form1.cs

学生选课系统 可工学生学习用!大家可以互相学习互相借鉴

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

namespace selectcourse
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.TextBox textBox1;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.TextBox textBox2;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.Button button2;
		private System.Data.SqlClient.SqlDataAdapter sqlDataAdapter1;
		private System.Data.SqlClient.SqlConnection sqlConnection2;
		public bool valid;
		public int id;
		private System.Data.SqlClient.SqlCommand sqlSelectCommand1;
		private System.Data.SqlClient.SqlCommand sqlInsertCommand1;
		private System.Data.SqlClient.SqlCommand sqlUpdateCommand1;
		private System.Data.SqlClient.SqlCommand sqlDeleteCommand1;
		/// <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
			//
			this.valid=false;
		}

		/// <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.textBox1 = new System.Windows.Forms.TextBox();
			this.button1 = new System.Windows.Forms.Button();
			this.label1 = new System.Windows.Forms.Label();
			this.textBox2 = new System.Windows.Forms.TextBox();
			this.label2 = new System.Windows.Forms.Label();
			this.button2 = new System.Windows.Forms.Button();
			this.sqlDataAdapter1 = new System.Data.SqlClient.SqlDataAdapter();
			this.sqlDeleteCommand1 = new System.Data.SqlClient.SqlCommand();
			this.sqlConnection2 = new System.Data.SqlClient.SqlConnection();
			this.sqlInsertCommand1 = new System.Data.SqlClient.SqlCommand();
			this.sqlSelectCommand1 = new System.Data.SqlClient.SqlCommand();
			this.sqlUpdateCommand1 = new System.Data.SqlClient.SqlCommand();
			this.SuspendLayout();
			// 
			// textBox1
			// 
			this.textBox1.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.textBox1.Location = new System.Drawing.Point(128, 48);
			this.textBox1.Name = "textBox1";
			this.textBox1.Size = new System.Drawing.Size(121, 23);
			this.textBox1.TabIndex = 0;
			this.textBox1.Text = "";
			// 
			// button1
			// 
			this.button1.DialogResult = System.Windows.Forms.DialogResult.OK;
			this.button1.Font = new System.Drawing.Font("宋体", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.button1.Location = new System.Drawing.Point(72, 136);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(80, 32);
			this.button1.TabIndex = 2;
			this.button1.Text = "确定";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// label1
			// 
			this.label1.AutoSize = true;
			this.label1.Font = new System.Drawing.Font("宋体", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.label1.Location = new System.Drawing.Point(40, 48);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(55, 22);
			this.label1.TabIndex = 7;
			this.label1.Text = "学号：";
			// 
			// textBox2
			// 
			this.textBox2.Location = new System.Drawing.Point(128, 80);
			this.textBox2.Name = "textBox2";
			this.textBox2.PasswordChar = '*';
			this.textBox2.Size = new System.Drawing.Size(121, 23);
			this.textBox2.TabIndex = 1;
			this.textBox2.Text = "";
			// 
			// label2
			// 
			this.label2.AutoSize = true;
			this.label2.Location = new System.Drawing.Point(40, 88);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(48, 19);
			this.label2.TabIndex = 4;
			this.label2.Text = "密码：";
			// 
			// button2
			// 
			this.button2.DialogResult = System.Windows.Forms.DialogResult.Cancel;
			this.button2.Location = new System.Drawing.Point(192, 136);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(80, 32);
			this.button2.TabIndex = 3;
			this.button2.Text = "取消";
			this.button2.Click += new System.EventHandler(this.button2_Click);
			// 
			// sqlDataAdapter1
			// 
			this.sqlDataAdapter1.DeleteCommand = this.sqlDeleteCommand1;
			this.sqlDataAdapter1.InsertCommand = this.sqlInsertCommand1;
			this.sqlDataAdapter1.SelectCommand = this.sqlSelectCommand1;
			this.sqlDataAdapter1.TableMappings.AddRange(new System.Data.Common.DataTableMapping[] {
																									  new System.Data.Common.DataTableMapping("Table", "StudentInfo", new System.Data.Common.DataColumnMapping[] {
																																																					 new System.Data.Common.DataColumnMapping("ID", "ID"),
																																																					 new System.Data.Common.DataColumnMapping("mima", "mima")})});
