Asp.NETPersonnalBlogSystem/BLL/SettingService.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using Asp.NETPersonnalBlogSystem.DAL;
using Asp.NETPersonnalBlogSystem.Models;

namespace Asp.NETPersonnalBlogSystem.BLL
{
    /// <summary>
    /// 网站设置业务逻辑类
    /// 处理网站设置相关的业务操作
    /// </summary>
    public class SettingService
    {
        /// <summary>
        /// 获取网站设置值
        /// </summary>
        /// <param name="key">设置键名</param>
        /// <returns>设置值</returns>
        public string GetSetting(string key)
        {
            using (var db = new BlogDbContext())
            {
                var setting = db.SiteSettings.FirstOrDefault(s => s.SettingKey == key);
                return setting?.SettingValue;
            }
        }

        /// <summary>
        /// 获取网站设置值（带默认值）
        /// </summary>
        /// <param name="key">设置键名</param>
        /// <param name="defaultValue">默认值</param>
        /// <returns>设置值</returns>
        public string GetSetting(string key, string defaultValue)
        {
            var value = GetSetting(key);
            return string.IsNullOrEmpty(value) ? defaultValue : value;
        }

        /// <summary>
        /// 设置网站设置值
        /// </summary>
        /// <param name="key">设置键名</param>
        /// <param name="value">设置值</param>
        /// <returns>设置是否成功</returns>
        public bool SetSetting(string key, string value)
        {
            using (var db = new BlogDbContext())
            {
                var setting = db.SiteSettings.FirstOrDefault(s => s.SettingKey == key);
                if (setting == null)
                {
                    setting = new SiteSetting
                    {
                        SettingKey = key,
                        SettingValue = value,
                        UpdateTime = DateTime.Now
                    };
                    db.SiteSettings.Add(setting);