.net System.UriFormatException：无效的 URI：无法解析主机名
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System.UriFormatException: Invalid URI: The hostname could not be parsed
提问by Shane
All of a sudden I'm getting the following error on my website. It doesn't access a database. It's just a simple website using .NET 2.0.
突然间，我的网站出现以下错误。它不访问数据库。它只是一个使用 .NET 2.0 的简单网站。
I did recently apply the available windows server 2003 service packs. Could that have changed things?
我最近确实应用了可用的 Windows Server 2003 服务包。这会改变事情吗？
I should add that the error randomly comes and goes and has been doing so for today and yesterday. I leave it for 5 minutes and the error is gone.
我应该补充一点，错误随机来来去去，今天和昨天一直如此。我离开它 5 分钟，错误消失了。
Server Error in '/' Application.
Invalid URI: The hostname could not be parsed. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
“/”应用程序中的服务器错误。
无效的 URI：无法解析主机名。说明：在执行当前 Web 请求期间发生未处理的异常。请查看堆栈跟踪以获取有关错误及其在代码中的来源的更多信息。
Exception Details:
异常详情：
System.UriFormatException: Invalid URI: The hostname could not be parsed.
System.UriFormatException：无效的 URI：无法解析主机名。
Source Error:
源错误：
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
执行当前 Web 请求期间生成了未处理的异常。可以使用下面的异常堆栈跟踪来识别有关异常来源和位置的信息。
Stack Trace:
堆栈跟踪：
[UriFormatException: Invalid URI: The hostname could not be parsed.]
System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind) +5367536 System.Uri.CreateUri(Uri baseUri, String relativeUri, Boolean dontEscape) +31 System.Uri..ctor(Uri baseUri, String relativeUri) +34 System.Net.HttpWebRequest.CheckResubmit(Exception& e) +5300867[WebException: Cannot handle redirect from HTTP/HTTPS protocols to other dissimilar ones.] System.Net.HttpWebRequest.GetResponse() +5314029 System.Xml.XmlDownloadManager.GetNonFileStream(Uri uri, ICredentials credentials) +69
System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials credentials) +3929371 System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn) +54
System.Xml.XmlTextReaderImpl.OpenUrlDelegate(Object xmlResolver) +74
System.Threading.CompressedStack.runTryCode(Object userData) +70
System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) +0
System.Threading.CompressedStack.Run(CompressedStack compressedStack, ContextCallback callback, Object state) +108
System.Xml.XmlTextReaderImpl.OpenUrl() +186
System.Xml.XmlTextReaderImpl.Read() +208
System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace) +112 System.Xml.XmlDocument.Load(XmlReader reader) +108
System.Web.UI.WebControls.XmlDataSource.PopulateXmlDocument(XmlDocument document, CacheDependency& dataCacheDependency, CacheDependency& transformCacheDependency) +303
System.Web.UI.WebControls.XmlDataSource.GetXmlDocument() +153
System.Web.UI.WebControls.XmlDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +29 System.Web.UI.WebControls.BaseDataList.GetData() +39 System.Web.UI.WebControls.DataList.CreateControlHierarchy(Boolean useDataSource) +264
System.Web.UI.WebControls.BaseDataList.OnDataBinding(EventArgs e) +55 System.Web.UI.WebControls.BaseDataList.DataBind() +75
System.Web.UI.WebControls.BaseDataList.EnsureDataBound() +55
System.Web.UI.WebControls.BaseDataList.CreateChildControls() +65
System.Web.UI.Control.EnsureChildControls() +97
System.Web.UI.Control.PreRenderRecursiveInternal() +53
System.Web.UI.Control.PreRenderRecursiveInternal() +202
System.Web.UI.Control.PreRenderRecursiveInternal() +202
System.Web.UI.Control.PreRenderRecursiveInternal() +202
System.Web.UI.Control.PreRenderRecursiveInternal() +202
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4588
[UriFormatException: Invalid URI: The hostname could not be parsed.]
System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind) +5367536 System.Uri.CreateUri(Uri baseUri, String relativeUri, Boolean dontEscape) +31 System. Uri..ctor(Uri baseUri, String relativeUri) +34 System.Net.HttpWebRequest.CheckResubmit(Exception& e) +5300867[WebException：无法处理从 HTTP/HTTPS 协议到其他不同协议的重定向。] System.Net.HttpWebRequest.GetResponse() +5314029 System.Xml.XmlDownloadManager.GetNonFileStream(Uri uri, ICredentials 凭据) +69
System.Xml.XmlDownloadManager。 GetStream(Uri uri, ICredentials 凭证) +3929371 System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn) +54
System.Xml.XmlTextReaderImpl.OpenUrlDelegate(Object xmlResolver) +74
System.Threading.CompressedStack.对象 userData) +70
System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) +0
System.Threading.CompressedStack.Run(CompressedStack compressionStack, ContextCallback callback, Object state) +108
System.Xml.XmlTextReaderImpl.OpenUrl() +186
System.Xml.XmlTextReaderImpl.Read() +208
System.Xml.XmlLoader.Load(XmlDocument) doc、XmlReader 阅读器、布尔值preserveWhitespace) +112 System.Xml.XmlDocument.Load(XmlReader reader) +108
System.Web.UI.WebControls.XmlDataSource.PopulateXmlDocument(XmlDocument 文档、CacheDependency&dataCacheDependency、CacheDependency&transformCacheDependency
System.Web.303 UI.WebControls.XmlDataSource.GetXmlDocument() +153
System.Web.UI.WebControls.XmlDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +29 System.Web.UI.WebControls.BaseDataList.GetData() +39 System.Web.UI.WebControls.DataList.CreateControlHierarchy(Boolean useDataSource) +264
System .Web.UI.WebControls.BaseDataList.OnDataBinding(EventArgs e) +55 System.Web.UI.WebControls.BaseDataList.DataBind() +75
System.Web.UI.WebControls.BaseDataList.EnsureDataBound() +55
System.Web。 UI.WebControls.BaseDataList.CreateChildControls() +65
System.Web.UI.Control.EnsureChildControls() +97
System.Web.UI.Control.PreRenderRecursiveInternal() +53
System.Web.UI.Control.PreRenderRecursiveInternal() +202
System.Web.UI.Control.PreRenderRecursiveInternal() +202
System.Web.UI.Control.PreRenderRecursiveInternal() +202
System.Web.UI.Control.PreRenderRecursiveInternal() +202
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4588
回答by Jim Mischel
There are some bugs in Uri.Create and Uri.TryCreate that allow them to create invalid URIs that cannot subsequently be parsed. I've run into this from time to time, but have been unable to track down the url strings that cause it. I posted a little bit about it here.
Uri.Create 和 Uri.TryCreate 中存在一些错误，允许它们创建随后无法解析的无效 URI。我不时遇到这个问题，但一直无法追踪导致它的 url 字符串。我在这里发布了一些关于它的信息。
If you have a list of urls and know that one of them causes the problem (I didn't have that luxury, as I encountered this in a Web crawl where I wasn't saving the page text), you can find the error with something like this pseudocode:
如果您有一个 url 列表并且知道其中一个导致了问题（我没有那么奢侈，因为我在没有保存页面文本的 Web 爬行中遇到了这个问题），您可以找到错误像这样的伪代码：
while not end of file
{
string url = read from file
Uri uri = new Uri(url);
try
{
string host = uri.Host;
}
catch (UriFormatException)
{
Console.WriteLine("Bad url: {0}", url);
}
}
If you can identify some urls that cause this exception, I'd sure like to see them.
如果您能找出一些导致此异常的 url，我肯定希望看到它们。
