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_3_2
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.ComboBox comboBox1;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.Label label3;
		private System.Windows.Forms.DataGrid dataGrid1;
		/// <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.comboBox1 = new System.Windows.Forms.ComboBox();
			this.label1 = new System.Windows.Forms.Label();
			this.label2 = new System.Windows.Forms.Label();
			this.label3 = new System.Windows.Forms.Label();
			this.dataGrid1 = new System.Windows.Forms.DataGrid();
			((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
			this.SuspendLayout();
			// 
			// comboBox1
			// 
			this.comboBox1.Location = new System.Drawing.Point(62, 3);
			this.comboBox1.Name = "comboBox1";
			this.comboBox1.Size = new System.Drawing.Size(136, 20);
			this.comboBox1.TabIndex = 0;
			this.comboBox1.SelectedIndexChanged += new System.EventHandler(this.comboBox1_SelectedIndexChanged);
			// 
			// label1
			// 
			this.label1.AutoSize = true;
			this.label1.Location = new System.Drawing.Point(8, 8);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(54, 17);
			this.label1.TabIndex = 1;
			this.label1.Text = "课程名称";
			// 
			// label2
			// 
			this.label2.AutoSize = true;
			this.label2.Location = new System.Drawing.Point(96, 149);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(42, 17);
			this.label2.TabIndex = 3;
			this.label2.Text = "人数：";
			// 
			// label3
			// 
			this.label3.AutoSize = true;
			this.label3.Location = new System.Drawing.Point(176, 149);
			this.label3.Name = "label3";
			this.label3.Size = new System.Drawing.Size(54, 17);
			this.label3.TabIndex = 4;
			this.label3.Text = "平均分：";
			// 
			// dataGrid1
			// 
			this.dataGrid1.CaptionVisible = false;
			this.dataGrid1.DataMember = "";
			this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
			this.dataGrid1.Location = new System.Drawing.Point(0, 32);
			this.dataGrid1.Name = "dataGrid1";
			this.dataGrid1.RowHeadersVisible = false;
			this.dataGrid1.Size = new System.Drawing.Size(320, 112);
			this.dataGrid1.TabIndex = 5;
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(320, 173);
			this.Controls.Add(this.dataGrid1);
			this.Controls.Add(this.label3);
			this.Controls.Add(this.label2);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.comboBox1);
			this.Name = "Form1";
			this.Text = "成绩查询";
			this.Load += new System.EventHandler(this.Form1_Load);
			((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}
		private SqlDataAdapter sqlDataAdapter;
		private DataSet dataSet;
		private void Form1_Load(object sender, System.EventArgs e)
		{
			comboBox1.Items.Add("所有");
			SqlConnection sqlConnection = new SqlConnection();
			sqlConnection.ConnectionString = "server=localhost;database=xsgl;uid=sa;pwd=;";
			SqlCommand sqlCommand=new SqlCommand();
			sqlCommand.Connection=sqlConnection;;
			sqlCommand.CommandType=CommandType.StoredProcedure;
			//调用存储过程getCourseName,将课程名称读取到组合框
			sqlCommand.CommandText="getCourseName";
			sqlConnection.Open();
			SqlDataReader dReader=sqlCommand.ExecuteReader();
			while(dReader.Read())
			{
				comboBox1.Items.Add(dReader["courseName"].ToString().Trim());
			}
			dReader.Close();
			sqlConnection.Close();
			//调用存储过程stat,先读取所有成绩		
			sqlCommand.CommandText="stat";
			sqlCommand.Parameters.Add("@count",System.Data.SqlDbType.Int);
			sqlCommand.Parameters["@count"].Direction=ParameterDirection.ReturnValue;		
			sqlCommand.Parameters.Add("@courseName",System.Data.SqlDbType.VarChar,30);
			sqlCommand.Parameters.Add("@avgScore",System.Data.SqlDbType.Float);
			sqlCommand.Parameters["@avgScore"].Direction=ParameterDirection.Output;
			sqlDataAdapter=new SqlDataAdapter(); 
			dataSet=new DataSet();
			sqlDataAdapter.SelectCommand=sqlCommand;
			sqlDataAdapter.SelectCommand.Parameters["@courseName"].Value="%";
			sqlDataAdapter.Fill(dataSet,"StudentScore");
			dataGrid1.DataSource=dataSet;
			dataGrid1.DataMember="StudentScore"; 
			comboBox1.SelectedIndex=0;
		}
		private void comboBox1_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			if(comboBox1.SelectedIndex==0)
				sqlDataAdapter.SelectCommand.Parameters["@courseName"].Value="%";
			else
				sqlDataAdapter.SelectCommand.Parameters["@courseName"].Value=comboBox1.SelectedItem;
			try
			{
				dataSet.Tables["StudentScore"].Clear();
				sqlDataAdapter.Fill(dataSet,"StudentScore");
				label3.Text="平均分:"+sqlDataAdapter.SelectCommand.Parameters["@avgScore"].Value.ToString().Trim();
				label2.Text="人数:"+sqlDataAdapter.SelectCommand.Parameters["@count"].Value.ToString().Trim();
			}
			catch(SqlException ee){System.Console.WriteLine(ee.Message);}
		}
	}
}