“System.Data.dll”类型的异常
各位高手赐教,异常提示：在System.Data.SqlClient.SqlException中第一次偶然出现的“System.Data.dll”类型的异常--------------------编程问答-------------------- 代码呢？ --------------------编程问答-------------------- using System;
using System.Data;
using System.Configuration;
using System.Collections.Generic;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class AssetsAdd : System.Web.UI.Page
{
//模板
Model.Assets MA = new Model.Assets();
//业务
BLL.Assets BA = new BLL.Assets();
protected void Page_Load(object sender, EventArgs e)
{
LoginLogic.MatchLoad("../", "Assets");
if (!IsPostBack)
{
MyDataBind();
}
}
protected void Button1_Click(object sender, EventArgs e)
{
try
{
if (String.IsNullOrEmpty(KeyValue_ZCMC.Text.Trim()))
{
throw new Exception("名称不能为空！");
}
MA.ZCMC = KeyValue_ZCMC.Text;
BA.Add(MA);
MessageBox.Show("添加信息成功");
KeyValue_ZCMC.Text = "";
}
catch (Exception exp)
{
MessageBox.Show(exp.Message);
}
}
} --------------------编程问答--------------------
没有数据库操作的代码？
这个错误可能因为数据库相应的操作吧... --------------------编程问答-------------------- 修复一下VS。。。。或者重新下载一个System.Data.dll
--------------------编程问答-------------------- 代码现贴上来，请高手看看。
using System;
using System.Data;
using System.Data.Common;
using System.Text;
using MySql.Data.MySqlClient;
using System.Data.OracleClient;
using System.Data.OleDb;
using System.Data.SqlClient;
namespace DBUtility
{
/// <summary>
/// 数据库操作
/// </summary>
public class DBHelper
{
/// <summary>
/// 枚举：数据库类型
/// </summary>
public enum DatabaseTypes
{
Sql, MySql, Oracle, OleDb
}
private DatabaseTypes _databaseType;
private string _connectionString;
private IDBHelper _iDBHelper;
public DBHelper()
{ }
public DBHelper(DatabaseTypes databaseType, string connectionString)
{
DatabaseType = databaseType;
this._connectionString = connectionString;
}
/// <summary>
/// 数据库类型
/// </summary>
public DatabaseTypes DatabaseType
{
get
{
return _databaseType;
}
set
{
_databaseType = value;
switch (value)
{
case DatabaseTypes.OleDb:
_iDBHelper = new OleDbHelper();
break;
case DatabaseTypes.MySql:
_iDBHelper = new MySqlHelper();
break;
case DatabaseTypes.Oracle:
_iDBHelper = new OracleHelper();
break;
case DatabaseTypes.Sql:
default:
_iDBHelper = new SqlHelper();
break;
}
}
}
/// <summary>
/// 数据库连接字符串
/// </summary>
public string ConnectionString
{
get { return _connectionString; }
set { _connectionString = value; }
}
/// <summary>
/// 创建数据库连接
/// </summary>
public DbConnection CreateConnection()
{
switch (_databaseType)
{
case DatabaseTypes.MySql:
return new MySqlConnection(_connectionString);
case DatabaseTypes.Oracle:
return new OracleConnection(_connectionString);
case DatabaseTypes.OleDb:
return new OleDbConnection(_connectionString);
case DatabaseTypes.Sql:
default:
return new SqlConnection(_connectionString);
}
}
#region === 创造DbParameter的实例 ===
/// <summary>
/// 创造输入DbParameter的实例
/// </summary>
public DbParameter CreateInDbParameter(string paraName, DbType dbType, int size, object value)
{
return CreateDbParameter(paraName, dbType, size, value, ParameterDirection.Input);
}
/// <summary>
/// 创造输入DbParameter的实例
/// </summary>
public DbParameter CreateInDbParameter(string paraName, DbType dbType, object value)
{
return CreateDbParameter(paraName, dbType, 0, value, ParameterDirection.Input);
}
/// <summary>
/// 创造输出DbParameter的实例
/// </summary>
public DbParameter CreateOutDbParameter(string paraName, DbType dbType, int size)
{
return CreateDbParameter(paraName, dbType, size, null, ParameterDirection.Output);
}
/// <summary>
/// 创造输出DbParameter的实例
/// </summary>
public DbParameter CreateOutDbParameter(string paraName, DbType dbType)
