C#文件操作的简单实例

文件的读取

 filestream fs = new filestream(@"d:\12.txt", filemode.open);
            byte[] buffer = new byte[1024 * 1024];
            fs.read(buffer, 0, buffer.length);
            string content = encoding.default.getstring(buffer);
            textbox1.text = content;
            fs.dispose();

文件的保存

 savefiledialog sfd = new savefiledialog();
            dialogresult rst = sfd.showdialog();
            if(rst==system.windows.forms.dialogresult.ok)
            {
                filestream fs = new filestream(sfd.filename,filemode.create);
                string content = textbox1.text;
                byte[] buffer = asciiencoding.utf8.getbytes(content);
                fs.write(buffer,0,buffer.length);
                fs.dispose();

文件的复制

filestream streamread = new filestream(@"d:\123.wmv",filemode.open);
            filestream streamwrite = new filestream(@"f:\1212.wmv",filemode.create);
            byte[]buffer=new byte[1024*1024*3];
            int length;
            do
            {
                length = streamread.read(buffer,0, buffer.length);
                streamwrite.write(buffer,0, length);
            }
            while (length == buffer.length);
            streamread.dispose();
            streamwrite.dispose();
            messagebox.show("copy success");