求一个c#做的winform 小程序

这是当年老师给的例题

using System;

using SystemCollectionsGeneric;

using SystemComponentModel;

using SystemData;

using SystemDrawing;

using SystemText;

using SystemWindowsForms;

using SystemDataOleDb;

namespace ex12_2

{

public partial class Form1 : Form

{

OleDbConnection myCon ;

OleDbDataAdapter myDA;

DataSet myDS ;

DataTable tab1 = new DataTable();

int n; //当前记录的索引值

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

myCon=new OleDbConnection("Provider=MicrosoftJetOLEDB40; Data Source=学生mdb");

myConOpen();

string s = "select from 成绩";

myDA = new OleDbDataAdapter(s,myCon );

//自动生成SQL命令,以便更新数据源

OleDbCommandBuilder builder = new OleDbCommandBuilder(myDA);

myDS = new DataSet();

myDAFill(myDS, "成绩表");

tab1 = myDSTables["成绩表"];

//MessageBoxShow(tab1RowsCountToString());

if (tab1RowsCount > 0)

{

n = 0;

textBox1Text = tab1Rows[0]["学号"]ToString();

textBox2Text = tab1Rows[0]["姓名"]ToString();

textBox3Text = tab1Rows[0]["成绩"]ToString();

}

}

private void button2_Click(object sender, EventArgs e)

{

//单击"后一条"按钮

if (n < tab1RowsCount - 1)

{

n++;

textBox1Text = tab1Rows[n]["学号"]ToString();

textBox2Text = tab1Rows[n]["姓名"]ToString();

textBox3Text = tab1Rows[n]["成绩"]ToString();

}

else

MessageBoxShow("当前记录是最后一条记录");

}

private void button1_Click(object sender, EventArgs e)

{

//单击"前一条"按钮

if (n > 0)

{

n--;

textBox1Text = tab1Rows[n]["学号"]ToString();

textBox2Text = tab1Rows[n]["姓名"]ToString();

textBox3Text = tab1Rows[n]["成绩"]ToString();

}

else

MessageBoxShow("当前记录是第一条记录");

}

private void button3_Click(object sender, EventArgs e)

{

//单击"插入记录"

DataRow dr=tab1NewRow(); //使用tab1的结构生成一个新行

dr["学号"] = textBox5Text;

dr["姓名"] = textBox6Text;

dr["成绩"] = textBox4Text;

tab1RowsAdd(dr); //将新行追加到tab1表的末尾

myDAUpdate(myDS, "成绩表");

n = tab1RowsCount - 1;

textBox1Text = textBox5Text;

textBox2Text = textBox6Text;

textBox3Text = textBox4Text;

}

private void button6_Click(object sender, EventArgs e)

{

//退出

Close();

}

private void button4_Click(object sender, EventArgs e)

{

//删除记录

if(MessageBoxShow("确实要删除当前记录么？","提示",MessageBoxButtonsYesNo)==DialogResultYes)

{

tab1Rows[n]Delete();

myDAUpdate(myDS, "成绩表");

//删除记录后,显示被删记录的下一条记录

if (n < tab1RowsCount - 1)

n++;

else if (n > 0)

n--;

else

{

MessageBoxShow("表中已无记录");

return;

}

textBox1Text = tab1Rows[n]["学号"]ToString();

textBox2Text = tab1Rows[n]["姓名"]ToString();

textBox3Text = tab1Rows[n]["成绩"]ToString();

}

}

private void button5_Click(object sender, EventArgs e)

{

//更新记录

tab1Rows[n]["学号"] = textBox1Text;

tab1Rows[n]["姓名"] = textBox2Text;

tab1Rows[n]["成绩"] = textBox3Text;

myDAUpdate(myDS, "成绩表");

}

private void button7_Click(object sender, EventArgs e)

{

//按姓名查找

myDSClear();

OleDbCommand com1=new OleDbCommand();

com1CommandText= "select from 成绩 where 姓名='" + textBox7Text + "'";

com1Connection = myCon;

myDASelectCommand = com1;

myDAFill(myDS, "成绩表");

tab1 = myDSTables["成绩表"];

if (tab1RowsCount > 0)

{

n = 0;

textBox1Text = tab1Rows[0]["学号"]ToString();

textBox2Text = tab1Rows[0]["姓名"]ToString();

textBox3Text = tab1Rows[0]["成绩"]ToString();

}

else

MessageBoxShow("查无此人");

}

private void button8_Click(object sender, EventArgs e)

{

//重新显示

myDSClear();

OleDbCommand com1 = new OleDbCommand();

com1CommandText = "select from 成绩";

com1Connection = myCon ;

myDASelectCommand = com1;

myDAFill(myDS, "成绩表");

tab1 = myDSTables["成绩表"];

if (tab1RowsCount > 0)

{

n = 0;

textBox1Text = tab1Rows[0]["学号"]ToString();

textBox2Text = tab1Rows[0]["姓名"]ToString();

textBox3Text = tab1Rows[0]["成绩"]ToString();

}

}

}

}

这个简单：

网上有免费的天气接口：WebService

写个程序，调用WebService ，给你返回一个数组，数组里面就是你需要的结果。

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