C#

中南林业科技大学C#考试题库及答案

1用C#设计一基于Window Form的应用程序，要求建立一access的数据库并配置好数据源，在Form内显示数据库内的数据，并能实现数据的查询

using System.Data.OleDb;

private void Form1_Load(object sender, EventArgs e)

{

CenterToScreen();

comboBox1.SelectedIndex = 0;

}

string str, sql;

OleDbConnection conn;

OleDbDataAdapter adap;

DataSet myds;

private void button1_Click(object sender, EventArgs e)

{

str = "Provider = microsoft.jet.oledb.4.0; data source = e:\\test.mdb";

conn = new OleDbConnection();

conn.ConnectionString = str;

try

{

conn.Open();

}

catch (Exception err1)

{

MessageBox.Show(err1.Message,"提¬¨¢示º?");

}

sql = "select * from t1";

adap = new OleDbDataAdapter(sql,conn);

myds = new DataSet();

adap.Fill(myds,"t1");

dataGridView1.DataSource=myds.Tables["t1"];

conn.Close();

}

private void button2_Click(object sender, EventArgs e)

{

if (textBox1.Text == "") return;

sql = "select * from t1 where " + comboBox1.Text + " like '%" + textBox1.Text + "%'"; adap = new OleDbDataAdapter(sql, conn);

myds = new DataSet();

adap.Fill(myds, "t2");

dataGridView1.DataSource = myds.Tables["t2"];

}

}

}

中南林业科技大学C#考试题库及答案

2 用C#设计一Window应用程序，要求能绘制点、直线，方式自定

namespace _2

{public partial class Form1 : Form

{public Form1()

{InitializeComponent();}

int flag = 0;

public class Myline

{ public Point start;

public Point end; }

List<Point> myPoint = new List<Point>();

List<Myline> myline = new List<Myline>();

Myline tmp_line;

int ispress=0;

Point expoint = new Point();

private void 点ToolStripMenuItem_Click(object sender, EventArgs e)

{flag = 1; Invalidate();}

private void 线ToolStripMenuItem_Click(object sender, EventArgs e)

{flag = 2; Invalidate();}

private void Form1_Paint(object sender, PaintEventArgs e)

{Graphics g = e.Graphics;

SolidBrush bu = new SolidBrush(Color.Red);

foreach (Point pt in myPoint)

{g.FillEllipse(bu, pt.X, pt.Y, 10, 10); }

bu.Dispose();

Pen mypen = new Pen(Color.Blue);

foreach (Myline m1 in myline)

{g.DrawLine(mypen, m1.start, m1.end); }

mypen.Dispose();}

private void Form1_MouseDown(object sender, MouseEventArgs e)

{ispress = 1;

if (flag == 2 && ispress != 0)

{tmp_line=new Myline();

tmp_line.start = new Point(e.X, e.Y);

expoint.X = e.X;

expoint.Y = e.Y; }}

private void Form1_MouseUp(object sender, MouseEventArgs e)

{ ispress = 0;

if (flag == 2)

{tmp_line.end = new Point(e.X, e.Y); myline.Add(tmp_line); Invalidate();}}

private void Form1_MouseMove(object sender, MouseEventArgs e)

{if (flag == 2 && ispress == 1)

{if (tmp_line == null) return;

if (tmp_line.start == null) return;

ControlPaint.DrawReversibleLine(PointToScreen(tmp_line.start), PointToScreen(expoint), Color.Gold);

ControlPaint.DrawReversibleLine(PointToScreen(tmp_line.start), PointToScreen(new Point(e.X, e.Y)),

中南林业科技大学C#考试题库及答案

Color.Gold);

expoint.X = e.X; expoint.Y = e.Y; }}

private void Form1_MouseClick(object sender, MouseEventArgs e)

{if (flag == 1)

{myPoint.Add(new Point(e.X, e.Y)); }

Invalidate();}}} 3 用C#设计一Window应用程序，要求能在屏幕上输出三种颜色、三种字体的一行文字： “Visual C++ 高级程序设计”

namespace _3

{ public partial class Form1 : Form

{public Form1()

{InitializeComponent();}

private void 红ToolStripMenuItem_Click(object sender, EventArgs e)

{label1.ForeColor = Color.Red; }

private void 宋体ToolStripMenuItem_Click(object sender, EventArgs e)

{ label1.Font = new Font("宋体", 15, FontStyle.Bold); }}}

4用C#设计一Window应用程序，要求能在屏幕上显示鼠标的当前位置并在鼠标移动的时候能实时显示

namespace _4

{public partial class Form1 : Form

{public Form1()

{InitializeComponent();}

private void Form1_MouseMove(object sender, MouseEventArgs e)

