OpenFileDialog

using (OpenFileDialog fileSelectDialog = new OpenFileDialog())
{
    fileSelectDialog.Multiselect = false;
    fileSelectDialog.CheckFileExists = true;

    fileSelectDialog.Filter = "(*.dll,*.exe)|*.exe;*.exe|(所有文件)|*.*";
    fileSelectDialog.FilterIndex = 0;
    fileSelectDialog.FileOk += fileSelectDialog_FileOk;
    fileSelectDialog.ShowDialog();
}

(提示1)|筛选表达式1|文件说明2|筛选表达式2

(提示1;提示2;提示3)|筛选1;筛选2;筛选3;筛选4|(B提示1;B提示2;B提示3)|B筛选1;B筛选2;B筛选3;B筛选4