如何獲取網頁配置位置元素？

Question

如何獲取Web配置位置元素？

ConfigurationManager.GetSection("appSettings") returns Okay 

ConfigurationManager.GetSection("location") return null 

I.E. ...

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

Answer 1

你得到一個錯誤，造成這種情況的原因是因爲在.NET中，自定義應用程序配置部分（在您的示例中的「位置」部分如）要求您提供自定義配置節處理程序。

你需要使用的主界面是IConfigurationSectionHandler

這裏是如何創建一個custom configuration handler MSDN文章。

Answer 2

這有幫助嗎？

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(); 

here從

Answer 3

兩者，這是因爲appSettings是已知的（默認）配置在.NET應用程序部分。如果你想使用你自己的配置部分，你必須create it。

Answer 4

不知道這是否是你想要什麼，但你可以像這樣在web.config location元素中得到部分...

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

Answer 5

我想提高Neil的回答： 許多人說，不建議在運行時修改web.config。但是這裏的代碼是如何做到的。

//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"); 
     } 

這可能是一個醜陋的代碼，但肯定會起作用。 - 揚羅素「生鏽的程序員Calachan