C#开发Winform实现学生管理系统
作者:農碼一生
这篇文章介绍了C#开发Winform实现学生管理系统的项目案例,文中通过示例代码介绍的非常详细。对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下
一、案例功能的实现
数据:
--专业 create table ProfessionInfo ( ProfessionID int primary key identity(1,1), --专业编号 professionName varchar(50) not null unique --专业名称 ) --学生 create table StudentInfo ( StuID varchar(20) primary key, --学生学号 StuName varchar(50) not null, --学生姓名 StuAge int not null check(StuAge > 0 and StuAge < 130), --学生年龄 StuSex char(2) not null check(StuSex in('男','女')), --学生性别 StuHobby nvarchar(100), --爱好 ProfessionID int not null references ProfessionInfo(ProfessionID), --所属专业编号 ) --添加专业信息 insert into ProfessionInfo(professionName) values('电子竞技') insert into ProfessionInfo(professionName) values('软件开发') insert into ProfessionInfo(professionName) values('医疗护理') --插入学生信息 insert into StudentInfo(StuID,StuName,StuAge,StuSex,StuHobby,ProfessionID) values('001','刘备',18,'男','',1) insert into StudentInfo(StuID,StuName,StuAge,StuSex,StuHobby,ProfessionID) values('002','关羽',20,'男','',2) insert into StudentInfo(StuID,StuName,StuAge,StuSex,StuHobby,ProfessionID) values('003','张飞',19,'男','',2) insert into StudentInfo(StuID,StuName,StuAge,StuSex,StuHobby,ProfessionID) values('004','孙尚香',17,'女','',3)
业务需求:
(1)专业下拉框绑定专业表数据,网格控件绑定学生数据,并且点击"搜索"按钮可以多条件组合查询。
(2)选中某一行,右键可以弹出"删除"菜单,点击"删除"菜单可以删除学生数据。
(3)点击"新增"按钮,弹出新增窗体,在此窗体中完成学生的新增操作。
(4)选中某一行,点击"编辑"按钮,弹出编辑窗体,在此窗体中完成数据的修改。
备注:其中性别的单选框,以及爱好的多选框分别用两个Pannel容器包含。
实现代码:
(1)查询窗体绑定专业信息、绑定学生信息以及搜索功能代码:
#region 绑定专业信息到下拉框 private void BindProfession() { DataTable dt = new DataTable(); DBHelper.PrepareSql("select * from ProfessionInfo"); dt = DBHelper.ExecQuery(); DataRow dr = dt.NewRow(); dr["ProfessionID"] = 0; dr["professionName"] = "--请选择--"; dt.Rows.InsertAt(dr, 0); this.cmbPro.DataSource = dt; this.cmbPro.DisplayMember = "professionName"; this.cmbPro.ValueMember = "ProfessionID"; } #endregion #region 绑定学生数据 private void BindData() { string sql = "select * from StudentInfo inner join ProfessionInfo on StudentInfo.ProfessionID=ProfessionInfo.ProfessionID where 1 = 1 "; if(!this.cmbPro.SelectedValue.ToString().Equals("0")) sql += " and StudentInfo.ProfessionID = " + this.cmbPro.SelectedValue.ToString(); if(!this.txtName.Text.Equals("")) sql += " and StuName like '%" + this.txtName.Text + "%'"; this.dataGridView1.AutoGenerateColumns = false; DBHelper.PrepareSql(sql); this.dataGridView1.DataSource = DBHelper.ExecQuery(); } #endregion private void Form1_Load(object sender, EventArgs e) { BindProfession(); BindData(); } private void btSearch_Click(object sender, EventArgs e) { BindData(); }
(2)删除菜单代码:
private void 删除ToolStripMenuItem_Click(object sender, EventArgs e) { //添加是否确定删除的对话框 DialogResult result = MessageBox.Show("确定要删除数据吗,删除之后无法恢复!", "提示框", MessageBoxButtons.OKCancel, MessageBoxIcon.Question); if (result == DialogResult.Cancel) return; string stuid = this.dataGridView1.SelectedRows[0].Cells[0].Value.ToString(); string sql = "delete from StudentInfo where StuID = @StuID"; DBHelper.PrepareSql(sql); DBHelper.SetParameter("StuID", stuid); int rowCount = DBHelper.ExecNonQuery(); if (rowCount == 1) MessageBox.Show("删除成功!"); else MessageBox.Show("删除失败!"); BindData(); }
(3)添加学生信息窗体代码:
#region 绑定专业信息到下拉框 private void BindProfession() { DataTable dt = new DataTable(); DBHelper.PrepareSql("select * from ProfessionInfo"); dt = DBHelper.ExecQuery(); DataRow dr = dt.NewRow(); dr["ProfessionID"] = 0; dr["professionName"] = "--请选择--"; dt.Rows.InsertAt(dr, 0); this.cmbPro.DataSource = dt; this.cmbPro.DisplayMember = "professionName"; this.cmbPro.ValueMember = "ProfessionID"; } #endregion private void FrmAdd_Load(object sender, EventArgs e) { BindProfession(); } private void btAdd_Click(object sender, EventArgs e) { string sql = "insert into