批量注册IEntityTypeConfiguration<>实体框架核心
批量注册IEntityTypeConfiguration<>实体框架核心
提问于 2017-10-30 19:07:54
好的，所以我使用的是带有.Net内核的实体框架和代码优先迁移。这本身并不是问题，我只是想知道是否有人找到了更好的方法来做这件事。
目前我有很多像这样的实体类型配置
public class ExampleEntityConfiguration : IEntityTypeConfiguration<ExampleEntity>
{
public void Configure(EntityTypeBuilder<ExampleEntity> builder)
{
builder.Property(p => p.Id).ValueGeneratedNever();
// more options here
}
}并在我的dbcontext中注册它们，如下所示
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.ApplyConfiguration(new ExampleEntityConfiguration());
// lot's more configurations here
}有没有人遇到或知道一种注册所有IEntityTypeConfiguration接口的方法？
这看起来像是许多重复的代码，可以通过获取配置列表、循环它们并在上下文中应用来解决。我只是不知道从哪里开始获取存在于特定名称空间中的IEntityTypeConfiguration类的列表。
任何帮助/建议都是很棒的。
回答 6
Stack Overflow用户
回答已采纳
发布于 2017-10-30 19:31:53
它可以通过如下的反射来完成：
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
// get ApplyConfiguration method with reflection
var applyGenericMethod = typeof(ModelBuilder).GetMethod("ApplyConfiguration", BindingFlags.Instance | BindingFlags.Public);
// replace GetExecutingAssembly with assembly where your configurations are if necessary
foreach (var type in Assembly.GetExecutingAssembly().GetTypes()
.Where(c => c.IsClass && !c.IsAbstract && !c.ContainsGenericParameters))
{
// use type.Namespace to filter by namespace if necessary
foreach (var iface in type.GetInterfaces()) {
// if type implements interface IEntityTypeConfiguration<SomeEntity>
if (iface.IsConstructedGenericType && iface.GetGenericTypeDefinition() == typeof(IEntityTypeConfiguration<>)) {
// make concrete ApplyConfiguration<SomeEntity> method
var applyConcreteMethod = applyGenericMethod.MakeGenericMethod(iface.GenericTypeArguments[0]);
// and invoke that with fresh instance of your configuration type
applyConcreteMethod.Invoke(modelBuilder, new object[] {Activator.CreateInstance(type)});
break;
}
}
}
}Stack Overflow用户
发布于 2018-12-11 17:55:14
使用EF核心2.2+，它变得简单得多：
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
Assembly assemblyWithConfigurations = GetType().Assembly; //get whatever assembly you want
modelBuilder.ApplyConfigurationsFromAssembly(assemblyWithConfigurations);
}Stack Overflow用户
发布于 2017-11-13 19:15:26
@Evk kan的出色工作可以进一步封装在一个可重用的扩展方法中：
public static class ModelBuilderExtensions
{
public static void ApplyAllConfigurationsFromCurrentAssembly(this ModelBuilder modelBuilder, Assembly assembly, string configNamespace = "")
{
var applyGenericMethods = typeof(ModelBuilder).GetMethods( BindingFlags.Instance | BindingFlags.Public | BindingFlags.FlattenHierarchy);
var applyGenericApplyConfigurationMethods = applyGenericMethods.Where(m => m.IsGenericMethod && m.Name.Equals("ApplyConfiguration", StringComparison.OrdinalIgnoreCase));
var applyGenericMethod = applyGenericApplyConfigurationMethods.Where(m=>m.GetParameters().FirstOrDefault().ParameterType.Name== "IEntityTypeConfiguration`1").FirstOrDefault();
var applicableTypes = assembly
.GetTypes()
.Where(c => c.IsClass && !c.IsAbstract && !c.ContainsGenericParameters);
if (!string.IsNullOrEmpty(configNamespace))
{
applicableTypes = applicableTypes.Where(c => c.Namespace == configNamespace);
}
foreach (var type in applicableTypes)
{
foreach (var iface in type.GetInterfaces())
{
// if type implements interface IEntityTypeConfiguration<SomeEntity>
if (iface.IsConstructedGenericType && iface.GetGenericTypeDefinition() == typeof(IEntityTypeConfiguration<>))
{
// make concrete ApplyConfiguration<SomeEntity> method
var applyConcreteMethod = applyGenericMethod.MakeGenericMethod(iface.GenericTypeArguments[0]);
// and invoke that with fresh instance of your configuration type
applyConcreteMethod.Invoke(modelBuilder, new object[] { Activator.CreateInstance(type) });
Console.WriteLine("applied model " + type.Name);
break;
}
}
}
}
}并且可以这样调用：
public class ApiDbContext : DbContext
{
public DbSet<Customer> Customers { get; set; }
public ApiDbContext(DbContextOptions<ApiDbContext> options) : base(options) { }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.ApplyAllConfigurationsFromCurrentAssembly("MyRoot.Api.Entities.Configuration");
}
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
base.OnConfiguring(optionsBuilder);
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/47013752
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