DAL C＃错误'无法隐式转换类型' [英] DAL C# error 'cannot implicitly convert type'

问题描述

  public 列表< BOL.MonthlyEvent>列表（字符串 subsidiary_cd，字符串 costcenter）
 {
 oConnection.ConnectionString = ConnectionString ; 
 oConnection.Open（）; 
 BOL.MonthlyEvent MEvent =  new  BOL.MonthlyEvent（）; 
 SqlCommand oCommand =  new  SqlCommand（）; 
 oCommand.Connection = oConnection; 
 oCommand.CommandType = CommandType.StoredProcedure; 
 oCommand.CommandText =   Monthly_Event_LIST1; 
 oCommand.Parameters.Add（ new  SqlParameter（  @SUBS_CD，subsidiary_cd））; 
 oCommand.Parameters.Add（ new  SqlParameter（  @CostCenter，costcenter））; 
 SqlDataReader oReader = oCommand.ExecuteReader（）; 
  while （oReader.Read（））
 {
 
  if （oReader [  Event_Date]。ToString（）==  ）{Event.EventDate =  null ; }  else  {MEvent.EventDate = Convert.ToDateTime（oReader [  EVENT_DATE]的ToString（））; } 
 MEvent.EventTitle = oReader.IsDBNull（oReader.GetOrdinal（  EventTitle）） ？  ：oReader [  EVENTTITLE]的ToString（）; 
 MEvent.EventDescription = oReader.IsDBNull（oReader.GetOrdinal（  Event_Description））？  ：oReader [  EVENT_DESCRIPTION]的ToString（）; 
} 
 oReader.Close（）; 
 oConnection.Close（）; 
  return  MEvent; 
} 
 

错误：

无法隐式转换类型'  BOL.MonthlyEvent' to '  system.collections.generic.list< BOL.MonthlyEvent>' 

我是什么尝试过：



无法将类型隐式转换为system.collections.generic.list

解决方案

< blockquote>您的方法名称是List与System.Collections.Generic.List冲突。

解决方案是： -

更改方法名称列表到任何不引用预定义关键字或类名的东西....

public List<BOL.MonthlyEvent> List(string subsidiary_cd,string costcenter)
{
    oConnection.ConnectionString = ConnectionString;
    oConnection.Open();
    BOL.MonthlyEvent MEvent = new BOL.MonthlyEvent();
    SqlCommand oCommand = new SqlCommand();
    oCommand.Connection = oConnection;
    oCommand.CommandType = CommandType.StoredProcedure;
    oCommand.CommandText = "Monthly_Event_LIST1";
    oCommand.Parameters.Add(new SqlParameter("@SUBS_CD", subsidiary_cd));
    oCommand.Parameters.Add(new SqlParameter("@CostCenter", costcenter));
    SqlDataReader oReader = oCommand.ExecuteReader();
    while (oReader.Read())
    {

        if (oReader["Event_Date"].ToString() == "") { Event.EventDate = null; } else { MEvent.EventDate = Convert.ToDateTime(oReader["Event_Date"].ToString()); }
        MEvent.EventTitle = oReader.IsDBNull(oReader.GetOrdinal("EventTitle")) ? "" : oReader["EventTitle"].ToString();
        MEvent.EventDescription = oReader.IsDBNull(oReader.GetOrdinal("Event_Description")) ? "" : oReader["Event_Description"].ToString();
    }
    oReader.Close();
    oConnection.Close();
    return MEvent;
}

error :

cannot implicitly convert type'BOL.MonthlyEvent' to 'system.collections.generic.list<BOL.MonthlyEvent>'

What I have tried:

cannot implicitly convert type to system.collections.generic.list

解决方案

Your Method name is "List" which conflict with "System.Collections.Generic.List".
Solution is:-
Change the method name List to any thing which doesn't refer to Predefined keyword or class name....

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