c# 写的windows 窗体应用程序 运行后 界面卡主不动 程序照样运行

    本人小白菜菜鸟，刚学会c# 不久，用vs2015写了几个程序，大致内容：循环读取文件夹内word信息，
    界面两个按钮，开始和停止。点开始后，程序运行，然后界面就卡主不动了，点停止没反应，点窗体上的叉叉也没反应，只能任务管理器结束进程。请问这是为什么？
    Ps:代码里面没有timer类的控件。
    部分代码如下：

其中的doc和app是全局变量
private static Word.Application app = new Word.Application();
private static Word.Document doc = null;

 private void button2_Click(object sender, EventArgs e)
        {
            var files = Directory.GetFiles(wordPath, "*.doc");
            foreach (var file in files)
            {
                button2.Text = "进行中。。。";
                wordName = file.Replace(textBox2.Text, "");
                textBox1.Text = wordName;
                textBox1.Refresh();
                string paperName = wordName.Replace(".doc", "");
                if (Sql.existsExam(paperName) > 0) {
                    listBox2.Items.Add ( "此试卷已存在！"+ file.ToString());
                    listBox2.Refresh();
                    continue;
                }
                try
                {
                    exam_id=Sql.getExamId();
                    wordNameSave = wordName.Substring(0, wordName.IndexOf("."));
                    String path = @"d:\word/img_hy/" + exam_id;
                    BaseClass.createFile(path);
                    BaseClass.writeFile("d:\\word\\log.txt", "**********************************************************************", 0, 1);
                    string log = file+"         "+ DateTime.Now.ToString();
                    BaseClass.writeFile("d:\\word\\log.txt",log, 0, 1);
                    doc = app.Documents.Open(file);   //一会要记录word打开的文档
                    string strContent = ReadWordMian.readWordMain(app, doc, path, wordNameSave);
                    Sql.insertExam(ReadWordMian.paperHead,exam_id, grade_id, subject_id);
                    cutExercises(strContent);
                    log = "we have a finish !   " + wordNameSave + "   " + DateTime.Now.ToString();
                    //Console.WriteLine(DateTime.Now.ToString());
                    BaseClass.writeFile("d:\\word\\log.txt", log, 0, 1);
                }
                catch (Exception err) {
                    button2.Text = "批量入库";
                    //listBox2.Items.Add("异常："+"此文件读取异常"+ file+"  "+err);
                    BaseClass.writeFile("d:\\word\\log.txt", "异常：" + "此文件读取异常" + file + "  " + err, 0, 1);
                }
            }
            // listBox2.Items.Add(error_string);
            doc.Close();
            System.Runtime.InteropServices.Marshal.ReleaseComObject(doc);
            app.Quit();
            System.Runtime.InteropServices.Marshal.ReleaseComObject(app);
            button2.Text = "批量入库";
        }

通常你描述的情况，是因为你点击的按键的事件方法没有执行完，程序没有从方法里返回，所以主界面操作不了。
而你的这个button2_Click 事件响应方法里面有很多sql的操作，你可以添加一些断点判断程序卡在哪个地方了。

你看看是不是运行之后没有结束程序

panel设置检查一下吧

采用多线程加委托的方法解决

    private void button2_Click(object sender, EventArgs e)
        {
        button2.BeginInvoke(new Action(() =>
        {
            var files = Directory.GetFiles(wordPath, "*.doc");
            foreach (var file in files)
                {
                button2.Text = "进行中。。。";
                wordName = file.Replace(textBox2.Text, "");
                textBox1.Text = wordName;
                textBox1.Refresh();
                string paperName = wordName.Replace(".doc", "");
                if (Sql.existsExam(paperName) > 0)
                    {
                    listBox2.Items.Add("此试卷已存在！" + file.ToString());
                    listBox2.Refresh();
                    continue;
                    }
                try
                    {
                    exam_id = Sql.getExamId();
                    wordNameSave = wordName.Substring(0, wordName.IndexOf("."));
                    String path = @"d:\word/img_hy/" + exam_id;
                    BaseClass.createFile(path);
                    BaseClass.writeFile("d:\\word\\log.txt", "**********************************************************************", 0, 1);
                    string log = file + "         " + DateTime.Now.ToString();
                    BaseClass.writeFile("d:\\word\\log.txt", log, 0, 1);
                    doc = app.Documents.Open(file);   //一会要记录word打开的文档
                    string strContent = ReadWordMian.readWordMain(app, doc, path, wordNameSave);
                    Sql.insertExam(ReadWordMian.paperHead, exam_id, grade_id, subject_id);
                    cutExercises(strContent);
                    log = "we have a finish !   " + wordNameSave + "   " + DateTime.Now.ToString();
                    //Console.WriteLine(DateTime.Now.ToString());
                    BaseClass.writeFile("d:\\word\\log.txt", log, 0, 1);
                    }
                catch (Exception err)
                    {
                    button2.Text = "批量入库";
                    //listBox2.Items.Add("异常："+"此文件读取异常"+ file+"  "+err);
                    BaseClass.writeFile("d:\\word\\log.txt", "异常：" + "此文件读取异常" + file + "  " + err, 0, 1);
                    }
                }
            // listBox2.Items.Add(error_string);
            doc.Close();
            System.Runtime.InteropServices.Marshal.ReleaseComObject(doc);
            app.Quit();
            System.Runtime.InteropServices.Marshal.ReleaseComObject(app);
            button2.Text = "批量入库";
        }));

        }

                    这样就可以了，下次记住处理时间较长的代码时都要这样做。或者开线程来跑。但是开线程里面也要用到BeginInvoke

死锁了，先打断点一点一点看看是卡在哪里。找到原因后放到异步里面执行吧。
对了，，，有没有可能是你这个word文档没关啊

一段一段去测试吧，因该是有动作没有执行完，所以不能动