發送查詢模型庫

請幫忙。我在ASP.NET MVC新，我試圖發送一個查詢到存儲庫，但它給了我一個錯誤：發送查詢模型庫

Errr 3 Cannot implicitly convert type 'System.Collections.Generic.List' to 'System.Collections.Generic.IList'. An explicit conversion exists (are you missing a cast?)

我使用的是一個架構類，只有我需要的列。這是我用於存儲庫的代碼。

public class SSGridRepository : SSGridIRepository 
{ 
    private DataClassesSSDataContext db; 

    public SSGridRepository() 
    { 
     db = new DataClassesSSDataContext(); 
    } 

    public IList<SSQuerySchema> ListAll() 
    { 

     var SSQuery = (from HISTORies in db.HISTORies 
         join SSes in db.SSes on HISTORies.WO equals SSes.WO 
         join SSCUSTOMs in db.SSCUSTOMs on SSes.WO equals SSCUSTOMs.WO 
         join StatusTables in db.StatusTables on new { STATUS = SSes.STATUS } equals new { STATUS = StatusTables.Status } 
         join StatusTable_1 in db.StatusTables on new { OLDSTATUS = HISTORies.OLDSTATUS } equals new { OLDSTATUS = StatusTable_1.Status } 
         join StatusTable_2 in db.StatusTables on new { NEWSTATUS = HISTORies.NEWSTATUS } equals new { NEWSTATUS = StatusTable_2.Status } 
         where 
         HISTORies.OLDSTATUS == "m" && 
         HISTORies.NEWSTATUS == "n" && 
         HISTORies.ACTION == "Change Job Status" && 
         HISTORies.OLDSTATUS != HISTORies.NEWSTATUS && 
         HISTORies.DATE.Value.Year == Convert.ToDateTime(DateTime.Now).Year || 
         HISTORies.OLDSTATUS != HISTORies.NEWSTATUS && 
         HISTORies.NEWSTATUS == "m" && 
         HISTORies.ACTION == "Checked In Work Order" && 
         HISTORies.DATE.Value.Year == Convert.ToDateTime(DateTime.Now).Year 
         orderby 
         HISTORies.DATE 
         select new 
         { 
          HISTORies.WO, 
          SSes.TITLE, 
          SSes.DESCRIPT, 
          SSCUSTOMs.CUSTNAME, 
          SSes.STAKER, 
          HISTORies.USER, 
          SSes.STATUS, 
          HISTORies.OLDSTATUS, 
          HISTORies.NEWSTATUS, 
          CURRENT_STATUS = StatusTables.Description, 
          OLD_STATUS = StatusTable_1.Description, 
          NEW_STATUS = StatusTable_2.Description, 
          HISTORies.DATE.Value.Month, 
          HISTORies.DATE 
         }).Distinct(); 
     return SSQuery.ToList(); 
    }   
}

來源

2014-03-13 CesarD

錯誤在最後一行。 SSQuery.ToList（）; – CesarD

新的實例在你LINQ你這樣做：

select new { 
          HISTORies.WO, 
          SSes.TITLE, 
          SSes.DESCRIPT, 
          SSCUSTOMs.CUSTNAME, 
          SSes.STAKER, 
          HISTORies.USER, 
          SSes.STATUS, 
          HISTORies.OLDSTATUS, 
          HISTORies.NEWSTATUS, 
          CURRENT_STATUS = StatusTables.Description, 
          OLD_STATUS = StatusTable_1.Description, 
          NEW_STATUS = StatusTable_2.Description, 
          HISTORies.DATE.Value.Month, 
          HISTORies.DATE 
         }

這是一個動態類型，所以它不會匹配你的返回類型List<SSQuerySchema>

嘗試初始化您在Linq中指定的類型並設置屬性當然。

select new SSQuerySchema { 
           // initialize all properties here 
          }

來源

2014-03-13 00:19:37 shenku

如果使用初始化程序，則需要顯式指定屬性名稱。 – Kenneth

@Kenneth yup，你是對的懶惰複製粘貼 – shenku

這工作完美，謝謝。 – CesarD

你試圖返回IList<SSQuerySchema>，但實際的返回類型爲IList<dynamic>（你不選擇SSQuerySchema的，但一個匿名類型。

您應該做的函數的返回類型IList<dynamic>或修改您的選擇創建的SSQuerySchema

來源

2014-03-13 00:19:20 Kenneth

發送查詢模型庫

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