{
return CreateDbParameter(paraName, dbType, 0, null, ParameterDirection.Output);
}
/// <summary>
/// 创造返回DbParameter的实例
/// </summary>
public DbParameter CreateReturnDbParameter(string paraName, DbType dbType, int size)
{
return CreateDbParameter(paraName, dbType, size, null, ParameterDirection.ReturnValue);
}
/// <summary>
/// 创造返回DbParameter的实例
/// </summary>
public DbParameter CreateReturnDbParameter(string paraName, DbType dbType)
{
return CreateDbParameter(paraName, dbType, 0, null, ParameterDirection.ReturnValue);
}
/// <summary>
/// 创造DbParameter的实例
/// </summary>
public DbParameter CreateDbParameter(string paraName, DbType dbType, int size, object value, ParameterDirection direction)
{
DbParameter para;
switch (_databaseType)
{
case DatabaseTypes.MySql:
para = new MySqlParameter();
break;
case DatabaseTypes.Oracle:
para = new OracleParameter();
break;
case DatabaseTypes.OleDb:
para = new OleDbParameter();
break;
case DatabaseTypes.Sql:
default:
para = new SqlParameter();
break;
}
para.ParameterName = paraName;
if (size != 0)
para.Size = size;
para.DbType = dbType;
if (value != null)
para.Value = value;
para.Direction = direction;
return para;
}
#endregion
#region === 数据库执行方法 ===
/// <summary>
/// 执行 Transact-SQL 语句并返回受影响的行数。
/// </summary>
public int ExecuteNonQuery(CommandType cmdType, string cmdText, params DbParameter[] cmdParms)
{
return _iDBHelper.ExecuteNonQuery(_connectionString, cmdType, cmdText, cmdParms);
}
/// <summary>
/// 在事务中执行 Transact-SQL 语句并返回受影响的行数。
/// </summary>
public int ExecuteNonQuery(DbTransaction trans, CommandType cmdType, string cmdText, params DbParameter[] cmdParms)
{
return _iDBHelper.ExecuteNonQuery(trans, cmdType, cmdText, cmdParms);
}
/// <summary>
/// 在事务中执行查询，返回DataSet
/// </summary>
public DataSet ExecuteQuery(DbTransaction trans, CommandType cmdType, string cmdText, params DbParameter[] cmdParms)
{
return _iDBHelper.ExecuteQuery(trans, cmdType, cmdText, cmdParms);
}
/// <summary>
/// 执行查询，返回DataSet
/// </summary>
public DataSet ExecuteQuery(CommandType cmdType, string cmdText, params DbParameter[] cmdParms)
{
return _iDBHelper.ExecuteQuery(_connectionString, cmdType, cmdText, cmdParms);
}
/// <summary>
/// 在事务中执行查询，返回DataReader
/// </summary>
public DbDataReader ExecuteReader(DbTransaction trans, CommandType cmdType, string cmdText, params DbParameter[] cmdParms)
{
return _iDBHelper.ExecuteReader(trans, cmdType, cmdText, cmdParms);
}
/// <summary>
/// 执行查询，返回DataReader
/// </summary>
public DbDataReader ExecuteReader(CommandType cmdType, string cmdText, params DbParameter[] cmdParms)
{
return _iDBHelper.ExecuteReader(_connectionString, cmdType, cmdText, cmdParms);
}
/// <summary>
/// 在事务中执行查询，并返回查询所返回的结果集中第一行的第一列。忽略其他列或行。
/// </summary>
public object ExecuteScalar(DbTransaction trans, CommandType cmdType, string cmdText, params DbParameter[] cmdParms)
{
return _iDBHelper.ExecuteScalar(trans, cmdType, cmdText, cmdParms);
}
/// <summary>
/// 执行查询，并返回查询所返回的结果集中第一行的第一列。忽略其他列或行。
/// </summary>
public object ExecuteScalar(CommandType cmdType, string cmdText, params DbParameter[] cmdParms)
{
return _iDBHelper.ExecuteScalar(_connectionString, cmdType, cmdText, cmdParms);
}
/// <summary>
/// 分页获取数据
/// </summary>
/// <param name="connectionString">连接字符串</param>
/// <param name="tblName">表名</param>
/// <param name="fldName">字段名</param>
/// <param name="pageSize">页大小</param>
/// <param name="pageIndex">第几页</param>
/// <param name="fldSort">排序字段</param>
/// <param name="fldDir">升序{False}/降序(True)</param>
