C#项目学习技术总结 (1)
C#项目学习技术总结 (1)：sql
（1）窗体隐藏ide
this.Hide();Form2 form2 = new Form2();
form2.ShowDialog();会实现隐藏主窗口功能。
form2.Show();则不会 。
（2）S Q L图片的存储
Byte[] pic = null;
MemoryStream ms = new MemoryStream();
pictureBox1.Image.Save(ms, ImageFormat.Jpeg);//把图片存储到流中
pic = new Byte[ms.Length];
ms.Position = 0;//把流的起点位置设为0
ms.Read(pic, 0, Convert.ToInt32(ms.Length));
String sqlstr = "update StudentName set pic=@pictuer where nostudent=@id";
SqlConnection con = Class1.conn;//建立SqlConnection
SqlCommand sqlcom = new SqlCommand(sqlstr, con);//建立SqlCommand
con.Open();//打开SQL链接
sqlcom.Parameters.Add("@pictuer", SqlDbType.Image);//参数的填加
sqlcom.Parameters.Add("@id", SqlDbType.NChar);
sqlcom.Parameters["@pictuer"].Value = pic; //参数的赋值
sqlcom.Parameters["@id"].Value = textBox2.Text;
sqlcom.ExecuteNonQuery();//执行命令
con.Close();
（3）S Q L图片的读取
SqlConnection conn = Class1.conn;
SqlCommand mycom = new SqlCommand("select * from studentName where nostudent='" + textBox2.Text + "'", conn);
conn.Open();
SqlDataReader dr = mycom.ExecuteReader();
dr.Read();
MemoryStream mstream = new MemoryStream((byte[])dr[6]);//建立图片流对象
pictureBox1.Image = Image.FromStream(ms);
//或this.pictureBox1.Image = new Bitmap(mstream);
（4）ToolBar 控件的运用
-1- 在Buttons 集合中添加按钮项。
-2-为ToolBar添加Images.
添加p_w_picpathList控件，而后为其添加图片。
完毕
事件响应处理 ：
private void toolBar1_ButtonClick(object sender, ToolBarButtonClickEventArgs e)
{
switch (toolBar1.Buttons.IndexOf(e.Button))
{
case 3:
MessageBox.Show("3");
break;
case 2:
MessageBox.Show("2");
break;
case 1:
MessageBox.Show("1");
break;
case 0:
MessageBox.Show("0");
break;
}
}
（5）ContextMenu 控件的运用
//为contextMenu1添加事件处理程序
for (int i=0 ; i< this.contextMenu1.MenuItems.Count ; i++)
{
MenuItem mi = contextMenu1.MenuItems[i];
mi.Click += new EventHandler(menuItem1_Click);
}
//为contextMenu2添加项和事件处理程序
for (int j = 56; j < FontFamily.Families.Length; j++)
{
MenuItem mi = new MenuItem();
mi.Text = FontFamily.Families[j].Name.ToString();
mi.Click += new EventHandler(menuItem2_Click);
this.contextMenu2.MenuItems.Add(mi);
}
（7）S Q L文本的保存
richTextBox1.SaveFile( "temp.rtf" ); //保存到temp.rtf中
stream = new FileStream("temp.rtf", FileMode.Open, FileAccess.Read); //在以文件流的形似读取出来
int size = Convert.ToInt32(stream.Length);
Byte[] rtf = new Byte[size];
stream.Read(rtf, 0, size); //从文件流中读取数据
try//进行保存
{
string strSqlCmd = "update examPaper set test=@photo,rightanswer ='"+ SetRight(this.textBox2.Text.Trim()).ToUpper() +"',type='"+ this.comboBox1.Text +"' where notest="+this.textBox1.Text;
SqlCommand cmd = new SqlCommand( strSqlCmd,conn );
conn.Open();
cmd.Parameters.Add("@photo",SqlDbType.Image);
cmd.Parameters["@photo"].Value =rtf;
int intS = cmd.ExecuteNonQuery();
}
.
.
.
.
（6）S Q L文本的读取
SqlDataReader dr=MyClass.ExecuteRead("select * from ExamPaper where notest="+Paperindex);
if (dr.Read())
{
Byte [] rtf =(byte[])dr["test"];
ASCIIEncoding encoding = new ASCIIEncoding();
richTextBox1.Rtf=encoding.GetString(rtf,0,Convert.ToInt32(rtf.Length));
（8）RichTextBox 文本字体的改变
Font myfont = new Font(myitem.Text,nowFont.Size);
this.richTextBox1.SelectionFont =myfont;
////////////////////////////////////////////////////////////////////////////////////////
private void ChangeStyle(FontStyle mystyle,Font nowfont)
{
Font myfont = new Font(nowfont,nowfont.Style | mystyle);
this.richTextBox1.SelectionFont=myfont;
}
Font nowFont=this.richTextBox1.SelectionFont;
if (nowFont == null)
return;
switch (e.Button.Tag.ToString())
{
case "0":
ChangeStyle(FontStyle.Bold,nowFont);
break;
case "1":
ChangeStyle(FontStyle.Italic,nowFont);
break;
case "2":
ChangeStyle(FontStyle.Underline,nowFont);
break;
case "3":
ChangeStyle(FontStyle.Strikeout,nowFont);
break;
case "4":
this.richTextBox1.SelectionFont=new Font(this.richTextBox1.SelectionFont,FontStyle.Regular);
break;
}
（9）S Q L存储过程（事例）
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
ALTER PROCEDURE [dbo].[sp_login] (@nostudent varchar(10),@mima varchar(10)) AS
declare @kcid varchar(10),
@classid varchar(10),
@times int,
@Usertime int,
@PaperNum int,
@mark int,
@kcname varchar(10),
@DateType varchar(10),
@names varchar(10)
if exists (select name from studentname where nostudent =@nostudent and mima=@mima)
begin
select @classid=banji,@names=name from studentname where nostudent =@nostudent
select @kcid=kcid, @DateType=DateType from tbl_xuanke where classid=@classid and stats='T'
select @times=times,@PaperNum=PaperNum,@mark=mark,@kcname=kcname from tbl_kc where kcid=@kcid
if @kcid is null
begin
select erro =1,errortext='考试尚未开放!!!'
return
end
if @times is null
begin
select erro =1,errortext='试卷没有设置好!!!'
return
end
if not exists(select * from record where nostudent=@nostudent )
begin
insert into record values(@nostudent,@kcid,0)
set @UserTime=0
end
else
begin
select @Usertime=UserTime from record where nostudent =@nostudent
if (@times * 60 <=@UserTime)
begin
select erro =1,errortext='考试时间已结束!'
return
end
end
select error=0,@nostudent,@names,@kcid,@kcname,@times,@PaperNum,@mark,@DateType,@Usertime
return
end
select error=1,errortext='无此考生或密码错误!'
--if exists(select * from record where nostudent=@nostudent)
//--执行存储过程查询
string sqlconn="sp_login '"+ this.txtKao.Text.Replace("'","\"") +"','"+this.txtPass.Text.Replace("'","\"") +"'";
SqlDataAdapter myada= new SqlDataAdapter(sqlconn,conn);