第20课-数据库开采及ado.net 可空值类型,资料管理器,多规格查询,Case

foreach (DataRow dr in dt.Rows) { //只取ServerName
list.Add(dr[0].ToString()); }

        }

}

            //关闭请求流

/// summary /// 取得ComBox的数据源 /// /summary /// param name=dt/param
/// returns/returns private Liststring CreateCboDataSource(DataTable dt)
{ Liststring list = new Liststring();

        }

怎么将输入内容修改为保存到本地 50C
现在我这代码是输入内容用Codesoft打印出来,现在想修改为将输入内容保存为.txt格式到本地或网络盘,如txtTargetQty为4则每输入4个保存为一个文件,并且名称以第一个输入内容命名
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Data.OleDb;
using System.Diagnostics;
using System.Web;
using System.Net;
using System.Collections;

        {

return list; } } }

{

namespace PrintSN
{
public partial class MainForm : Form
{
private DataTable myDs = new DataTable();

        //完成事件

namespace EnumSqlServer { public partial class MainForm : Form { public
MainForm() { InitializeComponent(); }

{

 public MainForm() { InitializeComponent(); } private void txtInput_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == Keys.Enter) { string strInput = txtInput.Text; txtTargetQty.Text = Common.getConfigValueKey("PrintSNCount"); if (strInput.Equals { undo(); txtInput.SelectAll(); txtInput.Focus(); return; } else { if (dataGridView1.Rows.Count >0) { string strSN = ""; for (int i = 0; i < dataGridView1.Rows.Count; i++) { strSN = dataGridView1.Rows[i].Cells[0].Value.ToString(); if (strInput.Equals { ShowInformation("SN 重复,请扫描其他的SN ! ", "NG"); txtInput.SelectAll(); txtInput.Focus(); return; } } } if (txtScanQty.Text.Equals((Int32.Parse(txtTargetQty.Text) - 1).ToString { int index = this.dataGridView1.Rows.Add(); this.dataGridView1.Rows[index].Cells[0].Value = strInput; ArrayList SnDetail = new ArrayList(); for (int i = 0; i < dataGridView1.Rows.Count; i++) { SnDetail.Add(dataGridView1.Rows[i].Cells[0].Value.ToString; } SoftCodePrint Print = new SoftCodePrint(); Print.PrintSNLabel(strInput, SnDetail); txtScanQty.Text = "0"; dataGridView1.Rows.Clear(); ShowInformation("打印完成,请扫描的下一個SN ! ", "OK"); } else { txtScanQty.Text = (Int32.Parse(txtScanQty.Text) + 1).ToString(); ShowInformation("请扫描的下一個SN ! ", "OK"); int index = this.dataGridView1.Rows.Add(); this.dataGridView1.Rows[index].Cells[0].Value = strInput; } txtInput.SelectAll(); txtInput.Focus(); return; } } } private void undo() { //txtTargetQty.Text = ""; txtScanQty.Text = "0"; dataGridView1.Rows.Clear(); ShowInformation("UNDO 操作成功,請掃描 SN! ", "OK"); } private void ShowInformation(string sInfo, string sType) { lblShowMessageInfo.Text = sInfo; if (sType.Equals { lblShowMessageInfo.BackColor = System.Drawing.Color.FromArgb(((System.Byte), ((System.Byte), ((System.Byte); } if (sType.Equals { lblShowMessageInfo.BackColor = System.Drawing.Color.FromArgb(((System.Byte), ((System.Byte), ((System.Byte); } if (sType.Equals { lblShowMessageInfo.BackColor = System.Drawing.Color.Red; } } private void MainForm_Load(object sender, EventArgs e) { txtTargetQty.Text = Common.getConfigValueKey("PrintSNCount"); } private void MainForm_Shown(object sender, EventArgs e) { txtInput.SelectAll(); txtInput.Focus(); }}

        [WebMethod]

核心提示:using System;using System.Collections.Generic;using
System.ComponentModel;using System.Data;using System.Drawing;using
System.Text;using System.Windows.Forms;//所引入的命名空间

{

            int sum = 0;

using System; using System.Collections.Generic; using
System.ComponentModel; using System.Data; using System.Drawing; using
System.Text; using System.Windows.Forms;

                        item.AreaName = reader.GetString(1);

            string strURL
= “”;

//所引入的命名空间 using System.Data.Sql;

        }

        private void button1_Click(object sender, EventArgs e)

private void MainForm_Load(object sender, EventArgs e) {
//枚举本地网络内所有可用SqlServer实例 SqlDataSourceEnumerator instance =
SqlDataSourceEnumerator.Instance; //返回
//—————————————————————————-
// ServerName|服务器的名称
//—————————————————————————-
// InstanceName|服务器实例的名称。如果服务器作为默认实例运行,则为空白
//—————————————————————————-
// IsClustered|指示服务器是否属于群集
//—————————————————————————-
// Version|服务器的版本(SQLServer2000为8.00.x,SQLServer2005为9.00.x)
//—————————————————————————-
DataTable dt = instance.GetDataSources(); //绑定
cboServerList.DataSource = CreateCboDataSource(dt); }

