Exception
How do I use Exception
Below are practical examples compiled from projects for learning and reference purposes
Featured Snippets
| Line | Code | Ex.. |
|---|---|---|
| 118 | catch (Exception ex) | 1 |
| 106 | catch (Exception ex) | 2 |
| 116 | catch (Exception) | 3 |
| 44 | catch (Exception ex) | 4 |
| 78 | catch (Exception ex) | 5 |
| 132 | catch (Exception ex) | 6 |
| 156 | catch (Exception ex) | 7 |
| 209 | catch (Exception ex) | 8 |
| 234 | catch (Exception ex) | 9 |
| 257 | catch (Exception ex) | 10 |
File name: FormXemDiem.cs
Copy
85 private void btnXuatRaExcel_Click(object sender, EventArgs e)
86 {
87 try
88 {
89
90 Excel.Application objExcelApp = new Excel.Application();
91 Excel.Workbook objExcelWorkbook = objExcelApp.Workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet);
92 Excel.Worksheet objSheet = (Excel.Worksheet)objExcelWorkbook.Worksheets[1];
93 //objSheet.Cells.Interior.Color.ToString() = 'blue';
94 objSheet = (Excel.Worksheet)objExcelWorkbook.Sheets[1];
95 objSheet.Cells.HorizontalAlignment = Excel.Constants.xlCenter;
96 objSheet.Cells[2, 5] = "BẢNG ĐIỂM CỦA SINH VIÊN";
97 objSheet.Cells[5, 3] = "Mã Học Phần";
98 objSheet.Cells[5, 4] = "Mã Nhóm Học Phần";
99 objSheet.Cells[5, 5] = "Tên Học Phần";
100 objSheet.Cells[5, 6] = "Điểm Thi";
101 objSheet.Cells[5, 7] = "Điểm Quá Trình";
102 objSheet.Cells[5, 8] = "Điểm Xếp Loại";
103 objSheet.Cells[3, 3] = "Mã Học Kỳ : "+cmbMaHK.SelectedValue.ToString()+"";
104 objSheet.Cells[4, 3] = "Mã SV : " + txtMaSV.Text + "";
105 objSheet.Cells[9,10] = "ĐIỂM TỔNG KẾT";
106 objSheet.Cells[10,10] = "Hệ 10 : "+txtHe10.Text+"";
107 objSheet.Cells[11,10] = "Hệ 4 : "+txtHe4.Text+"";
108 for (int i = 0; i < dgvKetQua.Rows.Count ; i++)
109 {
110 for (int j = 0; j < dgvKetQua.Columns.GetColumnCount(DataGridViewElementStates.Displayed); j++)
111 {
112 objSheet.Cells[i + 6, j + 3] = dgvKetQua.Rows[i].Cells[j].Value.ToString();
113 objSheet.Columns.AutoFit();
114 }
115 }
116 objExcelApp.Visible = true;
117 }
118 catch (Exception ex)
119 {
120 MessageBox.Show(ex.Message);
121 }
122 }
File name: FormXemDiemLop.cs
Copy
77 private void btnXuatRaExcel_Click(object sender, EventArgs e)
78 {
79 try
80 {
81
82 Excel.Application objExcelApp = new Excel.Application();
83 Excel.Workbook objExcelWorkbook = objExcelApp.Workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet);
84 Excel.Worksheet objSheet = (Excel.Worksheet)objExcelWorkbook.Worksheets[1];
85 //objSheet.Cells.Interior.Color.ToString() = 'blue';
86 objSheet = (Excel.Worksheet)objExcelWorkbook.Sheets[1];
87 objSheet.Cells.HorizontalAlignment = Excel.Constants.xlCenter;
88 objSheet.Cells[2, 5] = "BẢNG ĐIỂM CỦA LỚP";
89 objSheet.Cells[3, 3] = "Mã Học Kỳ : "+cmbMaHK.SelectedValue.ToString()+"";
90 objSheet.Cells[4, 3] = "Mã Lớp : " + cmbMaLop.SelectedValue.ToString() + "";
91 objSheet.Cells[5, 4] = "Mã Sinh Viên";
92 objSheet.Cells[5, 5] = "Tên Sinh Viên";
