选择文件

            OpenFileDialog fileDialog = new OpenFileDialog();
            fileDialog.Multiselect = true;
            //fileDialog.FileName = "D:软件";
            fileDialog.Title = "请选择文件";
            fileDialog.Filter = "所有文件(*.*)|*.*";
            fileDialog.InitialDirectory = "c:\\";//获取打开选择框的初始目录;
            fileDialog.ShowDialog();
            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);
            }

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);
            }