C# nt32（dr[“satistutari”].ToString（））； } baglanti.Close（）； baglanti.Dispose（）； 返回Convert.ToString（sonuc）； } 抓住 { 返回“”； } } 私有void Form1\u加载（对象发送方、事件参数e） { 字符串[]kurlar=新字符串[2]； Kurrar[0]=dolarKuru（）； Kurrar[1]=euroKuru（）； dolarLbl.Text=kurlar[0]； euroLbl.Text=库尔勒[1]； Text=veriCek（aylikveri）+“.00tl”； hataLbl.Visible=false； hataLbl1.Visible=false； baglanti=新的SqlConnection（baglantiYazisi）； baglanti.Open（）； SqlCommand kmut=新的SqlCommand（sonMusteri，baglanti）； kmut.ExecuteNonQuery（）； SqlDataReader dr=kmut.ExecuteReader（）； int i=0； while（dr.Read（）&&i！=8） { musTrhArray[i]=dr[“tarih”].ToString（）； MusteriKayıtID[i]=dr[“idmusteri”].ToString（）； musterisehirray[i]=dr[“sehir”].ToString（）； i++； } Close博士（）； baglanti.Dispose（）； baglanti.Close（）； 字符串[]isimler=returnToText（MusteriKayıtID）； isimLbl.Text=isimler[0]； isimLbl1.Text=isimler[1]； isimLbl2.Text=isimler[2]； isimLbl3.Text=isimler[3]； isimLbl4.Text=isimler[4]； isimLbl5.Text=isimler[5]； isimLbl6.Text=isimler[6]； isimLbl7.Text=isimler[7]； musTrh.Text=musTrhArray[0]； musTrh1.Text=musTrhArray[1]； musTrh2.Text=musTrhArray[2]； musTrh3.Text=musTrhArray[3]； musTrh4.Text=musTrhArray[4]； musTrh5.Text=musTrhArray[5]； musTrh6.Text=musTrhArray[6]； musTrh7.Text=musTrhArray[7]； sehirLbl.Text=musterisehirray[0]； sehirLbl1.Text=musterisehirray[1]； sehirLbl2.Text=musterisehirray[2]； sehirLbl3.Text=musterisehirray[3]； sehirLbl4.Text=musterisehirray[4]； sehirLbl5.Text=musterisehirray[5]； sehirLbl6.Text=musterisehirray[6]； sehirLbl7.Text=musterisehirray[7]； baglanti.Open（）； SqlCommand komutu=新的SqlCommand（sonSatis，baglanti）； komutu.ExecuteNonQuery（）； dr=komutu.ExecuteReader（）； int j=0； while（dr.Read（）&&j！=8） { satisArray[j]=dr[“tarih”].ToString（）； satisadetaray[j]=dr[“adet”].ToString（）； satistutarray[j]=dr[“satistutari”].ToString（）； satisMusterIsim[j]=dr[“idmusteri”].ToString（）； j++； } Close博士（）； dr.Dispose（）； satisMusterIsim=returnToText（satisMusterIsim）； saTrh.Text=satisArray[0]； saTrh1.Text=satisArray[1]； saTrh2.Text=satisArray[2]； saTrh3.Text=satisArray[3]； saTrh4.Text=satisArray[4]； saTrh5.Text=satisArray[5]； saTrh6.Text=satisArray[6]； saTrh7.Text=satisArray[7]； tutarLbl.Text=satistudarray[0]； tutarLbl1.Text=satistudarray[1]； tutarLbl2.Text=satistudarray[2]； tutarLbl3.Text=satistudarray[3]； tutarLbl4.Text=satistudarray[4]； tutarLbl5.Text=satistudarray[5]； tutarLbl6.Text=satistudarray[6]； tutarLbl7.Text=satistudarray[7]； adetLbl.Text=satisadetaray[0]； adetLbl1.Text=satisadetaray[1]； adetLbl2.Text=satisadetaray[2]； adetLbl3.Text=satisadetaray[3]； adetLbl4.Text=satisadetaray[4]； adetLbl5.Text=satisadetaray[5]； adetLbl6.Text=satisadetaray[6]； adetLbl7.Text=satisadetaray[7]； satisIsim.Text=satisMusterIsim[0]； satisIsim1.Text=satisMusterIsim[1]； satisIsim2.Text=satisMusterIsim[2]； satisIsim3.Text=satisMusterIsim[3]； satisIsim4.Text=satisMusterIsim[4]； satisIsim5.Text=satisMusterIsim[5]； satisIsim6.Text=satisMusterIsim[6]； satisIsim7.Text=satisMusterIsim[7]； baglanti.Dispose（）； baglanti.Close（）； }

