ConfigurationManager Usage_string value = configurationmanager.appsettings["k-优快云博客

Writing this blog is to practice my poor English!

1 ConfigurationManager Class

When we’d like to use ConfigurationManager,we should reference the configuration DLL. The detail step is the following content:

Project->Add Reference…->Browse, then you can choose the target DLL in folders such as

C:\Program Files\ReferenceAssemblies\Microsoft\Framework\.NETFramework\v4.0

C:\Program Files\ReferenceAssemblies\Microsoft\Framework\.NETFramework\v4.5

Either will be suitable.

1.1 Read Data From Configure File

String value = ConfigurationManager.AppSettings["Key"];

1.2 Write Data to Configure File

1) Write Data to source file

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

config.AppSettings.Settings.Add("new_Key","Value");

config.AppSettings.Settings["source_Key"].Value= "value";

config.Save();

2) Write Data to another file

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

string configFile = “…\\app.config”;

config.SaveAs(configFile,ConfigurationSaveMode.Full);

config.AppSettings.Settings.Add("Key","Value");

config.AppSettings.Settings["Key"].Value= "Value";

config.Save();

1.3 Access only appSetting configuration file

The following file is a common application configure example with appSettings:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
     <appSettings>
         <add key="name "value="jackey" />
         <add key="path "value="c://app.config" />
     </appSettings>
</configuration>

1) Read method:

String name = ConfigurationManager.AppSettings["name"];

AppSettings property is read-only, we can’t have update or insert operations on those appSetting Sections.

2) Write method:

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

config.AppSettings.Settings["name"].Value= "value";

config.Save();

1.4 Custom Configuration File

The configSections element specifies configuration section and handler declarations. The configuration section isincluded in <configSections></configSections>, then use the definedsection type to declare the section. If the configSections element is in a configuration file, the configSectionselement must be the first child element of the configuration element.

The following content presents how to use the configSections:

<?xml version="1.0"encoding="utf-8" ?>

</configSections>

<supportedRuntimeversion="v4.0"sku=".NETFramework,Version=v4.0" /></startup>

</appSettings>

<type2>

</type2>

<type3>

</type3>

</configuration>

The example shows that the configSections type mainly includes:

System.Configuration.SingleTagSectionHandler
System.Configuration.DictionarySectionHandler
System.Configuration.NameValueSectionHandler

Now we will discuss how to use this custom sections:

1) Read type1 Section

IDictionary IDTest1 = (IDictionary)ConfigurationManager.GetSection("type1");

String str = (String)IDTest1["setting1"]+ " " + (String)IDTest1["setting2"];

Console.WriteLine(str);

We can use another way:

IDictionary IDTest1_1 = (IDictionary)ConfigurationManager.GetSection("type1");

string[] values1 = new string[IDTest1_1.Count];

IDTest1_1.Values.CopyTo(values1,0);

Console.WriteLine(values1[0]+ " " + values1[1]);

2) Read type2 Section

IDictionary IDTest2 = (IDictionary)ConfigurationManager.GetSection("type2");

string[] keys = new string[IDTest2.Keys.Count];

string[] values = new string[IDTest2.Keys.Count];

IDTest2.Keys.CopyTo(keys, 0);

IDTest2.Values.CopyTo(values, 0);

Console.WriteLine(keys[0] + "" + values[0]);

3) Read type3 Section

NameValueCollection nc = (NameValueCollection)ConfigurationManager.GetSection("type3");

Console.WriteLine(nc.AllKeys[0].ToString()+ " " + nc["hello3"]);

1.5 Custom Section Group

We can use <sectionGroup> element to classify the similar Sections to a same group. The sectionGroup Declaration creates the sectiontypes which is used to declare a section. For examples:

<?xmlversion="1.0"encoding="utf-8" ?>