93 objSheet.Cells[5, 6] = "Điểm Trung Bình";
94 //select sv.MaSV,TenSV,TrungBinhCuoiKyHe10
95
96 for (int i = 0; i < dgvKetQua.Rows.Count ; i++)
97 {
98 for (int j = 0; j < dgvKetQua.Columns.GetColumnCount(DataGridViewElementStates.Displayed); j++)
99 {
100 objSheet.Cells[i + 6, j + 4] = dgvKetQua.Rows[i].Cells[j].Value.ToString();
101 objSheet.Columns.AutoFit();
102 }
103 }
104 objExcelApp.Visible = true;
105 }
106 catch (Exception ex)
107 {
108 MessageBox.Show(ex.Message);
109 }
110 }
File name: frmLogin.cs
Copy
66 private void btLog_Click(object sender, EventArgs e)
67 {
68 try
69 {
70 if (txtdangnhap.Text == "" || txtmatkhau.Text == "")
71 {
72 MessageBox.Show("Bạn chưa điền đầy đủ thông tin", "Có lỗi xảy ra!");
73 txtdangnhap.Focus();
74 return;
75 }
76 if(txtdangnhap.Text=="admin" && txtmatkhau.Text=="admin")
77 {
78 if (MessageBox.Show("Chào mừng bạn đã đến với mục quản lý dành cho giáo viên", "Thông báo", MessageBoxButtons.OK) == DialogResult.OK)
79 {
80 this.Hide();
81 frmQuanLy_Admin admin = new frmQuanLy_Admin();
82 admin.ShowDialog();
83
84 }
85
86 }
87 else
88 {
89 SqlConnection con = new SqlConnection("server=.\\SQLEXPRESS;database=QL_Thitracnghiem;integrated security=true");
90 con.Open();
91 SqlCommand cmd = new SqlCommand("Select MatKhau from THISINH where TenDangNhap ='" + txtdangnhap.Text + "'", con);
92 SqlDataReader reader = cmd.ExecuteReader();
93 reader.Read();
94 if (txtmatkhau.Text == reader.GetValue(0).ToString())
95 {
96 MessageBox.Show("Bạn đã đăng nhập thành công!", "Thành công");
97 reader.Close();
98 con.Close();
99 this.Close();
100 frmLuaChon frmChon = new frmLuaChon();
101 frmChon.ShowDialog();
102 this.Hide();
103
104 }
105 else
106 {
107 MessageBox.Show("Sai Mật Khẩu");
108 txtmatkhau.Focus();
109 }
110 reader.Close();
111 con.Close();
112 }
113
114 }
115
116 catch (Exception)
117 {
118
119 MessageBox.Show("Tên đăng nhập và mật khẩu không hợp lệ","Có lỗi xảy ra");
120 txtdangnhap.Focus();
121
122 }
123 }
File name: frmThiThat.cs
Copy
34 void Load_DeThiThat()
35 {
36 try
37 {
38 SqlConnection cnn = new SqlConnection("server=.\\SQLEXPRESS;database=QL_Thitracnghiem;integrated security =true");
39 SqlDataAdapter da = new SqlDataAdapter("select cauhoi.mach,cauhoi,a,b,c,d ,dapan from cauhoi,DAPAN where cauhoi.mach=DAPAN.mach", cnn);
40 DataTable BangQuestion = new DataTable();
41 da.Fill(BangQuestion);
42 TaoBangRandomCauHoi(BangQuestion);
43 }
44 catch (Exception ex)
45 { MessageBox.Show(ex.Message); }
46 p = 60;//nhap thoi gian thi
47 s = 60;
48 h = 0;
49 }
File name: frmThiThat.cs
Copy
50 void TaoBangRandomCauHoi(DataTable BangQuestion)
51 {
52
53 try
54 {
55 Random Rnd = new Random();
56 ArrayList ArrQuestion = new ArrayList();
57
58 ArrQuestion.Clear();
59 int x, dem = 0;
60 int SoCauTrongBangGoc = BangQuestion.Rows.Count;
61 while (dem < SoCauNgauNhien)
62 {
63 x = Rnd.Next(0, SoCauTrongBangGoc);
64 if (!ArrQuestion.Contains(x))
65 {
