form1.cs

原代码详细说明是关于c++方面的希望可以帮助大家使用

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;
namespace Exam6_5
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.Label label3;
		private System.Windows.Forms.Label label4;
		private System.Windows.Forms.Label label5;
		private System.Windows.Forms.TextBox textBox2;
		private System.Windows.Forms.TextBox textBox3;
		private System.Windows.Forms.TextBox textBox4;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.Button button3;
		private System.Windows.Forms.TextBox textBox1;
		private System.Windows.Forms.Button button1;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows 窗体设计器生成的代码
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			this.label1 = new System.Windows.Forms.Label();
			this.textBox2 = new System.Windows.Forms.TextBox();
			this.textBox3 = new System.Windows.Forms.TextBox();
			this.textBox4 = new System.Windows.Forms.TextBox();
			this.label2 = new System.Windows.Forms.Label();
			this.label3 = new System.Windows.Forms.Label();
			this.label4 = new System.Windows.Forms.Label();
			this.button2 = new System.Windows.Forms.Button();
			this.label5 = new System.Windows.Forms.Label();
			this.button3 = new System.Windows.Forms.Button();
			this.textBox1 = new System.Windows.Forms.TextBox();
			this.button1 = new System.Windows.Forms.Button();
			this.SuspendLayout();
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(21, 28);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(82, 15);
			this.label1.TabIndex = 1;
			this.label1.Text = "选择州代码";
			// 
			// textBox2
			// 
			this.textBox2.Location = new System.Drawing.Point(115, 72);
			this.textBox2.Name = "textBox2";
			this.textBox2.Size = new System.Drawing.Size(145, 21);
			this.textBox2.TabIndex = 2;
			this.textBox2.Text = "";
			// 
			// textBox3
			// 
			this.textBox3.Location = new System.Drawing.Point(116, 107);
			this.textBox3.Name = "textBox3";
			this.textBox3.Size = new System.Drawing.Size(144, 21);
			this.textBox3.TabIndex = 3;
			this.textBox3.Text = "";
			// 
			// textBox4
			// 
			this.textBox4.Location = new System.Drawing.Point(116, 143);
			this.textBox4.Name = "textBox4";
			this.textBox4.Size = new System.Drawing.Size(144, 21);
			this.textBox4.TabIndex = 4;
			this.textBox4.Text = "";
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(58, 73);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(46, 18);
			this.label2.TabIndex = 5;
			this.label2.Text = "作者ID";
			// 
			// label3
			// 
			this.label3.Location = new System.Drawing.Point(60, 111);
			this.label3.Name = "label3";
			this.label3.Size = new System.Drawing.Size(44, 22);
			this.label3.TabIndex = 6;
			this.label3.Text = "性";
			// 
			// label4
			// 
			this.label4.Location = new System.Drawing.Point(60, 152);
			this.label4.Name = "label4";
			this.label4.Size = new System.Drawing.Size(20, 23);
			this.label4.TabIndex = 7;
			this.label4.Text = "州";
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(146, 189);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(46, 24);
			this.button2.TabIndex = 8;
			this.button2.Text = "<";
			this.button2.Click += new System.EventHandler(this.button2_Click);
			// 
			// label5
			// 
			this.label5.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
			this.label5.Location = new System.Drawing.Point(192, 188);
			this.label5.Name = "label5";
			this.label5.Size = new System.Drawing.Size(78, 24);
			this.label5.TabIndex = 9;
			this.label5.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
			// 
			// button3
			// 
			this.button3.Location = new System.Drawing.Point(268, 189);
			this.button3.Name = "button3";
			this.button3.Size = new System.Drawing.Size(46, 24);
			this.button3.TabIndex = 10;
			this.button3.Text = ">";
			this.button3.Click += new System.EventHandler(this.button2_Click);
			// 
			// textBox1
			// 
			this.textBox1.Location = new System.Drawing.Point(117, 25);
			this.textBox1.Name = "textBox1";
			this.textBox1.Size = new System.Drawing.Size(56, 21);
			this.textBox1.TabIndex = 0;
			this.textBox1.Text = "";
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(204, 22);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(64, 26);
			this.button1.TabIndex = 12;
			this.button1.Text = "查询";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(370, 241);
			this.Controls.Add(this.button1);
			this.Controls.Add(this.textBox1);
			this.Controls.Add(this.button3);
			this.Controls.Add(this.label5);
			this.Controls.Add(this.button2);
			this.Controls.Add(this.label4);
			this.Controls.Add(this.label3);
			this.Controls.Add(this.label2);
			this.Controls.Add(this.textBox4);
			this.Controls.Add(this.textBox3);
			this.Controls.Add(this.textBox2);
			this.Controls.Add(this.label1);
			this.Name = "Form1";
			this.Text = "参数查询案例";
			this.Load += new System.EventHandler(this.Form1_Load);
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}
		private void ShowPosition()
		{
			int iCnt;
			int iPos;
			iCnt = this.BindingContext[dsAuthors, "authors"].Count;
			iPos = this.BindingContext[dsAuthors, "authors"].Position + 1;
			if(iCnt == 0)
			{
				label5.Text = "(No records)";
			}
			else 
			{
				label5.Text = iPos.ToString() + " of " + iCnt.ToString() ;
			}
		}
		SqlDataAdapter sqlDataAdapter;
		DataSet dsAuthors;
		private void Form1_Load(object sender, System.EventArgs e)
		{
			SqlConnection myConnection = new SqlConnection();
			myConnection.ConnectionString = "server=localhost;uid=sa;pwd=;database=pubs";
			SqlCommand sqlCommand=new SqlCommand();
			sqlCommand.Connection=myConnection;
			sqlCommand.CommandType=CommandType.Text;
			sqlCommand.CommandText ="SELECT au_id, au_lname, state FROM authors WHERE state = @state";
			sqlCommand.Parameters.Add("@state",System.Data.SqlDbType.VarChar,2);
			sqlDataAdapter=new SqlDataAdapter();
			sqlDataAdapter.SelectCommand=sqlCommand;
			dsAuthors=new DataSet();
		}
		private void button2_Click(object sender, System.EventArgs e)
		{
			this.BindingContext[dsAuthors, "authors"].Position +=1 ;
			ShowPosition();
		}

		private void button3_Click(object sender, System.EventArgs e)
		{
			this.BindingContext[dsAuthors, "authors"].Position -=1 ;
			ShowPosition();

		}
		private void button1_Click(object sender, System.EventArgs e)
		{
			sqlDataAdapter.SelectCommand.Parameters["@state"].Value =textBox1.Text;
			dsAuthors.Clear();
			sqlDataAdapter.Fill(dsAuthors,"authors");
			textBox2.DataBindings.Clear();
			textBox3.DataBindings.Clear();
			textBox4.DataBindings.Clear();
			if(this.BindingContext[dsAuthors, "authors"].Count == 0)
			{
				MessageBox.Show("No authors found in " + textBox1.Text);
			}
			else
			{
				textBox2.DataBindings.Add(new Binding("Text",dsAuthors, "authors.au_id"));//Text为要绑定的控件属性，mydv为数据视图，productID为字段名称。
				textBox3.DataBindings.Add(new Binding("Text",dsAuthors, "authors.au_lname"));//Text为要绑定的控件属性，mydv为数据视图，productID为字段名称。
				textBox4.DataBindings.Add(new Binding("Text",dsAuthors, "authors.state"));//Text为要绑定的控件属性，mydv为数据视图，productID为字段名称。
				ShowPosition();
			}
		}
 	}
}