下面是调用存储过程 是返回一个自动生成的订单编号 请高手告诉我哪里出错了
public static string SelectId()
{
string sql = "did";
SqlParameter para = new SqlParameter("@did", SqlDbType.NVarChar);
para.Direction = ParameterDirection.Output;
DataTable dt=DBHelper.GetDataSet(sql, para);//这里是返回DataTable
return para.ParameterName["@did"].ToString();//这个不知道怎么取返回的编号 自己乱写的
}异常详细信息: System.InvalidOperationException: String[0]: Size 属性具有无效大小值 0。源错误:
行 93: cmd.Parameters.AddRange(values);
行 94: SqlDataAdapter da = new SqlDataAdapter(cmd);
行 95: da.Fill(ds);
行 96: return ds.Tables[0];
行 97: }
public static string SelectId()
{
string sql = "did";
SqlParameter para = new SqlParameter("@did", SqlDbType.NVarChar);
para.Direction = ParameterDirection.Output;
DataTable dt=DBHelper.GetDataSet(sql, para);//这里是返回DataTable
return para.ParameterName["@did"].ToString();//这个不知道怎么取返回的编号 自己乱写的
}异常详细信息: System.InvalidOperationException: String[0]: Size 属性具有无效大小值 0。源错误:
行 93: cmd.Parameters.AddRange(values);
行 94: SqlDataAdapter da = new SqlDataAdapter(cmd);
行 95: da.Fill(ds);
行 96: return ds.Tables[0];
行 97: }
public static int ExecuteCommand(string safeSql)
{
SqlCommand cmd = new SqlCommand(safeSql, Connection);
int result = cmd.ExecuteNonQuery();
return result;
}
public static int ExecuteCommand(string sql, params SqlParameter[] values)
{
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
return cmd.ExecuteNonQuery();
} public static int GetScalar(string safeSql)
{
SqlCommand cmd = new SqlCommand(safeSql, Connection);
int result = Convert.ToInt32(cmd.ExecuteScalar());
return result;
} public static int GetScalar(string sql, params SqlParameter[] values)
{
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
int result = Convert.ToInt32(cmd.ExecuteScalar());
return result;
} public static SqlDataReader GetReader(string safeSql)
{
SqlCommand comd = new SqlCommand(safeSql, Connection);
SqlDataReader reader = comd.ExecuteReader();
reader.Close();
return reader;
} public static SqlDataReader GetReader(string sql, params SqlParameter[] values)
{
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
SqlDataReader reader = cmd.ExecuteReader();
return reader;
} public static DataTable GetDataSet(string safeSql)
{
DataSet ds = new DataSet();
SqlCommand cmd = new SqlCommand(safeSql, Connection);
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(ds);
return ds.Tables[0];
} public static DataTable GetDataSet(string sql, params SqlParameter[] values)
{
DataSet ds = new DataSet();
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(ds);
return ds.Tables[0];
}
要改为CommandType.StoredProcedure