如何优雅的使用AbpSettings

在Abp中配置虽然使用方便，但是每个配置要先定义key，要去provider中定义，再最后使用key从ISetting中获取还是挺麻烦的一件事，

最主要是获取修改的时候，比如，修改用户配置，是从获取一批key/value来返回前端，并从前端提交修改保存就比较麻烦了。

很早之前做过一些尝试，如下：

https://www.cnblogs.com/crazyboy/p/8064387.html

但是那个时候比较菜也没怎么搞太清楚所以感觉也不太好用。

之前也想过使用定义配置类使用基类中注入的ISettingManager的方式来处理，如下

        public string Item
        {
            get { return this.SettingManager.GetSettingValue(nameof(Item)); }
            set { this.SettingManager.ChangeSettingForApplication(nameof(Item), value); }
        }

但是这样对配置类污染比较大，也就放弃了，前段时间在看Abp源代码的时候，突然想到，是否可以通过拦截器来代理配置类的get ,set方法来达到获取和修改配置的目的呢

于是便开始了配置的改造工作，首先，定义一个配置的接口来注册拦截器：

 1 using Abp.Dependency;
 2 
 3 namespace SKYS.Charger.Configuration
 4 {
 5     /// <summary>
 6     /// 配置类接口，要实现从SettingManager更新/获取数据，请所有属性用virtual标识
 7     /// </summary>
 8     public interface ISettings : ISingletonDependency
 9     {
10 
11     }
12 }

为了定义设置的一些配置，我们还需要定义一个特性用于设置的默认值/范围等：

using Abp.Configuration;
using System;

namespace SKYS.Charger.Configuration
{
    [AttributeUsage(AttributeTargets.Property)]
    public class AutoSettingDefinitionAttribute : Attribute
    {
        public object DefaultValue { get; private set; }

        public bool IsVisibleToClients { get; private set; }

        public SettingScopes Scopes { get; private set; }

        public AutoSettingDefinitionAttribute(object defaultValue, bool isVisibleToClients = true, SettingScopes scopes = SettingScopes.Application)
        {
            this.DefaultValue = defaultValue;
            this.IsVisibleToClients = isVisibleToClients;
            this.Scopes = scopes;
        }
    }
}

接下来，我们需要把所有继承至ISettings的设置类都注册到SettingProvider中，这里我直接使用的反射，从属性特性上读取设置的配置：

 1 using Abp.Configuration;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Reflection;
 5 
 6 namespace SKYS.Charger.Configuration
 7 {
 8     /// <summary>
 9     /// 
10     /// </summary>
11     public class AutoSettingsProvider : SettingProvider
12     {
13         public override IEnumerable<SettingDefinition> GetSettingDefinitions(SettingDefinitionProviderContext context)
14         {
15             var settings = new List<SettingDefinition>();
16 
17             var types = this.GetType().Assembly
18                                       .GetTypes()
19                                       .Where(t => t.IsClass && typeof(ISettings).IsAssignableFrom(t));
20 
21             foreach (var type in types)
22             {
23                 var scopes = SettingScopes.All;
24                 foreach (var p in type.GetProperties())
25                 {
26                     var key = AutoSettingsUtils.CreateSettingName(type, p.Name);
27                     var isVisibleToClients = false;
28                     var defaultValue = AutoSettingsUtils.GetDefaultValue(p.PropertyType);
29                     var attr = p.GetCustomAttribute<AutoSettingDefinitionAttribute>();
30                     if (attr != null)
31                     {
32                         scopes = attr.Scopes;
33                         defaultValue = attr.DefaultValue;
34                         isVisibleToClients = attr.IsVisibleToClients;
35                     }
36                     settings.Add(new SettingDefinition(
37                            name: key,
38                            defaultValue: defaultValue?.ToString(),
39                            scopes: scopes,
40                            isVisibleToClients: isVisibleToClients
41                             ));
42                 }
43             }
44 
45             return settings;
46         }
47     }
48 }

接下来定义一个Interceptor用于拦截设置类中属性的get/set方法，在拦截器中注入了ISettingManager及AbpSession用于获取和修改设置，在修改的时候如果scope支持User优先修改用户设置，然后是租户设置，最后是应用设置

