连接的当前状态是打开的。在c#win app中 [英] The connection's current state is open. in c# win app

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问题描述

public bool existPationts()

{

con.Open();

s =select * from Patients where P_id =+

Convert.ToString(txt_Pid.Text);

sCommand = new SqlCommand(s,con);

int isexist;

isexist = Convert.ToInt32(sCommand.ExecuteScalar());

if(isexist> 0)

{

MessageBox .Show(它存​​在);

txt_Pid.Focus();

txt_Pid.Clear();

返回true;



con.Close();

}

else

{

返回false;

con.Close();

}



private void btn_Save_Click (对象发送者,EventArgs e)

{

试试

{

if(!existPationts())

{

验证();

if(validateID == true&& validateName == true&& validatePhone1

== true&& validateRadio == true&& validateCB_City == true

&& validateCB_Center == true&& validateCB_doctor ==

true&& validateCB_Side == true)

{



if(MessageBox.Show(你要保存吗?,保存,MessageBoxButtons。 YesNo,MessageBoxIcon.Question)== DialogResult.Yes)

{



s =插入患者(P_id,P_Name,P_Gender,

P_DateOfBirth,City_id,Center_id,Phone1,Phone2,

Doctor_id,Side_id,P_Weight,P_Length,Notes);

s = s +值(@P_id,@ P_Name,@ P_Gender,

@P_DateOfBirth,@ City_id,@ Center_id,@ Phone1,@ Phone2,

@Doctor_id,@ Side_id,@ P_Weight, @P_Length,@注意);

sCommand =新的SqlCommand(s,con);

con.Open();

sCommand.Parameters.AddWithValue(@ P_id,txt_Pid.Text);

sCommand.Parameters.AddWithValue(@ P_Name,

txt_PName.Text);

sCommand.Parameters.AddWithValue(@ P_Gender,x);

sCommand.Parameters.AddWithValue(@ P_DateOfBirth,

dtp_PBirthDate.Text ); $ / b $ $ $ $ s $ s $ $ $ $ $ $ $ $ $ $ $ Center_id,

CB_Center.SelectedValue);

sCommand.Parameters.AddWithValue(@ Phone1,

txt_Phone1.Text);

sCommand.Parameters.AddWithValue(@ Phone2,

txt_Phone2.Text);

sCommand.Parameters.AddWithValue(@ Doctor_id,

CB_Doctor.SelectedValue);

sCommand.Parameters.AddWithValue (@ Side_id,

CB_Side.SelectedValue);

sCommand.Parameters.AddWithValue(@ P_Weight,

txt_Weight.Text) ; $ / b $ s $ b $ com $。 ,

txt_Notes.Text);

sCommand.ExecuteNonQuery();

con.Close();



MessageBox.Show(它已保存,MessageBoxButtons.OK,MessageBoxIco n。信息);

}

其他

{

MessageBox.Show(取消); < br $>
}

}

}



}

catch

{

return;

}



}



我尝试了什么:



如何在此代码中解决此问题

public bool existPationts()
{
con.Open();
s = "select * from Patients where P_id = " +
Convert.ToString(txt_Pid.Text);
sCommand = new SqlCommand(s, con);
int isexist;
isexist = Convert.ToInt32(sCommand.ExecuteScalar());
if(isexist > 0)
{
MessageBox.Show("its exist");
txt_Pid.Focus();
txt_Pid.Clear();
return true;

con.Close();
}
else
{
return false;
con.Close();
}

private void btn_Save_Click(object sender, EventArgs e)
{
try
{
if(!existPationts())
{
Validation();
if (validateID == true && validateName == true && validatePhone1
== true && validateRadio == true && validateCB_City == true
&& validateCB_Center == true && validateCB_doctor ==
true && validateCB_Side == true)
{

if (MessageBox.Show("Are you want save?", "save", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
{

s = "insert into Patients (P_id, P_Name, P_Gender,
P_DateOfBirth, City_id, Center_id, Phone1, Phone2,
Doctor_id, Side_id, P_Weight, P_Length, Notes)";
s = s + "values (@P_id, @P_Name, @P_Gender,
@P_DateOfBirth, @City_id, @Center_id, @Phone1, @Phone2,
@Doctor_id, @Side_id, @P_Weight, @P_Length, @Notes)";
sCommand = new SqlCommand(s, con);
con.Open();
sCommand.Parameters.AddWithValue("@P_id", txt_Pid.Text);
sCommand.Parameters.AddWithValue("@P_Name",
txt_PName.Text);
sCommand.Parameters.AddWithValue("@P_Gender", x);
sCommand.Parameters.AddWithValue("@P_DateOfBirth",
dtp_PBirthDate.Text);
sCommand.Parameters.AddWithValue("@City_id",
CB_City.SelectedValue);
sCommand.Parameters.AddWithValue("@Center_id",
CB_Center.SelectedValue);
sCommand.Parameters.AddWithValue("@Phone1",
txt_Phone1.Text);
sCommand.Parameters.AddWithValue("@Phone2",
txt_Phone2.Text);
sCommand.Parameters.AddWithValue("@Doctor_id",
CB_Doctor.SelectedValue);
sCommand.Parameters.AddWithValue("@Side_id",
CB_Side.SelectedValue);
sCommand.Parameters.AddWithValue("@P_Weight",
txt_Weight.Text);
sCommand.Parameters.AddWithValue("@P_Length",
txt_Length.Text);
sCommand.Parameters.AddWithValue("@Notes",
txt_Notes.Text);
sCommand.ExecuteNonQuery();
con.Close();

MessageBox.Show("it's saved", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else
{
MessageBox.Show("Cancel");
}
}
}

}
catch
{
return;
}

}

What I have tried:

How i solve this problem in this code

推荐答案

你的连接当前状态是开放的。

当你打开连接时,最好在下面做类型

Your Connection Current State is Open.
When you open connection, best practice to do below type
if(con.State == con.Open)
{
lable1.text= "Connection is Open";
}
else
{
lable1.text= "Connection is close";
}





在您的密码中。打开连接时应用条件





In your Code. apply a condition when you open your connection

if(con.State != con.Open)
{
con.Open();
}







问候,

AARIF SHAIKH




Regards,
AARIF SHAIKH


试试这个



public bool existPationts()

{

con .Open();

s =选择来自患者,其中P_id =+

Convert.ToString(txt_Pid.Text);

sCommand = new SqlCommand(s,con);

int isexist;

isexist = Convert.ToInt32(sCommand.ExecuteScalar());

if (isexist> 0)

{

MessageBox.Show(它存​​在);

txt_Pid.Focus();

txt_Pid.Clear();

con.Close();

返回true;





}

其他

{

con.Close();

返回false;



}
Try this

public bool existPationts()
{
con.Open();
s = "select * from Patients where P_id = " +
Convert.ToString(txt_Pid.Text);
sCommand = new SqlCommand(s, con);
int isexist;
isexist = Convert.ToInt32(sCommand.ExecuteScalar());
if(isexist > 0)
{
MessageBox.Show("its exist");
txt_Pid.Focus();
txt_Pid.Clear();
con.Close();
return true;


}
else
{
con.Close();
return false;

}


这篇关于连接的当前状态是打开的。在c#win app中的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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