将DATAGRID一行值赋给数组时，这样的对空值的判断是否正确？如果不是，请问要如何判断？

DoHope 2004-06-07 03:13:01

private void DataGrid1_ItemCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
if(e.CommandName=="cmd_edit")
{
for (int i = 0;i< 9;i++)
{
TableCell cell_name;
cell_name = e.Item.Cells[i];
if(cell_name.Text==""||cell_name.Text==null) //判断是否正确？
{ cell_name.Text="abcd"; }
array_row.Add(cell_name.Text);
}

Server.Transfer("stock_master_input.aspx");
}
}

1、上面的if(cell_name.Text==""||cell_name.Text==null) 判断是否正确？不好用呀。
2、如果在上面的的步骤不加以判断，而直接存到数组里，那么在以后的程序里又如何来判断数组里某一元素为空？我这样写if(array1[1].ToString()==""||array1[1].ToString()==null)是否正确？？
3、stock_master_input.aspx的位置、弹出方式等，就像window.open()那样？

请高手指教此3个问题了，谢谢。

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雄蜂 2004-06-07

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if(Server.HtmlDecode(cell_name.Text)!=string.Empty)
" "是HTML中空格的编码，Server.HtmlDecode()方法将对HTML编码解码，Server.HtmlEncode()对字符进行HTML编码，如Server.HtmlEncode(" ")==" "。

DoHope 2004-06-07

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这样判断就是正确的“if(cell_name.Text.Trim()!=" ")

请问原因？

DoHope 2004-06-07

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if((cell_name.Text!=null)&&(cell_name.Text!=string.Empty))
array_row.Add(cell_name.Text);
else
array_row.Add("abcd");
不好用的，仍是空格，不是"abcd"

DoHope 2004-06-07

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谢各位了，试了。

雄蜂 2004-06-07

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问题1:
if((cell_name.Text!=null)&&(cell_name.Text!=string.Empty))
array_row.Add(cell_name.Text);
else
array_row.Add("abcd");
问题2：条件等式判断需用()，你的写法是错误的。
问题3：使用脚本window.open()或者showModalDialog();

jupiterII 2004-06-07

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其实用取每个tablecell的text的方法来取值,我个人觉得不大好.为什么不取里面的control,然后取control的text就不会有空格了( 就是一个空格)
server.transfer是没有办法实现你想要的那些的.

DoHope 2004-06-07

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to jupiterII() :

if(cell_name.Text.Trim()=="")的判断不好用的，存进去的仍然是空值，取出来就是了。
第3个问题我是说用Server.Transfer("stock_master_input.aspx");如何来定义stock_master_input.aspx的的位置、弹出方式等，就像window.open()那样？

jupiterII 2004-06-07

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1,if(cell_name.Text.Trim()=="")这样就可以了.
2,可以,一样,只需判断是否等于"".
3,不懂什么意思.

我想你对null的理解有点错误,建议去msdn里看一下.

