找一个适合自己的数据库操作类 刚开始不理解sqlparameter[] 这个参数是干什么的 怎么传

using System.Data.SqlClient;
using System.Data;
using System;
using System.Configuration;
using System.Collections.Generic;
namespace DBUtility
{
    public class sqlheper
    {
        public SqlConnection con;
        public sqlheper()
        {
            con = new SqlConnection(ConfigurationManager.AppSettings["SQLConnString"].ToString());
        }
        public sqlheper (String ConnectionString)
        {
            con = new SqlConnection(ConnectionString);
        }

        /// <summary>
        /// Execute SqlCommand
        /// </summary>
        /// <param name="proc_name"></param>
        /// <param name="param"></param>
        public void ExecuteSqlCommand(string proc_name, SqlParameter[] param)
        {
            con.Open();
            SqlTransaction tran = con.BeginTransaction();
            SqlCommand cmd = new SqlCommand(proc_name, con);
            cmd.Transaction = tran;
            cmd.CommandType = CommandType.StoredProcedure;

            if (param != null)
            {
                foreach (SqlParameter parameter in param)
                {
                    ReplaceParameters(parameter);
                    cmd.Parameters.Add(parameter);
                }
            }
            try
            {
                cmd.ExecuteNonQuery();
                tran.Commit();
            }
            catch (Exception ex)
            {
                tran.Rollback();
                throw (ex);
            }
            finally
            {
                con.Close();
            }
        }

        /// <summary>
        /// Execute SqlCommand
        /// </summary>
        /// <param name="proc_name"></param>
        public void ExecuteSqlCommand(string proc_name)
        {
            con.Open();
            SqlTransaction tran = con.BeginTransaction();
            SqlCommand cmd = new SqlCommand(proc_name, con);
            cmd.Transaction = tran;
            cmd.CommandType = CommandType.StoredProcedure;
            try
            {
                cmd.ExecuteNonQuery();
                tran.Commit();
            }
            catch (Exception ex)
            {
                tran.Rollback();
                throw (ex);
            }
            finally
            {
                con.Close();
            }
        }

        /// <summary>
        /// Return DataTable
        /// </summary>
        /// <param name="proc_name"></param>
        /// <param name="param"></param>
        /// <returns></returns>
        public DataTable ExecuteDataTable(string proc_name, SqlParameter[] param)
        {
            DataTable dt = new DataTable();
            con.Open();
            SqlTransaction tran = con.BeginTransaction();
            SqlDataAdapter sda = new SqlDataAdapter(proc_name, con);
            sda.SelectCommand.CommandType = CommandType.StoredProcedure;
            sda.SelectCommand.Transaction = tran;
            if (param != null)
            {
                foreach (SqlParameter parameter in param)
                {
                    ReplaceParameters(parameter);
                    sda.SelectCommand.Parameters.Add(parameter);
                }
            }
            try
            {
                sda.Fill(dt);
                tran.Commit();
            }
            catch (Exception ex)
            {
                tran.Rollback();
                throw (ex);
            }
            finally
            {
                con.Close();
            }
            return dt;
        }

        /// <summary>
        /// Return DataTable
        /// </summary>
        /// <param name="proc_name"></param>
        /// <returns></returns>
        public DataTable ExecuteDataTable(string proc_name)
        {
            DataTable dt = new DataTable();
            con.Open();
            SqlTransaction tran = con.BeginTransaction();
            SqlDataAdapter sda = new SqlDataAdapter(proc_name, con);
            sda.SelectCommand.CommandType = CommandType.StoredProcedure;
            sda.SelectCommand.Transaction = tran;
            try
            {
                sda.Fill(dt);
                tran.Commit();
            }
            catch (Exception ex)
            {
                tran.Rollback();
                throw (ex);
            }
            finally
            {
                con.Close();
            }
            return dt;
        }

        /// <summary>
        /// Return DataSet
        /// </summary>
        /// <param name="proc_name"></param>
        /// <returns></returns>
        public DataSet ExecuteDataSet(string proc_name)
        {
            DataSet ds = new DataSet();
            con.Open();
            SqlTransaction tran = con.BeginTransaction();
            SqlDataAdapter sda = new SqlDataAdapter(proc_name, con);
            //sda.SelectCommand.CommandType = CommandType.StoredProcedure;
            sda.SelectCommand.Transaction = tran;
            try
            {
                sda.Fill(ds);
                tran.Commit();
            }
            catch (Exception ex)
            {
                tran.Rollback();
                throw (ex);
            }
            finally
            {
                con.Close();
            }
            return ds;
        }