 1 using Abp.Configuration;
 2 using Abp.Runtime.Session;
 3 using Castle.DynamicProxy;
 4 using SKYS.Charger.Utilities;
 5 
 6 namespace SKYS.Charger.Configuration
 7 {
 8     /// <summary>
 9     /// 自动配置拦截器，用于获取/修改配置值
10     /// </summary>
11     public class AutoSettingsInterceptor : IInterceptor
12     {
13         private readonly ISettingManager _settingManager;
14         private readonly ISettingDefinitionManager _settingDefinitionManager;
15         public IAbpSession AbpSession { get; set; }
16         public AutoSettingsInterceptor(ISettingManager settingManager, ISettingDefinitionManager settingDefinitionManager)
17         {
18             this._settingManager = settingManager;
19             this._settingDefinitionManager = settingDefinitionManager;
20             this.AbpSession = NullAbpSession.Instance;
21         }
22 
23         protected void PostProceed(IInvocation invocation)
24         {
25             var setFlag = "set_";
26             var getFlag = "get_";
27 
28             var isSet = invocation.Method.Name.StartsWith(setFlag);
29             var isGet = invocation.Method.Name.StartsWith(getFlag);
30             //非属性方法不处理
31             if (!isSet && !isGet)
32                 return;
33 
34             var pname = invocation.Method.Name.Replace(setFlag, "")
35                                               .Replace(getFlag, "");
36             var settingName = AutoSettingsUtils.CreateSettingName(invocation.TargetType, pname);
37             //配置 设置
38             if (isSet)
39             {
40                 var setting = this._settingDefinitionManager.GetSettingDefinition(settingName);
41                 this.ChangeSettingValue(setting, invocation.Arguments[0]?.ToString());
42             }
43             //配置 获取
44             else
45             {
46                 var val = this._settingManager.GetSettingValue(settingName);
47                 invocation.ReturnValue = ConvertHelper.ChangeType(val, invocation.Method.ReturnType);
48             }
49         }
50         protected void ChangeSettingValue(SettingDefinition settings, object value)
51         {
52             var val = value?.ToString();
53             if (settings.Scopes.HasFlag(SettingScopes.User) && this.AbpSession.UserId.HasValue)
54                 this._settingManager.ChangeSettingForUser(this.AbpSession.ToUserIdentifier(), settings.Name, val);
55             else if (settings.Scopes.HasFlag(SettingScopes.Tenant) && this.AbpSession.TenantId.HasValue)
56                 this._settingManager.ChangeSettingForTenant(this.AbpSession.TenantId.Value, settings.Name, val);
57             else if (settings.Scopes.HasFlag(SettingScopes.Application))
58                 this._settingManager.ChangeSettingForApplication(settings.Name, val);
59         }
60 
61         public void Intercept(IInvocation invocation)
62         {
63             invocation.Proceed();
64             this.PostProceed(invocation);
65         }
66     }
67 }

定义完以后，我们还需要注册我们的拦截器，这里我使用了一个Manager来注册，通过传入AbpModule中的Configuration来完成注册

 1 using Abp.Configuration.Startup;
 2 using Castle.Core;
 3 
 4 namespace SKYS.Charger.Configuration
 5 {
 6     public class AutoSettingsManager
 7     {
 8         public static void Initialize(IAbpStartupConfiguration configuration)
 9         {
10             configuration.IocManager.IocContainer.Kernel.ComponentRegistered += (key, handler) =>
11             {
12                 if (typeof(ISettings).IsAssignableFrom(handler.ComponentModel.Implementation))
13                 {
14                     handler.ComponentModel.Interceptors.Add(new InterceptorReference(typeof(AutoSettingsInterceptor)));
15                 }
16             };
17 
18 　　　　　　　//把自动属性的Provider注册
19             configuration.Settings.Providers.Add<AutoSettingsProvider>();
20         }
21     }
22 }

然后在你定义配置类型的Module的PreInitialize()中完成注册：

//自动配置初始化
            AutoSettingsManager.Initialize(Configuration);

