Getting parameter values in the app.config configuration file _ Practical Tips

The following code samples to show you, the specific content is as follows:

First add System.Configuration Reference
To add parameters to the app.config configuration file
app.config Add
to add parameters to the app.config configuration file
Example:

In this app.config configuration file, I have added 4 parameters, app.config parameters like Hashtable are key/value pairs

<?xml version= "1.0" encoding= "Utf-8"?>
<configuration>
 <appSettings>
 <add key= " Thedate "value=" 2015-07-20 16:25 "/> <add" key= "thename" Alice "value=/> <add" key= "Thetype
 "NBA"/>
 <add key= "Theprice" value= "12500.00"/>
 </appSettings>
</configuration >

　　How do you access the parameter values in the app.config configuration file?

Using System;
Using System.Collections.Generic;
Using System.Linq;
Using System.Text;
Using System.Configuration;

Namespace Appconfigdemo
{
 class program
 {
  static void Main (string[] args)
  {
   // Determine if the app.config configuration file has a key (non-null)
   if (ConfigurationManager.AppSettings.HasKeys ())
   {
    // Loops through all the key-
    foreach (string s in configurationmanager.appsettings)
    {
     Console.WriteLine (s) of the configuration file;
    }
   }
   Console.readkey ();}}

　　The code to traverse the key using a For loop is as follows:

 static void Main (string[] args)
  {
   //determine if a key (not NULL) is in the App.config configuration file (
   ConfigurationManager.AppSettings.HasKeys ())
   {
    //loops through all key keys for
    (int i = 0; i < in the configuration file) ConfigurationManager.AppSettings.Count; i++)
    {
     Console.WriteLine (ConfigurationManager.AppSettings.GetKey (i));
    }
   Console.readkey ();
  }

　　How to access value via key:

static void Main (string[] args)
  {
   //determine if a key (not NULL) is in the App.config configuration file (
   ConfigurationManager.AppSettings.HasKeys ())
   {
    //Get the value foreach of the "Thedate" key
    (string s in ConfigurationManager.AppSettings.GetValues ("Thedate"))
    {
     Console.WriteLine (s);
    }
   }
   Console.readkey ();
  }

　　What if you want to get the value collection of all keys?

Idea: All keys are traversed and stored in a container (for example, an array), and then a key match is used to find the value.

 static void Main (string[] args) {//Determine if a key (not null) if (Config) is in the app.config configuration file UrationManager.AppSettings.HasKeys ()) {list<string> Thekeys = new list<string> ();//Save Key collection list& lt;string> thevalues = new list<string> ();
     Save the collection of value//traverse out all key and add it to Thekeys set foreach (String Thekey in ConfigurationManager.AppSettings.Keys) {
    Thekeys.add (Thekey);  "//////Thevalues All value according to key and add it to the set for (int i = 0; i < Thekeys.count; i++) {foreach (String thevalue
     In ConfigurationManager.AppSettings.GetValues (Thekeys[i])) {Thevalues.add (thevalue);
    }//Verify Console.WriteLine ("*************key*************");
    foreach (string s in Thekeys) {Console.WriteLine (s);
    } Console.WriteLine ("************value************");
    foreach (var item in thevalues) {Console.WriteLine (item);
  } console.readkey (); }

The code above is an example of using the. NET technology to get the parameter values in the app.config configuration file, as a friend can refer to.