非静态字段、方法或属性“Competition.DataLayer”需要对象引用
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【中文标题】非静态字段、方法或属性“Competition.DataLayer”需要对象引用【英文标题】：An object reference is required for the non-static field, method, or property 'Competition.DataLayer 【发布时间】：2014-01-30 08:30:48 【问题描述】：***
namespace Competition.DataLayer
using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.htmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
public class DataManager
public DataManager()
private SqlConnection OpenConnection()
SqlConnection oCon = new SqlConnection("competition_str");
oCon.Open();
return oCon;
private void CloseConnection(SqlConnection oCon)
if (oCon != null)
oCon.Close();
oCon.Dispose();
public object ExecuteNonQuery(string sSQLText, SqlParameter [] oParam)
SqlConnection oCn = OpenConnection();
SqlCommand cmd = new SqlCommand();//sSQLText, oCn);
cmd.Connection = oCn;
cmd.CommandText = sSQLText;
if (oParam != null && oParam.Length > 0)
foreach(SqlParameter oOneParameter in oParam)
cmd.Parameters.Add(oOneParameter);
object oRetVal = cmd.ExecuteNonQuery();
CloseConnection(oCn);
return oRetVal;
业务逻辑层代码-
namespace Competition.BusinessLogicLayer
using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using Competition.DataLayer;
#region "variables"
public class Candidate
//#region "variables"
private string sName;
private string sAddress;
private string sState;
private string sCity;
private string sFName;
private float fWeight;
private float fHight;
private string sQualification;
private string sAssoclubName;
private string sSeniorName;
private string sNoc;
private string sComments;
private DateTime dtDob;
private int iAddedBYId;
public Candidate()
public string Name
get return sName;
set sName = value;
public string Address
get return sAddress;
set sAddress = value;
public string State
get return sState;
set sState = value;
public string City
get return sCity;
set sCity = value;
public string FName
get return sFName;
set sFName = value;
public float Weight
get return fWeight;
set fWeight = value;
public float Height
get return fHight;
set fHight = value;
public string Qualification
get return sQualification;
set sQualification = value;
public string AssoclubName
get return sAssoclubName;
set sAssoclubName = value;
public string SeniorName
get return sSeniorName;
set sSeniorName = value;
public string IsNoc
get return sNoc;
set sNoc = value;
public string Comments
get return sComments;
set sComments = value;
public DateTime Dob
get return dtDob;
set dtDob = value;
public int AddedBYId
get return iAddedBYId;
set iAddedBYId = value;
#region "Function"
public int InsertCandidate()
SqlParameter[] oParam =
new SqlParameter("@prm_name",sName),
new SqlParameter("@prm_dob",dtDob),
new SqlParameter("@prm_fname",sFName),
new SqlParameter("@prm_state",sState),
new SqlParameter("@prm_city",sCity),
new SqlParameter("@prm_address",sAddress),
new SqlParameter("@prm_weight",fWeight),
new SqlParameter("@prm_height",fHight),
new SqlParameter("@prm_qualification",sQualification),
new SqlParameter("@prm_associateclubname",sAssoclubName),
new SqlParameter("@prm_seniorname",sSeniorName),
new SqlParameter("@prm_noc ",sNoc),
new SqlParameter(" @prm_comments",sComments),
new SqlParameter("@prm_addedbyid",iAddedBYId)
;
int iSuccessful = DataManager.ExecuteNonQuery("p_cand_insert", oParam);
#endregion
#endregion
`
【问题讨论】：
我猜错误在这一行：nt iSuccessful = DataManager.....。错误消息告诉您问题所在 - 您正尝试访问 DataManager 类的实例方法，就好像它是 static。创建类的实例，然后调用方法：DataMangaer dm = new DataManager(); int iSuccessful = dm.ExeucteNonQuery(....
【参考方案1】：
假设给出错误的行是这样的：
int iSuccessful = DataManager.ExecuteNonQuery("p_cand_insert", oParam);
您看到此错误的原因是因为 ExecuteNonQuery 是一个 instance 方法 - 这意味着您需要一个 DataManager 的实例来调用该方法。
你可以这样做：
DataManager dm = new DataManager();
int iSuccessful = dm.ExecuteNonQuery("p_cand_insert", oParam);
或者，您可以将方法标记为static：
public static object ExecuteNonQuery(string sSQLText, SqlParameter [] oParam)
然后这样称呼它：
int iSuccessful = DataManager.ExecuteNonQuery("p_can_insert", oParam);
但是，请注意您的方法返回一个object，而您正试图将其分配给int。我会更改方法以返回int（您现在拥有它的方式可能会引发错误）：
public int ExecuteNonQuery(string sSQLText, SqlParameter [] oParam)
SqlConnection oCn = OpenConnection();
SqlCommand cmd = new SqlCommand();//sSQLText, oCn);
cmd.Connection = oCn;
cmd.CommandText = sSQLText;
if (oParam != null && oParam.Length > 0)
foreach (SqlParameter oOneParameter in oParam)
cmd.Parameters.Add(oOneParameter);
int retVal = cmd.ExecuteNonQuery();
CloseConnection(oCn);
return retVal;
SqlCommand.ExecuteNonQuery 返回一个整数，其中包含受影响的行数；没有理由让它成为一个对象（至少我能想到）。
【讨论】：
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