SqlParameter已包含在另一個SqlParameterCollection（EF，SqlQuery，存儲過程調用）

Question

我在我的實體框架DbContext中有一個方法List<EmployeeView> EmployeeFilter(string myFilter)。它永遠不會結束。當執行結果，在result.RawView.Message是

的SqlParameter已經被其他SqlParameterCollection

public List<EmployeeView> EmployeeFilter(string myFilter) 
      { 
       if (myFilter == null) 
        myFilter = ""; 

       SqlParameter parameter = new SqlParameter 
       { 
        ParameterName = "@filter", 
        IsNullable = true, 
        Direction = ParameterDirection.Input, 
        DbType = DbType.String, 
        Size = 1000, 
        Value = myFilter 
       }; 

       var result = Database.SqlQuery<EmployeeView>("exec EmployeeFilter @filter", parameter); 
       List<EmployeeView> employeeList = result.ToList(); 
       return employeeList; 
      } 

我試圖重寫方法如下遏制。但沒有任何幫助的

var result = Database.SqlQuery<EmployeeView>("exec EmployeeFilter @filter", parameter); 
        List<EmployeeView> employeeList = result.ToList(); 

2.

var parameters = new SqlParameter[] { new SqlParameter("@filter", SqlDbType.NVarChar, 1000) { Value = myFilter} }; 

或

SqlParameter parameter = new SqlParameter("filter", SqlDbType.NVarChar, 1000); 
      parameter.Value = myFilter; 

1.

var result = Database.SqlQuery<EmployeeView>("exec EmployeeFilter @filter", parameter).ToList(); 

代替或

SqlParameter parameter = new SqlParameter("@filter", SqlDbType.NVarChar, 1000); 
      parameter.Value = myFilter; 

或

SqlParameter parameter = new SqlParameter("@filter", myFilter); 

存儲過程的代碼：

procedure [dbo].[EmployeeFilter] 
(@filter nvarchar(1000)) 
as 

declare @countFilter as int 

if object_id('tempdb.dbo.#tempFilterValues') is not NULL 
drop table #tempFilterValues 

select display_term 
into #tempFilterValues 
from sys.dm_fts_parser(@filter, 1049, 0, 0) 

select @countFilter = count(*) 
from #tempFilterValues 


if @countFilter = 0 


--если фильтра нет, то незачем усложнять селект группировкой и поиском 
    select e.Id, e.DateOfBirth, e.IdentityCodeChar, e.FirstName, e.SecondName, e.Surname, e.Age, 
    e.ShortAddress, e.Position 
    from dbo.EmployeeView e 
else 
    begin 
    --если в фильтре одна запись 
    --появился поиск по like 
     if @countfilter = 1 
      select e.Id, e.DateOfBirth, e.IdentityCodeChar, e.FirstName, e.SecondName, e.Surname, e.Age, 
      e.ShortAddress, e.Position 
      from dbo.EmployeeView e 
      inner join #tempFilterValues as ParseString 
      on e.Position + e.FirstName + e.SecondName + e.Surname like '%'+ ParseString.display_term +'%' 
     else 
     --если несколько значений в фильтре 
     --like 
     --появляется группировка 
      select e.Id, e.DateOfBirth, e.IdentityCodeChar, e.FirstName, e.SecondName, e.Surname, e.Age, 
      e.ShortAddress, e.Position 
      from dbo.EmployeeView e 
       inner join #tempFilterValues as ParseString 
       on eo.Position+p.FirstName + p.SecondName + p.Surname like '%'+ ParseString.display_term +'%' 
      group by e.Id, e.DateOfBirth, e.IdentityCodeChar, e.FirstName, e.SecondName, e.Surname, e.Age, 
      e.ShortAddress, e.Position 
      having count(e.Id) > 1 
    end 

異常逮住：

error "System.Data.Entity.Core.EntityCommandExecutionException: The data reader is incompatible with the specified 'GTIApp.Models.EmployeeView'. A member of the type, 'AgeCount', does not have a corresponding column in the data reader with the same name.\r\n в System.Data.Entity.Core.Query.InternalTrees.ColumnMapFactory.GetMemberOrdinalFromReader(DbDataReader storeDataReader, EdmMember member, EdmType currentType, Dictionary`2 renameList)\r\n в System.Data.Entity.Core.Query.InternalTrees.ColumnMapFactory.GetColumnMapsForType(DbDataReader storeDataReader, EdmType edmType, Dictionary`2 renameList)\r\n в System.Data.Entity.Core.Query.InternalTrees.ColumnMapFactory.CreateColumnMapFromReaderAndType(DbDataReader storeDataReader, EdmType edmType, EntitySet entitySet, Dictionary`2 renameList)\r\n в System.Data.Entity.Core.Objects.ObjectContext.InternalTranslate[TElement](DbDataReader reader, String entitySetName, MergeOption mergeOption, Boolean streaming, EntitySet& entitySet, TypeUsage& edmType)\r\n в System.Data.Entity.Core.Objects.ObjectContext.ExecuteStoreQueryInternal[TElement](String commandText, String entitySetName, ExecutionOptions executionOptions, Object[] parameters)\r\n в System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass65`1.<ExecuteStoreQueryReliably>b__64()\r\n в System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)\r\n в System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass65`1.<ExecuteStoreQueryReliably>b__63()\r\n в System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)\r\n в System.Data.Entity.Core.Objects.ObjectContext.ExecuteStoreQueryReliably[TElement](String commandText, String entitySetName, ExecutionOptions executionOptions, Object[] parameters)\r\n в System.Data.Entity.Core.Objects.ObjectContext.ExecuteStoreQuery[TElement](String commandText, ExecutionOptions executionOptions, Object[] parameters)\r\n в System.Data.Entity.Internal.InternalContext.<>c__DisplayClass14`1.<ExecuteSqlQuery>b__13()\r\n в System.Data.Entity.Internal.LazyEnumerator`1.MoveNext()\r\n в System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)\r\n в System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)\r\n в GTIApp.Models.DbPersonnel.EmployeeFilter(String myFilter)" string 

請幫助！

Answer 1

SqlQuery需要值的數組，而不是SqlParameter對象。每個值都將被包裝在一個SqlParameter中。在Entity Framework Raw SQL Queries的例子顯示瞭如何傳遞一個整數值：

using (var context = new BloggingContext()) 
{ 
    var blogId = 1; 

    var blogs = context.Blogs.SqlQuery("dbo.GetBlogById @p0", blogId).Single(); 
} 

更新

由於EVK指出的，可以使用的SqlParameter對象傳遞命名參數。我沒有注意到這一點，因爲文檔格式嚴重破碎。從單段註釋部分中提取文本：

或者，您還可以構造一個DbParameter並將其提供給SqlQuery。這使您可以在SQL查詢字符串使用命名參數：

context.Database.SqlQuery(typeof(Post), 
        "SELECT * FROM dbo.Posts WHERE Author = @author", 
        new SqlParameter("@author", userSuppliedAuthor)); 

參數名字已經在這種情況下