c# – 达到错误最大池大小？

我想这是因为我没有关闭我的数据库的连接.我在下面为我的Datalayer发布了代码.我需要关闭我的连接吗？我怎么也这样做？这是造成问题的代码吗？

下面是错误代码：

超时已过期.从池中获取连接之前经过的超时时间.这可能是因为所有池连接都在使用中并且达到了最大池大小.

描述：执行当前Web请求期间发生未处理的异常.请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息.

异常详细信息：system.invalidOperationException：超时已过期.从池中获取连接之前经过的超时时间.这可能是因为所有池连接都在使用中并且达到了最大池大小.

public DataTable getPictures()
    {

        //get database connection string from config file
        string strConectionString = ConfigurationManager.AppSettings["DataBaseConnection"];

        //set up sql
        string Strsql = "SELECT MEMBERS.MemberName,Picture.PicLoc,Picture.PicID,Picture.Picrating FROM Picture INNER JOIN MEMBERS ON Picture.MemberID = MEMBERS.MemberID WHERE (Picture.PicID = @n) AND (Picture.PicAproval = 1) AND (Picture.PicArchive = 0)AND (MEMBERS.MemberSex = 'F')";

        DataTable dt = new DataTable();
        using (sqlDataAdapter daObj = new sqlDataAdapter(Strsql,strConectionString))
        {
            daObj.SelectCommand.Parameters.Add("@n",sqlDbType.Int);
            daObj.SelectCommand.Parameters["@n"].Value = GetItemFromArray();

            //fill data table
            daObj.Fill(dt);
        }
        return dt;
    }

public int GetItemFromArray()
    {
        int myRandomPictureID;
        int[] pictureIDs = new int[GetTotalNumberOfAprovedPictureIds()];


        Random r = new Random();
        int MYrandom = r.Next(0,pictureIDs.Length);

        DLPicture GetPictureIds = new DLPicture();
        DataTable DAallAprovedPictureIds = GetPictureIds.GetPictureIdsIntoArray();

        //Assign Location and rating to variables
        int i = 0;
        foreach (DaTarow row in DAallAprovedPictureIds.Rows)
        {

            pictureIDs[i] = (int)row["PicID"];
            i++;
        }

        myRandomPictureID = pictureIDs[MYrandom];
        return myRandomPictureID;
    }

 public DataTable GetPictureIdsIntoArray()
    {
        string strConectionString = ConfigurationManager.AppSettings["DataBaseConnection"];

        //set up sql
        string Strsql = " SELECT Picture.PicID FROM MEMBERS INNER JOIN Picture ON MEMBERS.MemberID = Picture.MemberID WHERE (Picture.PicAproval = 1) AND (Picture.PicArchive = 0) AND (MEMBERS.MemberSex ='F')";
        DataTable dt = new DataTable();
        using (sqlDataAdapter daObj = new sqlDataAdapter(Strsql,strConectionString))
        {

            //fill data table
            daObj.Fill(dt);
        }
        return dt;

    }

解决方法

我相信sqlDataAdapter自己处理连接.但是,在多个背靠背fill()到数据适配器的情况下,在每个fill()请求中打开连接的性能更高.结果是数据库连接被打开和关闭了好几次.

我认为您可以自己控制连接.

using (sqlConnection cnn= new sqlConnection (strConectionString))
using (sqlDataAdapter daObj = new sqlDataAdapter(Strsql,cnn))
    {
        daObj.SelectCommand.Parameters.Add("@n",sqlDbType.Int);
        daObj.SelectCommand.Parameters["@n"].Value = GetItemFromArray();

        cnn.open();

        //fill data table
        daObj.Fill(dt);

        cnn.Close();
    }