Dim i, j, n As Integer Dim sql As String Private Declare Function GetKeyState Lib "user32" _ (ByVal nVirtKey As Long) As Integer Public je As Integer '记忆菜单上次数值，实现数据传送 Private Sub acg_Click() Call asPopup7_Click(False) End Sub Private Sub addcg_Click() Call asPopup6_Click(False) End Sub Private Sub addstudent_Click() Call asPopup2_Click(False) End Sub Private Sub asPopup1_Click(Cancel As Boolean) Grid1.Visible = True Grid2.Visible = False tkbase = "学生信息" fnumber = 13 sql = "select * from " & tkbase grid1pz '执行grid1的分配空间任务 datagrid '按要求读取数据空间 End Sub Private Sub grid1pz() Grid1.Cols = fnumber + 1 Grid1.Column(1).Width = 120 Grid1.Column(2).Width = 100 Grid1.Column(3).Width = 80 Grid1.Column(4).Width = 40 Grid1.Column(5).Width = 80 Grid1.Column(6).Width = 30 Grid1.Column(7).Width = 100 Grid1.Column(8).Width = 200 Grid1.Column(9).Width = 60 Grid1.Column(10).Width = 80 Grid1.Column(11).Width = 100 Grid1.Column(12).Width = 100 Grid1.Column(13).Width = 100 Grid1.Column(4).CellType = cellComboBox Grid1.ComboBox(4).Clear Grid1.ComboBox(4).AddItem "男" Grid1.ComboBox(4).AddItem "女" Grid1.Column(5).CellType = cellCalendar Grid1.Column(1).Locked = True End Sub Private Sub asPopup2_Click(Cancel As Boolean) Grid1.Visible = True Grid2.Visible = False tkbase = "学生信息" fnumber = 13 Set qy1 = cnn.Execute("select * from " & tkbase) grid1pz For i = 1 To fnumber Grid1.Cell(0, i).Text = qy1.Fields(i - 1).Name Next Grid1.Column(1).Locked = False Grid1.Rows = 1 Grid1.Rows = 21 gridsave = True '允许保存 griddelete = False '拒绝删除 gridedit = False End Sub Private Sub asPopup3_Click(Cancel As Boolean) Dim fo2 As CTranslucentForm Set fo2 = New CTranslucentForm fo2.hWnd = Form2.hWnd fo2.Alpha = 90 / 100 * 255 Me.WindowState = vbMinimized Load Form2 Form2.Show 1 End Sub Private Sub asPopup4_Click(Cancel As Boolean) Dim fo2 As CTranslucentForm Set fo2 = New CTranslucentForm fo2.hWnd = Form4.hWnd fo2.Alpha = 90 / 100 * 255 Me.WindowState = vbMinimized Load Form4 Form4.Show 1 End Sub Private Sub asPopup5_Click(Cancel As Boolean) MsgBox "非完整源码不可查询！" End Sub Private Sub asPopup6_Click(Cancel As Boolean) Grid1.Visible = False Grid2.Visible = True tkbase = "学生与课程" fnumber = 5 gridpz2 Set qy1 = cnn.Execute("select * from " & tkbase) For i = 1 To fnumber Grid2.Cell(0, i).Text = qy1.Fields(i - 1).Name Next Grid2.Rows = 1 Grid2.Rows = 21 gridsave = True gridedit = False griddel = False Grid2.Column(1).Locked = False Grid2.Column(2).Locked = False Grid2.Column(3).Locked = False End Sub Private Sub asPopup7_Click(Cancel As Boolean) Grid1.Visible = False Grid2.Visible = True tkbase = "学生与课程" fnumber = 5 sql = "select * from " & tkbase gridpz2 datagrid gridsave = False gridedit = True griddel = True Grid2.Column(1).Locked = True Grid2.Column(2).Locked = True Grid2.Column(3).Locked = True End Sub Private Sub gridpz2() Grid2.Cols = 7 Grid2.Column(1).CellType = cellComboBox Set qy1 = cnn.Execute("select 课程号 from 课程") Grid2.ComboBox(1).Clear Do While Not qy1.EOF Grid2.ComboBox(1).AddItem