How to read system.web section from web.config

Question

Should be simple, but whatever I try returns null:

const string key = "system.web";

var sectionTry1 = WebConfigurationManager.GetSection(key);

var sectionTry2 = ConfigurationManager.GetSection(key);

I'm sure I have done this before.

I am using MVC if this makes a difference.

score 29 · Accepted Answer · answered Jun 11 '10 at 11:35

29

Was being an idiot - system.web is not a config section but a config group. If I change the key to an actual section, then both methods work fine. Here's the one using ConfigurationManager:

const string outputCacheSettingsKey = "system.web/caching/outputCacheSettings";           

var outputCacheSettingsSection = ConfigurationManager.GetSection(outputCacheSettingsKey) as OutputCacheSettingsSection;

answered Jun 11 '10 at 11:35

Paul Hiles

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For the record the same works if you need to get the compilation section, except that you cast it to `CompilationSection` – The Muffin Man Oct 03 '13 at 16:02

score 7 · Answer 2 · edited Feb 16 '18 at 14:48

7

I think accessing system.web is slightly different to accessing appSettings.

Try this:

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.

edited Feb 16 '18 at 14:48

Hakan Fıstık

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answered Jun 11 '10 at 10:14

RPM1984

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First, check if `system.web/identity` ***section exists*** ? – Kiquenet Oct 18 '17 at 12:44

score 6 · Answer 3 · edited Aug 28 '12 at 18:37

6

This worked for me:

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);
}

edited Aug 28 '12 at 18:37

Mihai Iorga

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answered Aug 28 '12 at 16:44

Raine

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`ConfigurationManager.GetSection` reads ***machine.config*** or ***web.config*** ? Only I want read ***web.config*** – Kiquenet Oct 18 '17 at 13:05

How to read system.web section from web.config

3 Answers3

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