我发布了全部代码。我不知道这是怎么回事。我的所有表单中都有相同的字符串，但出现了此错误

我想出了解决办法。创建新的连接对我帮助很大。因为我正在处理连接<代码>处置（）正在删除所有连接

你能从数据库管理系统执行这个查询吗？是的。我想错误点不是这个查询。debug在整个代码页中都说“baglanti.Open（）；”。baglanti是一个sqlconnection吗..您在哪里设置了相同的connectionstring？是的。如果在Open（）处出现错误，则表示您的connectionstring出现了一些问题。您可以使用connectionstring发布整个代码吗

  public partial class FORMZ : Form
    {
        public static string baglantiYazisi = "Data Source=SERVERADRESS\\; Initial Catalog=Bilal; User id=""; Password="";";
        SqlConnection baglanti = new SqlConnection(baglantiYazisi);
        string[] musTrhArray = new string[8];
        string[] satisArray = new string[8];
        string[] MusteriKayıtID = new string[8];
        string[] MusteriSehirArray = new string[8];

        string[] satisMusterIsim = new string[8];
        string[] satisAdetArray = new string[8];
        string[] satisTutarArray = new string[8];


        string sonMusteri = "SELECT TOP 8 * FROM musteri ORDER BY idmusteri DESC";
        string sonSatis = "SELECT TOP 8 * FROM satis ORDER BY idsatis DESC";
        string haftalikVeri = "SELECT * FROM satis WHERE tarih >= DATEADD(day,-7, GETDATE())";
        string aylikveri = "SELECT * FROM satis WHERE tarih >= DATEADD(day,-30, GETDATE())";

        public musteribilgi musteribilgi;
        public Satis satis;
        public Stok stok;
        public musteri musteri;
        public ERVA()

        {
            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)
        {
            satis = new Satis();
            satis.Show();
            this.Visible = false;

        }

        private void button3_Click(object sender, EventArgs e)
        {
            stok = new Stok();
            stok.Show();
            this.Visible = false;
        }



       string returnIT(string text)
        {

            baglanti.Open();
            string sonuc = "";
            string satis = "select * from musteri where idmusteri = '" + text+ "'";
            SqlCommand yeni = new SqlCommand(satis, baglanti);
            yeni.ExecuteNonQuery();
            SqlDataReader dr = yeni.ExecuteReader();
            while (dr.Read())
            {
                sonuc = dr["isim"].ToString() + " " + dr["soyisim"].ToString();
            }
            dr.Close();
            dr.Dispose();
            baglanti.Dispose();
            baglanti.Close();

            return sonuc;
        }

      string dolarKuru()
        {
            if (CheckForInternetConnection())
            {
                string adres = "http://www.EXAMPLE.com"; //1
                WebRequest istek = HttpWebRequest.Create(adres); //2
                WebResponse cevap; //3
                cevap = istek.GetResponse(); //4
                StreamReader donenBilgiler = new StreamReader(cevap.GetResponseStream()); //5
                string gelen = donenBilgiler.ReadToEnd(); //6
                int titleIndexBaslangici = gelen.IndexOf("http://kur.EXAMPLE.com/kur/abd-dolari") + 177; //7
                int titleIndexBitisi = gelen.Substring(titleIndexBaslangici).IndexOf("1 USD") -58; //8
                string baslik = gelen.Substring(titleIndexBaslangici, titleIndexBitisi);
                dolarLbl.Visible = true;
                euroLbl.Visible = true;

                hataLbl.Visible = false;
                hataLbl1.Visible = false;
                return baslik;

