c#中如何使用OpenDialog控件和SaveDialog控件,打开文件和保存文件,要求要有源程序(winform)

private void menuItem3_Click(object sender, System.EventArgs e)

{

if(openFileDialog1.ShowDialog() == DialogResult.OK)

{

System.IO.StreamReader sr = new System.IO.StreamReader(openFileDialog1.FileName)

this.ActiveMdiChild.ActiveControl.Text=sr.ReadToEnd()

sr.Close()

}

}

private void menuItem4_Click(object sender, System.EventArgs e)

{

if((saveFileDialog1.ShowDialog() == DialogResult.OK))

{

System.IO.FileStream fs = (System.IO.FileStream)saveFileDialog1.OpenFile()

}

}

del拆分多个del的函数如下：

vari,WantedFragSize,RealToWrite:Integer

//声明两个文件流对象

//InStream为输入源文件流对象，OutStream为输出切割文件流对象

InStream,OutStream:TFileStream

S:Stringbegin

ifOpendialog1.Executethen

begin

SaveDialog1.Title:='输入你要保存的切割文件名'

IfSaveDialog1.Executethen

begin

WantedFragSize:=StrtoInt(Edit1.Text)//定义切割块大小

i:=0

//以只读的方式创建一个输入文件流对象

InStream:=TFileStream.Create(

OpenDialog1.FileName,fmOpenRead)

Try

//如果Instream流的当前指针位置不在末尾，就按照定义的块大小//来读出数据并存成文件

while(InStream.PositionBegin

s:=IntToStr(I)

whileLength(s)s:='.'+s

//生成切割文件的扩乎山展名，用三位数字来作为扩展名，方便组合文件

//如果InStream所剩的块大小小于定义的块大燃顷码小，则将皮哪剩下的块数//据存成文件

IfInStream.Size-InStream.PositionRealToWrite:=InStream.Size-InStream.Position

else

RealToWrite:=WantedFragSize

//创建一个输出文件流对象

OutStream:=TFileStream.Create(SaveDialog1.FileName+s,fmCreate)

try

OutStream.CopyFrom(InStream,RealToWrite)

Inc(i)

Finally

//释放输出文件流对象

OutStream.Free

end

end

Finally

InStream.Free

end

end

end

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