frmpicture.cs

学生类：Student 教师类：Teacher 主任：AdminTeacher 班主任：MasterTeacher 授课老师： PrelectTeacher 班级类：classTeam 班

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

namespace Forms
{
	/// <summary>
	/// frmPicture 的摘要说明。
	/// </summary>
	public class frmPicture : System.Windows.Forms.Form
	{
		//备份本图书原始封面图片地址，以便数据库更新失败时数据回滚
		private string TeaOldPic;
		//存放教师基本信息
		private Teacher teacher;
		private int teaID;

		private AdminTeacher Ateacher = null;
		private MasterTeacher Mteacher = null;
		private PrelectTeacher Pteacher = null;


		private System.Windows.Forms.Button btnChange;
		private System.Windows.Forms.Button btnUpdate;
		private System.Windows.Forms.Button btnCancel;
		private System.Windows.Forms.OpenFileDialog openFileDialog;
		private System.Windows.Forms.PictureBox picTeacher;
		private System.Windows.Forms.TextBox txtTeacherPic;
		private System.Windows.Forms.Label lblTeacherPic;
		private System.Windows.Forms.Label lblTeacher;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		//构造方法
		public frmPicture()
		{
			//
			// 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
			//
			Post.EventSendLoginedID += new DataAccess.Post.SendMsgDelegate(Post_EventSendLoginedID);
		}

		/// <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.btnChange = new System.Windows.Forms.Button();
			this.btnUpdate = new System.Windows.Forms.Button();
			this.btnCancel = new System.Windows.Forms.Button();
			this.picTeacher = new System.Windows.Forms.PictureBox();
			this.txtTeacherPic = new System.Windows.Forms.TextBox();
			this.lblTeacherPic = new System.Windows.Forms.Label();
			this.openFileDialog = new System.Windows.Forms.OpenFileDialog();
			this.lblTeacher = new System.Windows.Forms.Label();
			this.SuspendLayout();
			// 
			// btnChange
			// 
			this.btnChange.Font = new System.Drawing.Font("隶书", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.btnChange.Location = new System.Drawing.Point(40, 72);
			this.btnChange.Name = "btnChange";
			this.btnChange.Size = new System.Drawing.Size(104, 32);
			this.btnChange.TabIndex = 2;
			this.btnChange.Text = "修改封面";
			this.btnChange.Click += new System.EventHandler(this.btnChange_Click);
			// 
			// btnUpdate
			// 
			this.btnUpdate.Font = new System.Drawing.Font("隶书", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.btnUpdate.Location = new System.Drawing.Point(144, 72);
			this.btnUpdate.Name = "btnUpdate";
			this.btnUpdate.Size = new System.Drawing.Size(104, 32);
			this.btnUpdate.TabIndex = 3;
			this.btnUpdate.Text = "更新封面";
			this.btnUpdate.Click += new System.EventHandler(this.btnUpdate_Click);
			// 
			// btnCancel
			// 
			this.btnCancel.Font = new System.Drawing.Font("隶书", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.btnCancel.Location = new System.Drawing.Point(248, 72);
			this.btnCancel.Name = "btnCancel";
			this.btnCancel.Size = new System.Drawing.Size(104, 32);
			this.btnCancel.TabIndex = 4;
			this.btnCancel.Text = "取消";
			this.btnCancel.Click += new System.EventHandler(this.btnCancel_Click);
			// 
			// picTeacher
			// 
			this.picTeacher.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
			this.picTeacher.Location = new System.Drawing.Point(224, 120);
			this.picTeacher.Name = "picTeacher";
			this.picTeacher.Size = new System.Drawing.Size(112, 144);
			this.picTeacher.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
			this.picTeacher.TabIndex = 5;
			this.picTeacher.TabStop = false;
			// 
			// txtTeacherPic
			// 
			this.txtTeacherPic.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.txtTeacherPic.Location = new System.Drawing.Point(144, 24);
			this.txtTeacherPic.Name = "txtTeacherPic";
			this.txtTeacherPic.Size = new System.Drawing.Size(224, 23);
			this.txtTeacherPic.TabIndex = 1;
			this.txtTeacherPic.Text = "";
			// 
			// lblTeacherPic
			// 
			this.lblTeacherPic.AutoSize = true;
			this.lblTeacherPic.Font = new System.Drawing.Font("隶书", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.lblTeacherPic.Location = new System.Drawing.Point(24, 24);
			this.lblTeacherPic.Name = "lblTeacherPic";
			this.lblTeacherPic.Size = new System.Drawing.Size(105, 22);
			this.lblTeacherPic.TabIndex = 0;
			this.lblTeacherPic.Text = "教师封面路径";
			// 
			// lblTeacher
			// 
			this.lblTeacher.BackColor = System.Drawing.SystemColors.HighlightText;
			this.lblTeacher.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
			this.lblTeacher.Font = new System.Drawing.Font("隶书", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.lblTeacher.Location = new System.Drawing.Point(40, 136);
			this.lblTeacher.Name = "lblTeacher";
			this.lblTeacher.Size = new System.Drawing.Size(128, 112);
			this.lblTeacher.TabIndex = 8;
			this.lblTeacher.Text = "图书名称";
			this.lblTeacher.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
			// 
			// frmPicture
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(392, 273);
			this.Controls.Add(this.lblTeacher);
			this.Controls.Add(this.picTeacher);
			this.Controls.Add(this.btnCancel);
			this.Controls.Add(this.btnUpdate);
			this.Controls.Add(this.btnChange);
			this.Controls.Add(this.txtTeacherPic);
			this.Controls.Add(this.lblTeacherPic);
			this.MaximizeBox = false;
			this.Name = "frmPicture";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "图书封面查看";
			this.Load += new System.EventHandler(this.frmPicture_Load);
			this.ResumeLayout(false);