66 ArrQuestion.Add(x);
67 dem++;
68 }
69 }
70 for (int j = SoCauTrongBangGoc - 1; j >= 0; j--)
71 if (!ArrQuestion.Contains(j))
72 BangQuestion.Rows.RemoveAt(j);
73
74 BangDeThi = BangQuestion;
75 BangDeThi.Columns.Add("cauhoi,DAPAN");
76
77 }
78 catch (Exception ex)
79 { MessageBox.Show(ex.Message); }
80
81 }
File name: frmThiThat.cs
Copy
82 void TaoBangRandomCauTraLoi()
83 {
84 try
85 {
86 SoCauHoi = BangDeThi.Rows.Count;
87 string DapAnDung = "";
88 string A, B, C, D;
89 int DapAn;
90 Random Rnd = new Random();
91 ArrayList ArrDapAn = new ArrayList();
92 for (int i = 0; i < SoCauHoi; i++)
93 {
94 A = "";
95 B = "";
96 C = "";
97 D = "";
98 DapAnDung = "";
99 DapAn = 0;
100 ArrDapAn.Clear();
101 ArrDapAn.Add(2);
102 ArrDapAn.Add(3);
103 ArrDapAn.Add(4);
104 ArrDapAn.Add(5);
105
106 DapAn = Rnd.Next(ArrDapAn.Count);
107 A = BangDeThi.Rows[i][(int)ArrDapAn[DapAn]].ToString();
108 if ((BangDeThi.Rows[i][6].ToString().ToUpper().Contains("A") && (int)ArrDapAn[DapAn] == 2) || (BangDeThi.Rows[i][6].ToString().ToUpper().Contains("B") && (int)ArrDapAn[DapAn] == 3) || (BangDeThi.Rows[i][6].ToString().ToUpper().Contains("C") && (int)ArrDapAn[DapAn] == 4) || (BangDeThi.Rows[i][6].ToString().ToUpper().Contains("D") && (int)ArrDapAn[DapAn] == 5))
109 DapAnDung += "A";
110 ArrDapAn.RemoveAt(DapAn);
111 DapAn = Rnd.Next(ArrDapAn.Count);
112 B = BangDeThi.Rows[i][(int)ArrDapAn[DapAn]].ToString();
113 if ((BangDeThi.Rows[i][6].ToString().ToUpper().Contains("A") && (int)ArrDapAn[DapAn] == 2) || (BangDeThi.Rows[i][6].ToString().ToUpper().Contains("B") && (int)ArrDapAn[DapAn] == 3) || (BangDeThi.Rows[i][6].ToString().ToUpper().Contains("C") && (int)ArrDapAn[DapAn] == 4) || (BangDeThi.Rows[i][6].ToString().ToUpper().Contains("D") && (int)ArrDapAn[DapAn] == 5))
114 DapAnDung += "B";
115 ArrDapAn.RemoveAt(DapAn);
116 DapAn = Rnd.Next(ArrDapAn.Count);
117 C = BangDeThi.Rows[i][(int)ArrDapAn[DapAn]].ToString();
118 if ((BangDeThi.Rows[i][6].ToString().ToUpper().Contains("A") && (int)ArrDapAn[DapAn] == 2) || (BangDeThi.Rows[i][6].ToString().ToUpper().Contains("B") && (int)ArrDapAn[DapAn] == 3) || (BangDeThi.Rows[i][6].ToString().ToUpper().Contains("C") && (int)ArrDapAn[DapAn] == 4) || (BangDeThi.Rows[i][6].ToString().ToUpper().Contains("D") && (int)ArrDapAn[DapAn] == 5))
119 DapAnDung += "C";
120 ArrDapAn.RemoveAt(DapAn);
121 DapAn = Rnd.Next(ArrDapAn.Count);
122 D = BangDeThi.Rows[i][(int)ArrDapAn[DapAn]].ToString();
123 if ((BangDeThi.Rows[i][6].ToString().ToUpper().Contains("A") && (int)ArrDapAn[DapAn] == 2) || (BangDeThi.Rows[i][6].ToString().ToUpper().Contains("B") && (int)ArrDapAn[DapAn] == 3) || (BangDeThi.Rows[i][6].ToString().ToUpper().Contains("C") && (int)ArrDapAn[DapAn] == 4) || (BangDeThi.Rows[i][6].ToString().ToUpper().Contains("D") && (int)ArrDapAn[DapAn] == 5))
124 DapAnDung += "D";
125 BangDeThi.Rows[i][2] = A;
126 BangDeThi.Rows[i][3] = B;
127 BangDeThi.Rows[i][4] = C;
