第10次作业第十次

usingusing ;usingSystem.Data;usingSystem.Drawing;usingusing ;usingSystem.Data;usingSystem.Drawing;usingSystem.Linq;usingSystem.Text;usingusingnamespace{ usingTBook=Tuple<string,string,decimal,string, publicpartialclassForm1: public privatevoid der,EventArgs publicclass publicstringName{get;set; publicstringAuthor{get;set; publicdecimalPrice{get;set; publicDateTimePubData{get;set; privatevoid publicDateTimePubData{get;set; privatevoid der,EventArgs listView1.Columns.Add("书名 listView1.Columns.Add("作者 listView1.Columns.Add("定价 时间 TBook[]books=new books[0]newTBook"高数","华"29,"高教"newDateTime(2009,4,11) books[1]newTBook"c语言""谭"38,"清大",newDateTime books[2]newTBook"数理逻辑","陆"0,nullnewDateTime(2002,2, books[3]newTBook"技艺","Knuth",119,"人电",newDateTime books[4]newTBook"算法导论","Cormen",85,null,newDateTime foreach(TBookbookin ListViewItemitem= }publicstringPress{get;set;usingusing{publicpartialclassForm1:{privateStudent[]public{students=new((Graduate)students[1]).Department=((Graduate)students[1]).Tutor"王家强((Undergraduate)students[2]).Department=}}{privatevoidder,EventArgs}{privatevoidder,EventArgs}forusingusing{publicpartialclassForm1:{privateStudent[]public{students=new((Graduate)students[1]).Department=((Graduate)students[1]).Tutor"王家强((Undergraduate)students[2]).Department=}}{privatevoidder,EventArgs}{privatevoidder,EventArgs}fori=0;i<Student.Departments.Length;{privatevoidder,EventArgsstudents[2]=newUndergraduate("003",""女",1,students[1]=newGraduate("002",","男"students[0]=newStudent("001",","女namespaceusingusingusingusingusing ; privatevoid der,EventArgs for i=0;i<students.Length;i++) if privatevoid der,EventArgs for i=0;i<students.Length;i++) if(students[i].ID== MessageBox.Show("Noinformationrequared!","Warming",MessageBoxButtons.OK, privatevoidShowSudentInfo(Students)//我把public改为了private但不知道为什么 textBox2.Text= textBox3.Text= //textBox3.Texts.Gender;前面学到的是对类的对象的Tostring方法重载，能否将 textBox5.Text=s.Grade.HasValue?s.Grade.ToString(): textBox4.Text= if(sis comboBox1.Enabled= comboBox1.Text textBox7.Text= textBox7.Enabled= elseif(sis comboBox1.Enabled= comboBox1.Text= textBox7.Enabled= textBox7.Text=privatevoidder,EventArgs}{comboBox1.Enabled=comboBox1.Text=textBox7.Text=textBox7.Enabled=}}{if(students[i].ID=={}}}publicvoidSaveStudentInfo(Student{fori=0;i<students.Length;{privatevoidder,EventArgs}{privatevoidder,EventArgs}{privatevoid}{comboBox1.Enabled=comboBox1.Text=textBox7.Text=textBox7.Enabled=}}{if(students[i].ID=={}}}publicvoidSaveStudentInfo(Student{fori=0;i<students.Length;{privatevoidder,EventArgs}{privatevoidder,EventArgs}{privatevoidder,EventArgs}{privatevoidder,EventArgs}{privatevoidder,EventArgs s.Gender= s.Grade .TryParse(textBox5.Text,outi)?i: s.Class .TryParse(textBox4.Text, s.Gender= s.Grade .TryParse(textBox5.Text,outi)?i: s.Class .TryParse(textBox4.Text,outi)?i: if(sis ((Undergraduate)s).Department=comboBox1.SelectedIndex>=0? .SelectedIndex: elseif(si