【正文】 s。ll bring you back some. When he reached the beach, Nicholas turned and walked slowly bac k in the direction of the dead fire, this time along the rim of dampened sand between the sea and the palms. He was thinking about machines. There were hundreds of thousands, perhaps millions, of machines out beyond the belt, but few or none of the sophisticated servant robots of Earththose were luxuries. Would Ignacio, in Brazil (whatever that was like), have had such luxuries? N icholas thought not。t know. Two, three days ago. Ignacio gave me something. I39。m not really me, I39。t even wet, and do you know something, N icholas? I39。ve swallowed so much I couldn39。m hollow and rotten and tur ning brown, dirt and old feathers, oozing away. Her beak will break through soon. Okay. Nicholas turned to go. I39。t he stay there? Did I tell you about the bird, Nicholas? She had been not listening again. What bird? I have a bird. Inside. She patted the flat stomach below her small breasts, and for a moment, Nicholas thought she had really found food. She sits in here. She has tangled a nest in my entrails, where she sits and tears at my breath with her beak. I look healthy to you, don39。s how the world is. Not in Brazil, maybe, Nicholas said. He was trying to remember something about Brazil, but the only thing he could think of was a parrot singing in a straw hat from the view cartoons。t other people around all the time . Remember that? a Only there. are other people around all the time。t want anyone around him. Nicholas said slowly, Dr. Island said lots of people wouldn39。t anyone,` just the machines. Now he doesn39。s emptie than it used to be. Where Ignacio was, there would have been Red Indian hunters two or three hundr ed years ago。s a bit frightened of us. Have you ever talked to him, Nicholas? Today I did a little. He told me a story about a pet fish he used to have. Ignacio grew up all alone。s Nicholas, and I called you. Then I thought I might be wrong, or that it might be Ignacio. Ignacio was chasing me. Maybe he still is, but h think he39。t mistaken after all, was I? I didn39。 had Dr. Island used that sound to speak to him? He walked toward it and found a little rill that threa ded a way among the trees, and followed it. In a hundred steps it grew broader, slowed, and ended in a long blind pool under a dom e of leaves. . Diane was sitting on moss on the side opposite him。s head。 he remembered his effort to open a coconuthe had failed, but it was surely not impossible. His mind was hazy as to what a coconut might contain, but there had to be an edible core, because they were eaten in books. He decided to make a wide sweep through the jungle that would bring him back to the beach well away from Ignacio。 he was not as strong as he had been only a day past, and by this time next day he would probably be unable to outrun Ignacio. He should, he now realized, have eaten the monkey he had killed。 there was only the green hush. The light was still bright and strong and nearly, shadowless, but some interior sense told him the day, was nearly over, and he noticed that such faint shades as he could see stretched long, hor izontal distortions of their objects. He felt no hunger, but he had fasted be39。 there was none. He drew a deep breath then and said, Well, that39。 . sound in an atmosphere silent and unwa ked as Earth39。t run, N icholas, Dr. Island said with the voice of a wave. It only makes him angry that you run. N icholas did not answer, but cut to his left, up the beach and among the trunks of the palms, sprinting all the way because he had no way of knowing Ignacio was not right behind him, about to grab him by the neck. When he stopped it was in the thick jungle, among the boles of the hardwoods, where he leaned,.。 words, realizing that they were a signal, he turned and began to run, splashing through the shallow water. Ignacio ran after him, much helped by his longer legs, his hair flying behind his dark young face, his square teetheach white as a bone and as big as Nicholas39。 特此聲明！ 作者簽名： 2021 年 6 月 10 日 第 25 頁 /共 24 頁 Are you hungry now? No, I am tired and lazy now。 （ 5）學?？梢怨紝W位論文的全部或部分內容（保密學位論文在解密后遵守此規(guī)定）。 （ 3）學校可以學術交流為目的復制、贈送和 交換學位論文。 關于學位論文使用權和研究成果知識產權的說明 本人完全了解成都信息工程學院有關保管使用學位論文的規(guī)定，其中包括： （ 1）學校有權保管并向有關部門遞交學位論文的原件與復印件。文中除了特別加以標注地方外，不包含他人已經發(fā)表或撰寫過的研究成果，也不包含為獲得成都信息工程學院或其他教學機構的學位或證書而使用過的材料。在此表示我的謝意。 其次要感謝在畢業(yè)設計過程，對我的系統(tǒng)設計提出寶貴意見和建議的同學們。雖然該系統(tǒng)還有許多不盡如人意的地方，但是通過該次學習和實踐，我受益匪淺。 第 22 頁 /共 24 頁 [8] Richard Blum． C Network Programming[M]．北京： 電子工業(yè)出版社 ， 2021。 [6] Jeffrey Richter． Microsoft .NET 框架程序設計 [M]．北京： 機械工業(yè)出版社 ,2021。 [4] 劉友話． .Net 環(huán)境下數據庫應用系統(tǒng)開發(fā)技術 [M]．北京： 科學出版社 ， 2021。 [2] Mark Schmidt， Simon Robinson． Microsoft Visual C.NET2021 開發(fā)技巧大全 [M]．北京：中國水利水電出版社 ， 2021。畢業(yè)設計不僅是對我在大學所學知識的綜合運用，也是增長知識和經驗的好機會，同時也使我明白了面臨困難時應保持積極的心態(tài)，冷靜思考，認真處理才是真正解決困難的最好方法，通過畢業(yè)設計的鍛煉我自身的動手能力得到很大的提高，為即將走上工作崗位打下了良好實戰(zhàn)的基礎。 在開發(fā)過程中，我深刻體會到了 .NET 技術的魅力，認識到在網絡經濟到來的今天，掌握好一門計算機語言，并把它運用到力所能及的 應用程序開發(fā)中去的重要性和現(xiàn)實意義。根據任務書的要求我將整個系統(tǒng)化分為不同的模塊，然后就逐個模塊去一一詳細設計，設計的過程中不時地翻閱資料，用一些巧妙的技術來優(yōu)化程序。特別是對書中的一些基本實例，認真學習它的編程思想，吸取它的編程技巧， 弄懂程序中每句話的含義。最終結果表明，網上選課系統(tǒng)符合預定要求。 結果測試，在線選課系統(tǒng)基本完成了預定的任務。User Instance=True/ /appSettings 5 部署與測試 部署圖 圖 51 系統(tǒng)部署圖 模塊測試 在登錄系統(tǒng)后，當登錄者的身份不同的時候，系統(tǒng)將會把用戶導航到不同的頁面，在測試中，可以看到使用管理員身份、教師身份和學生身份登錄系統(tǒng)后界面與功能的不同，如下圖所示： 第 20 頁 /共 24 頁 圖 52 管理員登錄截圖 圖 53 教師登錄截圖 圖 54 學生登錄截圖 通過測試可以看到系統(tǒng)很好的完成了這個功能 。AttachDbFilename=|DataDirectory|\。 } } 數據庫鏈接設計 考慮系統(tǒng)的可維護性，系統(tǒng)的數據庫鏈接信息保存在配置文件中，當系統(tǒng)的數據庫需要更換的時候，只需要更改配置文件中的數據鏈接信息就可以將系統(tǒng)切換到新的環(huán)境中去。 } else { 第 19 頁 /共 24 頁 = true。 [0].0) { = ds。 0 amp。 if(ds!=null amp。 圖 414 教師查看選課學生截圖