但是这个变量不会一个固定的值，会根据实际情况而发生变化，比如在需要读取一个配置文件的路径，而这个路径是站点发布的实际硬盘路径，如果直接是编译时状态，没有问题。但是如果站点iis更换路径，就需要修改这个web.config中的参数。如果能将这个编译时状态修改为运行时状态，那将更为合理和方便。这就需要存在一种在代码中能够动态修改web.config的方案。
代码
复制代码 代码如下:
/// <summary>
/// 写入web.config
/// </summary>
/// <param name="item">appSettings等</param>
/// <param name="key">键</param>
/// <param name="value">值</param>
public void WriteConfig(string item, string key, string value)
{
if (item == "")
{
item = "appSettings";
}
Configuration config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration(System.Web.HttpContext.Current.Request.ApplicationPath);
AppSettingsSection appSection = (AppSettingsSection)config.GetSection(item);
if (appSection.Settings[key] == null)
{
appSection.Settings.Add(key, value);
config.Save();
}
else
{
appSection.Settings.Remove(key);
appSection.Settings.Add(key, value);
config.Save();
}
}
/// 写入web.config
/// </summary>
/// <param name="item">appSettings等</param>
/// <param name="key">键</param>
/// <param name="value">值</param>
public void WriteConfig(string item, string key, string value)
{
if (item == "")
{
item = "appSettings";
}
Configuration config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration(System.Web.HttpContext.Current.Request.ApplicationPath);
AppSettingsSection appSection = (AppSettingsSection)config.GetSection(item);
if (appSection.Settings[key] == null)
{
appSection.Settings.Add(key, value);
config.Save();
}
else
{
appSection.Settings.Remove(key);
appSection.Settings.Add(key, value);
config.Save();
}
}