当我使用此代码更改连接字符串时,它不会在运行时重新加载app.config
。我希望它重新加载与我们重新加载app.config
的方式类似。
config.ConnectionStrings.ConnectionStrings["JVVNL_NEW.Properties.Settings.JVVNL_NEWConnectionString1"].ConnectionString = ConString;
config.ConnectionStrings.ConnectionStrings["CMS_NEW.Properties.Settings.JVVNL_NEWConnectionString1"].ConnectionString = ConString;
config.Save(ConfigurationSaveMode.Modified,true);
ConfigurationManager.RefreshSection(config.ConnectionStrings.SectionInformation.SectionName);
答案 0 :(得分:80)
必须做到这一点。这是对我有用的代码:
var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var connectionStringsSection = (ConnectionStringsSection)config.GetSection("connectionStrings");
connectionStringsSection.ConnectionStrings["Blah"].ConnectionString = "Data Source=blah;Initial Catalog=blah;UID=blah;password=blah";
config.Save();
ConfigurationManager.RefreshSection("connectionStrings");
答案 1 :(得分:6)
IIRC,ConfigurationManager.RefreshSection需要一个字符串参数,指定要刷新的部分的名称:
ConfigurationManager.RefreshSection("connectionStrings");
我认为在修改ConnectionStrings元素时,ASP.NET应用程序应该自动重新加载,并且不需要手动重新加载配置。
答案 2 :(得分:4)
//You can apply the logic in "Program.cs"
//Logic for getting new connection string
//****
//
MyDBName="mydb";
//
//****
//Assign new connection string to a variable
string newCnnStr = a="Data Source=.\SQLExpress;Initial Catalog=" + MyDBName + ";Persist Security Info=True;User ID=sa;Password=mypwd";
//And Finally replace the value of setting
Properties.Settings.Default["Nameof_ConnectionString_inSettingFile"] = newCnnStr;
//This method replaces the value at run time and also don't needs app.config for the same setting. It will have the va;ue till the application runs.
//It worked for me.
答案 3 :(得分:2)
您还可以完整地刷新配置:
ConnectionStringSettings importToConnectionString = currentConfiguration.ConnectionStrings.ConnectionStrings[newName];
if (importToConnectionString == null)
{
importToConnectionString = new ConnectionStringSettings();
importToConnectionString.ConnectionString = importFromConnectionString.ConnectionString;
importToConnectionString.ProviderName = importFromConnectionString.ProviderName;
importToConnectionString.Name = newName;
currentConfiguration.ConnectionStrings.ConnectionStrings.Add(importToConnectionString);
}
else
{
importToConnectionString.ConnectionString = importFromConnectionString.ConnectionString;
importToConnectionString.ProviderName = importFromConnectionString.ProviderName;
}
Properties.Settings.Default.Reload();
答案 4 :(得分:1)
是的,当ASP.NET web.config得到更新时,整个应用程序都会重新启动,这意味着web.config会重新加载。
答案 5 :(得分:1)
首先,您可能想要添加
using System.Configuration;
到你的.cs文件。如果不可用,请通过项目参考添加它,因为默认情况下它不包含在新项目中。
这是我解决这个问题的方法。 首先,我创建了ConnectionProperties类,它保存了我需要在原始连接字符串中更改的项目。 ConnectionProperties类中的_name变量对于connectionString的名称很重要 第一种方法采用连接字符串并使用新值更改所需的选项。
private String changeConnStringItem(string connString,string option, string value)
{
String[] conItems = connString.Split(';');
String result = "";
foreach (String item in conItems)
{
if (item.StartsWith(option))
{
result += option + "=" + value + ";";
}
else
{
result += item + ";";
}
}
return result;
}
您可以更改此方法以满足您自己的需求。我有mysql和mssql连接,所以我需要它们。当然,您可以自己完善此草案代码。
private void changeConnectionSettings(ConnectionProperties cp)
{
var cnSection = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
String connString = cnSection.ConnectionStrings.ConnectionStrings[cp.Name].ConnectionString;
connString = changeConnStringItem(connString, "provider connection string=\"data source", cp.DataSource);
connString = changeConnStringItem(connString, "provider connection string=\"server", cp.DataSource);
connString = changeConnStringItem(connString, "user id", cp.Username);
connString = changeConnStringItem(connString, "password", cp.Password);
connString = changeConnStringItem(connString, "initial catalog", cp.InitCatalogue);
connString = changeConnStringItem(connString, "database", cp.InitCatalogue);
cnSection.ConnectionStrings.ConnectionStrings[cp.Name].ConnectionString = connString;
cnSection.Save();
ConfigurationManager.RefreshSection("connectionStrings");
}
由于我不想添加琐碎的信息,我省略了代码的属性区域。如果您希望这样做,请添加它。
class ConnectionProperties
{
private String _name;
private String _dataSource;
private String _username;
private String _password;
private String _initCatalogue;
/// <summary>
/// Basic Connection Properties constructor
/// </summary>
public ConnectionProperties()
{
}
/// <summary>
/// Constructor with the needed settings
/// </summary>
/// <param name="name">The name identifier of the connection</param>
/// <param name="dataSource">The url where we connect</param>
/// <param name="username">Username for connection</param>
/// <param name="password">Password for connection</param>
/// <param name="initCat">Initial catalogue</param>
public ConnectionProperties(String name,String dataSource, String username, String password, String initCat)
{
_name = name;
_dataSource = dataSource;
_username = username;
_password = password;
_initCatalogue = initCat;
}
// Enter corresponding Properties here for access to private variables
}
答案 6 :(得分:0)
//这里是如何在Windows App.Config中执行此操作
public static bool ChangeConnectionString(string Name, string value, string providerName, string AppName)
{
bool retVal = false;
try
{
string FILE_NAME = string.Concat(Application.StartupPath, "\\", AppName.Trim(), ".exe.Config"); //the application configuration file name
XmlTextReader reader = new XmlTextReader(FILE_NAME);
XmlDocument doc = new XmlDocument();
doc.Load(reader);
reader.Close();
string nodeRoute = string.Concat("connectionStrings/add");
XmlNode cnnStr = null;
XmlElement root = doc.DocumentElement;
XmlNodeList Settings = root.SelectNodes(nodeRoute);
for (int i = 0; i < Settings.Count; i++)
{
cnnStr = Settings[i];
if (cnnStr.Attributes["name"].Value.Equals(Name))
break;
cnnStr = null;
}
cnnStr.Attributes["connectionString"].Value = value;
cnnStr.Attributes["providerName"].Value = providerName;
doc.Save(FILE_NAME);
retVal = true;
}
catch (Exception ex)
{
retVal = false;
//Handle the Exception as you like
}
return retVal;
}
答案 7 :(得分:0)
这是我使用的方法:
public void AddOrUpdateAppConnectionStrings(string key, string value)
{
try
{
var configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var settings = configFile.ConnectionStrings.ConnectionStrings;
if (settings[key] == null)
{
settings.Add(new ConnectionStringSettings(key,value));
}
else
{
settings[key].ConnectionString = value;
}
configFile.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection(configFile.ConnectionStrings.SectionInformation.Name);
Properties.Settings.Default.Reload();
}
catch (ConfigurationErrorsException)
{
Console.WriteLine("Error writing app settings");
}
}