qy1.Fields(0) qy1.MoveNext Loop Grid2.Column(2).CellType = cellComboBox Set qy1 = cnn.Execute("select 课程名称 from 课程") Grid2.ComboBox(2).Clear Do While Not qy1.EOF Grid2.ComboBox(2).AddItem qy1.Fields(0) qy1.MoveNext Loop End Sub Private Sub asPopup9_Click(Cancel As Boolean) End End Sub Private Sub c1_Click(Index As Integer) '提交内容到函数执行，4为当前菜单（0-4），index是按钮数组名称 cmove 4, Index End Sub Private Sub cmove(s As Integer, i As Integer) '菜单智能移动函数代码 Dim j As Integer Dim X, Y, z, x1, y1 As Integer X = s Y = s z = s x1 = s j = 0 Do While s > 0 If je > i Then Do While X > i Do While Y >= X j = j + 360 Y = Y - 1 Loop c1(X).Top = Fre1.Height - j X = X - 1 Loop Else '-----------------向上代码 For X = 0 To i For Y = 0 To X j = j + 360 Next c1(X).Top = j - 360 j = 0 Next End If s = s - 1 For y1 = 0 To x1 If y1 = i Then Fre2(y1).Visible = True Fre2(y1).Top = c1(y1).Top + c1(y1).Height If y1 <> z Then Fre2(y1).Height = c1(y1 + 1).Top - Fre2(y1).Top Else Fre2(y1).Height = Fre1.Height - c1(y1).Top - c1(y1).Height End If Else Fre2(y1).Visible = False End If Next Loop je = i End Sub Private Sub cgdel_Click() Call XPButton6_Click End Sub Private Sub cgedit_Click() Call XPButton4_Click End Sub Private Sub delstudent_Click() Call XPButton6_Click End Sub Private Sub editstudent_Click() Call XPButton4_Click End Sub Private Sub findcg_Click() If hang = 0 Then Exit Sub End If Grid1.Visible = False Grid2.Visible = True tkbase = "学生与课程" fnumber = 5 sql = "select * from 学生与课程 where 学号='" & Grid1.Cell(hang, 1).Text & "'" gridpz2 datagrid gridsave = False gridedit = True griddel = True Grid2.Column(1).Locked = True Grid2.Column(2).Locked = True Grid2.Column(3).Locked = True End Sub Private Sub Grid1_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single) If Button = 2 Then PopupMenu student End If End Sub Private Sub Grid1_RowColChange(ByVal Row As Long, ByVal Col As Long) hang = Row If gridsave = True And Col = 5 Then '确认默认年龄在20岁左右 If Row <> 0 Then Grid1.Cell(Row, 5).Text = Date - 7300 End If End If End Sub Private Sub Grid1_Validate(Cancel As Boolean) '设定TAB键切换 Dim nActiveRow As Long, nActiveCol As Long Const VK_TAB = 9 If GetKeyState(VK_TAB) < 0 Then nActiveRow = Grid1.ActiveCell.Row nActiveCol = Grid1.ActiveCell.Col If nActiveCol < Grid1.Cols - 1 Then Grid1.Range(nActiveRow, nActiveCol + 1, _ nActiveRow, nActiveCol + 1).Selected End If Cancel = True End If End Sub Private Sub Form_Load() form1.BackColor = RGB(168, 217, 189) With Grid1 .AllowUserResizing = True .DisplayFocusRect = False .ExtendLastCol = True .Appearance = Flat .FixedRowColStyle = Flat .ScrollBarStyle = Flat .DefaultFont.Name = "Tahoma" .DefaultFont.Size = 8 .BackColorFixed = RGB(84, 201, 134) .BackColorFixedSel = RGB(84, 201, 134) .BackColorBkg = RGB(198, 229, 211) .BackColorScrollBar = RGB(198, 229, 211) .BackColor1 = RGB(231, 235, 247) .BackColor2 = RGB(198, 229, 211) .GridColor = RGB(148, 190, 231) .Column(0).Width = 0 End With With Grid2 .AllowUserResizing = True .DisplayFocusRect = False .ExtendLastCol = True .Appearance = Flat .FixedRowColStyle = Flat .ScrollBarStyle = Flat .AllowUserResizing = True .DisplayFocusRect = False .ExtendLastCol = True .Appearance = Flat .FixedRowColStyle = Flat .ScrollBarStyle = Flat .DefaultFont.Name = "Tahoma" .DefaultFont.Size = 8 .BackColorFixed = RGB(84, 201, 134) .BackColorFixedSel = RGB(84, 201, 134) .BackColorBkg = RGB(198, 229, 211) .BackColorScrollBar = RGB(198, 229, 211) .BackColor1 = RGB(231, 235, 247) .BackColor2 = RGB(198, 229, 211) .GridColor = RGB(148, 190, 231) .Column(0).Width = 0 End With je = 4 Dim fr As Integer Fre1.BackColor = RGB(168, 217, 189) For fr = 0 To 4 Fre2(fr).Visible = False Fre2(fr).BackColor = RGB(168, 217, 189) Next Grid2.Visible = False Call c1_Click(0) End Sub Private Sub Grid2_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single) If Button = 2 Then MsgBox "非完整源码不支持鼠标右键！" End If End Sub Private Sub Grid2_RowColChange(ByVal Row As Long, ByVal Col As Long) hang = Row End Sub Private Sub datagrid() griddelete = True '允许删除 gridedit = True If tkbase = "学生信息" Then If qy1.State = adStateOpen Then '表状态 qy1.Close End If qy1.Open sql, cnn, adOpenStatic, adLockReadOnly, adCmdText For i = 1 To fnumber Grid1.Cell(0, i).Text = qy1.Fields(i - 1).Name Next qy1.PageSize = 20 nnum = qy1.PageCount If qy1.PageCount = 0 Then nnum = 1 End If numpage = 1 Label1.Caption = "共" & nnum & "页第" & numpage & "页" Grid1.Rows = 1 Grid1.Rows = 21 If qy1.RecordCount = 0 Then Exit Sub End If qy1.AbsolutePage = numpage For i = 1 To qy1.PageSize '设定读取行 For j = 1 To fnumber '设定读取列 If qy1.EOF = True Then Exit Sub End If If qy1.Fields(j - 1) <> noNull Then '空值的处理 Grid1.Cell(i, j).Text = qy1.Fields(j - 1) Else Grid1.Cell(i, j).Text = "" End If Next If qy1.EOF = False Then qy1.MoveNext '读取下一记录 Else Exit Sub End If Next ElseIf tkbase = "学生与课程" Then If qy1.State = adStateOpen Then '表状态 qy1.Close End If qy1.Open sql, cnn, adOpenStatic, adLockReadOnly, adCmdText For i = 1 To fnumber Grid2.Cell(0, i).Text = qy1.Fields(i - 1).Name Next qy1.PageSize = 20 nnum = qy1.PageCount If qy1.PageCount = 0 Then nnum = 1 End If numpage = 1 Label1.Caption = "共" & nnum & "页第" & numpage & "页" Grid2.Rows = 1 Grid2.Rows = 21 If qy1.RecordCount = 0 Then Exit Sub End If qy1.AbsolutePage = numpage For i = 1 To qy1.PageSize '设定读取行 For j = 1 To fnumber '设定读取列 If qy1.EOF = True Then Exit Sub End If If qy1.Fields(j - 1) <> noNull Then '空值的处理 Grid2.Cell(i, j).Text = qy1.Fields(j - 1) Else Grid2.Cell(i, j).Text = "" End If Next If qy1.EOF = False Then qy1.MoveNext '读取下一记录 Else Exit Sub End If Next End If End Sub Private Sub Grid2_Validate(Cancel As Boolean) Dim nActiveRow As Long, nActiveCol As Long Const VK_TAB = 9 If GetKeyState(VK_TAB) < 0 Then nActiveRow = Grid1.ActiveCell.Row nActiveCol = Grid1.ActiveCell.Col If nActiveCol < Grid1.Cols - 1 Then Grid1.Range(nActiveRow, nActiveCol + 1, _ nActiveRow, nActiveCol + 1).Selected End If Cancel = True End If End Sub Private Sub renovate_Click() Call asPopup1_Click(False) End