StudentInfo(StuID,StuName,StuAge,StuSex,StuHobby,ProfessionID) values(@StuID,@StuName,@StuAge,@StuSex,@StuHobby,@ProfessionID)"; DBHelper.PrepareSql(sql); DBHelper.SetParameter("StuID", this.txtId.Text); DBHelper.SetParameter("StuName",this.txtName.Text); DBHelper.SetParameter("StuAge",this.txtAge.Text); //性别处理 string sex = ""; if (this.rbBoy.Checked == true) sex = this.rbBoy.Text; if (this.rbGirl.Checked == true) sex = this.rbGirl.Text; DBHelper.SetParameter("StuSex", sex); //爱好处理 string hobby = ""; foreach (CheckBox ck in this.panel2.Controls) { if (ck.Checked == true) { if (!hobby.Equals("")) hobby += ","; hobby += ck.Text; } } DBHelper.SetParameter("StuHobby", hobby); DBHelper.SetParameter("ProfessionID",this.cmbPro.SelectedValue.ToString()); int rowCount = DBHelper.ExecNonQuery(); if (rowCount == 1) { MessageBox.Show("新增成功!"); this.Close(); } else { MessageBox.Show("新增失败!"); } }
(4)编辑学生信息窗体代码:
public string StuID { get; set; } //学生编号 #region 绑定专业信息到下拉框 private void BindProfession() { DataTable dt = new DataTable(); DBHelper.PrepareSql("select * from ProfessionInfo"); dt = DBHelper.ExecQuery(); DataRow dr = dt.NewRow(); dr["ProfessionID"] = 0; dr["professionName"] = "--请选择--"; dt.Rows.InsertAt(dr, 0); this.cmbPro.DataSource = dt; this.cmbPro.DisplayMember = "professionName"; this.cmbPro.ValueMember = "ProfessionID"; } #endregion private void BindDetail() { string sql = "select * from StudentInfo where StuID = " + this.StuID; DBHelper.PrepareSql(sql); DataTable dt = new DataTable(); dt = DBHelper.ExecQuery(); this.txtId.Text = dt.Rows[0]["StuID"].ToString(); this.txtName.Text = dt.Rows[0]["StuName"].ToString(); this.txtAge.Text = dt.Rows[0]["StuAge"].ToString(); this.cmbPro.SelectedValue = dt.Rows[0]["ProfessionID"].ToString(); //性别处理 if (dt.Rows[0]["StuSex"].ToString().Equals("男")) this.rbBoy.Checked = true; else this.rbGirl.Checked = true; //爱好处理 string[] arrHobby = dt.Rows[0]["StuHobby"].ToString().Split(','); foreach (string hobby in arrHobby) { foreach (CheckBox ck in this.panel2.Controls) { if (ck.Text.Equals(hobby)) ck.Checked = true; } } } private void FrmEdit_Load(object sender, EventArgs e) { BindProfession(); BindDetail(); } private void btUpdate_Click(object sender, EventArgs e) { string sql = "update StudentInfo set StuName=@StuName,StuAge=@StuAge,StuSex=@StuSex,StuHobby=@StuHobby,ProfessionID=@ProfessionID where StuID=@StuID"; DBHelper.PrepareSql(sql); DBHelper.SetParameter("StuName", this.txtName.Text); DBHelper.SetParameter("StuAge", this.txtAge.Text); //性别处理 string sex = ""; if (this.rbBoy.Checked == true) sex = this.rbBoy.Text; if (this.rbGirl.Checked == true) sex = this.rbGirl.Text; DBHelper.SetParameter("StuSex", sex); //爱好处理 string hobby = ""; foreach (CheckBox ck in this.panel2.Controls) { if (ck.Checked == true) { if (!hobby.Equals("")) hobby += ","; hobby += ck.Text; } } DBHelper.SetParameter("StuHobby", hobby); DBHelper.SetParameter("ProfessionID", this.cmbPro.SelectedValue.ToString()); DBHelper.SetParameter("StuID", this.StuID); int rowCount = DBHelper.ExecNonQuery(); if (rowCount == 1) { MessageBox.Show("修改成功!"); this.Close(); } else { MessageBox.Show("修改失败!"); } }
(5)查询窗体中"新增"和"编辑"按钮代码:
private void btAdd_Click(object sender, EventArgs e) { FrmAdd frm = new FrmAdd(); //frm.Owner = this; frm.Show(); } private void btEdit_Click(object sender, EventArgs e) { string stuid = this.dataGridView1.SelectedRows[0].Cells[0].Value.ToString(); FrmEdit frm = new FrmEdit(); frm.StuID = stuid; frm.Show(); }
二、补充:连接字符串配置
将数据库连接字符串直接写在C#代码中,如果连接字符串需要发生改变,必须在C#代码中修改,并且重新进行编译的操作,给软件实施带来了麻烦。
解决此问题,可以将数据库连接字符串存放在配置文件中。
(1)在项目中找到App.config文件,如果没有此文件可以添加一个应用程序配置文件,在此配置文件的configuration节点内部添加如下配置:
<connectionStrings> <add name="DefaultConn" connectionString="server=.;database=DBTEST;uid=sa;pwd=123456;"/> </connectionStrings>
(2)给项目添加引用"System.Configuration",并且将C#中连接字符串的赋值修改如下:
public static string connStr = ConfigurationManager.ConnectionStrings["DefaultConn"].ConnectionString;
到此这篇关于C#开发Winform实现学生管理系统的文章就介绍到这了。希望对大家的学习有所帮助,也希望大家多多支持脚本之家。