Web应用程序错误：序列包含多个元素

我有一个web应用程序工作正常，但不再工作。它甚至可以在我的开发计算机上工作（连接到本地数据库），但不能用于生产。因此，在我的开发计算机上，我更改连接字符串以打击生产数据库，并得到错误：序列包含多个元素。Web应用程序错误：序列包含多个元素

我相信它必须与数据库有关，但我不知道如何弄清楚它是什么，它里面有近千行数据。

下面是获取数据的linq语句。关于如何解决这个问题的任何想法？

在此先感谢

protected void lnqItems_Selecting(object sender, LinqDataSourceSelectEventArgs e) 
{ 
    DocksideValidationDataContext db = new DocksideValidationDataContext(); 

    DateTime startDate = (radStartDate.SelectedDate.HasValue) 
     ? radStartDate.SelectedDate.Value 
     : DateTime.Parse("1/1/1900"); 
    DateTime endDate = (radEndDate.SelectedDate.HasValue) 
     ? radEndDate.SelectedDate.Value 
     : DateTime.Parse("1/1/2500"); 
    int prevalNum = (txtSummaryFormNumber.Text.Trim() == "") 
     ? -1 
     : Convert.ToInt32(txtSummaryFormNumber.Text.Trim()); 

    e.Result = (from x in db.SummaryForms 
       where (x.SummaryFormId == prevalNum 
        || (prevalNum == -1) 
        && (x.SampleDate >= startDate.Date) 
        && (x.SampleDate <= endDate.Date) 
        && (x.StateId == Convert.ToInt32(ddlState.SelectedValue))) 
       orderby (x.SampleDate) descending 
       select x).AsEnumerable() 
         .Select(x => new 
         { 
          x.SummaryFormId, 
          x.SampleDate, 
          DockName = x.Dock.Code + " " + x.Dock.Name, 
          Status = GetStatus(x), 
          Color = GetStatusColor(GetStatus(x)) 
         }) 
         .Where(x => ((prevalNum != -1 
          || cboFilter.Text == "All") 
          || (x.Status == cboFilter.Text))); 
}

没有它发生在我，但我不认为这将是有益的。下面是它：

System.InvalidOperationException: Sequence contains more than one element 

Generated: Sat, 24 Sep 2011 15:57:41 GMT 

System.Web.HttpUnhandledException (0x80004005): Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidOperationException: Sequence contains more than one element 
    at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source) 
    at System.Data.Linq.EntityRef`1.get_Entity() 
    at Secure_SummaryForms.<GetStatus>b__4(SummaryFormVessel z) 
    at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext() 
    at System.Linq.Enumerable.Any[TSource](IEnumerable`1 source) 
    at Secure_SummaryForms.GetStatus(SummaryForm x) 
    at Secure_SummaryForms.<lnqItems_Selecting>b__0(SummaryForm x) 
    at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext() 
    at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext() 
    at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) 
    at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source) 
    --- End of inner exception stack trace --- 
    at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner) 
    at System.RuntimeMethodHandle.InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeType typeOwner) 
    at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks) 
    at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) 
    at System.Web.UI.WebControls.QueryableDataSourceHelper.ToList(IQueryable query, Type dataObjectType) 
    at System.Web.UI.WebControls.LinqDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) 
    at System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) 
    at System.Web.UI.WebControls.DataBoundControl.PerformSelect() 
    at System.Web.UI.WebControls.BaseDataBoundControl.DataBind() 
    at System.Web.UI.WebControls.GridView.DataBind() 
    at System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() 
    at System.Web.UI.WebControls.CompositeDataBoundControl.CreateChildControls() 
    at System.Web.UI.Control.EnsureChildControls() 
    at System.Web.UI.WebControls.GridView.get_Rows() 
    at Secure_SummaryForms.Page_Load(Object sender, EventArgs e) 
    at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) 
    at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) 
    at System.Web.UI.Control.OnLoad(EventArgs e) 
    at System.Web.UI.Control.LoadRecursive() 
    at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) 
    at System.Web.UI.Page.HandleError(Exception e) 
    at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) 
    at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) 
    at System.Web.UI.Page.ProcessRequest() 
    at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) 
    at System.Web.UI.Page.ProcessRequest(HttpContext context) 
    at ASP.secure_summaryforms_aspx.ProcessRequest(HttpContext context) 
    at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() 
    at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) 


