Introduce AspNetCoreMultiTenancyOptions.

src/Volo.Abp.AspNetCore.MultiTenancy/Volo/Abp/AspNetCore/MultiTenancy/AbpAspNetCoreMultiTenancyConsts.cs

@@ -1,8 +0,0 @@
-namespace Volo.Abp.AspNetCore.MultiTenancy
-{
-    public static class AbpAspNetCoreMultiTenancyConsts
-    {
-        //TODO: Get from an option instead of a constant!
-        public const string TenantIdKey = "__tenantId";
-    }
-}

src/Volo.Abp.AspNetCore.MultiTenancy/Volo/Abp/AspNetCore/MultiTenancy/AspNetCoreMultiTenancyOptions.cs

@@ -0,0 +1,15 @@
+namespace Volo.Abp.AspNetCore.MultiTenancy
+{
+    public class AspNetCoreMultiTenancyOptions
+    {
+        /// <summary>
+        /// Default: "__tenantId".
+        /// </summary>
+        public string TenantIdKey { get; set; }
+
+        public AspNetCoreMultiTenancyOptions()
+        {
+            TenantIdKey = "__tenantId";
+        }
+    }
+}

src/Volo.Abp.AspNetCore.MultiTenancy/Volo/Abp/AspNetCore/MultiTenancy/CookieTenantResolver.cs

@@ -6,7 +6,7 @@ namespace Volo.Abp.AspNetCore.MultiTenancy
     {
         protected override string GetTenantIdFromHttpContextOrNull(HttpContext httpContext)
         {
-            return httpContext.Request.Cookies[AbpAspNetCoreMultiTenancyConsts.TenantIdKey];
+            return httpContext.Request.Cookies[Options.TenantIdKey];
         }
     }
 }

src/Volo.Abp.AspNetCore.MultiTenancy/Volo/Abp/AspNetCore/MultiTenancy/HeaderTenantResolver.cs

@@ -7,7 +7,7 @@ namespace Volo.Abp.AspNetCore.MultiTenancy
         protected override string GetTenantIdFromHttpContextOrNull(HttpContext httpContext)
         {
             //TODO: Get first one if provided multiple values and write a log
-            return httpContext.Request.Headers[AbpAspNetCoreMultiTenancyConsts.TenantIdKey];
+            return httpContext.Request.Headers[Options.TenantIdKey];
         }
     }
 }

src/Volo.Abp.AspNetCore.MultiTenancy/Volo/Abp/AspNetCore/MultiTenancy/HttpTenantResolverBase.cs

@@ -1,4 +1,6 @@
 using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
 using Volo.Abp.MultiTenancy;
 using Volo.ExtensionMethods;
 
@@ -6,14 +8,23 @@ namespace Volo.Abp.AspNetCore.MultiTenancy
 {
     public abstract class HttpTenantResolverBase : ITenantResolver
     {
+        protected AspNetCoreMultiTenancyOptions Options { get; private set; }
+
         public virtual void Resolve(ITenantResolveContext context)
         {
+            Options = context.ServiceProvider.GetRequiredService<IOptions<AspNetCoreMultiTenancyOptions>>().Value;
+
             var httpContext = context.GetHttpContext();
             if (httpContext == null)
             {
                 return;
             }
 
+            ResolveFromHttpContext(context, httpContext);
+        }
+
+        private void ResolveFromHttpContext(ITenantResolveContext context, HttpContext httpContext)
+        {
             var tenantId = GetTenantIdFromHttpContextOrNull(httpContext);
             if (!tenantId.IsNullOrEmpty())
             {

src/Volo.Abp.AspNetCore.MultiTenancy/Volo/Abp/AspNetCore/MultiTenancy/QueryStringTenantResolver.cs

@@ -11,7 +11,7 @@ namespace Volo.Abp.AspNetCore.MultiTenancy
                 return null;
             }
 
-            return httpContext.Request.Query[AbpAspNetCoreMultiTenancyConsts.TenantIdKey];
+            return httpContext.Request.Query[Options.TenantIdKey];
         }
     }
 }

src/Volo.Abp.AspNetCore.MultiTenancy/Volo/Abp/AspNetCore/MultiTenancy/RouteTenantResolver.cs

@@ -8,7 +8,7 @@ namespace Volo.Abp.AspNetCore.MultiTenancy
     {
         protected override string GetTenantIdFromHttpContextOrNull(HttpContext httpContext)
         {
-            var tenantId = httpContext.GetRouteValue(AbpAspNetCoreMultiTenancyConsts.TenantIdKey);
+            var tenantId = httpContext.GetRouteValue(Options.TenantIdKey);
             if (tenantId == null)
             {
                 return null;

test/Volo.Abp.AspNetCore.MultiTenancy.Tests/Volo/Abp/AspNetCore/MultiTenancy/AspNetCoreMultiTenancy_Tests.cs

@@ -1,5 +1,7 @@
 using System.Collections.Generic;
 using System.Threading.Tasks;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
 using Microsoft.Net.Http.Headers;
 using Shouldly;
 using Volo.Abp.AspNetCore.App;
@@ -9,6 +11,13 @@ namespace Volo.Abp.AspNetCore.MultiTenancy
 {
     public class AspNetCoreMultiTenancy_Tests : AppTestBase
     {
+        private readonly AspNetCoreMultiTenancyOptions _options;
+
+        public AspNetCoreMultiTenancy_Tests()
+        {
+            _options = ServiceProvider.GetRequiredService<IOptions<AspNetCoreMultiTenancyOptions>>().Value;
+        }
+
         [Fact]
         public async Task Should_Use_Host_If_Tenant_Is_Not_Specified()
         {
@@ -21,7 +30,7 @@ namespace Volo.Abp.AspNetCore.MultiTenancy
         {
             const string testTenantId = "42";
 
-            var result = await GetResponseAsObjectAsync<Dictionary<string, string>>($"http://abp.io?{AbpAspNetCoreMultiTenancyConsts.TenantIdKey}={testTenantId}");
+            var result = await GetResponseAsObjectAsync<Dictionary<string, string>>($"http://abp.io?{_options.TenantIdKey}={testTenantId}");
             result["TenantId"].ShouldBe(testTenantId);
         }
 
@@ -30,7 +39,7 @@ namespace Volo.Abp.AspNetCore.MultiTenancy
         {
             const string testTenantId = "42";
 
-            Client.DefaultRequestHeaders.Add(AbpAspNetCoreMultiTenancyConsts.TenantIdKey, testTenantId);
+            Client.DefaultRequestHeaders.Add(_options.TenantIdKey, testTenantId);
 
             var result = await GetResponseAsObjectAsync<Dictionary<string, string>>("http://abp.io");
             result["TenantId"].ShouldBe(testTenantId);
@@ -41,7 +50,7 @@ namespace Volo.Abp.AspNetCore.MultiTenancy
         {
             const string testTenantId = "42";
             
-            Client.DefaultRequestHeaders.Add("Cookie", new CookieHeaderValue(AbpAspNetCoreMultiTenancyConsts.TenantIdKey, testTenantId).ToString());
+            Client.DefaultRequestHeaders.Add("Cookie", new CookieHeaderValue(_options.TenantIdKey, testTenantId).ToString());
 
             var result = await GetResponseAsObjectAsync<Dictionary<string, string>>("http://abp.io");
             result["TenantId"].ShouldBe(testTenantId);