C#打开文件

 private void OpenFile_Click(object sender, EventArgs e)

        {

            OpenFileDialog op = new OpenFileDialog();//弹出浏览框

            op.InitialDirectory = System.Environment.CurrentDirectory;//打开当前路径

            op.RestoreDirectory = true;//还原当前路径

            op.Filter = "XML文件(*.xml)|*.xml";//还原当前路径

            DialogResult result = op.ShowDialog();

            if (result == DialogResult.OK)

            {

                string filename = op.FileName;//获取文件路径

                MessageBox.Show(filename);

            }

        }

private void btnFile_Click(object sender, EventArgs e)//选择文件
        {
            OpenFileDialog fileDialog = new OpenFileDialog();
            fileDialog.Multiselect = true;
            fileDialog.Title = "请选择文件";
            fileDialog.Filter="所有文件(*.*)|*.*";
            if (fileDialog.ShowDialog() == DialogResult.OK)
            {
                string file=fileDialog.FileName;
                MessageBox.Show("已选择文件:" + file,"选择文件提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
            }
        }

        private void btnPath_Click(object sender, EventArgs e)//选择文件夹
        {
            FolderBrowserDialog dialog = new FolderBrowserDialog();
            dialog.Description = "请选择文件路径";
            if (dialog.ShowDialog() == DialogResult.OK)
            {
                string foldPath = dialog.SelectedPath;
                MessageBox.Show("已选择文件夹:" + foldPath, "选择文件夹提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }

        private void btnOpen_Click(object sender, EventArgs e)//打开文件
        {
            System.Diagnostics.Process.Start("Explorer.exe","c:\\windows");
        }

http://www.cnblogs.com/xugang/archive/2007/12/25/1013789.html

http://blog.csdn.net/lotusswan/article/details/19951