128 BangDeThi.Rows[i][5] = D;
129 BangDeThi.Rows[i][6] = DapAnDung;
130 }
131 }
132 catch (Exception ex)
133 { MessageBox.Show(ex.Message); }
134 }
File name: frmThiThat.cs
Copy
135 void LoadCauHoiVaoControl()
136 {
137
138 try
139 {
140 groupBox1.Text = "Câu: " + (CauHienTai + 1).ToString();
141 lbCauHoi.Text = BangDeThi.Rows[CauHienTai][1].ToString();
142 lbA.Text = BangDeThi.Rows[CauHienTai][2].ToString();
143 lbB.Text = BangDeThi.Rows[CauHienTai][3].ToString();
144 lbC.Text = BangDeThi.Rows[CauHienTai][4].ToString();
145 lbD.Text = BangDeThi.Rows[CauHienTai][5].ToString();
146
147 if (BangDeThi.Rows[CauHienTai][7].ToString().Contains("A"))
148 checkBox1.Checked = true;
149 if (BangDeThi.Rows[CauHienTai][7].ToString().Contains("B"))
150 checkBox2.Checked = true;
151 if (BangDeThi.Rows[CauHienTai][7].ToString().Contains("C"))
152 checkBox3.Checked = true;
153 if (BangDeThi.Rows[CauHienTai][7].ToString().Contains("D"))
154 checkBox4.Checked = true;
155 }
156 catch (Exception ex)
157 { MessageBox.Show(ex.Message); }
158 }
File name: frmThiThat.cs
Copy
190 private void frmThiThat_Load(object sender, EventArgs e)
191 {
192
193
194 lbNgaythang.Text = DateTime.Now.Day.ToString() + "/" + DateTime.Now.Month.ToString() + "/" + DateTime.Now.Year.ToString();
195
196 {
197 try
198 {
199 if (DeThi == true)
200 Load_DeThiThat();
201 else
202 Load_DeThiThat();
203 TaoBangRandomCauTraLoi();
204 LoadCauHoiVaoControl();
205 timer1.Start();
206
207 btPre.Enabled = false;
208 }
209 catch (Exception ex)
210 { MessageBox.Show(ex.Message); }
211 }
212
213 }
File name: frmThiThat.cs
Copy
215 private void btPre_Click(object sender, EventArgs e)
216 {
217 try
218 {
219 GhiLaiDapAnTS();
220 if (CauHienTai > 0)
221 {
222 GhiLaiDapAnTS();
223 btNext.Enabled = true;
224 checkBox1.Checked = false;
225 checkBox2.Checked = false;
226 checkBox3.Checked = false;
227 checkBox4.Checked = false;
228 CauHienTai--;
229 LoadCauHoiVaoControl();
230 }
231 if (CauHienTai == 0)
232 btPre.Enabled = false;
233 }
234 catch (Exception ex)
235 { MessageBox.Show(ex.Message); }
236 }
File name: frmThiThat.cs
Copy
238 private void btNext_Click(object sender, EventArgs e)
239 {
240 try
241 {
242 GhiLaiDapAnTS();
243 if (CauHienTai < SoCauHoi - 1)
244 {
245 GhiLaiDapAnTS();
246 btPre.Enabled = true;
247 checkBox1.Checked = false;
248 checkBox2.Checked = false;
249 checkBox3.Checked = false;
250 checkBox4.Checked = false;
251 CauHienTai++;
252 LoadCauHoiVaoControl();
253 }
254 if (CauHienTai == SoCauHoi - 1)
255 btNext.Enabled = false;
256 }
257 catch (Exception ex)
258 { MessageBox.Show(ex.Message); }
259 }
Download file with original file name:Exception
Exception 131 lượt xem
Gõ tìm kiếm nhanh...
Dự án liên quan!
Cách sửa bàn phím laptop bị liệt hiệu quả 170k
506 lượt xem
Java enum Constructor
482 lượt xem
Toán tử Spread JavaScript
750 lượt xem
LinQ.QLTV.designer.cs.dll
887 lượt xem
QLTV.designer.cs.dll
900 lượt xem