[英]Exception when specifying defaultProxy in app.config when running NET4.0 application from network share
從NET4.0下的網絡共享運行以下應用程序時,我們看到一個非常奇怪的問題。 在app.config中指定defaultProxy部分時,會拋出System.Net.WebException 。 從本地驅動器運行時沒有問題。
根據文檔,應用程序將作為來自網絡共享的完全信任程序集運行,因此我們假設這應該可以正常工作。
有什么想法我們如何解決這個問題?
有沒有其他人遇到過這個問題,或者有人知道為什么會這樣嗎?
using System;
using System.Net;
namespace ProxyTest
{
class Program
{
static void Main(string[] args)
{
try
{
String s = new WebClient().DownloadString("http://www.google.com");
}
catch (Exception e)
{
Console.WriteLine(e);
}
}
}
}
<?xml version="1.0"?>
<configuration>
<system.net>
<defaultProxy useDefaultCredentials="true"/>
</system.net>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0,Profile=Client"/>
</startup>
</configuration>
System.Net.WebException: An exception occurred during a WebClient request. ---> System.Configuration.ConfigurationErrorsException: Insufficient permissions for setting the configuration section 'defaultProxy'. ---> System.Security.SecurityException: Request for the permission of type 'System.Net.WebPermission, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
at System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet)
at System.Security.CodeAccessSecurityEngine.Check(CodeAccessPermission cap, StackCrawlMark& stackMark)
at System.Security.CodeAccessPermission.Demand()
at System.Net.Configuration.DefaultProxySection.PostDeserialize()
--- End of inner exception stack trace ---
at System.Configuration.BaseConfigurationRecord.EvaluateOne(String[] keys, SectionInput input, Boolean isTrusted, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult)
at System.Configuration.BaseConfigurationRecord.Evaluate(FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult, Boolean getLkg, Boolean getRuntimeObject, Object& result, Object& resultRuntimeObject)
at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject)
at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject)
at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject)
at System.Configuration.BaseConfigurationRecord.GetSection(String configKey, Boolean getLkg, Boolean checkPermission)
at System.Configuration.BaseConfigurationRecord.GetSection(String configKey)
at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection(String sectionName)
at System.Configuration.ConfigurationManager.GetSection(String sectionName)
at System.Configuration.PrivilegedConfigurationManager.GetSection(String sectionName)
at System.Net.Configuration.DefaultProxySectionInternal.GetSection()
at System.Net.WebRequest.get_InternalDefaultWebProxy()
at System.Net.HttpWebRequest..ctor(Uri uri, ServicePoint servicePoint)
at System.Net.HttpRequestCreator.Create(Uri Uri)
at System.Net.WebRequest.Create(Uri requestUri, Boolean useUriBase)
at System.Net.WebRequest.Create(Uri requestUri)
at System.Net.WebClient.GetWebRequest(Uri address)
at System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request)
--- End of inner exception stack trace ---
at System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request)
at System.Net.WebClient.DownloadString(Uri address)
at System.Net.WebClient.DownloadString(String address)
at ProxyTest.Program.Main(String[] args) in Y:\Program.cs:line 12
請參閱此 Microsoft知識庫文章:
症狀:
- 您運行存儲在網絡共享上的基於Microsoft .NET Framework 4的應用程序。
- 應用程序在System.Configuration.ConfigurationManager類中調用靜態方法。 例如,應用程序調用ConfigurationManager.GetSection方法。
在這種情況下,拋出System.Security.SecurityException異常,然后應用程序崩潰。
原因:
出現此問題的原因是該方法無法從網絡共享上的應用程序訪問配置節。
您可以從該站點請求此修補程序。
我們已經看到類似的症狀 - 相同的錯誤信息
設置配置部分'defaultProxy'的權限不足
在運行控制台應用程序時,文件被“阻止”。
通過從超鏈接下載zip文件來安裝文件,並且在解壓縮之前zip文件沒有被“解鎖”。
從資源管理器中取消阻止所有文件(您必須在Windows中單獨執行)>右鍵單擊>屬性>取消阻止解決了問題。
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