		}
		#endregion

		//窗体加载事件
		private void frmPicture_Load(object sender, System.EventArgs e)
		{
			//建立教师实体
			teacher = new Teacher(teaID);
			lblTeacher.Text = "教师编号：" + teacher.TeaID.ToString() + "\n姓名：\n" + teacher.TeaName;
			TeaOldPic = teacher.TeaPicture;
			if( TeaOldPic != "")
			{
				txtTeacherPic.Text = TeaOldPic;
				try
				{
					picTeacher.Image = Image.FromFile(TeaOldPic);;
				}
				catch(Exception ex)
				{
					MessageBox.Show("路径" + TeaOldPic + "错误\n该路径下无法打开图片！","无效路径",MessageBoxButtons.OK,MessageBoxIcon.Error);
				}
			}
		}

		//订阅“邮递员”
		private void Post_EventSendLoginedID(object obj, object teacher, string formName)
		{
			teaID = (int)obj;
			if(teacher.GetType().ToString().Equals("BusinessRule.AdminTeacher"))
			{
				this.Ateacher = (AdminTeacher)teacher;
			}
			else if(teacher.GetType().ToString().Equals("BusinessRule.MasterTeacher"))
			{
				this.Mteacher = (MasterTeacher)teacher;
			}
			else
			{
				this.Pteacher = (PrelectTeacher)teacher;
			}
			Post.EventSendLoginedID -= new DataAccess.Post.SendMsgDelegate(Post_EventSendLoginedID);
		}

		//获得实例化好的用户实例
		public Teacher User
		{
			get
			{
				if(Ateacher != null)
				{
					return Ateacher;
				}
				else if(Mteacher != null)
				{
					return Mteacher;
				}
				else
				{
					return Pteacher;
				}
			}
		}

		//“修改封面”按钮
		private void btnChange_Click(object sender, System.EventArgs e)
		{
			openFileDialog = new OpenFileDialog();
			openFileDialog.Filter = "JPEG   and   GIF   Images(*.jpg;*.gif)|*.jpg;*.gif";   
			if( openFileDialog.ShowDialog() == DialogResult.OK )
			{
				txtTeacherPic.Text = openFileDialog.FileName;
				picTeacher.Image = Image.FromFile(txtTeacherPic.Text);
			}
		}

		//“更新封面”按钮
		private void btnUpdate_Click(object sender, System.EventArgs e)
		{
			try
			{			
				teacher.TeaPicture = txtTeacherPic.Text.Trim();
				Ateacher.UpdateTeacherInfo(teacher);
				MessageBox.Show("数据库更新成功！\n教师图片已经保存","成功",
					MessageBoxButtons.OK,MessageBoxIcon.Information);
				this.Close();
			}
			catch(Exception ex)
			{
				MessageBox.Show(ex.Message + "\n数据库更新失败！","失败",
					MessageBoxButtons.OK,MessageBoxIcon.Error);
				//数据回滚
				teacher.TeaPicture = TeaOldPic;
			}
		}

		//“取消”按钮
		private void btnCancel_Click(object sender, System.EventArgs e)
		{
			this.Close();
		}

		
	}
}