Server Variables 
Name Value 
ALL_HTTP HTTP_CONNECTION:keep-alive HTTP_ACCEPT:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 HTTP_ACCEPT_CHARSET:ISO-8859-1,utf-8;q=0.7,*;q=0.7 HTTP_ACCEPT_ENCODING:gzip, deflate HTTP_ACCEPT_LANGUAGE:en-us,en;q=0.5 HTTP_COOKIE:ASP.NET_SessionId=yka231rdr1r3yqv0nmbhz1nh; .POWERBASECOOKIE=5FC2CF98E578B444ACA6B75A382EAEF31EFC781DA11AF7884B360A82E544539BEC5E5BB62DD012A1D6E7005869FFF8A205D632FB724AB01EFDBED78A9A035C76B22250F8FF0BCC3AD9AB56C4EEC44C05159110DF95A6344888CB3300B642E312F3B152475CD4FA631C0000699763AE173978375D598154CE85AEF83C81E1FAF82842DF48F1D9AC97872F09FFCA33B22B; .ASPXROLES=IS-YIxYt7iXk72HXdLNE18SBwgsEd2wo3D4GfRI72jYdSmmLhUxfzBMMpFYXg5CjiowldcwSKolBjaP8jrMUgh5-rQWjQhUTY02VS3IhD5Xcav_B-d-MiaumYD-0JMWFR9-1xcP2eHQXLpnZlXzcZXhwh6G2mEDVoNZGls8MNK8bAVlo2WuTqReMmk1GTyu5duoZzh_fCs1S6AZuhWY9bwdi28kA_lfoyp4SCm2zLgNddjhbsLmgN5oopdPo9-oONS7Z5br51qYu5sS9vq-hm_TbHhHL_W7XbIKo3pJccZ1-VXkLbtIAiS_hSccjFmk1f3ttWhUnmULJVQaNNepOHofbivSEQvhQQxX-f5hpGI4K-9FqcJ-kFAjw93CrnZ2rtu6n8i3tblPEDQeAbd1JkSJjmKGpSH_4PVh1MsXNDZwSSnbBHqTaO9iKiVAvUWvANLbBxmOc3w0SfP4DUbLtl3YZVCbG_JWr5s0f5Is8scr7Nc-AxK2HEzjNVber1EofJK48eLaVJPyvm-858Yhtp5XgqMeJQUwh5l9LYeZNbc8kqxPG7kOl0Zq7q8407I230 HTTP_HOST:docksidevalidation.org HTTP_REFERER:http://docksidevalidation.org/secure/default.aspx HTTP_USER_AGENT:Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0.2) Gecko/20100101 Firefox/6.0.2 
ALL_RAW Connection: keep-alive Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Accept-Encoding: gzip, deflate Accept-Language: en-us,en;q=0.5 Cookie: ASP.NET_SessionId=yka231rdr1r3yqv0nmbhz1nh; .POWERBASECOOKIE=5FC2CF98E578B444ACA6B75A382EAEF31EFC781DA11AF7884B360A82E544539BEC5E5BB62DD012A1D6E7005869FFF8A205D632FB724AB01EFDBED78A9A035C76B22250F8FF0BCC3AD9AB56C4EEC44C05159110DF95A6344888CB3300B642E312F3B152475CD4FA631C0000699763AE173978375D598154CE85AEF83C81E1FAF82842DF48F1D9AC97872F09FFCA33B22B; .ASPXROLES=IS-YIxYt7iXk72HXdLNE18SBwgsEd2wo3D4GfRI72jYdSmmLhUxfzBMMpFYXg5CjiowldcwSKolBjaP8jrMUgh5-rQWjQhUTY02VS3IhD5Xcav_B-d-MiaumYD-0JMWFR9-1xcP2eHQXLpnZlXzcZXhwh6G2mEDVoNZGls8MNK8bAVlo2WuTqReMmk1GTyu5duoZzh_fCs1S6AZuhWY9bwdi28kA_lfoyp4SCm2zLgNddjhbsLmgN5oopdPo9-oONS7Z5br51qYu5sS9vq-hm_TbHhHL_W7XbIKo3pJccZ1-VXkLbtIAiS_hSccjFmk1f3ttWhUnmULJVQaNNepOHofbivSEQvhQQxX-f5hpGI4K-9FqcJ-kFAjw93CrnZ2rtu6n8i3tblPEDQeAbd1JkSJjmKGpSH_4PVh1MsXNDZwSSnbBHqTaO9iKiVAvUWvANLbBxmOc3w0SfP4DUbLtl3YZVCbG_JWr5s0f5Is8scr7Nc-AxK2HEzjNVber1EofJK48eLaVJPyvm-858Yhtp5XgqMeJQUwh5l9LYeZNbc8kqxPG7kOl0Zq7q8407I230 Host: docksidevalidation.org Referer: http://docksidevalidation.org/secure/default.aspx User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0.2) Gecko/20100101 Firefox/6.0.2 
APPL_MD_PATH /LM/W3SVC/1154673598/Root 
APPL_PHYSICAL_PATH C:\Inetpub\Websites\DocksideValidation\Website\ 
AUTH_TYPE Forms 
AUTH_USER admin 
AUTH_PASSWORD  
LOGON_USER 
REMOTE_USER admin 
CERT_COOKIE 
CERT_FLAGS 
CERT_ISSUER 
CERT_KEYSIZE  
CERT_SECRETKEYSIZE 
CERT_SERIALNUMBER  
CERT_SERVER_ISSUER 
CERT_SERVER_SUBJECT 
CERT_SUBJECT  
CONTENT_LENGTH 0 
CONTENT_TYPE  
GATEWAY_INTERFACE CGI/1.1 
HTTPS off 
HTTPS_KEYSIZE  
HTTPS_SECRETKEYSIZE 
HTTPS_SERVER_ISSUER 
HTTPS_SERVER_SUBJECT  
INSTANCE_ID 1154673598 
INSTANCE_META_PATH /LM/W3SVC/1154673598 
LOCAL_ADDR 192.168.1.131 
PATH_INFO /secure/SummaryForms.aspx 
PATH_TRANSLATED C:\Inetpub\Websites\DocksideValidation\Website\secure\SummaryForms.aspx 
QUERY_STRING  
REMOTE_ADDR 66.186.243.74 
REMOTE_HOST 66.186.243.74 
REMOTE_PORT 50339 
REQUEST_METHOD GET 
SCRIPT_NAME /secure/SummaryForms.aspx 
SERVER_NAME docksidevalidation.org 
SERVER_PORT 80 
SERVER_PORT_SECURE 0 
SERVER_PROTOCOL HTTP/1.1 
SERVER_SOFTWARE Microsoft-IIS/6.0 
URL /secure/SummaryForms.aspx 
HTTP_CONNECTION keep-alive 
HTTP_ACCEPT text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 
HTTP_ACCEPT_CHARSET ISO-8859-1,utf-8;q=0.7,*;q=0.7 
HTTP_ACCEPT_ENCODING gzip, deflate 
HTTP_ACCEPT_LANGUAGE en-us,en;q=0.5 
HTTP_COOKIE ASP.NET_SessionId=yka231rdr1r3yqv0nmbhz1nh; .POWERBASECOOKIE=5FC2CF98E578B444ACA6B75A382EAEF31EFC781DA11AF7884B360A82E544539BEC5E5BB62DD012A1D6E7005869FFF8A205D632FB724AB01EFDBED78A9A035C76B22250F8FF0BCC3AD9AB56C4EEC44C05159110DF95A6344888CB3300B642E312F3B152475CD4FA631C0000699763AE173978375D598154CE85AEF83C81E1FAF82842DF48F1D9AC97872F09FFCA33B22B; .ASPXROLES=IS-YIxYt7iXk72HXdLNE18SBwgsEd2wo3D4GfRI72jYdSmmLhUxfzBMMpFYXg5CjiowldcwSKolBjaP8jrMUgh5-rQWjQhUTY02VS3IhD5Xcav_B-d-MiaumYD-0JMWFR9-1xcP2eHQXLpnZlXzcZXhwh6G2mEDVoNZGls8MNK8bAVlo2WuTqReMmk1GTyu5duoZzh_fCs1S6AZuhWY9bwdi28kA_lfoyp4SCm2zLgNddjhbsLmgN5oopdPo9-oONS7Z5br51qYu5sS9vq-hm_TbHhHL_W7XbIKo3pJccZ1-VXkLbtIAiS_hSccjFmk1f3ttWhUnmULJVQaNNepOHofbivSEQvhQQxX-f5hpGI4K-9FqcJ-kFAjw93CrnZ2rtu6n8i3tblPEDQeAbd1JkSJjmKGpSH_4PVh1MsXNDZwSSnbBHqTaO9iKiVAvUWvANLbBxmOc3w0SfP4DUbLtl3YZVCbG_JWr5s0f5Is8scr7Nc-AxK2HEzjNVber1EofJK48eLaVJPyvm-858Yhtp5XgqMeJQUwh5l9LYeZNbc8kqxPG7kOl0Zq7q8407I230 
HTTP_HOST docksidevalidation.org 
HTTP_REFERER http://docksidevalidation.org/secure/default.aspx 
HTTP_USER_AGENT Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0.2) Gecko/20100101 Firefox/6.0.2 

