我想使用我的C#代码从Microsoft报表服务器下载PDF报表。我不知道为什么,但是我做错了。我总是收到一条错误消息,提示身份验证失败(HTTP 401)。
public static async Task<Stream> DownloadWebDocument(string url) {
if (string.IsNullOrEmpty(url))
throw new ArgumentNullException(nameof(url));
WebRequest request = WebRequest.Create(url);
request.Method = "GET";
request.AuthenticationLevel = System.Net.Security.AuthenticationLevel.MutualAuthRequested;
request.Credentials = new NetworkCredential("MyUsername", "MyPassword", "MyDomain");
//request.Headers.Add("Authorization", $"Basic {Convert.ToBase64String(System.Text.Encoding.Default.GetBytes("MyUsername:MyPassword"))}");
try {
using WebResponse response = await request.GetResponseAsync();
return response.GetResponseStream();
} catch (Exception ex) {
var a = ex.Message;
throw;
}
//return await DownloadWebDocument(uri);
}
此代码始终会遇到异常。但为什么?
PS:
根据要求,这是堆栈跟踪。没有内在的例外。
bei System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
bei System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
bei System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
bei System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
bei DE.ZA.TrailerLoadingAssistant.Web.Code.WebHelper.<DownloadWebDocument>d__0.MoveNext() in C:\Users\Reichelt\source\repos\DE.ZA.TrailerLoading\DE.ZA.TrailerLoadingAssistant.Web\Code\WebHelper.cs:Zeile 28.
我意识到,如果我使用request.Credentials = CredentialCache.DefaultCredentials,它就可以工作。因此,我的凭据肯定有问题。但这绝对不是错字。
我遇到了这个问题,似乎有人在更改网络权限。一个星期使用凭据将起作用,然后第二个星期使用DefaultCredentials将起作用。真的很奇怪,因此如果服务帐户失败,我会尝试/捕获并使用DefaultCredentials,请参见代码注释:
public class SRSHelper
{
private ReportingService2005 rsServ;
private ReportingExecution2005 rsExec = new ReportingExecution2005();
private ReportParameter[] reportParameters;
private ExecutionInfo execInfo = null;
public SRSHelper(string reportUserName, string decryptedPassword, string reportDomain, string reportServerURL)
{
rsServ = new ReportingService2005(reportServerURL);
rsExec.Url = reportServerURL + @"ReportExecution2005.asmx";
System.Net.NetworkCredential creds = new System.Net.NetworkCredential();
creds.UserName = reportUserName;
creds.Password = decryptedPassword;
creds.Domain = reportDomain;
rsExec.Credentials = creds;
rsServ.Credentials = creds;
}
public ReportParameter[] GetSRSReportParameters(string reportName)
{
string report = "/Reporting/" + reportName;
bool forRendering = false;
string historyID = null;
ParameterValue[] values = null;
DataSourceCredentials[] credentials = null;
try
{
return rsServ.GetReportParameters(report, historyID, forRendering, values, credentials);
}
catch
{
//If the Service Account credentials fail to work - try the users credentials - XYZ vendor regularly change things around or the network fails or for some reason beyond our control we have to change the settings.
rsExec.Credentials = System.Net.CredentialCache.DefaultNetworkCredentials;
rsServ.Credentials = System.Net.CredentialCache.DefaultNetworkCredentials;
return rsServ.GetReportParameters(report, historyID, forRendering, values, credentials);
}
}
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