			this.sqlDataAdapter1.UpdateCommand = this.sqlUpdateCommand1;
			// 
			// sqlDeleteCommand1
			// 
			this.sqlDeleteCommand1.CommandText = "DELETE FROM StudentInfo WHERE (ID = @Original_ID) AND (mima = @Original_mima OR @" +
				"Original_mima IS NULL AND mima IS NULL)";
			this.sqlDeleteCommand1.Connection = this.sqlConnection2;
			this.sqlDeleteCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@Original_ID", System.Data.SqlDbType.Int, 4, System.Data.ParameterDirection.Input, false, ((System.Byte)(0)), ((System.Byte)(0)), "ID", System.Data.DataRowVersion.Original, null));
			this.sqlDeleteCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@Original_mima", System.Data.SqlDbType.VarChar, 30, System.Data.ParameterDirection.Input, false, ((System.Byte)(0)), ((System.Byte)(0)), "mima", System.Data.DataRowVersion.Original, null));
			// 
			// sqlConnection2
			// 
			this.sqlConnection2.ConnectionString = "workstation id=A41;packet size=4096;user id=sa;integrated security=SSPI;data sour" +
				"ce=\".\";persist security info=False;initial catalog=selectcourse";
			// 
			// sqlInsertCommand1
			// 
			this.sqlInsertCommand1.CommandText = "INSERT INTO StudentInfo(ID, mima) VALUES (@ID, @mima); SELECT ID, mima FROM Stude" +
				"ntInfo WHERE (ID = @ID)";
			this.sqlInsertCommand1.Connection = this.sqlConnection2;
			this.sqlInsertCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@ID", System.Data.SqlDbType.Int, 4, "ID"));
			this.sqlInsertCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@mima", System.Data.SqlDbType.VarChar, 30, "mima"));
			// 
			// sqlSelectCommand1
			// 
			this.sqlSelectCommand1.CommandText = "SELECT ID, mima FROM StudentInfo";
			this.sqlSelectCommand1.Connection = this.sqlConnection2;
			// 
			// sqlUpdateCommand1
			// 
			this.sqlUpdateCommand1.CommandText = "UPDATE StudentInfo SET ID = @ID, mima = @mima WHERE (ID = @Original_ID) AND (mima" +
				" = @Original_mima OR @Original_mima IS NULL AND mima IS NULL); SELECT ID, mima F" +
				"ROM StudentInfo WHERE (ID = @ID)";
			this.sqlUpdateCommand1.Connection = this.sqlConnection2;
			this.sqlUpdateCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@ID", System.Data.SqlDbType.Int, 4, "ID"));
			this.sqlUpdateCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@mima", System.Data.SqlDbType.VarChar, 30, "mima"));
			this.sqlUpdateCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@Original_ID", System.Data.SqlDbType.Int, 4, System.Data.ParameterDirection.Input, false, ((System.Byte)(0)), ((System.Byte)(0)), "ID", System.Data.DataRowVersion.Original, null));
			this.sqlUpdateCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@Original_mima", System.Data.SqlDbType.VarChar, 30, System.Data.ParameterDirection.Input, false, ((System.Byte)(0)), ((System.Byte)(0)), "mima", System.Data.DataRowVersion.Original, null));
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(7, 16);
			this.ClientSize = new System.Drawing.Size(336, 189);
			this.Controls.Add(this.label2);
			this.Controls.Add(this.textBox2);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.textBox1);
			this.Controls.Add(this.button2);
			this.Controls.Add(this.button1);
			this.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.Name = "Form1";
			this.Text = "学生选课系统登陆";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			
			Application.Run(new MainForm());
		}

		private void button2_Click(object sender, System.EventArgs e)
		{
			//Application.Exit();
			this.Close();
		}

		private void button1_Click(object sender, System.EventArgs e)
		{
			sqlConnection2.Open();			
			sqlSelectCommand1.CommandText=("select mima from StudentInfo where ID='"+this.textBox1.Text+"'");
			SqlDataReader dbreader=sqlSelectCommand1.ExecuteReader();

			if(dbreader.Read())
			{
				if(dbreader.GetValue(0).ToString().Trim()==this.textBox2.Text.Trim())
				{
					this.valid=true;
					id=int.Parse(this.textBox1.Text);
					
				}
				else
				{
					MessageBox.Show("密码不正确");
					this.valid=false;
				}
			}
			else
			{
				MessageBox.Show("用户名不正确");
				this.valid=false;
			}
			dbreader.Close();
			sqlConnection2.Close();
		}
	}
}