        /// <summary>
        /// Return DataSet
        /// </summary>
        /// <param name="proc_name"></param>
        /// <param name="param"></param>
        /// <returns></returns>
        public DataSet ExecuteDataSet(string proc_name, SqlParameter[] param)
        {
            DataSet ds = new DataSet();
            con.Open();
            SqlTransaction tran = con.BeginTransaction();
            SqlDataAdapter sda = new SqlDataAdapter(proc_name, con);
            sda.SelectCommand.CommandType = CommandType.StoredProcedure;
            sda.SelectCommand.Transaction = tran;
            if (param != null)
            {
                foreach (SqlParameter parameter in param)
                {
                    ReplaceParameters(parameter);
                    sda.SelectCommand.Parameters.Add(parameter);
                }
            }
            try
            {
                sda.Fill(ds);
                tran.Commit();
            }
            catch (Exception ex)
            {
                tran.Rollback();
                throw (ex);
            }
            finally
            {
                con.Close();
            }
            return ds;
        }

        /// <summary>
        /// Return DataReader
        /// </summary>
        /// <param name="proc_name"></param>
        /// <param name="param"></param>
        /// <returns></returns>
        public SqlDataReader ExecuteReader(string proc_name, SqlParameter[] param)
        {
            con.Open();
            SqlTransaction tran = con.BeginTransaction();
            SqlCommand cmd = new SqlCommand(proc_name, con);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Transaction = tran;
            if (param != null)
            {
                foreach (SqlParameter parameter in param)
                {
                    ReplaceParameters(parameter);
                    cmd.Parameters.Add(parameter);
                }
            }
            SqlDataReader sdr;
            try
            {
                sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
            }
            catch (Exception ex)
            {
                throw (ex);
            }
            finally
            {
            }
            return sdr;
        }




        /// <summary>
        /// Return DataTable
        /// </summary>
        /// <param name="SqlStr"></param>
        /// <param name="param"></param>
        /// <returns></returns>
        public DataTable ExecuteDataTableSql(string SqlStr, SqlParameter[] param)
        {
            DataTable dt = new DataTable();
            con.Open();
            SqlTransaction tran = con.BeginTransaction();
            SqlDataAdapter sda = new SqlDataAdapter(SqlStr, con);
            sda.SelectCommand.CommandType = CommandType.Text;
            sda.SelectCommand.Transaction = tran;
            if (param != null)
            {
                foreach (SqlParameter parameter in param)
                {
                    ReplaceParameters(parameter);
                    sda.SelectCommand.Parameters.Add(parameter);
                }
            }
            try
            {
                sda.Fill(dt);
                tran.Commit();
            }
            catch (Exception ex)
            {
                tran.Rollback();
                throw (ex);
            }
            finally
            {
                con.Close();
            }
            return dt;
        }
        /// <summary>
        /// Execute SqlCommand
        /// </summary>
        /// <param name="SqlStr"></param>
        /// <param name="param"></param>
        public void ExecuteSqlCommandSql(string SqlStr, SqlParameter[] param)
        {
            con.Open();
            SqlTransaction tran = con.BeginTransaction();
            SqlCommand cmd = new SqlCommand(SqlStr, con);
            cmd.Transaction = tran;
            cmd.CommandType = CommandType.Text;

