實體框架6從存儲過程中獲得完整的返回值

Question

我的ASP.Net MVC應用程序需要執行一個存儲過程，以檢查基於一組參數的重複工作訂單。存儲過程龐大而複雜，因此將其轉換爲Linq to SQL查詢是不可能的。此外，我們不使用實體數據模型（EDMX）文件;我們只有領域模型，視圖模型和數據上下文。存儲過程具有以下特徵：

CREATE PROCEDURE [dbo].[spGetDupWOs] 
    -- Add the parameters for the stored procedure here 
    @ProjectName VARCHAR(200) = '""', 
    @City VARCHAR(100) = '', 
    @State VARCHAR(100) = '', 
    @ProjectNumber VARCHAR(50) = '', 
    @County VARCHAR(50) = '', 
    @Customer VARCHAR(400) = '', 
    @QuoteRecipients VARCHAR(400) = NULL, 
    @ProjectID BIGINT = NULL 
    ... 

    SELECT DuplicateID, ProjectNameMatchRank, ProjectNameMatch, ProjectName ... 

我試圖調用它在我的控制器，如：

IEnumerable<DuplicateProjects> duplicateCheckResults = db.Database.SqlQuery< DuplicateProjects>("spGetDupWOs", new { ProjectName = ProjectName, City = City, State = propal.State, ProjectNumber = ProjectNumber, County = County, Owner = Owner, BID_QuoteRecipients = QuoteRecipients, ProjectID = -1 }); 

，並得到一個例外，當我運行此類似：

No mapping exists from object type <>f__AnonymousType6`8[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]] to a known managed provider native type.

我究竟做錯了什麼？

---

更新：當我將所有傳遞的參數更改爲ObjectParamter時，我仍然收到相同的錯誤消息。

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更新2：

我重構的碼位。下面是它看起來像現在：

  List<SqlParameter> spl = new List<SqlParameter>(); 

      var ProjectNameParameter = new SqlParameter("ProjectName", project.ProjectName); 
      spl.Add(ProjectNameParameter); 
      var CityParameter = new SqlParameter("City", project.City); 
      spl.Add(CityParameter); 
      var StateParameter = new SqlParameter("State", project.State); 
      spl.Add(StateParameter); 
      var ProposalNumberParameter = new SqlParameter("ProjectNumber", project.ProjectNumber); 
      spl.Add(ProposalNumberParameter); 
      var CountyParameter = new SqlParameter("County", project.County); 
      spl.Add(CountyParameter); 
      var OwnerParameter = new SqlParameter("Owner", project.Owner); 
      spl.Add(OwnerParameter); 
      var BidRecipientParameter = QuoteRecipients != null ? 
       new SqlParameter("QuoteRecipients", QuoteRecipients) : 
       new SqlParameter("QuoteRecipients", ""); 
      spl.Add(BidRecipientParameter); 
      var ProjectIDParameter = new SqlParameter("ProjectID", typeof(long)); 
      spl.Add(ProposalIDParameter); 

      IEnumerable<DuplicateProposals> duplicateCheckResults = db.Database.SqlQuery<DuplicateProposals>("spGetDupWOs ProjectName = {0} City = {1}, State = {2}, ProjectNumber = {3}, County = {4}, Owner = {5}, QuoteRecipients = {6}, ProjectID = {7}", 
       spl.ToArray()); 

現在我得到的錯誤：

SqlParameter有已被另一SqlParameterCollection遏制。

Answer 1

此外參數SqlQuery<T>查詢字符串後構成params數組，該方法將使用回填查詢字符串編號參數參數，就像String.Format一樣。由於您傳遞的是匿名對象，因此該方法試圖將其視爲單個參數，並且無法將其轉換爲字符串。所以，是的，你要麼需要使用SqlParameter手動添加params中，改變您的呼叫處理它與該方法兼容的方式：

db.Database.SqlQuery< DuplicateProjects>(
    "spGetDupWOs @ProjectName = {0}, @City = {1}, @State = {2}, @ProjectNumber = {3}, @Country = {4}, @Owner = {5}, @BID_QuoteRecipients = {6}, @ProjectID = {7}", 
    ProjectName, 
    City, 
    propal.State, 
    ProjectNumber, 
    County, 
    Owner, 
    QuoteRecipients, 
    -1 
); 

自由間距增加了更好的可讀性