                   {

        }

                        item.AreaId = reader.GetInt32(0);

}

            foreach (var item in listCity )

namespace WebService1

        {

 

using System.Text;

        {

        }

        private void button2_Click(object sender, EventArgs e)

                   

    /// Service1 的摘要说明

       /// <returns></returns>

            Stream s = response.GetResponseStream();

        {

        private void button1_Click(object sender, EventArgs e)

                LoadDataToTree(node.Nodes ,item.Areaid);

using System.Drawing;

           }

        /// </summary>

                    }

        //调用WebMethod的Async方法

               using (SqlCommand com=new SqlCommand (sql,con))

            writer.Write(payload, 0, payload.Length);

        }

            //获得请求流

        }

    /// <summary>

                }

        {

            List<Area> listCity = GetSubItemByParentId(pid);

        //利用Backgroundworker对象

using System.Collections.Generic;

            DataSet ds = new DataSet();

        private void button1_Click(object sender, EventArgs e)

using System.Collections.Generic;

           //加载省份信息到第一个ComboBox

using System.Data;

        public override string ToString()

using System.ComponentModel;

               using (SqlCommand com=new SqlCommand (sql,con))

    {

   public static  class SqlHelper

{

            //foreach (Area  item in listProvince)

 

                        item.AreaPid = reader.GetInt32(2);

using System.Linq;

       public static int ExecuteQuery(string sql,params SqlParameter[]
pms)

 

            itemDefault.AreaName = “请选择”;

    }

 

            return “Hello World”;

                        list.Add(model);

        //完成事件

        private void LoadDataToTree(TreeNodeCollection
treeNodeCollection, int pid)

using System.Text;

                        item.AreaId = reader.GetInt32(0);

        public Form3()

                }

Form1的代码为:

            //}

            writer.Close();

    {

        }

                ProvinceItem item=comboBox1.SelectedItem as
ProvinceItem;

 

     

            payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);

        private List<Area> GetSubItemByParentId(int pid)

        }

        {

        }

            //1.根据指定的Pid获取该城市下的子城市

            //调用服务的同时客户端处理并不停止

           {

            // Web Service代理类

    public partial class Form1 : Form

            dt.Columns.Add(“StuNo”, Type.GetType(“System.String”));

               //如何添加参数

{

{

 

        private void comboBox1_SelectedValueChanged(object sender,
EventArgs e)

using System.Linq;

        {

        {

            //为ComboBox 增加一个“请选择”

            DataRow dr = dt.NewRow();

        }

 

using System;

(5)在web引用名里输入一个服务名称,这里使用默认的名称localhost,点添加引用

            LoadDataToTree(treeView1.Nodes,0);

 

        {

using System.Collections.Generic;

            }

    public class Service1 : System.Web.Services.WebService

            itemDefault.AreaName = “请选择”;

            {

           return dt;

using System.Xml;

                       com.Parameters.AddRange(pms);

    }

       public int Areaid { get; set; }

        [WebMethod]

}

 

            comboBox1.SelectedIndex = 0;

 

                       con.Open();

 

using System.Windows.Forms;

            InitializeComponent();

       {

 

                   if (pms!=null)

 

using System.ComponentModel;

            strURL += this.textBox1.Text;

                       throw;

        }

              SqlConnection con=new SqlConnection (conStr);

 

            comboBox2.SelectedIndex = 0;

}

SqlHelper

            BackgroundWorker backgroundworker = new BackgroundWorker();

    }

        }

                   catch (Exception)

 

using System;

{

                    }

            string paraUrlCoded = HttpUtility.UrlEncode(“stuNo”);

using System.Data.SqlClient;

    /// </summary>

       }

            //将URL编码后的字符串转化为字节

using System.Drawing;

            request.ContentType = “application/x-www-form-urlencoded”;

           using (SqlConnection con=new SqlConnection (conStr))

            new Form3().Show();

}

            service.GetStudentByStuNoAsync(“002”);

           {

using System.Text;

                        Area model = new Area();

 

第20课-数据库开发及ado.net

        public int Sum(int x)

       {

            List<Student> list = new List<Student>();

                        model.AreaName = reader.GetString(1);

            Reader.MoveToContent();

       private static readonly string conStr =
ConfigurationManager.ConnectionStrings[“constr”].ConnectionString;

    {

using System.Text;

using System.Collections.Generic;

                //返回刚刚添加的这个节点

        private void button3_Click(object sender, EventArgs e)

{

            return null;

               
//加载第二个下来菜单,数据来源:根据第一个下拉菜单用户选项的AeraId来查询该项的所有子项

        /// 界面的进度条显示

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