Obtain the parameter values in the App. config configuration file.

Obtain the parameter values in the App. config configuration file.

The following code is used as an example. The specific content is as follows:

First add System. Configuration reference
Add parameters to the App. config configuration file
Add App. config
Add parameters to the App. config configuration file
Example:

In this App. config configuration file, I added four parameters. The 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" value="Alice"/> <add key="theType" value="NBA"/> <add key="thePrice" value="12500.00"/> </appSettings></configuration>

　　How can I 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) {// judge the App. whether the config file contains Key (non-null) if (ConfigurationManager. appSettings. hasKeys () {// cyclically traverse all the Key keys in the configuration file foreach (string s in ConfigurationManager. appSettings) {Console. writeLine (s) ;}} Console. readKey ();}}}

　　The code for traversing the Key using the for loop is as follows:

Static void Main (string [] args) {// judge the App. whether the config file contains Key (non-null) if (ConfigurationManager. appSettings. hasKeys () {// cyclically traverse all the Key keys in the configuration file for (int I = 0; I <ConfigurationManager. appSettings. count; I ++) {Console. writeLine (ConfigurationManager. appSettings. getKey (I) ;}} Console. readKey ();}

　　Access Value through Key:

Static void Main (string [] args) {// judge the App. whether the config file contains Key (non-null) if (ConfigurationManager. appSettings. hasKeys () {// obtain the Value foreach (string s in ConfigurationManager) of the "theDate" key. appSettings. getValues ("theDate") {Console. writeLine (s) ;}} Console. readKey ();}

　　What if you want to obtain the Value set of all keys?

Idea: traverse all the keys and save them in a container (for example, an array). Then, use the Key to match and find the Value.

Static void Main (string [] args) {// judge the App. whether the config file contains Key (non-null) if (ConfigurationManager. appSettings. hasKeys () {List <string> theKeys = new List <string> (); // List of keys saved <string> theValues = new List <string> (); // Save the Value set // traverse all keys and add them to theKeys set foreach (string theKey in ConfigurationManager. appSettings. keys) {theKeys. add (theKey) ;}// traverse all values based on the Key and Add them to the theValues set for (int I = 0; I <theKeys. count; I ++) {foreach (string theValue in ConfigurationManager. appSettings. getValues (theKeys [I]) {theValues. add (theValue) ;}/// verify the 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 above Code uses the. net technology to obtain the parameter values in the app. config configuration file. For more information, see.