Resolved #2159: Create Configuration setting value provider.

docs/en/Modules/Setting-Management.md

@@ -73,9 +73,10 @@ Setting values are cached using the [distributed cache](../Caching.md) system. A
 
 ## Setting Management Providers
 
-Setting Management module is extensible, just like the [setting system](../Settings.md).  You can extend it by defining setting management providers. There are four pre-built setting management providers registered by the order below:
+Setting Management module is extensible, just like the [setting system](../Settings.md).  You can extend it by defining setting management providers. There are 5 pre-built setting management providers registered by the order below:
 
 * `DefaultValueSettingManagementProvider`: Gets the value from the default value of the setting definition. It can not set the default value since default values are hard-coded on the setting definition.
+* `ConfigurationSettingManagementProvider`: Gets the value from the [IConfiguration service](Configuration.md). It can not set the configuration value because it is not possible to change the configuration values on runtime.
 * `GlobalSettingManagementProvider`: Gets or sets the global (system-wide) value for a setting.
 * `TenantSettingManagementProvider`: Gets or sets the setting value for a tenant.
 * `UserSettingManagementProvider`: Gets the setting value for a user.

docs/en/Settings.md

@@ -106,9 +106,10 @@ Setting system is extensible, you can extend it by defining setting value provid
 
 `ISettingProvider` uses the setting value providers to obtain a setting value. It fallbacks to the next value provider if a value provider can not get the setting value.
 
-There are four pre-built setting value providers registered by the order below:
+There are 5 pre-built setting value providers registered by the order below:
 
 * `DefaultValueSettingValueProvider`: Gets the value from the default value of the setting definition, if set (see the SettingDefinition section above).
+* `ConfigurationSettingValueProvider`: Gets the value from the [IConfiguration service](Configuration.md).
 * `GlobalSettingValueProvider`: Gets the global (system-wide) value for a setting, if set.
 * `TenantSettingValueProvider`: Gets the setting value for the current tenant, if set (see the [multi-tenancy](Multi-Tenancy.md) document).
 * `UserSettingValueProvider`: Gets the setting value for the current user, if set (see the [current user](CurrentUser.md) document).

framework/src/Volo.Abp.Settings/Volo/Abp/Settings/AbpSettingsModule.cs

@@ -25,6 +25,7 @@ namespace Volo.Abp.Settings
             Configure<AbpSettingOptions>(options =>
             {
                 options.ValueProviders.Add<DefaultValueSettingValueProvider>();
+                options.ValueProviders.Add<ConfigurationSettingValueProvider>();
                 options.ValueProviders.Add<GlobalSettingValueProvider>();
                 options.ValueProviders.Add<TenantSettingValueProvider>();
                 options.ValueProviders.Add<UserSettingValueProvider>();

framework/src/Volo.Abp.Settings/Volo/Abp/Settings/ConfigurationSettingValueProvider.cs

@@ -0,0 +1,27 @@
+using System.Threading.Tasks;
+using Microsoft.Extensions.Configuration;
+using Volo.Abp.DependencyInjection;
+
+namespace Volo.Abp.Settings
+{
+    public class ConfigurationSettingValueProvider : ISettingValueProvider, ITransientDependency
+    {
+        public const string ConfigurationNamePrefix = "Settings:";
+
+        public const string ProviderName = "C";
+
+        public string Name => ProviderName;
+
+        protected IConfiguration Configuration { get; }
+
+        public ConfigurationSettingValueProvider(IConfiguration configuration)
+        {
+            Configuration = configuration;
+        }
+
+        public virtual Task<string> GetOrNullAsync(SettingDefinition setting)
+        {
+            return Task.FromResult(Configuration[ConfigurationNamePrefix + setting.Name]);
+        }
+    }
+}

modules/setting-management/src/Volo.Abp.SettingManagement.Domain/Volo/Abp/SettingManagement/AbpSettingManagementDomainModule.cs

@@ -18,6 +18,7 @@ namespace Volo.Abp.SettingManagement
             Configure<SettingManagementOptions>(options =>
             {
                 options.Providers.Add<DefaultValueSettingManagementProvider>();
+                options.Providers.Add<ConfigurationSettingManagementProvider>();
                 options.Providers.Add<GlobalSettingManagementProvider>();
                 options.Providers.Add<TenantSettingManagementProvider>();
                 options.Providers.Add<UserSettingManagementProvider>();

modules/setting-management/src/Volo.Abp.SettingManagement.Domain/Volo/Abp/SettingManagement/ConfigurationSettingManagementProvider.cs

@@ -0,0 +1,34 @@
+using System.Threading.Tasks;
+using Microsoft.Extensions.Configuration;
+using Volo.Abp.DependencyInjection;
+using Volo.Abp.Settings;
+
+namespace Volo.Abp.SettingManagement
+{
+    public class ConfigurationSettingManagementProvider : ISettingManagementProvider, ITransientDependency
+    {
+        public string Name => ConfigurationSettingValueProvider.ProviderName;
+
+        protected IConfiguration Configuration { get; }
+
+        public ConfigurationSettingManagementProvider(IConfiguration configuration)
+        {
+            Configuration = configuration;
+        }
+
+        public Task<string> GetOrNullAsync(SettingDefinition setting, string providerKey)
+        {
+            return Task.FromResult(Configuration[ConfigurationSettingValueProvider.ConfigurationNamePrefix + setting.Name]);
+        }
+
+        public Task SetAsync(SettingDefinition setting, string value, string providerKey)
+        {
+            throw new AbpException($"Can not set a setting value to the application configuration.");
+        }
+
+        public Task ClearAsync(SettingDefinition setting, string providerKey)
+        {
+            throw new AbpException($"Can not set a setting value to the application configuration.");
+        }
+    }
+}

modules/setting-management/src/Volo.Abp.SettingManagement.Domain/Volo/Abp/SettingManagement/ConfigurationValueSettingManagerExtensions.cs

@@ -0,0 +1,20 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using JetBrains.Annotations;
+using Volo.Abp.Settings;
+
+namespace Volo.Abp.SettingManagement
+{
+    public static class ConfigurationValueSettingManagerExtensions
+    {
+        public static Task<string> GetOrNullConfigurationAsync(this ISettingManager settingManager, [NotNull] string name, bool fallback = true)
+        {
+            return settingManager.GetOrNullAsync(name, ConfigurationSettingValueProvider.ProviderName, null, fallback);
+        }
+
+        public static Task<List<SettingValue>> GetAllConfigurationAsync(this ISettingManager settingManager, bool fallback = true)
+        {
+            return settingManager.GetAllAsync(ConfigurationSettingValueProvider.ProviderName, null, fallback);
+        }
+    }
+}

modules/setting-management/test/Volo.Abp.SettingManagement.Tests/Volo/Abp/SettingManagement/DefaultValueSettingManagementProvider_Tests.cs

@@ -1,7 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
-using System.Threading.Tasks;
+using System.Threading.Tasks;
 using Shouldly;
 using Volo.Abp.Settings;
 using Xunit;