            if (param != null)
            {
                foreach (SqlParameter parameter in param)
                {
                    ReplaceParameters(parameter);
                    cmd.Parameters.Add(parameter);
                }
            }
            try
            {
                cmd.ExecuteNonQuery();
                tran.Commit();
            }
            catch (Exception ex)
            {
                tran.Rollback();
                throw (ex);
            }
            finally
            {
                con.Close();
            }
        }
        /// <summary>
        /// Return DataReader
        /// </summary>
        /// <param name="SqlStr"></param>
        /// <param name="param"></param>
        /// <returns></returns>
        public SqlDataReader ExecuteReaderSql(string SqlStr, SqlParameter[] param)
        {
            con.Open();
            SqlTransaction tran = con.BeginTransaction();
            SqlCommand cmd = new SqlCommand(SqlStr, con);
            cmd.CommandType = CommandType.Text;
            cmd.Transaction = tran;
            if (param != null)
            {
                foreach (SqlParameter parameter in param)
                {
                    ReplaceParameters(parameter);
                    cmd.Parameters.Add(parameter);
                }
            }
            SqlDataReader sdr;
            try
            {
                sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
            }
            catch (Exception ex)
            {
                throw (ex);
            }
            finally
            {
            }
            return sdr;
        }


        /// <summary>
        /// Return DataSet
        /// </summary>
        /// <param name="proc_name"></param>
        /// <param name="param"></param>
        /// <returns></returns>
        public DataSet ExecuteDataSetSql(string SqlStr, SqlParameter[] param)
        {
            DataSet ds = new DataSet();
            con.Open();
            SqlTransaction tran = con.BeginTransaction();
            SqlDataAdapter sda = new SqlDataAdapter(SqlStr, con);
            sda.SelectCommand.CommandType = CommandType.Text;
            sda.SelectCommand.Transaction = tran;
            if (param != null)
            {
                foreach (SqlParameter parameter in param)
                {
                    ReplaceParameters(parameter);
                    sda.SelectCommand.Parameters.Add(parameter);
                }
            }
            try
            {
                sda.Fill(ds);
                tran.Commit();
            }
            catch (Exception ex)
            {
                tran.Rollback();
                throw (ex);
            }
            finally
            {
                con.Close();
            }
            return ds;
        }

        /// <summary>
        /// Replace Parameters
        /// </summary>
        /// <param name="SingleParameter"></param>
        /// <returns></returns>
        private SqlParameter ReplaceParameters(SqlParameter SingleParameter)
        {
            if (SingleParameter.Value is String)
            {
                SingleParameter.Value.ToString().Replace(@"\", @"\\");
                SingleParameter.Value.ToString().Replace("'", "\"");
                
            }
            return SingleParameter;
        }
        /// <summary>
        /// 事物处理
        /// </summary>
        /// <param name="listsql">sql数组</param>
        /// <returns></returns>
        public  int ExuceteSqlTransaction(List<string> listsql)
        {
            int cnt = 0;
            SqlCommand cmd = new SqlCommand();
            SqlConnection conn = new SqlConnection();
           string ConnectionStringLocalTransaction = ConfigurationManager.AppSettings["SQLConnString"].ToString();
           conn.ConnectionString = ConnectionStringLocalTransaction;
            try
            {
                for (int i = 0; i < listsql.Count; i++)
                {

                    cmd.CommandText += listsql[i].ToString();
                }
                cmd.Connection = conn;
                conn.Open();

                //开始事务
                cmd.Transaction = conn.BeginTransaction();
                cnt = cmd.ExecuteNonQuery();

                cmd.Transaction.Commit();
            }
            catch
            {
                //回滚事务
                cmd.Transaction.Rollback();
                throw;
            }
            finally
            {
                conn.Close();
                cmd.Dispose();
            }
            return cnt;

        }
    }
}

sqlparameter[] 这东西 是防止sql注入的 也就是说 sql后面 加的条件语句中所满足的条件 在显示的时候是个隐藏的变量 而不会出现值下面对这个方法进行引用 注意上述方法是调用存储过程 如果 想直接sql语句 可以注释掉方法中的sda.SelectCommand.CommandType = CommandType.Text;部分下面写一下调用过程的例子

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        bind();
    }
    public void bind()
    { 
    sqlheper sql =new sqlheper();
        string str ="select * from thesis where qkid=@qkid";
        SqlParameter[] sqlpa=new SqlParameter[]{new SqlParameter("@qkid", SqlDbType.Int)};
        sqlpa[0].Value= "1";

         DataSet myds=sql.ExecuteDataSet(str, sqlpa);
         Gridview1.DataSource = myds;
         Gridview1.DataBind();

      

    
    }
}

这样显示sql语句的时候条件的值 就不是1

而是变量@qkid