如何获取网络配置位置元素？答案

【问题标题】：How get web config location element?如何获取网络配置位置元素？
【发布时间】：2011-05-08 13:52:11
【问题描述】：

如何获取网络配置位置元素？

ConfigurationManager.GetSection("appSettings") returns Okay

ConfigurationManager.GetSection("location") return null

I.E. ...

<location path="FOLDER/Page2.aspx">
...
</location>

【问题讨论】：

如果您可以粘贴配置文件的全部内容，这可能会有所帮助。

标签： c# configuration web-config

【解决方案1】：

您收到错误的原因是因为在 .NET 中，自定义应用配置部分（例如示例中的“位置”部分）要求您提供自定义配置部分处理程序。

你需要使用的主界面是IConfigurationSectionHandler

这是一篇关于如何创建 custom configuration handler 的 MSDN 文章。

【讨论】：

【解决方案2】：

这有帮助吗？

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
ConfigurationLocationCollection myLocationCollection = config.Locations;
foreach (ConfigurationLocation myLocation in myLocationCollection)
{
    Console.WriteLine("Location Path: {0}", myLocation.Path);
    Configuration myLocationConfiguration = myLocation.OpenConfiguration();
    Console.WriteLine("Location Configuration File Path: {0}",              myLocationConfiguration.FilePath);
}
Console.WriteLine("Done...");
Console.ReadLine();

取自here

【讨论】：

这将适用于独立的可执行文件，即从 app.config 读取，但它不适用于 web.config。在这种情况下，第一行应替换为Configuration config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~");

【解决方案3】：

这是因为appSettings 是 .NET 应用程序中的已知（默认）配置部分。如果你想使用自己的配置部分，你必须create it。

【讨论】：

【解决方案4】：

不确定这是否正是您想要的，但您可以像这样在 web.config 位置元素中获取部分...

AuthorizationSection pageAuthorizationSection = (AuthorizationSection)WebConfigurationManager.GetSection("system.web/authorizati‌on", "FOLDER/Page2.aspx");

【讨论】：

【解决方案5】：

我想改进尼尔的回答：许多人说不建议在运行时修改 web.config。但这里是如何做到这一点的代码。

   //The path where the web.config file is located
   string path = "~/Administrator/";

   //Collections of aspx page names separated by a comma. 
   //Example content in a textbox: Default.aspx,Audit.aspx,

   string strPages = txtPages.Text;

   //This is string array where we are going to break down all name of aspx pages 
   //contained in strPages variable

   string[] cdrPages = strValues.Split(',');

   //This is the list where we are going to transfer the names of our aspx pages 
   //for faster searching of existing items

   List<string> accesslist = new List<string>();


   try
        {
            //1. Create Role
            System.Web.Security.Roles.CreateRole(this.txtRoleName.Text);

            //2. Open the Web Configuration --> make sure that you put the correct folder location of your web.config file
            System.Configuration.Configuration config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration(path);

            //3. Get All Specified Locations
            ConfigurationLocationCollection myLocationCollection = config.Locations;

            //4. Transfer the values of string[] strPages to List<string> accessList
            for (int i = 0; i < strPages.Length; i++)
            {
                if (strPages[i].ToString() != null && strPages[i].ToString() != "")
                {
                    accesslist.Add(strPages[i].ToString());
                }
            }

            //5. Loop through the LocationCollections
            foreach (ConfigurationLocation myLocation in myLocationCollection)
            {
                //6. Checks if myLocation exists in List<string> accessList
                bool exists = accesslist.Exists(element => element == myLocation.Path); 

                //If Exists
                if (exists) {

                    //7. Open the configuration of myLocation
                    System.Configuration.Configuration sub = myLocation.OpenConfiguration();

                    //8. Get the authorization section of specific location
                    AuthorizationSection section = (System.Web.Configuration.AuthorizationSection)sub.GetSection("system.web/authorization");

                    //9. Declare the Authorization Rule, in this case, we are allowing a new role to have an access to a specific page
                    AuthorizationRule autho = new System.Web.Configuration.AuthorizationRule(System.Web.Configuration.AuthorizationRuleAction.Allow);

                    //10. Add the New Role to Authorization Section
                    autho.Roles.Add(this.txtRoleName.Text);
                    section.Rules.Add(autho);

                    //11. Save the "sub", or the specific location inside the web.config file.
                    sub.Save();
                }
            }
                message.InnerHtml = "Role Successfully Added!";
                message.Attributes.Add("class", "msg_info");
        }
        catch {
                message.InnerHtml = "Saving Failed";
                message.Attributes.Add("class", "msg_error");
        }

这可能是一个丑陋的代码，但它肯定会工作。 - Jan Russel '生锈的程序员' Calachan

【讨论】：