blic StreamReader OpenFile(唿叫OpenFile时，顺序可以完全颠倒：OpenFile(bufferSize: 4096, path: "foo.txt");
与COM组件互动.在C#中打开一个Word文件：static void Main(string[] args) {在C#中指定Excel的某一格文字：excelObj.Cells[5, 5].Value = "This is sample text";
泛型的