{ int x= e.X;

int y= e.Y; toolStripStatusLabel1.Text="<"+x+","+y+">";}}}

5用C#设计一Window应用程序，按“A”画圆 按“B”键画矩形 “C”键画三角形

namespace _5

{public partial class Form1 : Form

{public Form1()

{InitializeComponent();}

int flag = 0;

List<Point> yuanList = new List<Point>();

List<Point> juxingList = new List<Point>();

List<mySanJiaoXing> sanjiaoxingList = new List<mySanJiaoXing>();

mySanJiaoXing SanJiaoXing = new mySanJiaoXing();

public class mySanJiaoXing

{public mySanJiaoXing()

{savepolygonPoints = new List<Point>();}

public List<Point> savepolygonPoints; }

private void Form1_KeyDown(object sender, KeyEventArgs e)

{if (e.KeyCode == Keys.A)

{flag = 1;}

if (e.KeyCode == Keys.B)

{flag = 2 }

中南林业科技大学C#考试题库及答案

if (e.KeyCode == Keys.C)

{ flag = 3; }}

private void Form1_Paint(object sender, PaintEventArgs e)

{Graphics g = this.CreateGraphics();

Pen ypen = new Pen(Color.Red, 8);

Pen jpen = new Pen(Color.Green, 8);

Pen spen = new Pen(Color.Blue, 8);

for (int i = 0; i < yuanList.Count; i++)

{ g.DrawEllipse(ypen, yuanList[i].X, yuanList[i].Y, 40, 40); }

for (int j = 0; j < juxingList.Count; j++)

{ g.DrawRectangle(jpen, juxingList[j].X, juxingList[j].Y, 80, 100);}

for (int k = 0; k < sanjiaoxingList.Count; k++)

{g.DrawPolygon(spen, sanjiaoxingList[k].savepolygonPoints.ToArray());}}

private void Form1_MouseClick(object sender, MouseEventArgs e)

{ if (flag == 1)

{yuanList.Add(new Point(e.X, e.Y)); Invalidate();}

if (flag == 3 && e.Button == MouseButtons.Left)

{SanJiaoXing.savepolygonPoints.Add(new Point(e.X, e.Y)); }

if (flag == 3 && e.Button == MouseButtons.Right)

{ SanJiaoXing.savepolygonPoints.Add(new Point(e.X, e.Y));

sanjiaoxingList.Add(SanJiaoXing);

SanJiaoXing = new mySanJiaoXing();

Invalidate(); } }

private void Form1_MouseDown(object sender, MouseEventArgs e)

{if (flag == 2)

{juxingList.Add(new Point(e.X, e.Y)); } }

private void Form1_MouseUp(object sender, MouseEventArgs e)

{if (flag == 2)

{juxingList.Add(new Point(e.X, e.Y)); Invalidate();} } }} 6 用C#设计一基于对话框的应用程序，要求建立一access的数据库，并在Form内显示数据库内的数据，并能实现数据的编辑

using System.Data.OleDb;

namespace _6ti

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

OleDbDataAdapter adapter;

DataSet myset;

OleDbConnection conn;

private void Form1_Load(object sender, EventArgs e)

{

中南林业科技大学C#考试题库及答案

conn = new OleDbConnection();

conn.ConnectionString = "provider=microsoft.jet.oledb.4.0;data source=F:\\Database1.mdb"; conn.Open();

adapter = new OleDbDataAdapter("select * from 表1", conn);

myset = new DataSet();

adapter.Fill(myset, "tabel");

dataGridView1.DataSource = myset.Tables["tabel"];

conn.Close();

}

private void button1_Click(object sender, EventArgs e)

{

OleDbCommandBuilder bulider = new OleDbCommandBuilder(adapter);

if (myset.HasChanges())

{

try

{ adapter.Update(myset, "tabel");

}

catch (Exception eee)

{

MessageBox.Show(eee.Message);

}

MessageBox.Show("保存成功", "信息提示"); 7 创建一个如下图的应用程序，程序运行时在“输入数据”文本框中输入角度值，选择单选按钮确定计算正弦还是余弦值，单击“计算”按钮计算出相应三角函数值，并将计算结果显示“计算结果”文本框中，如果没有选择任何单选按钮，则提示“请选择计算类别”，单击“退出”退出应用程序。

namespace _7

{public partial class Form1 : Form

{ public Form1()

{InitializeComponent();}

int aa = 0;

private void button2_Click(object sender, EventArgs e)

{this.Close();}

private void radioButton1_CheckedChanged(object sender, EventArgs e)

{aa = 1; }

private void radioButton2_CheckedChanged(object sender, EventArgs e)

{aa = 2; }

private void button1_Click(object sender, EventArgs e)

{

double a = double.Parse(this.textBox1.Text); double b;

if (aa == 2)

{b = Math.Cos(Math.PI / 180 * a);

this.textBox2.Text = b.ToString();

}