我们在开发web系统的时候,使用web.config进行配置是司空见惯的,那么web.confg到底是什么呢?什么时候使用web.config呢?有几种使用web.config方式呢? 如果不太明白的话,那这篇文章就带领大家脑补下。
》》首先回答第一个问题,web.config是什么?
是一个XML文本文件。用来存储ASP.NETWEB的配置信息。修改不需要重启服务器就可以生效。
》》 然后第二个问题,什么时候使用web.config?
网站中很多不确定的可能随时更改的数据都可以写到配置文件里面。
》》有几种使用web.config的方式呢?
下面就介绍几种常见的:
~ connectionStrings配置(这个一般用来配置数据库连接)
<connectionStrings> <add name="Default" connectionString="Server=.; Database=Inferno;User ID=sa; Password=pwd123;MultipleActiveResultSets=true" providerName="System.Data.SqlClient" /> </connectionStrings>
获取:
string dbStr=ConfigurationManager.ConnectionStrings["Default"].ConnectionString;
~appSettings配置(这个一般用来配置不确定的或者需要用户配置的内容)
<appSettings> <add key="webpages:Version" value="3.0.0.0" /> <add key="webpages:Enabled" value="false" /> <add key="ClientValidationEnabled" value="true" /> <add key="UnobtrusiveJavaScriptEnabled" value="true" /> </appSettings>
获取
string clientValidationEnabled= ConfigurationManager.AppSettings["ClientValidationEnabled"].ToString();
~自定义配置(这个一般用户批量配置某些内容)
例如,我下面定义了一个jieDian 键值对配置和一个 fileupload 上传文件集合配置
其中,上面的UploadConditionHandler我对应的是一个类:(这个类需要继承IConfigurationSectionHandler并实现Create方法)
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
namespace TestProject { public class UploadConditionHandler : IConfigurationSectionHandler { public UploadConditionHandler() { } public static NameValueCollection ossrules = ConfigurationManager.GetSection("testSectionGroup/jieDian") as NameValueCollection; public static Dictionary<string, UploadRequiredParameters> ScreensDictionary = ConfigurationManager.GetSection("testSectionGroup/fileupload") as Dictionary<string, UploadRequiredParameters>; public object Create(object parent, object configContext, XmlNode section) { Dictionary<string, UploadRequiredParameters> screens = new Dictionary<string, UploadRequiredParameters>(); try { string name = string.Empty; string path_rule = string.Empty; string disk = string.Empty; string receive_server = string.Empty; string ext_array = string.Empty; string max_memory_size = string.Empty; string enum_bucket_name = string.Empty; string max_pixel_height = string.Empty; string max_pixel_width = string.Empty; foreach (XmlNode childNode in section.ChildNodes) { if (childNode.NodeType != XmlNodeType.Element || childNode.Name != "upload") continue; if (childNode.Attributes["name"] != null) { name = childNode.Attributes["name"].Value; if (childNode.Attributes["path_rule"] != null) { path_rule = childNode.Attributes["path_rule"].Value; } if (childNode.Attributes["disk"] != null) { disk = childNode.Attributes["disk"].Value; } if (childNode.Attributes["receive_server"] != null) { receive_server = childNode.Attributes["receive_server"].Value; } if (childNode.Attributes["ext_array"] != null) { ext_array = childNode.Attributes["ext_array"].Value; } if (childNode.Attributes["max_memory_size"] != null) { max_memory_size = childNode.Attributes["max_memory_size"].Value; } if (childNode.Attributes["enum_bucket_name"] != null) { enum_bucket_name = childNode.Attributes["enum_bucket_name"].Value; } if (childNode.Attributes["max_height"] != null) { max_pixel_height = childNode.Attributes["max_height"].Value; } if (childNode.Attributes["max_width"] != null) { max_pixel_width = childNode.Attributes["max_width"].Value; } UploadRequiredParameters upload = new UploadRequiredParameters(); upload.PathRule = path_rule; upload.Disk = disk; upload.ReceiveServer = receive_server; upload.ExtArray = ext_array; int maxMemorySize = 0; if (int.TryParse(max_memory_size, out maxMemorySize)) { upload.MaxMemorySize = maxMemorySize; } upload.EnumBucketName = enum_bucket_name; int maxPixelHeight = 0; if (int.TryParse(max_pixel_height, out maxPixelHeight)) { upload.MaxPixelHeight = maxPixelHeight; } int maxPixelWidth = 0; if (int.TryParse(max_pixel_width, out maxPixelWidth)) { upload.MaxPixelWidth = maxPixelWidth; } screens.Add(name, upload); } } } catch (Exception ex) { throw ex; } return screens; } } }
好了,上面的步骤完成后,就可以在其它地方调用了:
string jieDian1=UploadConditionHandler.ossrules["JieDian1"]; UploadRequiredParameters res = UploadConditionHandler.ScreensDictionary["UploadRules_Mostly"];
目前就先介绍这么多啦,有什么疑问的或者需要了解的欢迎留言~