bravo", |
| ReleaseDate = DateOnly.Parse("1959-4-15"), |
| Genre = "Western", |
| Price = 3.99M |
| } |
| ); |
| context.SaveChanges(); |
| } |
| } |
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2022-11-27 todolist 外观模式