            }
            else
            {
                dolarLbl.Visible = false;
                euroLbl.Visible = false;

                hataLbl.Visible = true;
                hataLbl1.Visible = true;



            }

            return " ";
        }

        public static bool CheckForInternetConnection()
        {
            try
            {
                using (var client = new WebClient())
                using (var stream = client.OpenRead("http://www.google.com"))
                {
                    return true;
                }
            }
            catch
            {
                return false;
            }
        }

        string euroKuru() {
            if(CheckForInternetConnection()){
                string adres = "http://www.EXAMPLE.com"; //1
                WebRequest istek = HttpWebRequest.Create(adres); //2
                WebResponse cevap; //3
                cevap = istek.GetResponse(); //4
                StreamReader donenBilgiler = new StreamReader(cevap.GetResponseStream()); //5
                string gelen = donenBilgiler.ReadToEnd(); //6
                donenBilgiler.Close();
                int titleIndexBaslangici = gelen.IndexOf("beur") + 183; //7
                int titleIndexBitisi = gelen.Substring(titleIndexBaslangici).IndexOf("http://kur.EXAMPLE.com/kur/euro") + 7; //8
                string baslik = gelen.Substring(titleIndexBaslangici, titleIndexBitisi);
                return baslik;
            }
        else
    {

                return "Internet bağlantısı yok!";
    }


        }

       string[] returnToText(string[] texts)
        {

            baglanti.Open();
            string[] sonuc = new string[texts.Length];

                 string satis = "select * from musteri where idmusteri = '" + texts[0]+"'";
                SqlCommand yeni = new SqlCommand(satis, baglanti);
                yeni.ExecuteNonQuery();
                SqlDataReader dr = yeni.ExecuteReader();
                for (int i = 0; i < sonuc.Length; i++)
                {
                    sonuc[i] = returnIT(texts[i]);


                }
                baglanti.Dispose();
                baglanti.Close();

            return sonuc;

        }

        string veriCek(String connectionString)
        {
            try
            {
                baglanti.Open();
                int sonuc = 0;
                SqlCommand kmut = new SqlCommand(connectionString, baglanti);
                kmut.ExecuteNonQuery();
                SqlDataReader dr = kmut.ExecuteReader();
                while (dr.Read())
                {
                    sonuc = sonuc + Convert.ToInt32(dr["satistutari"].ToString());

                }

                baglanti.Close();
                baglanti.Dispose();

                return Convert.ToString(sonuc);
            }

            catch
            {
                return "";

            }


        }





        private void Form1_Load(object sender, EventArgs e)
        {
            String[] kurlar = new String[2];
            kurlar[0] = dolarKuru();
            kurlar[1] = euroKuru();

            dolarLbl.Text = kurlar[0];
            euroLbl.Text = kurlar[1];


            aylikKazanc.Text = veriCek(aylikveri)+".00 TL";
            hataLbl.Visible = false;
            hataLbl1.Visible = false;



            baglanti = new SqlConnection(baglantiYazisi);
            baglanti.Open();

                SqlCommand kmut = new SqlCommand(sonMusteri, baglanti);
                kmut.ExecuteNonQuery();