Powered by ELMAH, version 1.1.11517.2009. Copyright (c) 2004-9, Atif Aziz. All rights reserved. Licensed under Apache License, Version 2.0.

来源

2011-09-24 user962926

您是否曾想过发布您收到的实际完整的例外情况？ –

确切的错误和堆栈跟踪？ –

难道你没有任何DataLoadOptions附加到你的数据上下文类吗？ –

例外建议您使用LINQ查询集包含符合您查询多个项目，和你调用SingleOrDefault它抛出一个异常出现这样的情况。

您可能正在寻找使用FirstOrDefault来代替查询的第一个匹配项。

虽然很难说，因为我没有看到在您的粘贴代码示例中调用SingleOrDefault。

来源

2011-09-26 15:27:43 AndrewC

就像你一样，我在调用堆栈中看到'SingleOrDefault'，但看不到他的代码。我有类似的问题;在我的代码中没有'SingleOrDefault'，但是当调用LINQ枚举的MoveNext方法时，它调用SingleOrDefault，我不知道为什么，也没有任何代码的可见性（也许我需要打开.Net Framework源码步进对于MS'代码）。 – Zarepheth

我已经解决了这个问题！感谢您的输入。这个问题是插入数据库时的重复记录，当程序将数据拉回时，它只是假设将一条记录拉回来，并且它得到了2.谢谢！

来源

2011-09-26 16:24:15 user962926

那你为什么不接受@ AndrewC的回答。我相信这个完美的答案。 – Scorpion

Web应用程序错误：序列包含多个元素

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