/// <param name="condition">条件(不需要where)</param>
--------------------编程问答--------------------
public DbDataReader GetPageList(string tblName, int pageSize, int pageIndex, string fldSort, bool fldDir, string condition)
{
return _iDBHelper.GetPageList(_connectionString, tblName, pageSize, pageIndex, fldSort, fldDir, condition);
}
/// <summary>
/// 得到数据条数
/// </summary>
/// <param name="tblName">表名</param>
/// <param name="condition">条件(不需要where)</param>
/// <returns>数据条数</returns>
public int GetCount(string tblName, string condition)
{
return _iDBHelper.GetCount(_connectionString, tblName, condition);
}
#endregion
#region === 由Object取值 ===
/// <summary>
/// 取得Int16值
/// </summary>
public Int16 GetInt16(object obj)
{
if (obj != DBNull.Value)
{
return Convert.ToInt16(obj);
}
else
{
return 0;
}
}
/// <summary>
/// 取得UInt16值
/// </summary>
public UInt16 GetUInt16(object obj)
{
if (obj != DBNull.Value)
{
return Convert.ToUInt16(obj);
}
else
{
return 0;
}
}
/// <summary>
/// 取得Int值
/// </summary>
public int GetInt(object obj)
{
if (obj != DBNull.Value)
{
return Convert.ToInt32(obj);
}
else
{
return 0;
}
}
/// <summary>
/// 取得UInt值
/// </summary>
public uint GetUInt(object obj)
{
if (obj != DBNull.Value)
{
return Convert.ToUInt32(obj);
}
else
{
return 0;
}
}
/// <summary>
/// 取得UInt64值
/// </summary>
public ulong GetULong(object obj)
{
if (obj != DBNull.Value)
{
return Convert.ToUInt64(obj);
}
else
{
return 0;
}
}
/// <summary>
/// 取得byte值
/// </summary>
public Byte GetByte(object obj)
{
if (obj != DBNull.Value)
{
return Convert.ToByte(obj);
}
else
{
return 0;
}
}
/// <summary>
/// 取得sbyte值
/// </summary>
public sbyte GetSByte(object obj)
{
if (obj != DBNull.Value)
{
return Convert.ToSByte(obj);
}
else
{
return 0;
}
}
/// <summary>
/// 获得Long值
/// </summary>
public long GetLong(object obj)
{
if (obj != DBNull.Value)
{
return Convert.ToInt64(obj);
}
else
{
return 0;
}
}
/// <summary>
/// 取得Decimal值
/// </summary>
public decimal GetDecimal(object obj)
{
if (obj != DBNull.Value)
{
return Convert.ToDecimal(obj);
}
else
{
return 0;
}
}
/// <summary>
/// 取得float值
/// </summary>
public float GetFloat(object obj)
{
if (obj != DBNull.Value)
{
return Convert.ToSingle(obj);
}
else
{
return 0;
}
}
/// <summary>
/// 取得double值
/// </summary>
public double GetDouble(object obj)
{
if (obj != DBNull.Value)
{
return Convert.ToDouble(obj);
}
else
{
return 0;
}
}
/// <summary>
/// 取得Guid值
/// </summary>
public Guid GetGuid(object obj)
{
if (obj != DBNull.Value)
{
return new Guid(obj.ToString());
}
else
{
return Guid.Empty;
}
}
/// <summary>
/// 取得DateTime值
/// </summary>
public DateTime GetDateTime(object obj)
{
if (obj != DBNull.Value)
{
DateTime tmp;
if (DateTime.TryParse(obj.ToString(), out tmp))
{
return tmp;
}
else
{
return DateTime.MinValue;
}
}
else
{
return DateTime.MinValue;
}
}
/// <summary>
/// 取得bool值
/// </summary>
public bool GetBool(object obj)
{
if (obj != DBNull.Value)
{
return Convert.ToBoolean(obj);
}
else
{
return false;
}
}
/// <summary>
/// 取得byte[]
/// </summary>
public Byte[] GetBinary(object obj)
{
if (obj != DBNull.Value)
{
return (Byte[])obj;
}
else
{
return null;
}
}
/// <summary>
/// 取得string值
/// </summary>
public string GetString(object obj)
{
return obj.ToString();
}
#endregion
}
} --------------------编程问答-------------------- 看错了。。。。这个错应该是数据库操作的问题。。。
把你数据操作代码帖出来看看
或者自己用try。。catch调试一下。。 --------------------编程问答-------------------- 哪行错误
连接字符串，SQL语句
--------------------编程问答-------------------- 代码贴出来了，帮我看看 --------------------编程问答--------------------
我也想知道，报错是哪行，这么多行代码，看了一遍也没看出来。。。
补充：.NET技术 , C#
