一:給 C# 類庫 dll 新增配置檔案並讀取配置資訊

效果:

1.給類庫程式新增配置檔案,並命名為:類庫名.DLL.config

如上面效果圖,類庫為:API.dll ,那麼其對應的類庫配置檔案為:API.DLL.config

注意:執行時config檔案需跟類庫dll在同一級目錄下,不然讀取不到檔案

給配置檔案新增相關的配置資訊

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <!--Start 企業微信介面配置,預設不需要更改,企業微信屬於私有化的請修改  Start
 
-->
    <!--注意:連結必須是以'/'結尾-->
    <add key="Api" value="https://api.weixin.qq.com/" />
    <add key="QyApi" value="https://qyapi.weixin.qq.com/" />
    <add key="FileApi" value="http://file.api.weixin.qq.com/" />
    <add key="ApiMch" value="https://api.mch.weixin.qq.com/" />
   <!--
 
END 企業微信介面配置   END-->
  </appSettings>
</configuration>

2.建立APIConfHelper.cs 類,為讀取配置資訊封裝方法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.IO;
using System.Xml;
using System.Reflection;
using System.Diagnostics;
 
namespace API.Helpers
{
    /// <summary>    
    /// 支援AppSettings和ConnectionStrings節點 ,如需其他節點請自行擴充套件
    /// </summary>    
    public class APIConfHelper
    {
        //實現 AppSettings 節點的讀取          
        public static Hashtable AppSettings
        {
            get
            {
                return GetNameAndValue("appSettings", "key", "value");
            }
        }
        /// <summary>       
        /// 實現對AppSettings節點對應key的value設定        
        /// </summary>        
        /// <param name="keyNameValue"></param>        
        /// <param name="value"></param>     
        public static void SetAppSettings(string keyNameValue, string value)
        {
           
            SetNameAndValue("appSettings", "key", keyNameValue, value);
        }
        //實現 ConnectionStrings 節點的讀取           
        public static Hashtable ConnectionStrings
        {
            get
            {
                return GetNameAndValue("connectionStrings", "name", "connectionString");
            }
        }
        /// <summary>        
        /// 實現對connectionStrings 節點對應name的value設定        
        /// </summary>        
        /// <param name="keyNameValue"></param>        
        /// <param name="value"></param>        
        public static void SetConnectionStrings(string keyNameValue, string value)
        {
            SetNameAndValue("connectionStrings", "name", keyNameValue, value);
        }
        /// <summary>
        /// 實現對相應節點的對應節點對應key或者name對應value值的設定        
        /// </summary>        
        /// <param name="sectionTag">對應節點</param>        
        /// <param name="KeyOrName">對應key或者name</param>        
        /// <param name="keyNameValue">key或者name的值</param>        
        /// <param name="valueOrConnectionString">對應key或者name 的value值</param>        
        private static void SetNameAndValue(string sectionTag, string KeyOrName, string keyNameValue, string valueOrConnectionString)
        {
            string assemblyPath = Assembly.GetExecutingAssembly().GetName().CodeBase;
            //獲取執行專案當然DLL的路徑            
            assemblyPath = assemblyPath.Remove(0, 8);
            //去除路徑字首            
            string configUrl = assemblyPath + ".config";
            //新增.config字尾，得到配置檔案路徑           
            try
            {
                XmlDocument cfgDoc = new XmlDocument();
                cfgDoc.Load(configUrl);
                XmlNodeList nodes = cfgDoc.GetElementsByTagName(sectionTag);
                foreach (XmlNode node in nodes)
                {
                    foreach (XmlNode childNode in node.ChildNodes)
                    {
                        XmlAttributeCollection attributes = childNode.Attributes;
                        if (attributes!=null)
                        {
                            if (attributes.GetNamedItem(KeyOrName).InnerText == keyNameValue)
                            {
                                attributes.GetNamedItem("value").InnerText = valueOrConnectionString;
                            }
                        }
                    }
                }
                cfgDoc.Save(configUrl);
            }
            catch (FileNotFoundException es)
            {
                throw es;
            }
        }
        /// <summary>
        /// 根據節點名，子節點名，獲取指定值           
        /// </summary>           
        /// <param name="sectionTag">對應節點</param>           
        /// <param name="KeyOrName">key或者name</param>           
        /// <param name="valueOrConnectionString">key或者name的值</param>           
        /// <returns>key或者name對應value值</returns>           
        private static Hashtable GetNameAndValue(string sectionTag, string KeyOrName, string valueOrConnectionString)
        {
            Hashtable settings = new Hashtable(5);//初始化Hashtable             
            string assemblyPath = Assembly.GetExecutingAssembly().GetName().CodeBase;//獲取執行專案當前DLL的路徑            
            assemblyPath = assemblyPath.Remove(0, 8); //去除字首            
            string configUrl = assemblyPath + ".config"; //新增 .config 字尾，得到配置檔案路徑                
            XmlDocument cfgDoc = new XmlDocument();
            FileStream fs = null;
            try
            {
                fs = new FileStream(configUrl, FileMode.Open, FileAccess.Read);
                cfgDoc.Load(new XmlTextReader(fs));
                XmlNodeList nodes = cfgDoc.GetElementsByTagName(sectionTag);
                foreach (XmlNode node in nodes)
                {
                    foreach (XmlNode childNode in node.ChildNodes)
                    {
                        XmlAttributeCollection attributes = childNode.Attributes;
                        if (attributes!=null)
                        {
                            //為null不新增                            
                            settings.Add(attributes[KeyOrName].Value, attributes[valueOrConnectionString].Value);
                        }
                    }
                }
            }
            catch (FileNotFoundException es)
            {
                throw es;
            }
            finally
            {
                if (fs != null)
                {
                    fs.Close();
                }
            }
            return settings;
        }
    }
}

3.呼叫方法讀取節點配置資訊

        /// <summary>
        /// 基礎URL
        /// </summary>
        private static string baseUrl = APIConfHelper.AppSettings["Api"].ToString();