Sub Private Sub returncg_Click() Grid1.Visible = True Grid2.Visible = False End Sub Private Sub savestudent_Click() Call XPButton5_Click End Sub Private Sub XPButton1_Click() MsgBox "非完整源码只可显示20条记录！" End Sub Private Sub XPButton2_Click() MsgBox "非完整源码只可显示20条记录！" End Sub Private Sub XPButton4_Click() If gridedit = False Then MsgBox "当前修改操作不被允许!", vbInformation, "非使用对象" Exit Sub End If If hang = 0 Then Exit Sub End If Dim delok As String End Sub Private Sub XPButton5_Click() If tkbase = "" Then MsgBox "表指向不明，请确认", vbInformation, "提示" Exit Sub End If If gridsave = False Then MsgBox "当前不允许保存！", vbInformation, "提示" Exit Sub End If Select Case tkbase Case "学生信息" For i = 1 To 20 '处理重名数据 If Grid1.Cell(i, 1).Text <> "" Then Set qy1 = cnn.Execute("select 学号 from 学生信息 where 学号='" & Grid1.Cell(i, 1).Text & "'") If qy1.EOF = False Then MsgBox "第" & i & "行的学号在数据库里出现重复，请检查", vbInformation, "错误" Grid1.Cell(i, 1).SetFocus Exit Sub End If End If Next For i = 1 To 20 For n = 1 To fnumber Select Case n Case 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 If Grid1.Cell(i, 1).Text <> "" Then If Grid1.Cell(i, n).Text = "" Then MsgBox "第" & i & "行的--[" & Grid1.Cell(0, n).Text & "]--字段不允许为空!", vbInformation, "提示" Grid1.Cell(i, n).SetFocus Exit Sub End If End If End Select Next If Grid1.Cell(i, 1).Text <> "" Then sql = "insert into " & tkbase & " values('" For j = 1 To fnumber - 1 sql = sql & Grid1.Cell(i, j).Text & "','" Next sql = sql & Grid1.Cell(i, fnumber).Text & "')" Set qy1 = cnn.Execute(sql) End If Next MsgBox "命令执行完毕!", vbInformation, "完成" Grid1.Rows = 1 Grid1.Rows = 21 Case "学生与课程" MsgBox "非完整源码不可保证学生与课程的记录！" End Select gridsave = False griddelete = False '拒绝删除 gridedit = False End Sub Private Sub XPButton6_Click() If griddelete = False Then MsgBox "当前删除操作不被允许!", vbInformation, "非使用对象" Exit Sub End If If hang = 0 Then Exit Sub End If Dim delok As String Select Case tkbase Case "学生信息" MsgBox "非完整源码不可修改！" Case "学生与课程" If Grid2.Cell(hang, 1).Text = "" Then Exit Sub End If delok = MsgBox("确认删除" & Grid2.Cell(hang, 3).Text & "的<" & Grid2.Cell(hang, 2).Text & ">成绩吗？？", vbQuestion + vbOKCancel, "注意:此操作将会将学生资料与成绩资料完全清除") If delok = vbOK Then sql = "delete from " & tkbase & " where 学号='" & Grid2.Cell(hang, 3).Text & "' and 课程号='" & Grid2.Cell(hang, 1).Text & "'" Set qy1 = cnn.Execute(sql) MsgBox "目标己删除完成!", , "提示" End If End Select End Sub Private Sub XPButton8_Click(Index As Integer) Call findcg_Click End Sub

在dgv设计中总是遇到一行多余的空白行，需要增加很多判断来处理将AllowUserToAddRows属性设置为False，即可。

这是一套技术比较全面的EasyUI视频,由浅入深的几乎涵盖了所有EasyUI常用的组件,本课程后台Java端采用的是传统JDBC的技术,因为这套课程主要突出的是EasyUI的使用,所有后台这块技术大家可以忽略,只要有Java框架基础的同学,那后台是可以随意换的.本门课程的技术呢比较陈旧,视频中的有些杂音,如果你们公司用不着这个技术你就别学了,因为这技术确实已经挺老的了,可以学一些新的前端技术,例如BootStrap或者Vue,或者angularJS啦什么都可以.课程目标:1.熟练掌握EasyUI介绍和环境搭建2.熟练掌握Messager和window组件使用3.熟练掌握Dialog组件使用.4.熟练掌握表单验证,numberbox等组件使用5.熟练掌握layout布局组件6.熟练掌握datagrid组件增删改查详解7.熟练掌握可编辑表格Combo组件详解8.熟练掌握combo组件详解,省市县级联菜单9.熟练掌握tree组件详解,拖拽,增删改查

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