我收到此错误
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。
我读了this question并且它声明由于没有关闭连接而引起异常。但是，我关闭了代码中的所有连接
这是我的代码，很简单
public partial class index : System.Web.UI.Page
{
private static string defaultReason = "reason not selected";
protected override object SaveViewState()
{
//save view state right after the dynamic controlss added
var viewState = new object[1];
viewState[0] = base.SaveViewState();
return viewState;
}
protected override void LoadViewState(object savedState)
{
//load data frm saved viewstate
if (savedState is object[] && ((object[])savedState).Length == 1)
{
var viewState = (object[])savedState;
fillReasons();
base.LoadViewState(viewState[0]);
}
else
{
base.LoadViewState(savedState);
}
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
string callIDValue = Request.QueryString["CallID"];
string callerIDValue = Request.QueryString["CallerID"];
if (!String.IsNullOrEmpty(callerIDValue))
{
callerID.Value = callerIDValue;
if (!String.IsNullOrEmpty(callIDValue))
{
string query = "INSERT INTO Reason (callerID, callID, reason, timestamp) VALUES (@callerID, @callID, @reason, @timestamp)";
SqlConnection con = getConnection();
SqlCommand command = new SqlCommand(query, con);
command.Parameters.AddWithValue("@callerID", callerIDValue);
command.Parameters.AddWithValue("@callID", callIDValue);
command.Parameters.AddWithValue("@reason", defaultReason);
command.Parameters.AddWithValue("@timestamp", DateTime.Now.ToString());
try
{
con.Open();
command.ExecuteNonQuery();
command.Dispose();
con.Close();
}
catch (Exception ee)
{
command.Dispose();
con.Close();
message.InnerHtml = ee.Message;
}
}
else
{
message.InnerHtml = "Call ID is empty";
}
}
else
{
callerID.Value = "Undefined";
message.InnerHtml = "Caller ID is empty";
}
fillReasons();
}
else
{
}
}
private void fillReasons()
{
string query = "SELECT * FROM wrapuplist WHERE isEnabled = @isEnabled";
SqlConnection con = new SqlConnection(getConnectionString());
SqlCommand cmd = new SqlCommand(query, con);
cmd.Parameters.AddWithValue("isEnabled", true);
con.Open();
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable results = new DataTable();
da.Fill(results);
int numberOfReasons = 0; // a integer variable to know if the number of the reasons becomes able to be divided by four
HtmlGenericControl div = null;
foreach (DataRow row in results.Rows)
{
numberOfReasons++;
if ((numberOfReasons % 4) == 1)
{
div = new HtmlGenericControl("div");
div.Attributes.Add("class", "oneLine");
}
RadioButton radioButton = new RadioButton();
radioButton.ID = "reason_" + row["reasonName"].ToString();
radioButton.GroupName = "reason";
radioButton.Text = row["reasonName"].ToString();
div.Controls.Add(radioButton);
if (numberOfReasons % 4 == 0)
{
myValueDiv.Controls.Add(div);
//numberOfReasons = 0;
}
else if (numberOfReasons == results.Rows.Count)
{
myValueDiv.Controls.Add(div);
//numberOfReasons = 0;
}
}
cmd.Dispose();
da.Dispose();
con.Close();
}
private SqlConnection getConnection()
{
return new SqlConnection(ConfigurationManager.ConnectionStrings["vmpcon"].ConnectionString);
}
private string getConnectionString()
{
return ConfigurationManager.ConnectionStrings["wrapupconnection"].ConnectionString.ToString();
}
protected void buttonSaveClose_Click(object sender, EventArgs e)
{
var divcontrols = myValueDiv.Controls.OfType<HtmlGenericControl>();
bool isFound = false;
RadioButton checkedRadioButton = null;
foreach (HtmlGenericControl loHTML in divcontrols)
{
var checkedRadioButtons = loHTML.Controls.OfType<RadioButton>().Where(radButton => radButton.Checked).ToList();
foreach (RadioButton lobtn in checkedRadioButtons)
{
if (lobtn.Checked)
{
isFound = true;
checkedRadioButton = lobtn;
}
}
}
if (isFound)
{
sReasonError.InnerText = "";
string reason = "";
reason = checkedRadioButton.Text;
string callIDValue = Request.QueryString["CallID"];
string callerIDValue = Request.QueryString["CallerID"];
if (String.IsNullOrEmpty(callIDValue))
{
message.InnerText = "Call ID is empty";
}
else if (String.IsNullOrEmpty(callerIDValue))
{
message.InnerText = "Caller ID is empty";
}
else
{
message.InnerText = "";
string query2 = "SELECT * FROM Reason WHERE callID = @callID AND reason != @reason";
SqlConnection con = getConnection();
SqlCommand command2 = new SqlCommand(query2, con);
command2.Parameters.AddWithValue("@callID", callIDValue);
command2.Parameters.AddWithValue("@reason", defaultReason);
con.Open();
if (command2.ExecuteScalar() != null)
{
message.InnerText = "Already saved";
command2.Dispose();
con.Close();
}
else
{
command2.Dispose();
con.Close();
string notes = taNotes.InnerText;
string query = "UPDATE Reason SET reason = @reason, notes = @notes, timestamp = @timestamp WHERE callID = @callID";
SqlCommand command = new SqlCommand(query, con);
command.Parameters.AddWithValue("@callID", callIDValue);
command.Parameters.AddWithValue("@reason", reason);
command.Parameters.AddWithValue("@notes", notes);
command.Parameters.AddWithValue("@timestamp", DateTime.Now.ToString());
try
{
con.Open();
command.ExecuteNonQuery();
command.Dispose();
con.Close();
message.InnerText = "Done Successfully";
//ClientScript.RegisterStartupScript(typeof(Page), "closePage", "<script type='text/JavaScript'>window.close();</script>");
ClientScript.RegisterStartupScript(typeof(Page), "closePage", "window.open('close.html', '_self', null);", true);
}
catch (Exception ee)
{
command.Dispose();
con.Close();
message.InnerText = "Error, " + ee.Message;
}
}
}
}
else
{
sReasonError.InnerText = "Required";
message.InnerText = "Select a reason";
//fillReasons();
}
}
}
如您所见，所有连接都已关闭，我做错了什么？
答案 0 :(得分：0)
使用try catch时，关闭连接和处理应该在finally块中。
或使用如下所示的使用块
using(SqlConnection con = getConnection())
{
con.Open();
//Do your operation here. The connection will be closed and disposed automatically when the using scope is exited
}