如何设置和访问app.config文件啊?高手请帮忙.

Question

如何设置和访问app.config文件啊

Answer 1

app.config一般编译后成为如下的文件名格式:
你的项目生成文件名(包含后缀名)+.config
例如:a.exe.config
引入命名空间
using System.Xml;
using System.Configuration;
然后声明ConfigXmlDocument _configDoc，就可以像访问xml文档一样访问了

Answer 2

public class WebConfig:IConfig
{
        private System.Xml.XmlDocument xmlDoc;
private string fileName;
private IDataSecurity iDataSecurity;
/// <summary>
/// 构造函数
/// </summary>
/// <param name="filename">配置文件名字</param>
/// <param name="ids">加密解密类</param>
public WebConfig(string filename,IDataSecurity ids)
{
xmlDoc=new XmlDocument();
fileName=filename;
iDataSecurity=ids;
try
{
xmlDoc.Load(filename);

}
catch
{
xmlDoc=null;
}
}
/// <summary>
/// 获取相应的配置
/// </summary>
/// <param name="configField">配置字段</param>
/// <returns>如果取到该值返回对应值，没有则返回null</returns>
public string GetConfig(string configField)
{
// TODO:  添加 WebConfig.GetConfig 实现
XmlNode xmlNode=xmlDoc.SelectSingleNode("configuration/appSettings/add[@key='" +configField +"']");
if(xmlNode==null)
{
return null;
}
return iDataSecurity.Decrypt(xmlNode.Attributes["value"].Value);
} /// <summary>
/// 设置配置字段
/// </summary>
/// <param name="configField">配置字段</param>
/// <param name="configValue">配置值</param>
public void SetConfig(string configField, string configValue)
{
XmlElement xmlNode=(XmlElement)xmlDoc.SelectSingleNode("configuration/appSettings/add[@key='" +configField +"']");
if(xmlNode==null)
return;
xmlNode.SetAttribute("value",iDataSecurity.Encrypt(configValue));
xmlDoc.Save(fileName);
}
}

Answer 3

ConfigurationSettings.AppSettings("*****")

Answer 4

1.有appSettings节的配置文件及访问方法
//app.config文件
<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <appSettings>
        <add key="connectionstring" value="User ID=sa;Data Source=.;Password=;Initial Catalog=test;Provider=SQLOLEDB.1;" />
        <add key="TemplatePATH" value="Template" />
    </appSettings>
</configuration>//app.config访问string _connectionString=ConfigurationSettings.AppSettings["connectionstring"];
2.自定义配置节//app.config文件<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
        <section name="Test1" type="System.Configuration.SingleTagSectionHandler"/>
        <section name="Test2" type="System.Configuration.DictionarySectionHandler"/>
        <section name="Test3" type="System.Configuration.NameValueSectionHandler" />
    </configSections>
    
    <Test1 setting1="Hello" setting2="World"/>
    <Test2>
        <add key="Hello" value="World" />
    </Test2>
    <Test3>
        <add key="Hello" value="World" />
    </Test3>    
</configuration>//app.config访问
            //访问配置节Test1
            IDictionary IDTest1 = (IDictionary)ConfigurationSettings.GetConfig("Test1");
            string str = (string)IDTest1["setting1"] +" "+(string)IDTest1["setting2"];
            MessageBox.Show(str);        //输出Hello World            //访问配置节Test1的方法2
            string[] values1=new string[IDTest1.Count];
            IDTest1.Values.CopyTo(values1,0);
            MessageBox.Show(values1[0]+" "+values1[1]);    //输出Hello World
            
            //访问配置节Test2
            IDictionary IDTest2 = (IDictionary)ConfigurationSettings.GetConfig("Test2");
            string[] keys=new string[IDTest2.Keys.Count];
            string[] values=new string[IDTest2.Keys.Count];
            IDTest2.Keys.CopyTo(keys,0);
            IDTest2.Values.CopyTo(values,0);
            MessageBox.Show(keys[0]+" "+values[0]);
            
            //访问配置节Test3
            NameValueCollection nc=(NameValueCollection)ConfigurationSettings.GetConfig("Test3");
            MessageBox.Show(nc.AllKeys[0].ToString()+" "+nc["Hello"]);    //输出

Answer 5

public static string ReadXml(string key)
{
string returnValue="";
try
{
returnValue=System.Configuration .ConfigurationSettings .AppSettings[key];
}
catch(Exception e)
{
MessageBox.Show (e.Message .ToString ());
}
return returnValue;
}
public static void WriteXml(string key,string key_value)
{
XmlDocument dc=new XmlDocument ();
dc.Load (filePath);

XmlNode node=dc.SelectSingleNode ("//appSettings");
if(node==null)
{
throw new InvalidOperationException ("Can't find \"appSettings\" Keys in the config file.");
}
try
{
XmlElement elem=(XmlElement)node.SelectSingleNode (string.Format ("//add[@key='{0}']",key));
if(elem!=null)
{
elem.SetAttribute ("value",key_value);
}
else
{
elem=dc.CreateElement ("add");
elem.SetAttribute ("key",key);
elem.SetAttribute ("value",key_value);
node.AppendChild (elem);
}
dc.Save (filePath);
}
catch
{
throw;
}
}