[英]How to read system.web section from web.config
Should be simple, but whatever I try returns null: 应该很简单,但无论我尝试什么都返回null:
const string key = "system.web";
var sectionTry1 = WebConfigurationManager.GetSection(key);
var sectionTry2 = ConfigurationManager.GetSection(key);
I'm sure I have done this before. 我相信我以前做过这件事。
I am using MVC if this makes a difference. 如果这有所作为,我正在使用MVC。
Was being an idiot - system.web is not a config section but a config group. 是一个白痴 - system.web不是配置部分,而是配置组。 If I change the key to an actual section, then both methods work fine.
如果我将密钥更改为实际部分,则两种方法都可以正常工作。 Here's the one using ConfigurationManager:
这是使用ConfigurationManager的那个:
const string outputCacheSettingsKey = "system.web/caching/outputCacheSettings";
var outputCacheSettingsSection = ConfigurationManager.GetSection(outputCacheSettingsKey) as OutputCacheSettingsSection;
I think accessing system.web is slightly different to accessing appSettings. 我认为访问system.web与访问appSettings略有不同。
Try this: 尝试这个:
string configPath = "/MyAppRoot";
Configuration config = WebConfigurationManager.OpenWebConfiguration(configPath);
IdentitySection section = (IdentitySection)config.GetSection("system.web/identity");
You need to cast the relevant section of system.web you're trying to access to a particular type. 您需要强制转换system.web的相关部分,并尝试访问特定类型。
This worked for me: 这对我有用:
public Int32 GetmaxRequestLength()
{
// Set the maximum file size for uploads in bytes.
var section = ConfigurationManager.GetSection("system.web/httpRuntime") as HttpRuntimeSection;
// return length converted to kbytes or return default value as specified
return (Int32) Math.Round((decimal)(section != null ? (double)section.MaxRequestLength * 1024 / 1000 : 5.120), 2);
}
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