                SqlDataReader dr = kmut.ExecuteReader();

                int i = 0;
                while (dr.Read() && i != 8)
                {
                    musTrhArray[i] = dr["tarih"].ToString();
                    MusteriKayıtID[i] = dr["idmusteri"].ToString();
                    MusteriSehirArray[i] = dr["sehir"].ToString();
                    i++;
                }
                dr.Close();
                baglanti.Dispose();
                baglanti.Close();
                string[] isimler = returnToText(MusteriKayıtID);

                isimLbl.Text = isimler[0];
                isimLbl1.Text = isimler[1];
                isimLbl2.Text = isimler[2];
                isimLbl3.Text = isimler[3];
                isimLbl4.Text = isimler[4];
                isimLbl5.Text = isimler[5];
                isimLbl6.Text = isimler[6];
                isimLbl7.Text = isimler[7];




                musTrh.Text = musTrhArray[0];
                musTrh1.Text = musTrhArray[1];
                musTrh2.Text = musTrhArray[2];
                musTrh3.Text = musTrhArray[3];
                musTrh4.Text = musTrhArray[4];
                musTrh5.Text = musTrhArray[5];
                musTrh6.Text = musTrhArray[6];
                musTrh7.Text = musTrhArray[7];



                sehirLbl.Text = MusteriSehirArray[0];
                sehirLbl1.Text = MusteriSehirArray[1];
                sehirLbl2.Text = MusteriSehirArray[2];
                sehirLbl3.Text = MusteriSehirArray[3];
                sehirLbl4.Text = MusteriSehirArray[4];
                sehirLbl5.Text = MusteriSehirArray[5];
                sehirLbl6.Text = MusteriSehirArray[6];
                sehirLbl7.Text = MusteriSehirArray[7];
                baglanti.Open();
                SqlCommand komutu = new SqlCommand(sonSatis, baglanti);
                komutu.ExecuteNonQuery();
                dr = komutu.ExecuteReader();

                int j = 0;

                while (dr.Read() && j != 8)
                {
                    satisArray[j] = dr["tarih"].ToString();
                    satisAdetArray[j] = dr["adet"].ToString();
                    satisTutarArray[j] = dr["satistutari"].ToString();
                    satisMusterIsim[j] = dr["idmusteri"].ToString();
                    j++;
                }
                dr.Close();
                dr.Dispose();
                satisMusterIsim = returnToText(satisMusterIsim);

                saTrh.Text = satisArray[0];
                saTrh1.Text = satisArray[1];
                saTrh2.Text = satisArray[2];
                saTrh3.Text = satisArray[3];
                saTrh4.Text = satisArray[4];
                saTrh5.Text = satisArray[5];
                saTrh6.Text = satisArray[6];
                saTrh7.Text = satisArray[7];

                tutarLbl.Text = satisTutarArray[0];
                tutarLbl1.Text = satisTutarArray[1];
                tutarLbl2.Text = satisTutarArray[2];
                tutarLbl3.Text = satisTutarArray[3];
                tutarLbl4.Text = satisTutarArray[4];
                tutarLbl5.Text = satisTutarArray[5];
                tutarLbl6.Text = satisTutarArray[6];
                tutarLbl7.Text = satisTutarArray[7];

                adetLbl.Text = satisAdetArray[0];
                adetLbl1.Text = satisAdetArray[1];
                adetLbl2.Text = satisAdetArray[2];
                adetLbl3.Text = satisAdetArray[3];
                adetLbl4.Text = satisAdetArray[4];
                adetLbl5.Text = satisAdetArray[5];
                adetLbl6.Text = satisAdetArray[6];
                adetLbl7.Text = satisAdetArray[7];

                satisIsim.Text = satisMusterIsim[0];
                satisIsim1.Text = satisMusterIsim[1];
                satisIsim2.Text = satisMusterIsim[2];
                satisIsim3.Text = satisMusterIsim[3];
                satisIsim4.Text = satisMusterIsim[4];
                satisIsim5.Text = satisMusterIsim[5];
                satisIsim6.Text = satisMusterIsim[6];
                satisIsim7.Text = satisMusterIsim[7];
                baglanti.Dispose();
                baglanti.Close();

            }