如题,怎么办?
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难道不行吗
2.就是在页面中引用命名空间 using *****
3.你调用的那个方法是不是公共的 public
using System.Data;
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 System.Collections;
using System.Text;
/// <summary>
///User 的摘要说明
/// </summary>
public class User
{
public User()
{
} public void LoadData(string loginName)
{
Database db = new Database();
string sql = "";
sql = "Select * from [User] where LoginName = " + SqlStringFormat.GetQuotedString(loginName);
DataRow dr = db.GetDataRow(sql); if (dr != null)
{
this._userID = GetSafeData.ValidataDataRow_N(dr, "UserID");
this._loginName = GetSafeData.ValidataDataRow_S(dr, "loginName");
this._userName = GetSafeData.ValidataDataRow_S(dr, "UserName");
this._password = GetSafeData.ValidataDataRow_S(dr, "PassWord");
this._address = GetSafeData.ValidataDataRow_S(dr, "Address");
this._homepage = GetSafeData.ValidataDataRow_S(dr, "HomePage");
this._email = GetSafeData.ValidataDataRow_S(dr, "Email");
this._exist = true;
}
else
{
this._exist = false;
}
} public void Add(Hashtable userInfo)
{
Database db = new Database();
db.Insert("[User]", userInfo);
} public static bool HasUser(stirng loginName)
{
Database db = new Database();
string sql = "";
sql = "Select * from [User] where [LoginName] = " + SqlStringFormat.GetQuotedString(loginName);
DataRow row = db.GetDataRow(sql);
if (row != null)
return true;
else
return false;
}
}
using System.Data;
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 System.Collections;
using System.Text;
/// <summary>
///User 的摘要说明
/// </summary>
public class User
{
public User()
{
} public void LoadData(string loginName)
{
Database db = new Database();
string sql = "";
sql = "Select * from [User] where LoginName = " + SqlStringFormat.GetQuotedString(loginName);
DataRow dr = db.GetDataRow(sql); if (dr != null)
{
this._userID = GetSafeData.ValidataDataRow_N(dr, "UserID");
this._loginName = GetSafeData.ValidataDataRow_S(dr, "loginName");
this._userName = GetSafeData.ValidataDataRow_S(dr, "UserName");
this._password = GetSafeData.ValidataDataRow_S(dr, "PassWord");
this._address = GetSafeData.ValidataDataRow_S(dr, "Address");
this._homepage = GetSafeData.ValidataDataRow_S(dr, "HomePage");
this._email = GetSafeData.ValidataDataRow_S(dr, "Email");
this._exist = true;
}
else
{
this._exist = false;
}
} public void Add(Hashtable userInfo)
{
Database db = new Database();
db.Insert("[User]", userInfo);
} public static bool HasUser(stirng loginName) ///就是这个string
{
Database db = new Database();
string sql = "";
sql = "Select * from [User] where [LoginName] = " + SqlStringFormat.GetQuotedString(loginName);
DataRow row = db.GetDataRow(sql);
if (row != null)
return true;
else
return false;
}
}
找不到类型或命名空间名称 string (是否缺少using指令或程序集引用?)
找不到类型或命名空间名称 Dataset (是否缺少using指令或程序集引用?)
找不到类型或命名空间名称 SqlDataReader (是否缺少using指令或程序集引用?)
找不到类型或命名空间名称 Dataset (是否缺少using指令或程序集引用?)
找不到类型或命名空间名称 SqlDataReader (是否缺少using指令或程序集引用?)
using System.Data;
System 、System.Data 、System.Data.SqlClient 分别添加我也认为是系统问题
是类嘛?namespace _name
{
//命名空间都没有
}
public static bool HasUser(stirng loginName) ///就是这个string正确是:
public static bool HasUser(string loginName)
using System.Data;
using System.Web;
using System.Data.SqlClient;
引用下 然后重新生成解决方案!
第一步看看你所引用的类关键字是否正确 如product void
第二步看看你所需要的类是否添加了引用,名称很重要
using System.Data;
using System.Data.SqlClient;
using System.Data;