[英]WebRequest.Create throws System.NullReferenceException
我正在尝试创建WebRequest
的实例,但它引发了异常。
码:
WebRequest request = WebRequest.Create("somURL");
错误:
System.NullReferenceException: Object reference not set to an instance of an object.
此代码在本地环境上运行,但在客户端生产服务器上失败。
注意:客户端最近更改了托管。 .Net Framework是3.5。
完全例外:
System.Security.SecurityException: Request for the permission of type 'System.Net.WebPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. at System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet) at System.Security.CodeAccessPermission.Demand() 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(String requestUriString) at
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