零框架多租户设计方案

samples/MultiTenancySample/MultiTenancySample.ServiceDefaults/TenantIdProvider.cs

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+using Microsoft.AspNetCore.Http;
+
+namespace MultiTenancySample.ServiceDefaults
+{
+    public class TenantIdProvider(IHttpContextAccessor httpContextAccessor) : ITenantIdProvider
+    {
+        public async Task<string?> GetTenantIdAsync()
+        {
+            HttpContext httpContext = httpContextAccessor.HttpContext ?? new DefaultHttpContext();
+
+            const string tenantKey = "tenant";
+
+            if (httpContext.Request.Headers.TryGetValue(tenantKey, out var headerValues))
+            {
+                return headerValues.First();
+            }
+
+            if (httpContext.Request.Query.TryGetValue(tenantKey, out var queryValues))
+            {
+                return queryValues.First();
+            }
+
+            if (httpContext.Request.Cookies.TryGetValue(tenantKey, out var cookieValue))
+            {
+                return cookieValue;
+            }
+
+            if (httpContext.Request.RouteValues.TryGetValue(tenantKey, out var routeValue))
+            {
+                return routeValue?.ToString();
+            }
+
+            return await Task.FromResult<string?>(null);
+        }
+    }
+}