到这里我们的工作基本上也就完成了，接下来我们就可以定义我们自己的设置类了，因为我们注入使用是类，所以定义的属性都需要加上virtual以便拦截器能正常工具

 1 using Abp.AutoMapper;
 2 using Abp.Configuration;
 3 
 4 namespace SKYS.Charger.Configuration.Settings
 5 {
 6     [AutoMap(typeof(AppSettings))]
 7     public class AppSettings : ISettings
 8     {
 9         [AutoSettingDefinition("SKYS.Charger")]
10         public virtual string SystemName { get; set; }
11 
12         [AutoSettingDefinition(20)]
13         public virtual int PageSize { get; set; }
14 
15         /// <summary>
16         /// 得现手续费
17         /// </summary>
18         [AutoSettingDefinition(0.02)]
19         public virtual decimal TakeServiceFeeRate { get; set; }
20     }
21 }

在任意使用的地方，直接注入即可使用，并且只要是注入的配置类型，设置它的属性即可完成修改并保存到数据库，获取也是直接从ISettingManager中获取值，再配合前端修改的时候就方便多了

 1 namespace SKYS.Charger.Configuration
 2 {
 3     public class ConfigurationAppService : ApplicationService
 4     {
 5         private readonly AppSettings _appSettings;
 6         public ConfigurationAppService(AppSettings appSettings)
 7         {
 8             this._appSettings = appSettings;
 9         }
10 
11         /// <summary>
12         /// 获取系统配置
13         /// </summary>
14         public async Task<AppSettings> GetSystemSettings()
15         {
16             return await Task.FromResult(_appSettings);
17         }
18         /// <summary>
19         /// 修改系统配置
20         /// </summary>
21         [ManagerAuthorize]
22         public async Task ChangeSystemSettings(AppSettings appSettings)
23         {
24             this.ObjectMapper.Map(appSettings, _appSettings);
25 
26             await Task.CompletedTask;
27         }
28     }
29 }

是不是比原来的使用方式简单了很多呢，因为是所有配置类型都是ISingletonDependency在不方便的地方还可以直接使用IocManager.Instance.Resolve<AppSettings>()直接获取：

 1     public class PagedRequestFilter : IShouldNormalize
 2     {
 3         //public ISettingManager SettingManager { get; set; }
 4 
 5         public const int DefaultSize = 20;
 6 
 7         //[Range(1, 10000)]
 8         public int Page { get; set; }
 9 
10         //[Range(1,100)]
11         public int Size { get; set; }
12 
13         public void Normalize()
14         {
15             if (this.Page <= 0)
16                 this.Page = 1;
17             if (this.Size <= 0)
18             {
19                 var appSettings = IocManager.Instance.Resolve<AppSettings>();
20                 this.Size = appSettings.PageSize;
21             }
22         }
23     }

最后附上中间使用过的两个工具类AutoSettingsUtils和ConvertHelper

    public static class AutoSettingsUtils
    {
        public static string CreateSettingName(Type type, string propertyName)
        {
            return $"{type.Name}.{propertyName}";
        }

        public static object GetDefaultValue(Type targetType)
        {
            return targetType.IsValueType ? Activator.CreateInstance(targetType) : null;
        }
    }

View Code

 1     /// <summary>
 2     /// 数据转换帮助类
 3     /// </summary>
 4     public static class ConvertHelper
 5     {
 6         #region = ChangeType =
 7         public static object ChangeType(object obj, Type conversionType)
 8         {
 9             return ChangeType(obj, conversionType, Thread.CurrentThread.CurrentCulture);
10         }
11         public static object ChangeType(object obj, Type conversionType, IFormatProvider provider)
12         {
13             #region Nullable
14             Type nullableType = Nullable.GetUnderlyingType(conversionType);
15             if (nullableType != null)
16             {
17                 if (obj == null)
18                 {
19                     return null;
20                 }
21                 return Convert.ChangeType(obj, nullableType, provider);
22             }
23             #endregion
24             if (typeof(System.Enum).IsAssignableFrom(conversionType))
25             {
26                 return Enum.Parse(conversionType, obj.ToString());
27             }
28             return Convert.ChangeType(obj, conversionType, provider);
29         }
30         #endregion
31     }

View Code

本文链接：https://www.cnblogs.com/crazyboy/p/12497279.html

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