前言

  VS给我们提供非常方便的程序配置文件管理功能，可视化操作，还是非常棒的，但一些高级操作仍需要手动写代码，之前我想要将程序的user.config存储路径改为其运行目录，发现默认不可以，所以打算造一下轮子，自己用代码实现，但是又发现轮子别人有，不多说，复制粘贴就用起来，顺便做个记录，真香。

SettingsProvider

  来自参考资料2中的代码，这里感谢kenvix，需要的朋友自行魔改。

• GetAppSettingsPath() 的返回值为 设置存储目录
• GetAppSettingsFilename() 的返回值为 设置文件名
• SkipRoamingCheck 是否跳过漫游属性检测，无特殊需求建议为 true

using System;
using System.Collections;
using System.Configuration;
using System.Collections.Specialized;
using System.Xml;
using System.Windows.Forms;
using System.IO;
namespace Kenvix
{
    public class AppConfigProvider : SettingsProvider
    {
        const string SettingsRootNode = "Settings"; // XML Root Node
        const bool SkipRoamingCheck = false; //if true, all settings will be forcely marked as Roaming 
        /// <summary>
        /// Used to determine where to store the settings
        /// </summary>
        /// <returns></returns>
        public virtual string GetAppSettingsPath()
        {
            return (new FileInfo(Application.ExecutablePath)).DirectoryName; //Use application path
        }
        /// <summary>
        /// Used to determine the filename to store the settings
        /// </summary>
        /// <returns></returns>
        public virtual string GetAppSettingsFilename()
        {
            return ApplicationName + ".config";
        }
        public override void Initialize(string name, NameValueCollection col)
        {
            base.Initialize(ApplicationName, col);
        }
        public override string ApplicationName
        {
            get
            {
                return Application.ProductName;
            }
            set { }
        }
        /// <summary>
        /// Iterate through the settings to be stored
        /// Only dirty settings are included in propvals, and only ones relevant to this provider
        /// </summary>
        /// <param name="context"></param>
        /// <param name="propvals"></param>
        public override void SetPropertyValues(SettingsContext context, SettingsPropertyValueCollection propvals)
        {
            foreach (SettingsPropertyValue propval in propvals)
                SetValue(propval);
            SettingsXML.Save(Path.Combine(GetAppSettingsPath(), GetAppSettingsFilename()));
        }
        public override SettingsPropertyValueCollection GetPropertyValues(SettingsContext context, SettingsPropertyCollection props)
        {
            // Create new collection of values
            SettingsPropertyValueCollection values = new SettingsPropertyValueCollection();
            // Iterate through the settings to be retrieved
            foreach (SettingsProperty setting in props)
            {
                SettingsPropertyValue value = new SettingsPropertyValue(setting);
                value.IsDirty = false;
                value.SerializedValue = GetValue(setting);
                values.Add(value);
            }
            return values;
        }
        private XmlDocument m_SettingsXML = null;
        private XmlDocument SettingsXML
        {
            get
            {
                // If we dont hold an xml document, try opening one.  
                // If it doesnt exist then create a new one ready.
                if (m_SettingsXML == null)
                {
                    m_SettingsXML = new XmlDocument();
                    try
                    {
                        m_SettingsXML.Load(Path.Combine(GetAppSettingsPath(), GetAppSettingsFilename()));
                    }
                    catch (Exception)
                    {
                        // Create new document
                        XmlDeclaration dec = m_SettingsXML.CreateXmlDeclaration("1.0", "utf-8", string.Empty);
                        m_SettingsXML.AppendChild(dec);
                        XmlNode nodeRoot;
                        nodeRoot = m_SettingsXML.CreateNode(XmlNodeType.Element, SettingsRootNode, "");
                        m_SettingsXML.AppendChild(nodeRoot);
                    }
                }
                return m_SettingsXML;
            }
        }
        private string GetValue(SettingsProperty setting)
        {
            string ret = "";
            try
            {
                if (IsRoaming(setting))
                    ret = SettingsXML.SelectSingleNode(SettingsRootNode + "/" + setting.Name).InnerText;
                else
                    ret = SettingsXML.SelectSingleNode(SettingsRootNode + "/" + Environment.MachineName + "/" + setting.Name).InnerText;
            }
            catch (Exception)
            {
                if (setting.DefaultValue != null)
                    ret = setting.DefaultValue.ToString();
                else
                    ret = "";
            }
            return ret;
        }
        private void SetValue(SettingsPropertyValue propVal)
        {
            XmlElement MachineNode;
            XmlElement SettingNode;
            // Determine if the setting is roaming.
            // If roaming then the value is stored as an element under the root
            // Otherwise it is stored under a machine name node 
            try
            {
                if (IsRoaming(propVal.Property))
                    SettingNode = (XmlElement)SettingsXML.SelectSingleNode(SettingsRootNode + "/" + propVal.Name);
                else
                    SettingNode = (XmlElement)SettingsXML.SelectSingleNode(SettingsRootNode + "/" + Environment.MachineName + "/" + propVal.Name);
            }
            catch (Exception)
            {
                SettingNode = null;
            }
            // Check to see if the node exists, if so then set its new value
            if (SettingNode != null)
                SettingNode.InnerText = propVal.SerializedValue.ToString();
            else if (IsRoaming(propVal.Property))
            {
                // Store the value as an element of the Settings Root Node
                SettingNode = SettingsXML.CreateElement(propVal.Name);
                SettingNode.InnerText = propVal.SerializedValue.ToString();
                SettingsXML.SelectSingleNode(SettingsRootNode).AppendChild(SettingNode);
            }
            else
            {
                // Its machine specific, store as an element of the machine name node,
                // creating a new machine name node if one doesnt exist.
                try
                {
                    MachineNode = (XmlElement)SettingsXML.SelectSingleNode(SettingsRootNode + "/" + Environment.MachineName);
                }
                catch (Exception)
                {
                    MachineNode = SettingsXML.CreateElement(Environment.MachineName);
                    SettingsXML.SelectSingleNode(SettingsRootNode).AppendChild(MachineNode);
                }
                if (MachineNode == null)
                {
                    MachineNode = SettingsXML.CreateElement(Environment.MachineName);
                    SettingsXML.SelectSingleNode(SettingsRootNode).AppendChild(MachineNode);
                }
                SettingNode = SettingsXML.CreateElement(propVal.Name);
                SettingNode.InnerText = propVal.SerializedValue.ToString();
                MachineNode.AppendChild(SettingNode);
            }
        }
        /// <summary>
        /// Determine if the setting is marked as Roaming
        /// </summary>
        /// <param name="prop"></param>
        /// <returns></returns>
        private bool IsRoaming(SettingsProperty prop)
        {
            if (SkipRoamingCheck) return true;
            foreach (DictionaryEntry d in prop.Attributes)
            {
                Attribute a = (Attribute)d.Value;
                if (a is SettingsManageabilityAttribute)
                    return true;
            }
            return false;
        }
    }
}

参考资料

https://classpattern.com/customsettingsprovider-csharp
https://kenvix.com/post/csharp-custom-appsettings-path/
https://msdn.microsoft.com/zh-cn/library/a65txexh.aspx

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