將多個錶轉換爲數據集

Question

我的問題似乎很簡單，但對我來說卻變得單調乏味。在我的項目中，我有一個充當數據訪問層的DBML文件。還有一種將現有結果轉換爲數據集的實用方法。下面是我的方法：

#region To convert from LINQ to dataset 
     /// <summary> 
     /// Function convert linq to Dataset 
     /// </summary> 
     public static DataSet LINQToDataTable<T>(IEnumerable<T> varlist) 
     { 
      DataSet ds = new DataSet(); 
      //Creating an object of datatable 
      DataTable dtReturn = new DataTable(); 

      dtReturn.Rows.Clear(); 

      // column names 
      PropertyInfo[] oProps = null; 

      if (varlist == null) return ds; 

      foreach (T rec in varlist) 
      { 
       // Use reflection to get property names, to create table, Only first time, others will follow 
       if (oProps == null) 
       { 
        oProps = ((Type)rec.GetType()).GetProperties(); 
        foreach (PropertyInfo pi in oProps) 
        { 
         Type colType = pi.PropertyType; 

         if ((colType.IsGenericType) && (colType.GetGenericTypeDefinition() 
         == typeof(Nullable<>))) 
         { 
          colType = colType.GetGenericArguments()[0]; 
         } 

         dtReturn.Columns.Add(new DataColumn(pi.Name, colType)); 
        } 
       } 

       DataRow dr = dtReturn.NewRow(); 

       foreach (PropertyInfo pi in oProps) 
       { 
        dr[pi.Name] = pi.GetValue(rec, null) == null ? DBNull.Value : pi.GetValue 
        (rec, null); 
       } 

       dtReturn.Rows.Add(dr); 
      } 
      ds.Tables.Add(dtReturn); 
      return ds; 
     } 
     #endregion 

現在我的存儲過程中的一個具有運行從而從那裏返回三個表三種不同的選擇查詢。當我在後面的代碼上返回結果並快速觀察結果時，它給了我三個中唯一的一個表。

什麼是可能的解決方案。請幫助我。我認爲上述LOC可能存在一些問題。

SQL查詢，更新調用存儲過程

/// <summary> 
     /// 
     /// </summary> 
     /// <returns></returns> 
     public DataSet GetTenantPropertyDetailsForAgreement(int tenantId, int propertyId,int billingPlanId) 
     { 
      DataSet ds = new DataSet(); 
      try 
      { 
       using (objDataManagerDataContext = new DataManagerDataContext()) 
       { 
        ds = Utility.LINQToDataTable(objDataManagerDataContext.usp_GetTenantPropertyDetailsForAgreement(tenantId,propertyId,billingPlanId)); 
       } 
      } 
      catch (Exception ex) 
      { 
       SaveLogger.WriteError(ex.ToString()); 
      } 
      return ds; 
     } 

DBML文件的方法

[global::System.Data.Linq.Mapping.FunctionAttribute(Name="dbo.usp_GetTenantPropertyDetailsForAgreement")] 
      public IEnumerable<usp_GetTenantPropertyDetailsForAgreementResult> usp_GetTenantPropertyDetailsForAgreement([global::System.Data.Linq.Mapping.ParameterAttribute(Name = "TenantId", DbType = "Int")] System.Nullable<int> tenantId, [global::System.Data.Linq.Mapping.ParameterAttribute(Name = "PropertyDetailsId", DbType = "Int")] System.Nullable<int> propertyDetailsId, [global::System.Data.Linq.Mapping.ParameterAttribute(Name = "BillingPlanId", DbType = "Int")] System.Nullable<int> billingPlanId) 
      { 
       IExecuteResult result = this.ExecuteMethodCall(this, ((MethodInfo)(MethodInfo.GetCurrentMethod())), tenantId, propertyDetailsId, billingPlanId); 
       return ((IEnumerable<usp_GetTenantPropertyDetailsForAgreementResult>)(result.ReturnValue)); 
      } 

Answer 1

嘗試沒有LINQ，如果你能

ALTER PROCEDURE [dbo].[usp_GetTenantPropertyDetailsForAgreement] 
    @TenantId INT, 
    @PropertyDetailsId INT, 
    @BillingPlanId INT 
) 
AS 
BEGIN 

    -- Select Tenant's Name and his/her household member info from the two tables 
    SELECT  (tbl_MSTTenantPersonalInfo.FirstName + ' ' + ISNULL(tbl_MSTTenantPersonalInfo.MiddleInitial,'') + ' ' + tbl_MSTTenantPersonalInfo.LastName) AS Tenant, 
       (ISNULL(tbl_TenantFamilyMemberInfo.FirstName,'') + ' ' + ISNULL(tbl_TenantFamilyMemberInfo.MiddleName,'') + ' ' + ISNULL(tbl_TenantFamilyMemberInfo.LastName,'')) AS FMName 
    FROM  tbl_MSTTenantPersonalInfo LEFT JOIN 
       tbl_TenantFamilyMemberInfo 
    ON   tbl_MSTTenantPersonalInfo.TenantPersonalInfoID = tbl_TenantFamilyMemberInfo.TenantPersonalInfoID 
    WHERE  tbl_MSTTenantPersonalInfo.TenantPersonalInfoID = @TenantId AND (tbl_MSTTenantPersonalInfo.IsDelete = 0) 



    SELECT  tbl_PropertyConstructionInfo.BedRoomsNo, 
       (ISNULL(tbl_MSTPropertyDetails.Area,'')+''+ ISNULL(tbl_MSTPropertyDetails.Project,'')+' '+ ISNULL(tbl_MSTPropertyDetails.Unit,'')) AS Project, 
       (tbl_MSTPropertyDetails.Address+' <br/>'+ ISNULL(tbl_MSTPropertyDetails.Address2,'')+' <br/>'+tbl_MSTPropertyDetails.City+' '+tbl_MSTPropertyDetails.State 
        +' '+ tbl_MSTPropertyDetails.Zip) AS PropertyAdress 
    FROM   tbl_MSTPropertyDetails INNER JOIN 
         tbl_PropertyConstructionInfo ON tbl_MSTPropertyDetails.PropertyDetailsID = tbl_PropertyConstructionInfo.PropertyDetailsID 
    WHERE  tbl_MSTPropertyDetails.PropertyDetailsID = @PropertyDetailsId AND tbl_MSTPropertyDetails.IsDelete = 0 



    SELECT  BiilingDayOfMonth, LateFeeAmount, LateFeeAppliedDayofMonth 
    FROM  tbl_MSTBillingPlan 
    WHERE  BillingplanID = @BillingPlanId 

END 

方法。只需定期ado.net。這樣你就不需要從linq轉換到數據集。