零框架多租户设计方案

samples/MultiTenancySample/MultiTenancySample.SchemaIsolationService/EntityFrameworks/DataSeeding.cs

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+using Microsoft.EntityFrameworkCore;
+using MultiTenancySample.SchemaIsolationService.Entities;
+using MultiTenancySample.ServiceDefaults;
+
+namespace MultiTenancySample.SchemaIsolationService.EntityFrameworks
+{
+    public class DataSeeding(IDbContextFactory<SchemaIsolationDbContext> dbContext, ICurrentTenant currentTenant)
+    {
+        public async Task SeedDataAsync()
+        {
+            currentTenant.SetTenant("Tenant1");
+
+            SchemaIsolationDbContext dbContext1 = await dbContext.CreateDbContextAsync();
+
+            if (await dbContext1.Database.EnsureCreatedAsync())
+            {
+                await dbContext1.AddRangeAsync(new List<Product> {
+                    new() { Id = Guid.NewGuid(), Name = "Product1"},
+                    new() { Id = Guid.NewGuid(), Name = "Product3"},
+                    new() { Id = Guid.NewGuid(), Name = "Product5"}
+                });
+
+                await dbContext1.SaveChangesAsync();
+            }
+
+            currentTenant.SetTenant("Tenant2");
+
+            SchemaIsolationDbContext dbContext2 = dbContext.CreateDbContext();
+
+            await dbContext2.Database.MigrateAsync();
+
+            if (await dbContext2.Database.EnsureCreatedAsync())
+            {
+                await dbContext2.AddRangeAsync(new List<Product>
+                {
+                    new() { Id = Guid.NewGuid(), Name = "Product2"},
+                    new() { Id = Guid.NewGuid(), Name = "Product4"},
+                    new() { Id = Guid.NewGuid(), Name = "Product6"}
+                });
+
+                await dbContext2.SaveChangesAsync();
+            }
+        }
+    }
+}

samples/MultiTenancySample/MultiTenancySample.SchemaIsolationService/EntityFrameworks/SchemaIsolationDbContext.cs

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+using Microsoft.EntityFrameworkCore;
+using MultiTenancySample.SchemaIsolationService.Entities;
+using MultiTenancySample.ServiceDefaults;
+
+namespace MultiTenancySample.SchemaIsolationService.EntityFrameworks
+{
+    public class SchemaIsolationDbContext(DbContextOptions<SchemaIsolationDbContext> options, ICurrentTenant currentTenant) : DbContext(options)
+    {
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            modelBuilder.Entity<Product>().Property(p => p.Name).HasMaxLength(32);
+
+            // This scenario is not directly supported by EF Core and is not a recommended solution.
+            // https://learn.microsoft.com/en-us/ef/core/miscellaneous/multitenancy
+
+            modelBuilder.HasDefaultSchema(currentTenant.TenantId);
+
+            base.OnModelCreating(modelBuilder);
+        }
+    }
+}